ETH Price: $2,704.88 (-0.61%)

Contract

0x06fA5a24f619EAF27CafAEeE64b8099efFaA5Bf1
 

Overview

ETH Balance

0.027011741763869783 ETH

Eth Value

$73.06 (@ $2,704.88/ETH)

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210568172024-10-27 11:58:47109 days ago1730030327
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210471652024-10-26 3:39:23111 days ago1729913963
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210469872024-10-26 3:03:23111 days ago1729911803
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210463222024-10-26 0:49:11111 days ago1729903751
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210451822024-10-25 21:00:35111 days ago1729890035
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Similar Match Source Code
This contract matches the deployed Bytecode of the Source Code for Contract 0x79361656...50a4278Fd
The constructor portion of the code might be different and could alter the actual behaviour of the contract

Contract Name:
XpPair

Compiler Version
v0.5.16+commit.9c3226ce

Optimization Enabled:
Yes with 200 runs

Other Settings:
istanbul EvmVersion
File 1 of 1 : XpPair.sol
pragma solidity =0.5.16;

interface IXpPair {
    event Approval(address indexed owner, address indexed spender, uint256 value);
    event Transfer(address indexed from, address indexed to, uint256 value);

    function setMetadata(
        string calldata website,
        string calldata image,
        string calldata description,
        string calldata chat,
        string calldata social
    ) external;
    function fetchMetadata()
        external
        view
        returns (string memory, string memory, string memory, string memory, string memory);

    function name() external pure returns (string memory);
    function symbol() external pure returns (string memory);
    function decimals() external pure returns (uint8);
    function totalSupply() external view returns (uint256);
    function balanceOf(address owner) external view returns (uint256);
    function allowance(address owner, address spender) external view returns (uint256);

    function updateProvider(address user) external;
    function euler(uint256) external view returns (uint256);
    function viewShare() external view returns (uint256 share);
    function claimShare() external;
    function poolBalance() external view returns (uint256);
    function totalCollected() external view returns (uint256);

    function updateProtocol(address) external;
    function setProtocol() external;
    function protocol() external view returns (address);
    function payableProtocol() external view returns (address payable origin);

    function creator() external view returns (address);
    function renounce() external;

    function setFees() external;
    function updateFees(uint8, uint8, uint8, uint8) external;
    function buyLpFee() external view returns (uint8);
    function sellLpFee() external view returns (uint8);
    function buyProtocolFee() external view returns (uint8);
    function sellProtocolFee() external view returns (uint8);
    function buyTotalFee() external view returns (uint8);
    function sellTotalFee() external view returns (uint8);

    function approve(address spender, uint256 value) external returns (bool);
    function transfer(address to, uint256 value) external returns (bool);
    function transferFrom(address from, address to, uint256 value) external returns (bool);

    function DOMAIN_SEPARATOR() external view returns (bytes32);
    function PERMIT_TYPEHASH() external pure returns (bytes32);
    function nonces(address owner) external view returns (uint256);

    function permit(address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s)
        external;

    event Mint(address indexed sender, uint256 amount0, uint256 amount1);
    event Burn(address indexed sender, uint256 amount0, uint256 amount1, address indexed to);
    event Swap(
        address indexed sender,
        uint256 amount0In,
        uint256 amount1In,
        uint256 amount0Out,
        uint256 amount1Out,
        address indexed to
    );
    event Sync(uint112 reserve0, uint112 reserve1);

    function MINIMUM_LIQUIDITY() external pure returns (uint256);
    function factory() external view returns (address);
    function token0() external view returns (address);
    function token1() external view returns (address);
    function getReserves() external view returns (uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast);
    function price0CumulativeLast() external view returns (uint256);
    function price1CumulativeLast() external view returns (uint256);
    function kLast() external view returns (uint256);

