Contract 0xb965c131f1c48d89b1760860b782d2acdf87273b 1

 
 
Txn Hash Method
Block
From
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Value [Txn Fee]
0xc75dfbe2cacfbad203b99c4d135e776b6b62e246c6da270a271d8c0978ee61a2Approve361393942022-11-27 17:13:311 day 4 hrs ago0x484db2d3a8e83e9ca98fabb6f5aabaf1b503c77d IN  0xb965c131f1c48d89b1760860b782d2acdf87273b0 MATIC0.000870404716 36.077456533
0xe02af84c38c43175af77b0169d8f302a7f0ed71d143fb345165e6b3fe8ab4da5Approve361364162022-11-27 15:23:221 day 6 hrs ago0x8de70434138a8c84fe4e348c959cfe3d98f0758f IN  0xb965c131f1c48d89b1760860b782d2acdf87273b0 MATIC0.000997949908 38.197577461
0xdec57063e516adc61ac56ee94e3af8f4d32463a677de68024e41c75e2780e8faApprove361160132022-11-27 3:17:071 day 18 hrs ago0x88e4e664c3cbbf2ea175d49eff939c3dee893c5e IN  0xb965c131f1c48d89b1760860b782d2acdf87273b0 MATIC0.001606648909 34.618593179
0x278342a7dfa42da548d3f583257d486bcca061c349269c85a51be40161d628eeApprove359968032022-11-24 6:01:344 days 15 hrs ago0xde62711239bb1d0dcb92714ef13ccba04adea9d8 IN  0xb965c131f1c48d89b1760860b782d2acdf87273b0 MATIC0.0039765150
0xd548bd461ae58849349ec7de664f26b48990dd2e2b24379a73a1b7b734875aaaApprove359967972022-11-24 6:01:184 days 15 hrs ago0xde62711239bb1d0dcb92714ef13ccba04adea9d8 IN  0xb965c131f1c48d89b1760860b782d2acdf87273b0 MATIC0.0069615150
0x4c2936350d022c8a52c5d893bf2f0535dded2f40871292b120af7635325b9c78Approve357320472022-11-17 19:46:1811 days 2 hrs ago0x1f338a463fe5e90acec6ee5429c1748c34b25b7b IN  0xb965c131f1c48d89b1760860b782d2acdf87273b0 MATIC0.00076814531 31.838900364
0x1507b6c6cbab0a871f0ccffeabe1ab571a33bd1bdc1b67ec4f36a1bcd9247363Approve357319182022-11-17 19:41:5211 days 2 hrs ago0x1f338a463fe5e90acec6ee5429c1748c34b25b7b IN  0xb965c131f1c48d89b1760860b782d2acdf87273b0 MATIC0.000784544283 30.029253746
0x313a3841dddb11ebf064d1a139c52a821caedf78aa7f86ee84bc91ee15c222dcApprove355988142022-11-14 14:06:4314 days 7 hrs ago0xa4e6d5c8eb50e3878d7e60125545db9c41bcdfbe IN  0xb965c131f1c48d89b1760860b782d2acdf87273b0 MATIC0.003514894431 75.735712819
0x828cf3e4f50b884cb8e9766c71cb96b8dccf5f763ba45fa5daf1350c0945551dApprove354415312022-11-10 15:04:0618 days 6 hrs ago0x752ccffdb5b0cc8dad81d26642b78d6313a31ba0 IN  0xb965c131f1c48d89b1760860b782d2acdf87273b0 MATIC0.050917798071,097.129887329
0x7d0371b31a6d2bfb1ec65dc7a10b112ab8fe2f065857626ab0ff13644362482fApprove354045122022-11-09 17:41:0019 days 4 hrs ago0x1dad577819bbce4625d2fda4f169c326354f9478 IN  0xb965c131f1c48d89b1760860b782d2acdf87273b0 MATIC0.008492898838 325.074593846
0x0b15e56edadc35ae81822f7325c769f6898ea056800823f05dedfdf9fb106b22Approve354045002022-11-09 17:40:3619 days 4 hrs ago0x1dad577819bbce4625d2fda4f169c326354f9478 IN  0xb965c131f1c48d89b1760860b782d2acdf87273b0 MATIC0.008858823734 367.189908581
0x7e334ab9c388ee14d8cd13c9317f021ada2d582962ac4f1a80bde8118b76d11eApprove353758172022-11-09 0:53:1719 days 20 hrs ago0x499e934166a287ae3ca5001c6f141e91bb7e08c1 IN  0xb965c131f1c48d89b1760860b782d2acdf87273b0 MATIC0.003254371326 124.564469354
0x8f6092025b6dbaed27f9a62a1111968079ade4e2080bf49eeb91b6661edb0982Approve353757252022-11-09 0:50:0519 days 20 hrs ago0x499e934166a287ae3ca5001c6f141e91bb7e08c1 IN  0xb965c131f1c48d89b1760860b782d2acdf87273b0 MATIC0.007443270482 308.516558173
