Goerli Testnet

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0x9086Acfdb7a8449EB58930FA362Fd691b2891360

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Transaction Hash
Method
Block
From
To
Value
Approve105694222024-02-20 20:00:1260 days ago1708459212IN
0x9086Acfd...1b2891360
0 ETH0.000072851.50000002
0x61014060105693972024-02-20 19:52:1260 days ago1708458732IN
 Create: FourOhFourStandard
0 ETH0.004626871.50000001

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105694552024-02-20 20:08:1260 days ago1708459692
0x9086Acfd...1b2891360
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105694552024-02-20 20:08:1260 days ago1708459692
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105694552024-02-20 20:08:1260 days ago1708459692
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105694442024-02-20 20:05:2460 days ago1708459524
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105694322024-02-20 20:02:3660 days ago1708459356
0x9086Acfd...1b2891360
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105694322024-02-20 20:02:3660 days ago1708459356
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105694322024-02-20 20:02:3660 days ago1708459356
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105693972024-02-20 19:52:1260 days ago1708458732
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105693972024-02-20 19:52:1260 days ago1708458732
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105693972024-02-20 19:52:1260 days ago1708458732
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105693972024-02-20 19:52:1260 days ago1708458732
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105693972024-02-20 19:52:1260 days ago1708458732
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105693972024-02-20 19:52:1260 days ago1708458732
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105693972024-02-20 19:52:1260 days ago1708458732
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105693972024-02-20 19:52:1260 days ago1708458732
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105693972024-02-20 19:52:1260 days ago1708458732
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105693972024-02-20 19:52:1260 days ago1708458732
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105693972024-02-20 19:52:1260 days ago1708458732
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105693972024-02-20 19:52:1260 days ago1708458732
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Contract Source Code Verified (Exact Match)

Contract Name:
FourOhFourStandard

Compiler Version
v0.8.24+commit.e11b9ed9

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion

Contract Source Code (Solidity Standard Json-Input format)

File 1 of 21 : FourOhFourStandard.sol
/**

β–ˆβ–ˆβ•—  β–ˆβ–ˆβ•— β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ•— β–ˆβ–ˆβ•—  β–ˆβ–ˆβ•—β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ•—β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ•— β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ•— β–ˆβ–ˆβ–ˆβ•—   β–ˆβ–ˆβ•—β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ•—  β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ•— β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ•— β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ•—     
β–ˆβ–ˆβ•‘  β–ˆβ–ˆβ•‘β–ˆβ–ˆβ•”β•β–ˆβ–ˆβ–ˆβ–ˆβ•—β–ˆβ–ˆβ•‘  β–ˆβ–ˆβ•‘β–ˆβ–ˆβ•”β•β•β•β•β•β•šβ•β•β–ˆβ–ˆβ•”β•β•β•β–ˆβ–ˆβ•”β•β•β–ˆβ–ˆβ•—β–ˆβ–ˆβ–ˆβ–ˆβ•—  β–ˆβ–ˆβ•‘β–ˆβ–ˆβ•”β•β•β–ˆβ–ˆβ•—β–ˆβ–ˆβ•”β•β•β–ˆβ–ˆβ•—β–ˆβ–ˆβ•”β•β•β–ˆβ–ˆβ•—β–ˆβ–ˆβ•”β•β•β–ˆβ–ˆβ•—    
β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ•‘β–ˆβ–ˆβ•‘β–ˆβ–ˆβ•”β–ˆβ–ˆβ•‘β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ•‘β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ•—   β–ˆβ–ˆβ•‘   β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ•‘β–ˆβ–ˆβ•”β–ˆβ–ˆβ•— β–ˆβ–ˆβ•‘β–ˆβ–ˆβ•‘  β–ˆβ–ˆβ•‘β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ•‘β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ•”β•β–ˆβ–ˆβ•‘  β–ˆβ–ˆβ•‘    
β•šβ•β•β•β•β–ˆβ–ˆβ•‘β–ˆβ–ˆβ–ˆβ–ˆβ•”β•β–ˆβ–ˆβ•‘β•šβ•β•β•β•β–ˆβ–ˆβ•‘β•šβ•β•β•β•β–ˆβ–ˆβ•‘   β–ˆβ–ˆβ•‘   β–ˆβ–ˆβ•”β•β•β–ˆβ–ˆβ•‘β–ˆβ–ˆβ•‘β•šβ–ˆβ–ˆβ•—β–ˆβ–ˆβ•‘β–ˆβ–ˆβ•‘  β–ˆβ–ˆβ•‘β–ˆβ–ˆβ•”β•β•β–ˆβ–ˆβ•‘β–ˆβ–ˆβ•”β•β•β–ˆβ–ˆβ•—β–ˆβ–ˆβ•‘  β–ˆβ–ˆβ•‘    
     β–ˆβ–ˆβ•‘β•šβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ•”β•     β–ˆβ–ˆβ•‘β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ•‘   β–ˆβ–ˆβ•‘   β–ˆβ–ˆβ•‘  β–ˆβ–ˆβ•‘β–ˆβ–ˆβ•‘ β•šβ–ˆβ–ˆβ–ˆβ–ˆβ•‘β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ•”β•β–ˆβ–ˆβ•‘  β–ˆβ–ˆβ•‘β–ˆβ–ˆβ•‘  β–ˆβ–ˆβ•‘β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ•”β•    
     β•šβ•β• β•šβ•β•β•β•β•β•      β•šβ•β•β•šβ•β•β•β•β•β•β•   β•šβ•β•   β•šβ•β•  β•šβ•β•β•šβ•β•  β•šβ•β•β•β•β•šβ•β•β•β•β•β• β•šβ•β•  β•šβ•β•β•šβ•β•  β•šβ•β•β•šβ•β•β•β•β•β•  

404 is a revolutionary web3 collaborative generative AI art experiment comprised of 
4,004 liquidity-backed NFT artworks, created by the community of holders in collaboration with AI.

https://404standard.com
https://t.me/official404standard
https://x.com/404_standard

*/

//SPDX-License-Identifier: MIT

pragma solidity ^0.8.20;

import {Ownable} from "@openzeppelin/contracts/access/Ownable.sol";
import {Strings} from "@openzeppelin/contracts/utils/Strings.sol";
import {ERC404} from "./ERC404.sol";
import {ERC404UniswapV3Exempt} from "./ERC404UniswapV3Exempt.sol";

contract FourOhFourStandard is Ownable, ERC404, ERC404UniswapV3Exempt {
    // string public dataURI = "https://404standard.com/nft/unrevealed.webp";
    string public dataURI = "https://picsum.photos/id/";
    string public baseTokenURI;

    // https://docs.uniswap.org/contracts/v3/reference/deployments
    address public uniswapSwapRouter_ = 0x68b3465833fb72A70ecDF485E0e4C7bD8665Fc45; // SwapRouter02
    address public uniswapV3NonfungiblePositionManager_ = 0xC36442b4a4522E871399CD717aBDD847Ab11FE88; // NonfungiblePositionManager

    constructor()
        ERC404("404test5", "404test5", 18)
        Ownable(msg.sender)
        ERC404UniswapV3Exempt(uniswapSwapRouter_, uniswapV3NonfungiblePositionManager_)
    {
        uint16 maxTotalSupplyERC721_ = 4004;

        _setERC721TransferExempt(msg.sender, true);
        _mintERC20(msg.sender, maxTotalSupplyERC721_ * units);
    }

    function setDataURI(string memory _dataURI) public onlyOwner {
        dataURI = _dataURI;
    }

    function setTokenURI(string memory _tokenURI) public onlyOwner {
        baseTokenURI = _tokenURI;
    }

    function tokenURI(uint256 _tokenId) public view override returns (string memory) {
        uint256 encodedId = _tokenId;
        
        if (_tokenId < ID_ENCODING_PREFIX) {
            // we are passing a normalId so the encoded ID is much larger
            encodedId += ID_ENCODING_PREFIX;
        } else {
            // if we are greater than the ID, get the unencoded ID
            _tokenId -= ID_ENCODING_PREFIX;
        }

        require(_tokenId <= minted && _tokenId >= 1, "ERC721Metadata: URI query for nonexistent token");

        string memory currentId = Strings.toString(_tokenId);

        if (bytes(baseTokenURI).length > 0) {
            return string.concat(baseTokenURI, currentId);
        } else {
            string memory image = string.concat(
                string.concat(dataURI, currentId),
                "/500/500"
            );

            string memory jsonData = string.concat(
                "data:application/json;utf8,",
                '{"name": "404Std #', currentId, '",',
                '"description": "A collection of 4,004 404s enabled by ERC404, an experimental token standard.",',
                // '"animation_url": "https://404standard.com/nft/unrevealed.mp4",',
                // '"external_url": "https://404standard.com",',
                // '"image": "', dataURI, '"}'
                '"image": "', image, '"}'
            );

            return jsonData;
        }
    }

    function setERC721TransferExempt(address account_, bool value_)
        external
        onlyOwner
    {
        _setERC721TransferExempt(account_, value_);
    }
}