    function first_mint(
        address to,
        uint8 buyLp,
        uint8 sellLp,
        uint8 buyProtocol,
        uint8 sellProtocol,
        address protocolAddress
    ) external returns (uint256 liquidity);
    function mint(address to) external returns (uint256 liquidity);
    function burn(address to) external returns (uint256 amount0, uint256 amount1);
    function swap(uint256 amount0Out, uint256 amount1Out, address to, bytes calldata data) external;
    function skim(address to) external;
    function sync() external;

    function initialize(address _token0, address _token1) external;
}

interface IXpERC20 {
    event Approval(address indexed owner, address indexed spender, uint256 value);
    event Transfer(address indexed from, address indexed to, uint256 value);

    function name() external pure returns (string memory);
    function symbol() external pure returns (string memory);
    function decimals() external pure returns (uint8);
    function totalSupply() external view returns (uint256);
    function balanceOf(address owner) external view returns (uint256);
    function allowance(address owner, address spender) external view returns (uint256);

    function approve(address spender, uint256 value) external returns (bool);
    function transfer(address to, uint256 value) external returns (bool);
    function transferFrom(address from, address to, uint256 value) external returns (bool);

    function DOMAIN_SEPARATOR() external view returns (bytes32);
    function PERMIT_TYPEHASH() external pure returns (bytes32);
    function nonces(address owner) external view returns (uint256);

    function permit(address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s)
        external;
}

interface IERC20 {
    event Approval(address indexed owner, address indexed spender, uint256 value);
    event Transfer(address indexed from, address indexed to, uint256 value);

    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 balanceOf(address owner) external view returns (uint256);
    function allowance(address owner, address spender) external view returns (uint256);

    function approve(address spender, uint256 value) external returns (bool);
    function transfer(address to, uint256 value) external returns (bool);
    function transferFrom(address from, address to, uint256 value) external returns (bool);
}

interface IXpFactory {
    event PairCreated(address indexed token0, address indexed token1, address pair, uint256);

    function feeTo() external view returns (address);
    function feeToSetter() external view returns (address);
    function routerSetter() external view returns (address);
    function router() external view returns (address);

    function getPair(address tokenA, address tokenB) external view returns (address pair);
    function allPairs(uint256) external view returns (address pair);
    function allPairsLength() external view returns (uint256);

    function createPair(address tokenA, address tokenB) external returns (address pair);

    function setFeeTo(address) external;
    function setFeeToSetter(address) external;
    function setRouterSetter(address) external;
    function setRouter(address) external;
}

interface IUniswapV2Callee {
    function uniswapV2Call(address sender, uint256 amount0, uint256 amount1, bytes calldata data) external;
}

library SafeMath {
    function add(uint256 x, uint256 y) internal pure returns (uint256 z) {
        require((z = x + y) >= x, "ds-math-add-overflow");
    }

    function sub(uint256 x, uint256 y) internal pure returns (uint256 z) {
        require((z = x - y) <= x, "ds-math-sub-underflow");
    }

    function mul(uint256 x, uint256 y) internal pure returns (uint256 z) {
        require(y == 0 || (z = x * y) / y == x, "ds-math-mul-overflow");
    }
}

library Math {
    function min(uint256 x, uint256 y) internal pure returns (uint256 z) {
        z = x < y ? x : y;
    }

    // babylonian method (https://en.wikipedia.org/wiki/Methods_of_computing_square_roots#Babylonian_method)
    function sqrt(uint256 y) internal pure returns (uint256 z) {
        if (y > 3) {
            z = y;
            uint256 x = y / 2 + 1;
            while (x < z) {
                z = x;
                x = (y / x + x) / 2;
            }
        } else if (y != 0) {
            z = 1;
        }
    }
}

library UQ112x112 {
    uint224 constant Q112 = 2 ** 112;

    // encode a uint112 as a UQ112x112
    function encode(uint112 y) internal pure returns (uint224 z) {
        z = uint224(y) * Q112; // never overflows
    }