0xb7bc579fe17ddd33d9057cab31dd569c4ba8f89e0ba60b958bd74dee65c44da3Approve353620182022-11-08 16:52:1220 days 4 hrs ago0x5a075792f9848bf99d2033a01143c04f60c7643d IN  0xb965c131f1c48d89b1760860b782d2acdf87273b0 MATIC0.02132069078 816.071759169
0xe89c7f9e4f68ae95564cedaea9e4ae5dc04086568fb696c3ceec1d763e4ebbdcApprove353613572022-11-08 16:29:3020 days 5 hrs ago0x5a075792f9848bf99d2033a01143c04f60c7643d IN  0xb965c131f1c48d89b1760860b782d2acdf87273b0 MATIC0.02982203815 1,236.095421985
0xd0d7d32c8ca509747e86d160cf62dc07e8cf90753f1b140c249d95245867fd4aApprove353612642022-11-08 16:26:1620 days 5 hrs ago0x5a075792f9848bf99d2033a01143c04f60c7643d IN  0xb965c131f1c48d89b1760860b782d2acdf87273b0 MATIC0.043385110024 1,660.610503893
0x800479496de8da6cf1cc0dec1f9b227a5e2f5b4c913ec6178b45364711294d61Approve353612542022-11-08 16:25:5620 days 5 hrs ago0x5a075792f9848bf99d2033a01143c04f60c7643d IN  0xb965c131f1c48d89b1760860b782d2acdf87273b0 MATIC0.041507238996 1,720.43600252
0x971f0c37c6ef1b64527450ecb2a7c17a45cd1b11953185c826752d4ba267737fApprove353331762022-11-08 0:05:2420 days 21 hrs ago0x40bca75fbc6b7f9a67bc07f9617b564f3e832142 IN  0xb965c131f1c48d89b1760860b782d2acdf87273b0 MATIC0.0069615150
0xf5f0ef8c7c8e5312499952de7eb1da4dcc5188878d007d8d37cb5f9112a64da3Approve353318132022-11-07 23:14:4220 days 22 hrs ago0x8e95d467ba7e38cad3f5dad3118abd3237969504 IN  0xb965c131f1c48d89b1760860b782d2acdf87273b0 MATIC0.00628668293 240.62937037
0x6dddd04d17d69ab18d67a7492893ac283c64c5bb8af2a482e439bfd68a864880Approve353318022022-11-07 23:13:3620 days 22 hrs ago0x8e95d467ba7e38cad3f5dad3118abd3237969504 IN  0xb965c131f1c48d89b1760860b782d2acdf87273b0 MATIC0.005037619044 208.804569511
0x65f2da85959ba182d3d914c008e91a97cecc2e26ff38df05ae8d92e26db5c67dApprove353317992022-11-07 23:13:1820 days 22 hrs ago0x8e95d467ba7e38cad3f5dad3118abd3237969504 IN  0xb965c131f1c48d89b1760860b782d2acdf87273b0 MATIC0.004898688165 203.046015302
0x2796ab77e5f8d7ed80dec2e4561b9d6f5782663522c2a398e65f76c8eba95892Approve353273742022-11-07 20:28:5621 days 1 hr ago0x75917606594211491e933fa97098bbed26a535cd IN  0xb965c131f1c48d89b1760860b782d2acdf87273b0 MATIC0.0069615 150
0x9939671239924ceca0aa1573d64a096c9a762e1bd1ff309ba15662f792a8e5b2Approve353256922022-11-07 19:26:4821 days 2 hrs ago0xc928620f0aae35374794729c3e89d02ecc9facf2 IN  0xb965c131f1c48d89b1760860b782d2acdf87273b0 MATIC0.0069615150
0x44664d667ef3aa26258edbaa6d741fcc371ff1b9b4967083b5b49f16b79c801dApprove353011172022-11-07 5:01:5721 days 16 hrs ago0x85df0debb5758a2f282a1aace604ea0cd6337665 IN  0xb965c131f1c48d89b1760860b782d2acdf87273b0 MATIC0.002702112112
0xd450abef02dcecf179084d25ac6e22b6b5d096af925b47a9dbb0bcd7935b0b8eApprove352796312022-11-06 16:38:3022 days 5 hrs ago0x5323624ea7ef3fbab9139a746af659dc929af1c4 IN  0xb965c131f1c48d89b1760860b782d2acdf87273b0 MATIC0.003798059775 157.426004141
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0x4f8145f22ee974ce972bca8ce4153c5eaed98707ceae4a3c8e4e55deb4c1f76f328825282022-09-09 9:42:5280 days 12 hrs ago 0xf4a83f87fff92a684c9b66a0c22ac57b8d862d91 0xb965c131f1c48d89b1760860b782d2acdf87273b0.01 MATIC
0xe2a88c3773ebf13d15d8cb51d56aa408c1842e074cd695f978be490482c61285314163552022-08-02 2:17:12118 days 19 hrs ago 0x7cfb780010e9c861e03bcbc7ac12e013137d47a5  Contract Creation0 MATIC
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Similar Match Source Code
Note: This contract matches the deployed ByteCode of the Source Code for Contract 0xD15EB8710E28C23993968e671807d572189CC86e

