A full decompilation and automatic security analysis of all contracts on the Ethereum and the Fantom blockchains. Updated hourly with new contracts uploaded to both networks. Analysis results by Dedaub.

Contract Library by Dedaub

trader

side

matchingPolicy

collection

tokenId

amount

paymentToken

price

listingTime

expirationTime

fees

salt

extraParams

makerAsk

takerBid

canMatchMakerAsk

makerBid

takerAsk

canMatchMakerBid

// SPDX-License-Identifier: MIT
pragma solidity 0.8.17;

import {Order, AssetType} from "OrderStructs.sol";

interface IMatchingPolicy {
    function canMatchMakerAsk(Order calldata makerAsk, Order calldata takerBid)
        external
        view
        returns (
            bool,
            uint256,
            uint256,
            uint256,
            AssetType
        );

    function canMatchMakerBid(Order calldata makerBid, Order calldata takerAsk)
        external
        view
        returns (
            bool,
            uint256,
            uint256,
            uint256,
            AssetType
        );
}

IMatchingPolicy.sol

// SPDX-License-Identifier: MIT
pragma solidity 0.8.17;

enum Side { Buy, Sell }
enum SignatureVersion { Single, Bulk }
enum AssetType { ERC721, ERC1155 }

struct Fee {
    uint16 rate;
    address payable recipient;
}

struct Order {
    address trader;
    Side side;
    address matchingPolicy;
    address collection;
    uint256 tokenId;
    uint256 amount;
    address paymentToken;
    uint256 price;
    uint256 listingTime;
    /* Order expiration timestamp - 0 for oracle cancellations. */
    uint256 expirationTime;
    Fee[] fees;
    uint256 salt;
    bytes extraParams;
}

struct Input {
    Order order;
    uint8 v;
    bytes32 r;
    bytes32 s;
    bytes extraSignature;
    SignatureVersion signatureVersion;
    uint256 blockNumber;
}

struct Execution {
  Input sell;
  Input buy;
}

OrderStructs.sol

// SPDX-License-Identifier: MIT
pragma solidity 0.8.17;

import {Order, AssetType} from "OrderStructs.sol";
import {IMatchingPolicy} from "IMatchingPolicy.sol";

/**
 * @title StandardPolicyERC721
 * @dev Policy for matching orders at a fixed price for a specific ERC721 tokenId (requires oracle authorization on both orders)
 */
contract StandardPolicyERC721 is IMatchingPolicy {
    function canMatchMakerAsk(Order calldata makerAsk, Order calldata takerBid)
        external
        pure
        override
        returns (
            bool,
            uint256,
            uint256,
            uint256,
            AssetType
        )
    {
        return (
            (makerAsk.side != takerBid.side) &&
            (makerAsk.paymentToken == takerBid.paymentToken) &&
            (makerAsk.collection == takerBid.collection) &&
            (makerAsk.tokenId == takerBid.tokenId) &&
            (makerAsk.extraParams.length > 0 && makerAsk.extraParams[0] == "\x01") &&
            (takerBid.extraParams.length > 0 && takerBid.extraParams[0] == "\x01") &&
            (makerAsk.amount == 1) &&
            (takerBid.amount == 1) &&
            (makerAsk.matchingPolicy == takerBid.matchingPolicy) &&
            (makerAsk.price == takerBid.price),
            makerAsk.price,
            makerAsk.tokenId,
            1,
            AssetType.ERC721
        );
    }

    function canMatchMakerBid(Order calldata makerBid, Order calldata takerAsk)
        external
        pure
        override
        returns (
            bool,
            uint256,
            uint256,
            uint256,
            AssetType
        )
    {
        return (
            (makerBid.side != takerAsk.side) &&
            (makerBid.paymentToken == takerAsk.paymentToken) &&
            (makerBid.collection == takerAsk.collection) &&
            (makerBid.tokenId == takerAsk.tokenId) &&
            (makerBid.extraParams.length > 0 && makerBid.extraParams[0] == "\x01") &&
            (takerAsk.extraParams.length > 0 && takerAsk.extraParams[0] == "\x01") &&
            (makerBid.amount == 1) &&
            (takerAsk.amount == 1) &&
            (makerBid.matchingPolicy == takerAsk.matchingPolicy) &&
            (makerBid.price == takerAsk.price),
            makerBid.price,
            makerBid.tokenId,
            1,
            AssetType.ERC721
        );
    }
}

StandardPolicyERC721.sol

__ANONYMOUS__