    // divide a UQ112x112 by a uint112, returning a UQ112x112
    function uqdiv(uint224 x, uint112 y) internal pure returns (uint224 z) {
        z = x / uint224(y);
    }
}

contract XpERC20 is IXpERC20 {
    using SafeMath for uint256;

    string public constant name = "XP";
    string public constant symbol = "XP-LP";
    uint8 public constant decimals = 18;
    uint256 public totalSupply;
    address public factory;

    mapping(address => uint256) public balanceOf;
    mapping(address => mapping(address => uint256)) public allowance;

    bytes32 public DOMAIN_SEPARATOR;
    // keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)");
    bytes32 public constant PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;
    mapping(address => uint256) public nonces;

    event Approval(address indexed owner, address indexed spender, uint256 value);
    event Transfer(address indexed from, address indexed to, uint256 value);

    constructor() public {
        uint256 chainId;
        assembly {
            chainId := chainid
        }
        factory = msg.sender;
        DOMAIN_SEPARATOR = keccak256(
            abi.encode(
                keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"),
                keccak256(bytes(name)),
                keccak256(bytes("1")),
                chainId,
                address(this)
            )
        );
    }

    function _mint(address to, uint256 value) internal {
        totalSupply = totalSupply.add(value);
        balanceOf[to] = balanceOf[to].add(value);
        emit Transfer(address(0), to, value);
    }

    function _burn(address from, uint256 value) internal {
        balanceOf[from] = balanceOf[from].sub(value);
        totalSupply = totalSupply.sub(value);
        emit Transfer(from, address(0), value);
    }

    function _approve(address owner, address spender, uint256 value) private {
        allowance[owner][spender] = value;
        emit Approval(owner, spender, value);
    }

    function _transfer(address from, address to, uint256 value) private {
        balanceOf[from] = balanceOf[from].sub(value);
        balanceOf[to] = balanceOf[to].add(value);
        emit Transfer(from, to, value);
    }

    function transfer(address to, uint256 value) external returns (bool) {
        if (to != 0x000000000000000000000000000000000000dEaD) {
            require(msg.sender == IXpFactory(factory).router(), "XpPair: FORBIDDEN");
        }
        _transfer(msg.sender, to, value);
        return true;
    }

    function approve(address spender, uint256 value) external returns (bool) {
        require(spender == IXpFactory(factory).router(), "XpPair: FORBIDDEN");
        _approve(msg.sender, spender, value);
        return true;
    }

    function transferFrom(address from, address to, uint256 value) external returns (bool) {
        require(msg.sender == IXpFactory(factory).router(), "XpPair: FORBIDDEN");
        if (allowance[from][msg.sender] != uint256(-1)) {
            allowance[from][msg.sender] = allowance[from][msg.sender].sub(value);
        }
        _transfer(from, to, value);
        return true;
    }

    function permit(address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s)
        external
    {
        require(deadline >= block.timestamp, "XpPair: EXPIRED");
        require(spender == IXpFactory(factory).router(), "XpPair: FORBIDDEN");
        bytes32 digest = keccak256(
            abi.encodePacked(
                "\x19\x01",
                DOMAIN_SEPARATOR,
                keccak256(abi.encode(PERMIT_TYPEHASH, owner, spender, value, nonces[owner]++, deadline))
            )
        );
        address recoveredAddress = ecrecover(digest, v, r, s);
        require(recoveredAddress != address(0) && recoveredAddress == owner, "XpPair: INVALID_SIGNATURE");
        _approve(owner, spender, value);
    }
}

contract XpPair is IXpPair, XpERC20 {
    using SafeMath for uint256;
    using UQ112x112 for uint224;

    uint256 public constant MINIMUM_LIQUIDITY = 10 ** 3;
    uint256 private bigNumber = 10 ** 20; //prevents liqFee/totalSupply from rounding to 0.
    bytes4 private constant SELECTOR = bytes4(keccak256(bytes("transfer(address,uint256)")));

    address public factory;
    address public token0;
    address public token1;

    uint8 public buyLpFee;
    uint8 public sellLpFee;
    uint8 public buyProtocolFee;
    uint8 public sellProtocolFee;
    uint8 public buyTotalFee;
    uint8 public sellTotalFee;