File 3 of 21 : ERC404UniswapV3Exempt.sol
//SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

import {ERC404} from "./ERC404.sol";
import {IPeripheryImmutableState} from "@uniswap/v3-periphery/contracts/interfaces/IPeripheryImmutableState.sol";

abstract contract ERC404UniswapV3Exempt is ERC404 {
    error ERC404UniswapV3ExemptFactoryMismatch();
    error ERC404UniswapV3ExemptWETH9Mismatch();

    constructor(
        address uniswapV3Router_,
        address uniswapV3NonfungiblePositionManager_
    ) {
        IPeripheryImmutableState uniswapV3Router = IPeripheryImmutableState(
            uniswapV3Router_
        );

        // Set the Uniswap v3 swap router as exempt.
        _setERC721TransferExempt(uniswapV3Router_, true);

        IPeripheryImmutableState uniswapV3NonfungiblePositionManager = IPeripheryImmutableState(
                uniswapV3NonfungiblePositionManager_
            );

        // Set the Uniswap v3 nonfungible position manager as exempt.
        _setERC721TransferExempt(uniswapV3NonfungiblePositionManager_, true);

        // Require the Uniswap v3 factory from the position manager and the swap router to be the same.
        if (uniswapV3Router.factory() != uniswapV3NonfungiblePositionManager.factory()) {
            revert ERC404UniswapV3ExemptFactoryMismatch();
        }

        // Require the Uniswap v3 WETH9 from the position manager and the swap router to be the same.
        if (uniswapV3Router.WETH9() != uniswapV3NonfungiblePositionManager.WETH9()) {
            revert ERC404UniswapV3ExemptWETH9Mismatch();
        }

        uint24[4] memory feeTiers = [
            uint24(100),
            uint24(500),
            uint24(3_000),
            uint24(10_000)
        ];

        // Determine the Uniswap v3 pair address for this token.
        for (uint256 i = 0; i < feeTiers.length; ) {
            address uniswapV3Pair = _getUniswapV3Pair(
                uniswapV3Router.factory(),
                uniswapV3Router.WETH9(),
                feeTiers[i]
            );

            // Set the Uniswap v3 pair as exempt.
            _setERC721TransferExempt(uniswapV3Pair, true);

            unchecked {
                ++i;
            }
        }
    }

    function _getUniswapV3Pair(
        address uniswapV3Factory_,
        address weth_,
        uint24 fee_
    ) private view returns (address) {
        address thisAddress = address(this);

        (address token0, address token1) = thisAddress < weth_
            ? (thisAddress, weth_)
            : (weth_, thisAddress);

        return
            address(
                uint160(
                    uint256(
                        keccak256(
                            abi.encodePacked(
                                hex"ff",
                                uniswapV3Factory_,
                                keccak256(abi.encode(token0, token1, fee_)),
                                hex"e34f199b19b2b4f47f68442619d555527d244f78a3297ea89325f843f87b8b54"
                            )
                        )
                    )
                )
            );
    }
}

File 4 of 21 : ERC404.sol
//SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

import {IERC721Receiver} from "@openzeppelin/contracts/interfaces/IERC721Receiver.sol";
import {IERC721} from "@openzeppelin/contracts/interfaces/IERC721.sol";
import {IERC721Metadata} from "@openzeppelin/contracts/interfaces/IERC721Metadata.sol";
import {IERC165} from "@openzeppelin/contracts/interfaces/IERC165.sol";
import {IERC404} from "./interfaces/IERC404.sol";
import {PackedDoubleEndedQueue} from "./PackedDoubleEndedQueue.sol";
import {ERC721Events} from "./lib/ERC721Events.sol";
import {ERC20Events} from "./lib/ERC20Events.sol";

abstract contract ERC404 is IERC404 {
    event ERC721Exempt(address indexed exemptedAddress);

    event ERC721Unexempt(address indexed unexemptedAddress);

    using PackedDoubleEndedQueue for PackedDoubleEndedQueue.Uint16Deque;

    /// @dev The queue of ERC-721 tokens stored in the contract.
    PackedDoubleEndedQueue.Uint16Deque private _storedERC721Ids;

    /// @dev Token name
    string public name;

    /// @dev Token symbol
    string public symbol;

    /// @dev Decimals for ERC-20 representation
    uint8 public immutable decimals;

    /// @dev Units for ERC-20 representation
    uint256 public immutable units;

    /// @dev Total supply in ERC-20 representation
    uint256 public totalSupply;

    /// @dev Current mint counter which also represents the highest
    ///      minted id, monotonically increasing to ensure accurate ownership
    uint256 public minted;

    /// @dev Initial chain id for EIP-2612 support
    uint256 internal immutable _INITIAL_CHAIN_ID;

    /// @dev Initial domain separator for EIP-2612 support
    bytes32 internal immutable _INITIAL_DOMAIN_SEPARATOR;

    /// @dev Balance of user in ERC-20 representation
    mapping(address => uint256) public balanceOf;

    /// @dev Allowance of user in ERC-20 representation
    mapping(address => mapping(address => uint256)) public allowance;

    /// @dev Approval in ERC-721 representaion
    mapping(uint256 => address) public getApproved;

    /// @dev Approval for all in ERC-721 representation
    mapping(address => mapping(address => bool)) public isApprovedForAll;

    /// @dev Packed representation of ownerOf and owned indices
    mapping(uint256 => uint256) internal _ownedData;

    /// @dev Array of owned ids in ERC-721 representation
    mapping(address => uint16[]) internal _owned;

    /// @dev Addresses that are exempt from ERC-721 transfer, typically for gas savings (pairs, routers, etc)
    mapping(address => bool) internal _erc721TransferExempt;

    /// @dev EIP-2612 nonces
    mapping(address => uint256) public nonces;

    /// @dev Address bitmask for packed ownership data
    uint256 private constant _BITMASK_ADDRESS = (1 << 160) - 1;

    /// @dev Owned index bitmask for packed ownership data
    uint256 private constant _BITMASK_OWNED_INDEX = ((1 << 96) - 1) << 160;

    /// @dev Constant for token id encoding
    uint256 public constant ID_ENCODING_PREFIX = 1 << 255;

    constructor(string memory name_, string memory symbol_, uint8 decimals_) {
        name = name_;
        symbol = symbol_;

        if (decimals_ < 18) {
            revert DecimalsTooLow();
        }

        decimals = decimals_;
        units = 10 ** decimals;

        // EIP-2612 initialization
        _INITIAL_CHAIN_ID = block.chainid;
        _INITIAL_DOMAIN_SEPARATOR = _computeDomainSeparator();
    }

    /// @notice Function to find owner of a given ERC-721 token
    function ownerOf(
        uint256 id_
    ) public view virtual returns (address erc721Owner) {
        erc721Owner = _getOwnerOf(id_);

        if (!_isValidTokenId(id_)) {
            revert InvalidTokenId();
        }

        if (erc721Owner == address(0)) {
            revert NotFound();
        }
    }

    function owned(
        address owner_
    ) public view virtual returns (uint256[] memory) {
        uint256[] memory ownedAsU256 = new uint256[](_owned[owner_].length);

        for (uint256 i = 0; i < _owned[owner_].length; ) {
            ownedAsU256[i] = ID_ENCODING_PREFIX + _owned[owner_][i];

            unchecked {
                ++i;
            }
        }

        return ownedAsU256;
    }

    function erc721BalanceOf(
        address owner_
    ) public view virtual returns (uint256) {
        return _owned[owner_].length;
    }

    function erc20BalanceOf(
        address owner_
    ) public view virtual returns (uint256) {
        return balanceOf[owner_];
    }

    function erc20TotalSupply() public view virtual returns (uint256) {
        return totalSupply;
    }

    function erc721TotalSupply() public view virtual returns (uint256) {
        return minted;
    }

    function getERC721QueueLength() public view virtual returns (uint256) {
        return _storedERC721Ids.length();
    }

    function getERC721TokensInQueue(
        uint256 start_,
        uint256 count_
    ) public view virtual returns (uint256[] memory) {
        uint256[] memory tokensInQueue = new uint256[](count_);

        for (uint256 i = start_; i < start_ + count_; ) {
            tokensInQueue[i - start_] =
                ID_ENCODING_PREFIX +
                _storedERC721Ids.at(i);

            unchecked {
                ++i;
            }
        }

        return tokensInQueue;
    }

    /// @notice tokenURI must be implemented by child contract
    function tokenURI(uint256 id_) public view virtual returns (string memory);