Contract Name:
MeerkatPair

Compiler Version
v0.5.16+commit.9c3226ce

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion

Contract Source Code (Solidity Standard Json-Input format)

File 1 of 10 : MeerkatPair.sol
pragma solidity =0.5.16;

import './interfaces/IMeerkatPair.sol';
import './MeerkatERC20.sol';
import './libraries/Math.sol';
import './libraries/UQ112x112.sol';
import './interfaces/IERC20.sol';
import './interfaces/IMeerkatFactory.sol';
import './interfaces/IMeerkatCallee.sol';

contract MeerkatPair is IMeerkatPair, MeerkatERC20 {
    using SafeMath  for uint;
    using UQ112x112 for uint224;

    uint public constant MINIMUM_LIQUIDITY = 10**3;
    bytes4 private constant SELECTOR = bytes4(keccak256(bytes('transfer(address,uint256)')));

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

    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

    uint public price0CumulativeLast;
    uint public price1CumulativeLast;
    uint public kLast; // reserve0 * reserve1, as of immediately after the most recent liquidity event
    uint32 public swapFee = 17; // uses 0.17% default

    uint private unlocked = 1;
    modifier lock() {
        require(unlocked == 1, 'Meerkat: LOCKED');
        unlocked = 0;
        _;
        unlocked = 1;
    }

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

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

    event Mint(address indexed sender, uint amount0, uint amount1);
    event Burn(address indexed sender, uint amount0, uint amount1, address indexed to);
    event Swap(
        address indexed sender,
        uint amount0In,
        uint amount1In,
        uint amount0Out,
        uint 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, 'Meerkat: FORBIDDEN'); // sufficient check
        token0 = _token0;
        token1 = _token1;
    }

    function setSwapFee(uint32 _swapFee) external {
        require(_swapFee > 0, "MeerkatPair: lower then 0");
        require(msg.sender == factory, 'MeerkatPair: FORBIDDEN');
        require(_swapFee <= 1000, 'MeerkatPair: FORBIDDEN_FEE');
        swapFee = _swapFee;
    }