    uint256 public startTime_fees = 0;
    uint8 public future_buyLpFee;
    uint8 public future_sellLpFee;
    uint8 public future_buyProtocolFee;
    uint8 public future_sellProtocolFee;

    uint256 public totalCollected;
    uint256 public poolBalance;

    uint256 public startTime_protocol = 0;
    address public protocol;
    address public future_protocol;

    address public creator;
    uint256 public creation_time;

    string public websiteUrl = "Null";
    string public imageUrl = "Null"; //IPFS link
    string public tokenDescription = "Null";
    string public chatUrl = "Null";
    string public socialUrl = "Null";

    struct Provider {
        uint256 lp;
        uint256 euler0;
    }

    uint256[] public euler;
    mapping(address => Provider) public Providers;

    uint112 private reserve0; // uses single storage slot, accessible via getReserves
    uint112 private reserve1; // uses single storage slot, accessible via getReserves
    uint32 private blockTimestampLast; // uses single storage slot, accessible via getReserves

    uint256 public price0CumulativeLast;
    uint256 public price1CumulativeLast;
    uint256 public kLast; // reserve0 * reserve1, as of immediately after the most recent liquidity event

    uint256 private unlocked = 1;

    modifier lock() {
        require(unlocked == 1, "Xp: LOCKED");
        unlocked = 0;
        _;
        unlocked = 1;
    }

    //called everytime a swap is performed
    function() external payable {
        require(msg.sender == IXpFactory(factory).router(), "XpPair: FORBIDDEN");
        poolBalance += msg.value;
        totalCollected += msg.value;
        updateEuler(msg.value);
    }

    //updates the euler constant - occurs everytime a swap is performed
    function updateEuler(uint256 liqFee) internal {
        if (euler.length == 0) {
            euler.push((liqFee * bigNumber) / totalSupply);
        } else {
            euler.push(euler[euler.length - 1] + (liqFee * bigNumber) / totalSupply);
        }
    }

    //called everytime liquidity is added/removed by the user
    function updateProvider(address user) external {
        require(msg.sender == IXpFactory(factory).router(), "XpPair: FORBIDDEN");
        if (euler.length == 0) {
            Providers[user] = Provider(balanceOf[user], 0);
        } else {
            Providers[user] = Provider(balanceOf[user], euler[euler.length - 1]);
        }
    }

    function claimShare() public lock {
        require(euler.length > 0, "XpPair: Nothing to Claim");
        uint256 share =
            (Providers[msg.sender].lp * (euler[euler.length - 1] - Providers[msg.sender].euler0)) / bigNumber;
        Providers[msg.sender] = Provider(balanceOf[msg.sender], euler[euler.length - 1]);
        poolBalance -= share;
        (bool sent,) = msg.sender.call.value(share)("");
        require(sent, "Failed to send Ether");
    }

    function viewShare() public view returns (uint256 share) {
        if (euler.length == 0) {
            return 0;
        } else {
            return Providers[msg.sender].lp * (euler[euler.length - 1] - Providers[msg.sender].euler0) / bigNumber;
        }
    }

    function updateFees(uint8 buyLpFuture, uint8 sellLpFuture, uint8 buyProtocolFuture, uint8 sellProtocolFuture)
        external
    {
        require(msg.sender == creator);
        startTime_fees = block.timestamp;
        future_buyLpFee = buyLpFuture;
        future_sellLpFee = sellLpFuture;
        future_buyProtocolFee = buyProtocolFuture;
        future_sellProtocolFee = sellProtocolFuture;
    }

    function setFees() external {
        require(startTime_fees != 0);
        require(msg.sender == creator && block.timestamp - startTime_fees >= 3 days);
        buyLpFee = future_buyLpFee;
        sellLpFee = future_sellLpFee;
        buyProtocolFee = future_buyProtocolFee;
        sellProtocolFee = future_sellProtocolFee;
        buyTotalFee = future_buyLpFee + future_buyProtocolFee + 1;
        sellTotalFee = future_sellLpFee + future_sellProtocolFee + 1;
    }