    /// @dev This function assumes the operator is attempting to approve
    ///      an ERC-721 if valueOrId_ is a possibly valid ERC-721 token id.
    ///      Unlike setApprovalForAll, spender_ must be allowed to be 0x0 so
    ///      that approval can be revoked.
    function approve(
        address spender_,
        uint256 valueOrId_
    ) public virtual returns (bool) {
        if (_isValidTokenId(valueOrId_)) {
            erc721Approve(spender_, valueOrId_);
        } else {
            return erc20Approve(spender_, valueOrId_);
        }

        return true;
    }

    function erc721Approve(address spender_, uint256 id_) public virtual {
        // Intention is to approve as ERC-721 token (id).
        address erc721Owner = _getOwnerOf(id_);

        if (
            msg.sender != erc721Owner &&
            !isApprovedForAll[erc721Owner][msg.sender]
        ) {
            revert Unauthorized();
        }

        getApproved[id_] = spender_;

        emit ERC721Approval(erc721Owner, spender_, id_);
        emit ERC721Events.Approval(erc721Owner, spender_, id_);
    }

    /// @dev Providing type(uint256).max for approval value results in an
    ///      unlimited approval that is not deducted from on transfers.
    function erc20Approve(
        address spender_,
        uint256 value_
    ) public virtual returns (bool) {
        // Prevent granting 0x0 an ERC-20 allowance.
        if (spender_ == address(0)) {
            revert InvalidSpender();
        }

        // Intention is to approve as ERC-20 token (value).
        allowance[msg.sender][spender_] = value_;

        emit ERC20Approval(msg.sender, spender_, value_);
        emit ERC20Events.Approval(msg.sender, spender_, value_);

        return true;
    }

    /// @notice Function for ERC-721 approvals
    function setApprovalForAll(
        address operator_,
        bool approved_
    ) public virtual {
        // Prevent approvals to 0x0.
        if (operator_ == address(0)) {
            revert InvalidOperator();
        }
        isApprovedForAll[msg.sender][operator_] = approved_;
        emit ERC721Events.ApprovalForAll(msg.sender, operator_, approved_);
    }

    /// @notice Function for mixed transfers from an operator that may be different than 'from'.
    /// @dev This function assumes the operator is attempting to transfer an ERC-721
    ///      if valueOrId is a possible valid token id.
    function transferFrom(
        address from_,
        address to_,
        uint256 valueOrId_
    ) public virtual returns (bool) {
        if (_isValidTokenId(valueOrId_)) {
            erc721TransferFrom(from_, to_, valueOrId_);
        } else {
            // Intention is to transfer as ERC-20 token (value).
            return erc20TransferFrom(from_, to_, valueOrId_);
        }

        return true;
    }

    /// @notice Function for ERC-721 transfers from.
    /// @dev This function is recommended for ERC721 transfers.
    function erc721TransferFrom(
        address from_,
        address to_,
        uint256 id_
    ) public virtual {
        // Prevent minting tokens from 0x0.
        if (from_ == address(0)) {
            revert InvalidSender();
        }

        // Prevent burning tokens to 0x0.
        if (to_ == address(0)) {
            revert InvalidRecipient();
        }

        if (from_ != _getOwnerOf(id_)) {
            revert Unauthorized();
        }

        // Check that the operator is either the sender or approved for the transfer.
        if (
            msg.sender != from_ &&
            !isApprovedForAll[from_][msg.sender] &&
            msg.sender != getApproved[id_]
        ) {
            revert Unauthorized();
        }

        // We only need to check ERC-721 transfer exempt status for the recipient 
        // since the sender being ERC-721 transfer exempt means they have already 
        // had their ERC-721s stripped away during the rebalancing process.
        if (erc721TransferExempt(to_)) {
            revert RecipientIsERC721TransferExempt();
        }

        // Transfer 1 * units ERC-20 and 1 ERC-721 token.
        // ERC-721 transfer exemptions handled above. Can't make it to this point if either is transfer exempt.
        _transferERC20(from_, to_, units);
        _transferERC721(from_, to_, id_);
    }

    /// @notice Function for ERC-20 transfers from.
    /// @dev This function is recommended for ERC20 transfers
    function erc20TransferFrom(
        address from_,
        address to_,
        uint256 value_
    ) public virtual returns (bool) {
        // Prevent minting tokens from 0x0.
        if (from_ == address(0)) {
            revert InvalidSender();
        }

        // Prevent burning tokens to 0x0.
        if (to_ == address(0)) {
            revert InvalidRecipient();
        }

        // Intention is to transfer as ERC-20 token (value).
        uint256 allowed = allowance[from_][msg.sender];

        // Check that the operator has sufficient allowance.
        if (allowed != type(uint256).max) {
            allowance[from_][msg.sender] = allowed - value_;
        }

        // Transferring ERC-20s directly requires the _transferERC20WithERC721 function.
        // Handles ERC-721 exemptions internally.
        return _transferERC20WithERC721(from_, to_, value_);
    }

    /// @notice Function for ERC-20 transfers.
    /// @dev This function assumes the operator is attempting to transfer as ERC-20
    ///      given this function is only supported on the ERC-20 interface.
    ///      Treats even small amounts that are valid ERC-721 ids as ERC-20s.
    function transfer(
        address to_,
        uint256 value_
    ) public virtual returns (bool) {
        // Prevent burning tokens to 0x0.
        if (to_ == address(0)) {
            revert InvalidRecipient();
        }

        // Transferring ERC-20s directly requires the _transferERC20WithERC721 function.
        // Handles ERC-721 exemptions internally.
        return _transferERC20WithERC721(msg.sender, to_, value_);
    }

    /// @notice Function for ERC-721 transfers with contract support.
    /// This function only supports moving valid ERC-721 ids, as it does not exist on the ERC-20
    /// spec and will revert otherwise.
    function safeTransferFrom(
        address from_,
        address to_,
        uint256 id_
    ) public virtual {
        safeTransferFrom(from_, to_, id_, "");
    }

    /// @notice Function for ERC-721 transfers with contract support and callback data.
    /// This function only supports moving valid ERC-721 ids, as it does not exist on the
    /// ERC-20 spec and will revert otherwise.
    function safeTransferFrom(
        address from_,
        address to_,
        uint256 id_,
        bytes memory data_
    ) public virtual {
        if (!_isValidTokenId(id_)) {
            revert InvalidTokenId();
        }

        transferFrom(from_, to_, id_);

        if (
            to_.code.length != 0 &&
            IERC721Receiver(to_).onERC721Received(
                msg.sender,
                from_,
                id_,
                data_
            ) !=
            IERC721Receiver.onERC721Received.selector
        ) {
            revert UnsafeRecipient();
        }
    }

    /// @notice Function for EIP-2612 permits (ERC-20 only)
    /// @dev Providing type(uint256).max for permit value results in an
    ///      unlimited approval that is not deducted from on transfers.
    function permit(
        address owner_,
        address spender_,
        uint256 value_,
        uint256 deadline_,
        uint8 v_,
        bytes32 r_,
        bytes32 s_
    ) public virtual {
        if (deadline_ < block.timestamp) {
            revert PermitDeadlineExpired();
        }

        // permit cannot be used for ERC-721 token approvals, so ensure
        // the value does not fall within the valid range of ERC-721 token ids.
        if (_isValidTokenId(value_)) {
            revert InvalidApproval();
        }

        if (spender_ == address(0)) {
            revert InvalidSpender();
        }

        unchecked {
            address recoveredAddress = ecrecover(
                keccak256(
                    abi.encodePacked(
                        "\x19\x01",
                        DOMAIN_SEPARATOR(),
                        keccak256(
                            abi.encode(
                                keccak256(
                                    "Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)"
                                ),
                                owner_,
                                spender_,
                                value_,
                                nonces[owner_]++,
                                deadline_
                            )
                        )
                    )
                ),
                v_,
                r_,
                s_
            );

            if (recoveredAddress == address(0) || recoveredAddress != owner_) {
                revert InvalidSigner();
            }

            allowance[recoveredAddress][spender_] = value_;
        }

        emit ERC20Approval(owner_, spender_, value_);
        emit ERC20Events.Approval(owner_, spender_, value_);
    }

    /// @notice Returns domain initial domain separator, or recomputes if chain id is not equal to initial chain id
    function DOMAIN_SEPARATOR() public view virtual returns (bytes32) {
        return
            block.chainid == _INITIAL_CHAIN_ID
                ? _INITIAL_DOMAIN_SEPARATOR
                : _computeDomainSeparator();
    }

    function supportsInterface(
        bytes4 interfaceId
    ) public view virtual returns (bool) {
        return
            interfaceId == type(IERC404).interfaceId ||
            interfaceId == type(IERC165).interfaceId ||
            interfaceId == type(IERC721).interfaceId ||
            interfaceId == type(IERC721Metadata).interfaceId;
    }

    /// @notice Function for self-exemption
    function setSelfERC721TransferExempt(bool state_) public virtual {
        _setERC721TransferExempt(msg.sender, state_);
    }

    /// @notice Function to check if address is transfer exempt
    function erc721TransferExempt(
        address target_
    ) public view virtual returns (bool) {
        return target_ == address(0) || _erc721TransferExempt[target_];
    }

    /// @notice For a token token id to be considered valid, it just needs
    ///         to fall within the range of possible token ids, it does not
    ///         necessarily have to be minted yet.
    function _isValidTokenId(uint256 id_) internal pure returns (bool) {
        return id_ > ID_ENCODING_PREFIX && id_ != type(uint256).max;
    }

    /// @notice Internal function to compute domain separator for EIP-2612 permits
    function _computeDomainSeparator() internal view virtual returns (bytes32) {
        return
            keccak256(
                abi.encode(
                    keccak256(
                        "EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"
                    ),
                    keccak256(bytes(name)),
                    keccak256("1"),
                    block.chainid,
                    address(this)
                )
            );
    }

    /// @notice This is the lowest level ERC-20 transfer function, which
    ///         should be used for both normal ERC-20 transfers as well as minting.
    /// Note that this function allows transfers to and from 0x0.
    function _transferERC20(
        address from_,
        address to_,
        uint256 value_
    ) internal virtual {
        // Minting is a special case for which we should not check the balance of
        // the sender, and we should increase the total supply.
        if (from_ == address(0)) {
            totalSupply += value_;
        } else {
            // Deduct value from sender's balance.
            balanceOf[from_] -= value_;
        }

        // Update the recipient's balance.
        // Can be unchecked because on mint, adding to totalSupply is checked, and on transfer balance deduction is checked.
        unchecked {
            balanceOf[to_] += value_;
        }

        emit ERC20Transfer(from_, to_, value_);
        emit ERC20Events.Transfer(from_, to_, value_);
    }

    /// @notice Consolidated record keeping function for transferring ERC-721s.
    /// @dev Assign the token to the new owner, and remove from the old owner.
    /// Note that this function allows transfers to and from 0x0.
    /// Does not handle ERC-721 exemptions.
    function _transferERC721(
        address from_,
        address to_,
        uint256 id_
    ) internal virtual {
        // If this is not a mint, handle record keeping for transfer from previous owner.
        if (from_ != address(0)) {
            // On transfer of an NFT, any previous approval is reset.
            delete getApproved[id_];

            uint256 updatedId = ID_ENCODING_PREFIX +
                _owned[from_][_owned[from_].length - 1];
            if (updatedId != id_) {
                uint256 updatedIndex = _getOwnedIndex(id_);
                // update _owned for sender
                _owned[from_][updatedIndex] = uint16(updatedId);
                // update index for the moved id
                _setOwnedIndex(updatedId, updatedIndex);
            }

            // pop
            _owned[from_].pop();
        }

        // Check if this is a burn.
        if (to_ != address(0)) {
            // If not a burn, update the owner of the token to the new owner.
            // Update owner of the token to the new owner.
            _setOwnerOf(id_, to_);
            // Push token onto the new owner's stack.
            _owned[to_].push(uint16(id_));
            // Update index for new owner's stack.
            _setOwnedIndex(id_, _owned[to_].length - 1);
        } else {
            // If this is a burn, reset the owner of the token to 0x0 by deleting the token from _ownedData.
            delete _ownedData[id_];
        }

        emit ERC721Transfer(from_, to_, id_);
        emit ERC721Events.Transfer(from_, to_, id_);
    }

    /// @notice Internal function for ERC-20 transfers. Also handles any ERC-721 transfers that may be required.
    // Handles ERC-721 exemptions.
    function _transferERC20WithERC721(
        address from_,
        address to_,
        uint256 value_
    ) internal virtual returns (bool) {
        uint256 erc20BalanceOfSenderBefore = erc20BalanceOf(from_);
        uint256 erc20BalanceOfReceiverBefore = erc20BalanceOf(to_);

        _transferERC20(from_, to_, value_);

        // Preload for gas savings on branches
        bool isFromERC721TransferExempt = erc721TransferExempt(from_);
        bool isToERC721TransferExempt = erc721TransferExempt(to_);

        // Skip _withdrawAndStoreERC721 and/or _retrieveOrMintERC721 for ERC-721 transfer exempt addresses
        // 1) to save gas
        // 2) because ERC-721 transfer exempt addresses won't always have/need ERC-721s corresponding to their ERC20s.
        if (isFromERC721TransferExempt && isToERC721TransferExempt) {
            // Case 1) Both sender and recipient are ERC-721 transfer exempt. No ERC-721s need to be transferred.
            // NOOP.
        } else if (isFromERC721TransferExempt) {
            // Case 2) The sender is ERC-721 transfer exempt, but the recipient is not. Contract should not attempt
            //         to transfer ERC-721s from the sender, but the recipient should receive ERC-721s
            //         from the bank/minted for any whole number increase in their balance.
            // Only cares about whole number increments.
            uint256 tokensToRetrieveOrMint = (balanceOf[to_] / units) -
                (erc20BalanceOfReceiverBefore / units);
            for (uint256 i = 0; i < tokensToRetrieveOrMint; ) {
                _retrieveOrMintERC721(to_);
                unchecked {
                    ++i;
                }
            }
        } else if (isToERC721TransferExempt) {
            // Case 3) The sender is not ERC-721 transfer exempt, but the recipient is. Contract should attempt
            //         to withdraw and store ERC-721s from the sender, but the recipient should not
            //         receive ERC-721s from the bank/minted.
            // Only cares about whole number increments.
            uint256 tokensToWithdrawAndStore = (erc20BalanceOfSenderBefore /
                units) - (balanceOf[from_] / units);
            for (uint256 i = 0; i < tokensToWithdrawAndStore; ) {
                _withdrawAndStoreERC721(from_);
                unchecked {
                    ++i;
                }
            }
        } else {
            // Case 4) Neither the sender nor the recipient are ERC-721 transfer exempt.
            // Strategy:
            // 1. First deal with the whole tokens. These are easy and will just be transferred.
            // 2. Look at the fractional part of the value:
            //   a) If it causes the sender to lose a whole token that was represented by an NFT due to a
            //      fractional part being transferred, withdraw and store an additional NFT from the sender.
            //   b) If it causes the receiver to gain a whole new token that should be represented by an NFT
            //      due to receiving a fractional part that completes a whole token, retrieve or mint an NFT to the recevier.

            // Whole tokens worth of ERC-20s get transferred as ERC-721s without any burning/minting.
            uint256 nftsToTransfer = value_ / units;
            for (uint256 i = 0; i < nftsToTransfer; ) {
                // Pop from sender's ERC-721 stack and transfer them (LIFO)
                uint256 indexOfLastToken = _owned[from_].length - 1;
                uint256 tokenId = ID_ENCODING_PREFIX +
                    _owned[from_][indexOfLastToken];
                _transferERC721(from_, to_, tokenId);
                unchecked {
                    ++i;
                }
            }

            // If the transfer changes either the sender or the recipient's holdings from a fractional to a non-fractional
            // amount (or vice versa), adjust ERC-721s.

            // First check if the send causes the sender to lose a whole token that was represented by an ERC-721
            // due to a fractional part being transferred.
            //
            // Process:
            // Take the difference between the whole number of tokens before and after the transfer for the sender.
            // If that difference is greater than the number of ERC-721s transferred (whole units), then there was
            // an additional ERC-721 lost due to the fractional portion of the transfer.
            // If this is a self-send and the before and after balances are equal (not always the case but often),
            // then no ERC-721s will be lost here.
            if (
                erc20BalanceOfSenderBefore /
                    units -
                    erc20BalanceOf(from_) /
                    units >
                nftsToTransfer
            ) {
                _withdrawAndStoreERC721(from_);
            }

            // Then, check if the transfer causes the receiver to gain a whole new token which requires gaining
            // an additional ERC-721.
            //
            // Process:
            // Take the difference between the whole number of tokens before and after the transfer for the recipient.
            // If that difference is greater than the number of ERC-721s transferred (whole units), then there was
            // an additional ERC-721 gained due to the fractional portion of the transfer.
            // Again, for self-sends where the before and after balances are equal, no ERC-721s will be gained here.
            if (
                erc20BalanceOf(to_) /
                    units -
                    erc20BalanceOfReceiverBefore /
                    units >
                nftsToTransfer
            ) {
                _retrieveOrMintERC721(to_);
            }
        }

        return true;
    }

    /// @notice Internal function for ERC20 minting
    /// @dev This function will allow minting of new ERC20s.
    ///      If mintCorrespondingERC721s_ is true, and the recipient is not ERC-721 exempt, it will
    ///      also mint the corresponding ERC721s.
    /// Handles ERC-721 exemptions.
    function _mintERC20(address to_, uint256 value_) internal virtual {
        /// You cannot mint to the zero address (you can't mint and immediately burn in the same transfer).
        if (to_ == address(0)) {
            revert InvalidRecipient();
        }

        if (totalSupply + value_ > ID_ENCODING_PREFIX) {
            revert MintLimitReached();
        }