    function updateProtocol(address protocolFuture) external {
        require(msg.sender == creator);
        startTime_protocol = block.timestamp;
        future_protocol = protocolFuture;
    }

    function setProtocol() external {
        require(startTime_protocol != 0);
        require(msg.sender == creator && block.timestamp - startTime_protocol >= 3 days);
        protocol = future_protocol;
    }

    function payableProtocol() external view returns (address payable) {
        return address(uint160(protocol));
    }

    function setMetadata(
        string calldata website,
        string calldata image,
        string calldata description,
        string calldata chat,
        string calldata social
    ) external {
        require(msg.sender == creator);
        websiteUrl = website;
        imageUrl = image;
        tokenDescription = description;
        chatUrl = chat;
        socialUrl = social;
    }

    function fetchMetadata()
        public
        view
        returns (string memory, string memory, string memory, string memory, string memory)
    {
        return (websiteUrl, imageUrl, tokenDescription, chatUrl, socialUrl);
    }

    function renounce() external {
        require(msg.sender == creator);
        creator = 0x000000000000000000000000000000000000dEaD;
    }

    function getReserves() public view returns (uint112 _reserve0, uint112 _reserve1, uint32 _blockTimestampLast) {
        _reserve0 = reserve0;
        _reserve1 = reserve1;
        _blockTimestampLast = blockTimestampLast;
    }

    function _safeTransfer(address token, address to, uint256 value) private {
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(SELECTOR, to, value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), "Xp: TRANSFER_FAILED");
    }

    event Mint(address indexed sender, uint256 amount0, uint256 amount1);
    event Burn(address indexed sender, uint256 amount0, uint256 amount1, address indexed to);
    event Swap(
        address indexed sender,
        uint256 amount0In,
        uint256 amount1In,
        uint256 amount0Out,
        uint256 amount1Out,
        address indexed to
    );
    event Sync(uint112 reserve0, uint112 reserve1);

    constructor() public {
        factory = msg.sender;
    }

    // called once by the factory at time of deployment
    function initialize(address _token0, address _token1) external {
        require(msg.sender == factory, "XpPair: FORBIDDEN"); // sufficient check
        token0 = _token0;
        token1 = _token1;
    }

    // update reserves and, on the first call per block, price accumulators
    function _update(uint256 balance0, uint256 balance1, uint112 _reserve0, uint112 _reserve1) private {
        require(balance0 <= uint112(-1) && balance1 <= uint112(-1), "XpPair: OVERFLOW");
        uint32 blockTimestamp = uint32(block.timestamp % 2 ** 32);
        uint32 timeElapsed = blockTimestamp - blockTimestampLast; // overflow is desired
        if (timeElapsed > 0 && _reserve0 != 0 && _reserve1 != 0) {
            // * never overflows, and + overflow is desired
            price0CumulativeLast += uint256(UQ112x112.encode(_reserve1).uqdiv(_reserve0)) * timeElapsed;
            price1CumulativeLast += uint256(UQ112x112.encode(_reserve0).uqdiv(_reserve1)) * timeElapsed;
        }
        reserve0 = uint112(balance0);
        reserve1 = uint112(balance1);
        blockTimestampLast = blockTimestamp;
        emit Sync(reserve0, reserve1);
    }

    // if fee is on, mint liquidity equivalent to 1/6th of the growth in sqrt(k). This will never be on.
    function _mintFee(uint112 _reserve0, uint112 _reserve1) private returns (bool feeOn) {
        address feeTo = IXpFactory(factory).feeTo();
        feeOn = feeTo != address(0);
        uint256 _kLast = kLast; // gas savings
        if (feeOn) {
            if (_kLast != 0) {
                uint256 rootK = Math.sqrt(uint256(_reserve0).mul(_reserve1));
                uint256 rootKLast = Math.sqrt(_kLast);
                if (rootK > rootKLast) {
                    uint256 numerator = totalSupply.mul(rootK.sub(rootKLast));
                    uint256 denominator = rootK.mul(5).add(rootKLast);
                    uint256 liquidity = numerator / denominator;
                    if (liquidity > 0) _mint(feeTo, liquidity);
                }
            }
        } else if (_kLast != 0) {
            kLast = 0;
        }
    }