        _transferERC20WithERC721(address(0), to_, value_);
    }

    /// @notice Internal function for ERC-721 minting and retrieval from the bank.
    /// @dev This function will allow minting of new ERC-721s up to the total fractional supply. It will
    ///      first try to pull from the bank, and if the bank is empty, it will mint a new token.
    /// Does not handle ERC-721 exemptions.
    function _retrieveOrMintERC721(address to_) internal virtual {
        if (to_ == address(0)) {
            revert InvalidRecipient();
        }

        uint256 id;

        if (!_storedERC721Ids.empty()) {
            // If there are any tokens in the bank, use those first.
            // Pop off the end of the queue (FIFO).
            id = ID_ENCODING_PREFIX + _storedERC721Ids.popBack();
        } else {
            // Otherwise, mint a new token, should not be able to go over the total fractional supply.
            ++minted;

            // Reserve max uint256 for approvals
            if (minted == type(uint256).max) {
                revert MintLimitReached();
            }

            id = ID_ENCODING_PREFIX + minted;
        }

        address erc721Owner = _getOwnerOf(id);

        // The token should not already belong to anyone besides 0x0 or this contract.
        // If it does, something is wrong, as this should never happen.
        if (erc721Owner != address(0)) {
            revert AlreadyExists();
        }

        // Transfer the token to the recipient, either transferring from the contract's bank or minting.
        // Does not handle ERC-721 exemptions.
        _transferERC721(erc721Owner, to_, id);
    }

    /// @notice Internal function for ERC-721 deposits to bank (this contract).
    /// @dev This function will allow depositing of ERC-721s to the bank, which can be retrieved by future minters.
    // Does not handle ERC-721 exemptions.
    function _withdrawAndStoreERC721(address from_) internal virtual {
        if (from_ == address(0)) {
            revert InvalidSender();
        }

        // Retrieve the latest token added to the owner's stack (LIFO).
        uint256 id = ID_ENCODING_PREFIX +
            _owned[from_][_owned[from_].length - 1];

        // Transfer to 0x0.
        // Does not handle ERC-721 exemptions.
        _transferERC721(from_, address(0), id);

        // Record the token in the contract's bank queue.
        _storedERC721Ids.pushFront(uint16(id));
    }

    /// @notice Initialization function to set pairs / etc, saving gas by avoiding mint / burn on unnecessary targets
    function _setERC721TransferExempt(
        address target_,
        bool state_
    ) internal virtual {
        if (target_ == address(0)) {
            revert InvalidExemption();
        }

        // Adjust the ERC721 balances of the target to respect exemption rules.
        // Despite this logic, it is still recommended practice to exempt prior to the target
        // having an active balance.
        if (state_) {
            _clearERC721Balance(target_);
        } else {
            _reinstateERC721Balance(target_);
        }

        _erc721TransferExempt[target_] = state_;
    }

    /// @notice Function to reinstate balance on exemption removal
    function _reinstateERC721Balance(address target_) private {
        uint256 expectedERC721Balance = erc20BalanceOf(target_) / units;
        uint256 actualERC721Balance = erc721BalanceOf(target_);

        for (uint256 i = 0; i < expectedERC721Balance - actualERC721Balance; ) {
            // Transfer ERC721 balance in from pool
            _retrieveOrMintERC721(target_);
            unchecked {
                ++i;
            }
        }

        emit ERC721Unexempt(target_);
    }

    /// @notice Function to clear balance on exemption inclusion
    function _clearERC721Balance(address target_) private {
        uint256 erc721Balance = erc721BalanceOf(target_);

        for (uint256 i = 0; i < erc721Balance; ) {
            // Transfer out ERC721 balance
            _withdrawAndStoreERC721(target_);
            unchecked {
                ++i;
            }
        }

        emit ERC721Exempt(target_);
    }

    function _getOwnerOf(
        uint256 id_
    ) internal view virtual returns (address ownerOf_) {
        uint256 data = _ownedData[id_];

        assembly {
            ownerOf_ := and(data, _BITMASK_ADDRESS)
        }
    }

    function _setOwnerOf(uint256 id_, address owner_) internal virtual {
        uint256 data = _ownedData[id_];

        assembly {
            data := add(
                and(data, _BITMASK_OWNED_INDEX),
                and(owner_, _BITMASK_ADDRESS)
            )
        }

        _ownedData[id_] = data;
    }

    function _getOwnedIndex(
        uint256 id_
    ) internal view virtual returns (uint256 ownedIndex_) {
        uint256 data = _ownedData[id_];

        assembly {
            ownedIndex_ := shr(160, data)
        }
    }

    function _setOwnedIndex(uint256 id_, uint256 index_) internal virtual {
        uint256 data = _ownedData[id_];

        if (index_ > _BITMASK_OWNED_INDEX >> 160) {
            revert OwnedIndexOverflow();
        }

        assembly {
            data := add(
                and(data, _BITMASK_ADDRESS),
                and(shl(160, index_), _BITMASK_OWNED_INDEX)
            )
        }

        _ownedData[id_] = data;
    }
}

File 5 of 21 : Strings.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (utils/Strings.sol)

pragma solidity ^0.8.20;

import {Math} from "./math/Math.sol";
import {SignedMath} from "./math/SignedMath.sol";

/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant HEX_DIGITS = "0123456789abcdef";
    uint8 private constant ADDRESS_LENGTH = 20;

    /**
     * @dev The `value` string doesn't fit in the specified `length`.
     */
    error StringsInsufficientHexLength(uint256 value, uint256 length);

    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        unchecked {
            uint256 length = Math.log10(value) + 1;
            string memory buffer = new string(length);
            uint256 ptr;
            /// @solidity memory-safe-assembly
            assembly {
                ptr := add(buffer, add(32, length))
            }
            while (true) {
                ptr--;
                /// @solidity memory-safe-assembly
                assembly {
                    mstore8(ptr, byte(mod(value, 10), HEX_DIGITS))
                }
                value /= 10;
                if (value == 0) break;
            }
            return buffer;
        }
    }

    /**
     * @dev Converts a `int256` to its ASCII `string` decimal representation.
     */
    function toStringSigned(int256 value) internal pure returns (string memory) {
        return string.concat(value < 0 ? "-" : "", toString(SignedMath.abs(value)));
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        unchecked {
            return toHexString(value, Math.log256(value) + 1);
        }
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
     */
    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
        uint256 localValue = value;
        bytes memory buffer = new bytes(2 * length + 2);
        buffer[0] = "0";
        buffer[1] = "x";
        for (uint256 i = 2 * length + 1; i > 1; --i) {
            buffer[i] = HEX_DIGITS[localValue & 0xf];
            localValue >>= 4;
        }
        if (localValue != 0) {
            revert StringsInsufficientHexLength(value, length);
        }
        return string(buffer);
    }

    /**
     * @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal
     * representation.
     */
    function toHexString(address addr) internal pure returns (string memory) {
        return toHexString(uint256(uint160(addr)), ADDRESS_LENGTH);
    }

    /**
     * @dev Returns true if the two strings are equal.
     */
    function equal(string memory a, string memory b) internal pure returns (bool) {
        return bytes(a).length == bytes(b).length && keccak256(bytes(a)) == keccak256(bytes(b));
    }
}

File 6 of 21 : Ownable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (access/Ownable.sol)

pragma solidity ^0.8.20;

import {Context} from "../utils/Context.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * The initial owner is set to the address provided by the deployer. This can
 * later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    /**
     * @dev The caller account is not authorized to perform an operation.
     */
    error OwnableUnauthorizedAccount(address account);

    /**
     * @dev The owner is not a valid owner account. (eg. `address(0)`)
     */
    error OwnableInvalidOwner(address owner);

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the address provided by the deployer as the initial owner.
     */
    constructor(address initialOwner) {
        if (initialOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _transferOwnership(initialOwner);
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        if (owner() != _msgSender()) {
            revert OwnableUnauthorizedAccount(_msgSender());
        }
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby disabling any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        if (newOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

File 7 of 21 : IPeripheryImmutableState.sol
// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity >=0.5.0;

/// @title Immutable state
/// @notice Functions that return immutable state of the router
interface IPeripheryImmutableState {
    /// @return Returns the address of the Uniswap V3 factory
    function factory() external view returns (address);

    /// @return Returns the address of WETH9
    function WETH9() external view returns (address);
}

File 8 of 21 : ERC20Events.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

library ERC20Events {
    event Approval(
        address indexed owner,
        address indexed spender,
        uint256 value
    );

    event Transfer(
        address indexed from,
        address indexed to,
        uint256 indexed amount
    );
}

File 9 of 21 : ERC721Events.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

library ERC721Events {
    event ApprovalForAll(
        address indexed owner,
        address indexed operator,
        bool approved
    );

    event Approval(
        address indexed owner,
        address indexed spender,
        uint256 indexed tokenId
    );

    event Transfer(
        address indexed from,
        address indexed to,
        uint256 indexed tokenId
    );
}

File 10 of 21 : PackedDoubleEndedQueue.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (utils/structs/DoubleEndedQueue.sol)
// Modified by Pandora Labs to support native packed operations
pragma solidity ^0.8.20;

/**
 * @dev A sequence of items with the ability to efficiently push and pop items (i.e. insert and remove) on both ends of
 * the sequence (called front and back). Among other access patterns, it can be used to implement efficient LIFO and
 * FIFO queues. Storage use is optimized, and all operations are O(1) constant time. This includes {clear}, given that
 * the existing queue contents are left in storage.
 *
 * The struct is called `Uint16Deque`. And is designed for packed uint16 values, though this approach can be
 * extrapolated to different implementations. This data structure can only be used in storage, and not in memory.
 *
 * ```solidity
 * PackedDoubleEndedQueue.Uint16Deque queue;
 * ```
 */
library PackedDoubleEndedQueue {
    uint128 constant SLOT_MASK = (1 << 64) - 1;
    uint128 constant INDEX_MASK = SLOT_MASK << 64;

    uint256 constant SLOT_DATA_MASK = (1 << 16) - 1;

    /**
     * @dev An operation (e.g. {front}) couldn't be completed due to the queue being empty.
     */
    error QueueEmpty();

    /**
     * @dev A push operation couldn't be completed due to the queue being full.
     */
    error QueueFull();

    /**
     * @dev An operation (e.g. {at}) couldn't be completed due to an index being out of bounds.
     */
    error QueueOutOfBounds();

    /**
     * @dev Invalid slot.
     */
    error InvalidSlot();

    /**
     * @dev Indices and slots are 64 bits to fit within a single storage slot.
     *
     * Struct members have an underscore prefix indicating that they are "private" and should not be read or written to
     * directly. Use the functions provided below instead. Modifying the struct manually may violate assumptions and
     * lead to unexpected behavior.
     *
     * The first item is at data[begin] and the last item is at data[end - 1]. This range can wrap around.
     */
    struct Uint16Deque {
        uint64 _beginIndex;
        uint64 _beginSlot;
        uint64 _endIndex;
        uint64 _endSlot;
        mapping(uint64 index => uint256) _data;
    }

    /**
     * @dev Removes the item at the end of the queue and returns it.
     *
     * Reverts with {QueueEmpty} if the queue is empty.
     */
    function popBack(
        Uint16Deque storage deque
    ) internal returns (uint16 value) {
        unchecked {
            uint64 backIndex = deque._endIndex;
            uint64 backSlot = deque._endSlot;

            if (backIndex == deque._beginIndex && backSlot == deque._beginSlot)
                revert QueueEmpty();

            if (backSlot == 0) {
                --backIndex;
                backSlot = 15;
            } else {
                --backSlot;
            }

            uint256 data = deque._data[backIndex];

            value = _getEntry(data, backSlot);
            deque._data[backIndex] = _setData(data, backSlot, 0);

            deque._endIndex = backIndex;
            deque._endSlot = backSlot;
        }
    }

    /**
     * @dev Inserts an item at the beginning of the queue.
     *
     * Reverts with {QueueFull} if the queue is full.
     */
    function pushFront(Uint16Deque storage deque, uint16 value_) internal {
        unchecked {
            uint64 frontIndex = deque._beginIndex;
            uint64 frontSlot = deque._beginSlot;

            if (frontSlot == 0) {
                --frontIndex;
                frontSlot = 15;
            } else {
                --frontSlot;
            }

            if (frontIndex == deque._endIndex) revert QueueFull();

            deque._data[frontIndex] = _setData(
                deque._data[frontIndex],
                frontSlot,
                value_
            );
            deque._beginIndex = frontIndex;
            deque._beginSlot = frontSlot;
        }
    }

    /**
     * @dev Return the item at a position in the queue given by `index`, with the first item at 0 and last item at
     * `length(deque) - 1`.
     *
     * Reverts with `QueueOutOfBounds` if the index is out of bounds.
     */
    function at(
        Uint16Deque storage deque,
        uint256 index_
    ) internal view returns (uint16 value) {
        if (index_ >= length(deque) * 16) revert QueueOutOfBounds();

        unchecked {
            return
                _getEntry(
                    deque._data[
                        deque._beginIndex +
                            uint64(deque._beginSlot + (index_ % 16)) /
                            16 +
                            uint64(index_ / 16)
                    ],
                    uint64(((deque._beginSlot + index_) % 16))
                );
        }
    }

    /**
     * @dev Returns the number of items in the queue.
     */
    function length(Uint16Deque storage deque) internal view returns (uint256) {
        unchecked {
            return
                (16 - deque._beginSlot) +
                deque._endSlot +
                deque._endIndex *
                16 -
                deque._beginIndex *
                16 -
                16;
        }
    }

    /**
     * @dev Returns true if the queue is empty.
     */
    function empty(Uint16Deque storage deque) internal view returns (bool) {
        return
            deque._endSlot == deque._beginSlot &&
            deque._endIndex == deque._beginIndex;
    }

    function _setData(
        uint256 data_,
        uint64 slot_,
        uint16 value
    ) private pure returns (uint256) {
        return
            (data_ & (~_getSlotMask(slot_))) + (uint256(value) << (16 * slot_));
    }

    function _getEntry(
        uint256 data,
        uint64 slot_
    ) private pure returns (uint16) {
        return uint16((data & _getSlotMask(slot_)) >> (16 * slot_));
    }

    function _getSlotMask(uint64 slot_) private pure returns (uint256) {
        return SLOT_DATA_MASK << (slot_ * 16);
    }
}

File 11 of 21 : IERC404.sol
//SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

import {IERC165} from "@openzeppelin/contracts/interfaces/IERC165.sol";
import {IERC721} from "@openzeppelin/contracts/interfaces/IERC721.sol";

interface IERC404 is IERC165 {
    event ERC20Approval(
        address indexed owner,
        address indexed spender,
        uint256 value
    );
    event ERC721Approval(
        address indexed owner,
        address indexed spender,
        uint256 indexed tokenId
    );
    event ERC20Transfer(
        address indexed from,
        address indexed to,
        uint256 indexed amount
    );
    event ERC721Transfer(
        address indexed from,
        address indexed to,
        uint256 indexed tokenId
    );

    error NotFound();
    error InvalidTokenId();
    error AlreadyExists();
    error InvalidRecipient();
    error InvalidSender();
    error InvalidSpender();
    error InvalidOperator();
    error UnsafeRecipient();
    error RecipientIsERC721TransferExempt();
    error Unauthorized();
    error InsufficientAllowance();
    error DecimalsTooLow();
    error PermitDeadlineExpired();
    error InvalidSigner();
    error InvalidApproval();
    error OwnedIndexOverflow();
    error MintLimitReached();
    error InvalidExemption();

    function name() external view returns (string memory);

    function symbol() external view returns (string memory);

    function decimals() external view returns (uint8);

    function totalSupply() external view returns (uint256);

    function erc20TotalSupply() external view returns (uint256);

    function erc721TotalSupply() external view returns (uint256);

    function balanceOf(address owner_) external view returns (uint256);

    function erc721BalanceOf(address owner_) external view returns (uint256);

    function erc20BalanceOf(address owner_) external view returns (uint256);

    function erc721TransferExempt(address account_)
        external
        view
        returns (bool);

    function isApprovedForAll(address owner_, address operator_)
        external
        view
        returns (bool);

    function allowance(address owner_, address spender_)
        external
        view
        returns (uint256);

    function owned(address owner_) external view returns (uint256[] memory);

    function ownerOf(uint256 id_) external view returns (address erc721Owner);

    function tokenURI(uint256 id_) external view returns (string memory);

    function approve(address spender_, uint256 valueOrId_)
        external
        returns (bool);

    function erc20Approve(address spender_, uint256 value_)
        external
        returns (bool);

    function erc721Approve(address spender_, uint256 id_) external;

    function setApprovalForAll(address operator_, bool approved_) external;

    function transferFrom(
        address from_,
        address to_,
        uint256 valueOrId_
    ) external returns (bool);

    function erc20TransferFrom(
        address from_,
        address to_,
        uint256 value_
    ) external returns (bool);

    function erc721TransferFrom(
        address from_,
        address to_,
        uint256 id_
    ) external;

    function transfer(address to_, uint256 amount_) external returns (bool);

    function getERC721QueueLength() external view returns (uint256);

    function getERC721TokensInQueue(uint256 start_, uint256 count_)
        external
        view
        returns (uint256[] memory);

    function setSelfERC721TransferExempt(bool state_) external;

    function safeTransferFrom(
        address from_,
        address to_,
        uint256 id_
    ) external;

    function safeTransferFrom(
        address from_,
        address to_,
        uint256 id_,
        bytes calldata data_
    ) external;

    function DOMAIN_SEPARATOR() external view returns (bytes32);

    function permit(
        address owner_,
        address spender_,
        uint256 value_,
        uint256 deadline_,
        uint8 v_,
        bytes32 r_,
        bytes32 s_
    ) external;
}