    // this low-level function should be called from a contract which performs important safety checks
    function first_mint(
        address to,
        uint8 buyLp,
        uint8 sellLp,
        uint8 buyProtocol,
        uint8 sellProtocol,
        address protocolAddress
    ) external lock returns (uint256 liquidity) {
        require(msg.sender == IXpFactory(factory).router(), "XpPair: FORBIDDEN");
        (uint112 _reserve0, uint112 _reserve1,) = getReserves(); // gas savings
        uint256 balance0 = IERC20(token0).balanceOf(address(this));
        uint256 balance1 = IERC20(token1).balanceOf(address(this));
        uint256 amount0 = balance0.sub(_reserve0);
        uint256 amount1 = balance1.sub(_reserve1);

        bool feeOn = _mintFee(_reserve0, _reserve1);
        uint256 _totalSupply = totalSupply; // gas savings, must be defined here since totalSupply can update in _mintFee
        require(_totalSupply == 0);
        liquidity = Math.sqrt(amount0.mul(amount1)).sub(MINIMUM_LIQUIDITY);
        _mint(address(0), MINIMUM_LIQUIDITY); // permanently lock the first MINIMUM_LIQUIDITY tokens

        creator = to;
        creation_time = block.timestamp;
        protocol = protocolAddress;
        buyLpFee = buyLp;
        sellLpFee = sellLp;
        buyProtocolFee = buyProtocol;
        sellProtocolFee = sellProtocol;
        buyTotalFee = buyLp + buyProtocol + 1;
        sellTotalFee = sellLp + sellProtocol + 1;

        require(liquidity > 0, "XpPair: INSUFFICIENT_LIQUIDITY_MINTED");
        _mint(to, liquidity);

        _update(balance0, balance1, _reserve0, _reserve1);
        if (feeOn) kLast = uint256(reserve0).mul(reserve1); // reserve0 and reserve1 are up-to-date
        emit Mint(msg.sender, amount0, amount1);
    }

    // this low-level function should be called from a contract which performs important safety checks
    function mint(address to) external lock returns (uint256 liquidity) {
        require(msg.sender == IXpFactory(factory).router(), "XpPair: FORBIDDEN");
        (uint112 _reserve0, uint112 _reserve1,) = getReserves(); // gas savings
        uint256 balance0 = IERC20(token0).balanceOf(address(this));
        uint256 balance1 = IERC20(token1).balanceOf(address(this));
        uint256 amount0 = balance0.sub(_reserve0);
        uint256 amount1 = balance1.sub(_reserve1);

        bool feeOn = _mintFee(_reserve0, _reserve1);
        uint256 _totalSupply = totalSupply; // gas savings, must be defined here since totalSupply can update in _mintFee
        if (_totalSupply == 0) {
            revert("Use first_mint instead");
        } else {
            liquidity = Math.min(amount0.mul(_totalSupply) / _reserve0, amount1.mul(_totalSupply) / _reserve1);
        }
        require(liquidity > 0, "XpPair: INSUFFICIENT_LIQUIDITY_MINTED");
        _mint(to, liquidity);

        _update(balance0, balance1, _reserve0, _reserve1);
        if (feeOn) kLast = uint256(reserve0).mul(reserve1); // reserve0 and reserve1 are up-to-date
        emit Mint(msg.sender, amount0, amount1);
    }

    // this low-level function should be called from a contract which performs important safety checks
    function burn(address to) external lock returns (uint256 amount0, uint256 amount1) {
        require(msg.sender == IXpFactory(factory).router(), "XpPair: FORBIDDEN");

        require(block.timestamp - creation_time >= 5 days, "XpPair: FORBIDDEN RUGPULL");