File 12 of 21 : IERC165.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (interfaces/IERC165.sol)

pragma solidity ^0.8.20;

import {IERC165} from "../utils/introspection/IERC165.sol";

File 13 of 21 : IERC721Metadata.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (interfaces/IERC721Metadata.sol)

pragma solidity ^0.8.20;

import {IERC721Metadata} from "../token/ERC721/extensions/IERC721Metadata.sol";

File 14 of 21 : IERC721.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (interfaces/IERC721.sol)

pragma solidity ^0.8.20;

import {IERC721} from "../token/ERC721/IERC721.sol";

File 15 of 21 : IERC721Receiver.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (interfaces/IERC721Receiver.sol)

pragma solidity ^0.8.20;

import {IERC721Receiver} from "../token/ERC721/IERC721Receiver.sol";

File 16 of 21 : SignedMath.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (utils/math/SignedMath.sol)

pragma solidity ^0.8.20;

/**
 * @dev Standard signed math utilities missing in the Solidity language.
 */
library SignedMath {
    /**
     * @dev Returns the largest of two signed numbers.
     */
    function max(int256 a, int256 b) internal pure returns (int256) {
        return a > b ? a : b;
    }

    /**
     * @dev Returns the smallest of two signed numbers.
     */
    function min(int256 a, int256 b) internal pure returns (int256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two signed numbers without overflow.
     * The result is rounded towards zero.
     */
    function average(int256 a, int256 b) internal pure returns (int256) {
        // Formula from the book "Hacker's Delight"
        int256 x = (a & b) + ((a ^ b) >> 1);
        return x + (int256(uint256(x) >> 255) & (a ^ b));
    }

    /**
     * @dev Returns the absolute unsigned value of a signed value.
     */
    function abs(int256 n) internal pure returns (uint256) {
        unchecked {
            // must be unchecked in order to support `n = type(int256).min`
            return uint256(n >= 0 ? n : -n);
        }
    }
}

File 17 of 21 : Math.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (utils/math/Math.sol)

pragma solidity ^0.8.20;

/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library Math {
    /**
     * @dev Muldiv operation overflow.
     */
    error MathOverflowedMulDiv();

    enum Rounding {
        Floor, // Toward negative infinity
        Ceil, // Toward positive infinity
        Trunc, // Toward zero
        Expand // Away from zero
    }

    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            uint256 c = a + b;
            if (c < a) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, with an overflow flag.
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b > a) return (false, 0);
            return (true, a - b);
        }
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
            // benefit is lost if 'b' is also tested.
            // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
            if (a == 0) return (true, 0);
            uint256 c = a * b;
            if (c / a != b) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a / b);
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a % b);
        }
    }

    /**
     * @dev Returns the largest of two numbers.
     */
    function max(uint256 a, uint256 b) internal pure returns (uint256) {
        return a > b ? a : b;
    }

    /**
     * @dev Returns the smallest of two numbers.
     */
    function min(uint256 a, uint256 b) internal pure returns (uint256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two numbers. The result is rounded towards
     * zero.
     */
    function average(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b) / 2 can overflow.
        return (a & b) + (a ^ b) / 2;
    }

    /**
     * @dev Returns the ceiling of the division of two numbers.
     *
     * This differs from standard division with `/` in that it rounds towards infinity instead
     * of rounding towards zero.
     */
    function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) {
        if (b == 0) {
            // Guarantee the same behavior as in a regular Solidity division.
            return a / b;
        }

        // (a + b - 1) / b can overflow on addition, so we distribute.
        return a == 0 ? 0 : (a - 1) / b + 1;
    }

    /**
     * @notice Calculates floor(x * y / denominator) with full precision. Throws if result overflows a uint256 or
     * denominator == 0.
     * @dev Original credit to Remco Bloemen under MIT license (https://xn--2-umb.com/21/muldiv) with further edits by
     * Uniswap Labs also under MIT license.
     */
    function mulDiv(uint256 x, uint256 y, uint256 denominator) internal pure returns (uint256 result) {
        unchecked {
            // 512-bit multiply [prod1 prod0] = x * y. Compute the product mod 2^256 and mod 2^256 - 1, then use
            // use the Chinese Remainder Theorem to reconstruct the 512 bit result. The result is stored in two 256
            // variables such that product = prod1 * 2^256 + prod0.
            uint256 prod0 = x * y; // Least significant 256 bits of the product
            uint256 prod1; // Most significant 256 bits of the product
            assembly {
                let mm := mulmod(x, y, not(0))
                prod1 := sub(sub(mm, prod0), lt(mm, prod0))
            }

            // Handle non-overflow cases, 256 by 256 division.
            if (prod1 == 0) {
                // Solidity will revert if denominator == 0, unlike the div opcode on its own.
                // The surrounding unchecked block does not change this fact.
                // See https://docs.soliditylang.org/en/latest/control-structures.html#checked-or-unchecked-arithmetic.
                return prod0 / denominator;
            }

            // Make sure the result is less than 2^256. Also prevents denominator == 0.
            if (denominator <= prod1) {
                revert MathOverflowedMulDiv();
            }

            ///////////////////////////////////////////////
            // 512 by 256 division.
            ///////////////////////////////////////////////

            // Make division exact by subtracting the remainder from [prod1 prod0].
            uint256 remainder;
            assembly {
                // Compute remainder using mulmod.
                remainder := mulmod(x, y, denominator)

                // Subtract 256 bit number from 512 bit number.
                prod1 := sub(prod1, gt(remainder, prod0))
                prod0 := sub(prod0, remainder)
            }

            // Factor powers of two out of denominator and compute largest power of two divisor of denominator.
            // Always >= 1. See https://cs.stackexchange.com/q/138556/92363.

            uint256 twos = denominator & (0 - denominator);
            assembly {
                // Divide denominator by twos.
                denominator := div(denominator, twos)

                // Divide [prod1 prod0] by twos.
                prod0 := div(prod0, twos)

                // Flip twos such that it is 2^256 / twos. If twos is zero, then it becomes one.
                twos := add(div(sub(0, twos), twos), 1)
            }

            // Shift in bits from prod1 into prod0.
            prod0 |= prod1 * twos;

            // Invert denominator mod 2^256. Now that denominator is an odd number, it has an inverse modulo 2^256 such
            // that denominator * inv = 1 mod 2^256. Compute the inverse by starting with a seed that is correct for
            // four bits. That is, denominator * inv = 1 mod 2^4.
            uint256 inverse = (3 * denominator) ^ 2;

            // Use the Newton-Raphson iteration to improve the precision. Thanks to Hensel's lifting lemma, this also
            // works in modular arithmetic, doubling the correct bits in each step.
            inverse *= 2 - denominator * inverse; // inverse mod 2^8
            inverse *= 2 - denominator * inverse; // inverse mod 2^16
            inverse *= 2 - denominator * inverse; // inverse mod 2^32
            inverse *= 2 - denominator * inverse; // inverse mod 2^64
            inverse *= 2 - denominator * inverse; // inverse mod 2^128
            inverse *= 2 - denominator * inverse; // inverse mod 2^256

            // Because the division is now exact we can divide by multiplying with the modular inverse of denominator.
            // This will give us the correct result modulo 2^256. Since the preconditions guarantee that the outcome is
            // less than 2^256, this is the final result. We don't need to compute the high bits of the result and prod1
            // is no longer required.
            result = prod0 * inverse;
            return result;
        }
    }

    /**
     * @notice Calculates x * y / denominator with full precision, following the selected rounding direction.
     */
    function mulDiv(uint256 x, uint256 y, uint256 denominator, Rounding rounding) internal pure returns (uint256) {
        uint256 result = mulDiv(x, y, denominator);
        if (unsignedRoundsUp(rounding) && mulmod(x, y, denominator) > 0) {
            result += 1;
        }
        return result;
    }

    /**
     * @dev Returns the square root of a number. If the number is not a perfect square, the value is rounded
     * towards zero.
     *
     * Inspired by Henry S. Warren, Jr.'s "Hacker's Delight" (Chapter 11).
     */
    function sqrt(uint256 a) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }

        // For our first guess, we get the biggest power of 2 which is smaller than the square root of the target.
        //
        // We know that the "msb" (most significant bit) of our target number `a` is a power of 2 such that we have
        // `msb(a) <= a < 2*msb(a)`. This value can be written `msb(a)=2**k` with `k=log2(a)`.
        //
        // This can be rewritten `2**log2(a) <= a < 2**(log2(a) + 1)`
        // β†’ `sqrt(2**k) <= sqrt(a) < sqrt(2**(k+1))`
        // β†’ `2**(k/2) <= sqrt(a) < 2**((k+1)/2) <= 2**(k/2 + 1)`
        //
        // Consequently, `2**(log2(a) / 2)` is a good first approximation of `sqrt(a)` with at least 1 correct bit.
        uint256 result = 1 << (log2(a) >> 1);

        // At this point `result` is an estimation with one bit of precision. We know the true value is a uint128,
        // since it is the square root of a uint256. Newton's method converges quadratically (precision doubles at
        // every iteration). We thus need at most 7 iteration to turn our partial result with one bit of precision
        // into the expected uint128 result.
        unchecked {
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            return min(result, a / result);
        }
    }

    /**
     * @notice Calculates sqrt(a), following the selected rounding direction.
     */
    function sqrt(uint256 a, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = sqrt(a);
            return result + (unsignedRoundsUp(rounding) && result * result < a ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 2 of a positive value rounded towards zero.
     * Returns 0 if given 0.
     */
    function log2(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 128;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 64;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 32;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 16;
            }
            if (value >> 8 > 0) {
                value >>= 8;
                result += 8;
            }
            if (value >> 4 > 0) {
                value >>= 4;
                result += 4;
            }
            if (value >> 2 > 0) {
                value >>= 2;
                result += 2;
            }
            if (value >> 1 > 0) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 2, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log2(value);
            return result + (unsignedRoundsUp(rounding) && 1 << result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 10 of a positive value rounded towards zero.
     * Returns 0 if given 0.
     */
    function log10(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >= 10 ** 64) {
                value /= 10 ** 64;
                result += 64;
            }
            if (value >= 10 ** 32) {
                value /= 10 ** 32;
                result += 32;
            }
            if (value >= 10 ** 16) {
                value /= 10 ** 16;
                result += 16;
            }
            if (value >= 10 ** 8) {
                value /= 10 ** 8;
                result += 8;
            }
            if (value >= 10 ** 4) {
                value /= 10 ** 4;
                result += 4;
            }
            if (value >= 10 ** 2) {
                value /= 10 ** 2;
                result += 2;
            }
            if (value >= 10 ** 1) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 10, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log10(value);
            return result + (unsignedRoundsUp(rounding) && 10 ** result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 256 of a positive value rounded towards zero.
     * Returns 0 if given 0.
     *
     * Adding one to the result gives the number of pairs of hex symbols needed to represent `value` as a hex string.
     */
    function log256(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 16;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 8;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 4;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 2;
            }
            if (value >> 8 > 0) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 256, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log256(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log256(value);
            return result + (unsignedRoundsUp(rounding) && 1 << (result << 3) < value ? 1 : 0);
        }
    }

    /**
     * @dev Returns whether a provided rounding mode is considered rounding up for unsigned integers.
     */
    function unsignedRoundsUp(Rounding rounding) internal pure returns (bool) {
        return uint8(rounding) % 2 == 1;
    }
}

File 18 of 21 : Context.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.1) (utils/Context.sol)

pragma solidity ^0.8.20;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }

    function _contextSuffixLength() internal view virtual returns (uint256) {
        return 0;
    }
}

File 19 of 21 : IERC721Receiver.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC721/IERC721Receiver.sol)

pragma solidity ^0.8.20;

/**
 * @title ERC721 token receiver interface
 * @dev Interface for any contract that wants to support safeTransfers
 * from ERC721 asset contracts.
 */
interface IERC721Receiver {
    /**
     * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}
     * by `operator` from `from`, this function is called.
     *
     * It must return its Solidity selector to confirm the token transfer.
     * If any other value is returned or the interface is not implemented by the recipient, the transfer will be
     * reverted.
     *
     * The selector can be obtained in Solidity with `IERC721Receiver.onERC721Received.selector`.
     */
    function onERC721Received(
        address operator,
        address from,
        uint256 tokenId,
        bytes calldata data
    ) external returns (bytes4);
}

File 20 of 21 : IERC721Metadata.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC721/extensions/IERC721Metadata.sol)

pragma solidity ^0.8.20;

import {IERC721} from "../IERC721.sol";

/**
 * @title ERC-721 Non-Fungible Token Standard, optional metadata extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Metadata is IERC721 {
    /**
     * @dev Returns the token collection name.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the token collection symbol.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
     */
    function tokenURI(uint256 tokenId) external view returns (string memory);
}

File 21 of 21 : IERC721.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC721/IERC721.sol)

pragma solidity ^0.8.20;

import {IERC165} from "../../utils/introspection/IERC165.sol";

/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721 is IERC165 {
    /**
     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
     */
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
     */
    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
     */
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);

    /**
     * @dev Returns the number of tokens in ``owner``'s account.
     */
    function balanceOf(address owner) external view returns (uint256 balance);

    /**
     * @dev Returns the owner of the `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function ownerOf(uint256 tokenId) external view returns (address owner);

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon
     *   a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(address from, address to, uint256 tokenId, bytes calldata data) external;

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must have been allowed to move this token by either {approve} or
     *   {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon
     *   a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(address from, address to, uint256 tokenId) external;

    /**
     * @dev Transfers `tokenId` token from `from` to `to`.
     *
     * WARNING: Note that the caller is responsible to confirm that the recipient is capable of receiving ERC721
     * or else they may be permanently lost. Usage of {safeTransferFrom} prevents loss, though the caller must
     * understand this adds an external call which potentially creates a reentrancy vulnerability.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address from, address to, uint256 tokenId) external;

    /**
     * @dev Gives permission to `to` to transfer `tokenId` token to another account.
     * The approval is cleared when the token is transferred.
     *
     * Only a single account can be approved at a time, so approving the zero address clears previous approvals.
     *
     * Requirements:
     *
     * - The caller must own the token or be an approved operator.
     * - `tokenId` must exist.
     *
     * Emits an {Approval} event.
     */
    function approve(address to, uint256 tokenId) external;

    /**
     * @dev Approve or remove `operator` as an operator for the caller.
     * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
     *
     * Requirements:
     *
     * - The `operator` cannot be the address zero.
     *
     * Emits an {ApprovalForAll} event.
     */
    function setApprovalForAll(address operator, bool approved) external;

    /**
     * @dev Returns the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function getApproved(uint256 tokenId) external view returns (address operator);

    /**
     * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
     *
     * See {setApprovalForAll}
     */
    function isApprovedForAll(address owner, address operator) external view returns (bool);
}

File 22 of 21 : IERC165.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (utils/introspection/IERC165.sol)

pragma solidity ^0.8.20;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

Settings
{
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

Contract ABI

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","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner_","type":"address"},{"internalType":"address","name":"spender_","type":"address"},{"internalType":"uint256","name":"value_","type":"uint256"},{"internalType":"uint256","name":"deadline_","type":"uint256"},{"internalType":"uint8","name":"v_","type":"uint8"},{"internalType":"bytes32","name":"r_","type":"bytes32"},{"internalType":"bytes32","name":"s_","type":"bytes32"}],"name":"permit","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from_","type":"address"},{"internalType":"address","name":"to_","type":"address"},{"internalType":"uint256","name":"id_","type":"uint256"}],"name":"safeTransferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from_","type":"address"},{"internalType":"address","name":"to_","type":"address"},{"internalType":"uint256","name":"id_","type":"uint256"},{"internalType":"bytes","name":"data_","type":"bytes"}],"name":"safeTransferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"operator_","type":"address"},{"internalType":"bool","name":"approved_","type":"bool"}],"name":"setApprovalForAll","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"string","name":"_dataURI","type":"string"}],"name":"setDataURI","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"account_","type":"address"},{"internalType":"bool","name":"value_","type":"bool"}],"name":"setERC721TransferExempt","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bool","name":"state_","type":"bool"}],"name":"setSelfERC721TransferExempt","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"string","name":"_tokenURI","type":"string"}],"name":"setTokenURI","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes4","name":"interfaceId","type":"bytes4"}],"name":"supportsInterface","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_tokenId","type":"uint256"}],"name":"tokenURI","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"to_","type":"address"},{"internalType":"uint256","name":"value_","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from_","type":"address"},{"internalType":"address","name":"to_","type":"address"},{"internalType":"uint256","name":"valueOrId_","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"uniswapSwapRouter_","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"uniswapV3NonfungiblePositionManager_","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"units","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"}]

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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.