        (uint112 _reserve0, uint112 _reserve1,) = getReserves(); // gas savings
        address _token0 = token0; // gas savings
        address _token1 = token1; // gas savings
        uint256 balance0 = IERC20(_token0).balanceOf(address(this));
        uint256 balance1 = IERC20(_token1).balanceOf(address(this));
        uint256 liquidity = balanceOf[address(this)];

        bool feeOn = _mintFee(_reserve0, _reserve1);
        uint256 _totalSupply = totalSupply; // gas savings, must be defined here since totalSupply can update in _mintFee
        amount0 = liquidity.mul(balance0) / _totalSupply; // using balances ensures pro-rata distribution
        amount1 = liquidity.mul(balance1) / _totalSupply; // using balances ensures pro-rata distribution
        require(amount0 > 0 && amount1 > 0, "XpPair: INSUFFICIENT_LIQUIDITY_BURNED");
        _burn(address(this), liquidity);
        _safeTransfer(_token0, to, amount0);
        _safeTransfer(_token1, to, amount1);
        balance0 = IERC20(_token0).balanceOf(address(this));
        balance1 = IERC20(_token1).balanceOf(address(this));

        _update(balance0, balance1, _reserve0, _reserve1);
        if (feeOn) kLast = uint256(reserve0).mul(reserve1); // reserve0 and reserve1 are up-to-date
        emit Burn(msg.sender, amount0, amount1, to);
    }

    // this low-level function should be called from a contract which performs important safety checks
    function swap(uint256 amount0Out, uint256 amount1Out, address to, bytes calldata data) external lock {
        require(msg.sender == IXpFactory(factory).router(), "XpPair: FORBIDDEN");
        require(amount0Out > 0 || amount1Out > 0, "XpPair: INSUFFICIENT_OUTPUT_AMOUNT");
        (uint112 _reserve0, uint112 _reserve1,) = getReserves(); // gas savings
        require(amount0Out < _reserve0 && amount1Out < _reserve1, "XpPair: INSUFFICIENT_LIQUIDITY");

        uint256 balance0;
        uint256 balance1;
        {
            // scope for _token{0,1}, avoids stack too deep errors
            address _token0 = token0;
            address _token1 = token1;
            require(to != _token0 && to != _token1, "XpPair: INVALID_TO");
            if (amount0Out > 0) _safeTransfer(_token0, to, amount0Out); // optimistically transfer tokens
            if (amount1Out > 0) _safeTransfer(_token1, to, amount1Out); // optimistically transfer tokens
            if (data.length > 0) IUniswapV2Callee(to).uniswapV2Call(msg.sender, amount0Out, amount1Out, data);
            balance0 = IERC20(_token0).balanceOf(address(this));
            balance1 = IERC20(_token1).balanceOf(address(this));
        }
        uint256 amount0In = balance0 > _reserve0 - amount0Out ? balance0 - (_reserve0 - amount0Out) : 0;
        uint256 amount1In = balance1 > _reserve1 - amount1Out ? balance1 - (_reserve1 - amount1Out) : 0;
        require(amount0In > 0 || amount1In > 0, "Xp: INSUFFICIENT_INPUT_AMOUNT");
        {
            require(balance0 * balance1 >= reserve0 * reserve1, "K");
        }

        _update(balance0, balance1, _reserve0, _reserve1);
        emit Swap(msg.sender, amount0In, amount1In, amount0Out, amount1Out, to);
    }

    // force balances to match reserves
    function skim(address to) external lock {
        address _token0 = token0; // gas savings
        address _token1 = token1; // gas savings
        _safeTransfer(_token0, to, IERC20(_token0).balanceOf(address(this)).sub(reserve0));
        _safeTransfer(_token1, to, IERC20(_token1).balanceOf(address(this)).sub(reserve1));
    }

    // force reserves to match balances
    function sync() external lock {
        _update(IERC20(token0).balanceOf(address(this)), IERC20(token1).balanceOf(address(this)), reserve0, reserve1);
    }
}

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

Contract Security Audit

Contract ABI

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Deployed Bytecode

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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.