    // update reserves and, on the first call per block, price accumulators
    function _update(uint balance0, uint balance1, uint112 _reserve0, uint112 _reserve1) private {
        require(balance0 <= uint112(-1) && balance1 <= uint112(-1), 'Meerkat: 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 += uint(UQ112x112.encode(_reserve1).uqdiv(_reserve0)) * timeElapsed;
            price1CumulativeLast += uint(UQ112x112.encode(_reserve0).uqdiv(_reserve1)) * timeElapsed;
        }
        reserve0 = uint112(balance0);
        reserve1 = uint112(balance1);
        blockTimestampLast = blockTimestamp;
        emit Sync(reserve0, reserve1);
    }

    function _mintFee(uint112 _reserve0, uint112 _reserve1) private returns (bool feeOn) {
        address feeTo = IMeerkatFactory(factory).feeTo();
        feeOn = feeTo != address(0);
        uint _kLast = kLast; // gas savings
        if (feeOn) {
            if (_kLast != 0) {
                uint rootK = Math.sqrt(uint(_reserve0).mul(_reserve1));
                uint rootKLast = Math.sqrt(_kLast);
                if (rootK > rootKLast) {
                    uint numerator = totalSupply.mul(rootK.sub(rootKLast)).mul(2);
                    uint denominator = rootK.mul(3).add(rootKLast.mul(2));
                    uint 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 mint(address to) external lock returns (uint liquidity) {
        (uint112 _reserve0, uint112 _reserve1,) = getReserves(); // gas savings
        uint balance0 = IERC20(token0).balanceOf(address(this));
        uint balance1 = IERC20(token1).balanceOf(address(this));
        uint amount0 = balance0.sub(_reserve0);
        uint amount1 = balance1.sub(_reserve1);

        bool feeOn = _mintFee(_reserve0, _reserve1);
        uint _totalSupply = totalSupply; // gas savings, must be defined here since totalSupply can update in _mintFee
        if (_totalSupply == 0) {
            liquidity = Math.sqrt(amount0.mul(amount1)).sub(MINIMUM_LIQUIDITY);
           _mint(address(0), MINIMUM_LIQUIDITY); // permanently lock the first MINIMUM_LIQUIDITY tokens
        } else {
            liquidity = Math.min(amount0.mul(_totalSupply) / _reserve0, amount1.mul(_totalSupply) / _reserve1);
        }
        require(liquidity > 0, 'Meerkat: INSUFFICIENT_LIQUIDITY_MINTED');
        _mint(to, liquidity);

        _update(balance0, balance1, _reserve0, _reserve1);
        if (feeOn) kLast = uint(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 (uint amount0, uint amount1) {
        (uint112 _reserve0, uint112 _reserve1,) = getReserves(); // gas savings
        address _token0 = token0;                                // gas savings
        address _token1 = token1;                                // gas savings
        uint balance0 = IERC20(_token0).balanceOf(address(this));
        uint balance1 = IERC20(_token1).balanceOf(address(this));
        uint liquidity = balanceOf[address(this)];

        bool feeOn = _mintFee(_reserve0, _reserve1);
        uint _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, 'Meerkat: 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 = uint(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(uint amount0Out, uint amount1Out, address to, bytes calldata data) external lock {
        require(amount0Out > 0 || amount1Out > 0, 'Meerkat: INSUFFICIENT_OUTPUT_AMOUNT');
        (uint112 _reserve0, uint112 _reserve1,) = getReserves(); // gas savings
        require(amount0Out < _reserve0 && amount1Out < _reserve1, 'Meerkat: INSUFFICIENT_LIQUIDITY');

        uint balance0;
        uint balance1;
        { // scope for _token{0,1}, avoids stack too deep errors
        address _token0 = token0;
        address _token1 = token1;
        require(to != _token0 && to != _token1, 'Meerkat: 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) IMeerkatCallee(to).MeerkatCall(msg.sender, amount0Out, amount1Out, data);
        balance0 = IERC20(_token0).balanceOf(address(this));
        balance1 = IERC20(_token1).balanceOf(address(this));
        }
        uint amount0In = balance0 > _reserve0 - amount0Out ? balance0 - (_reserve0 - amount0Out) : 0;
        uint amount1In = balance1 > _reserve1 - amount1Out ? balance1 - (_reserve1 - amount1Out) : 0;
        require(amount0In > 0 || amount1In > 0, 'Meerkat: INSUFFICIENT_INPUT_AMOUNT');
        { // scope for reserve{0,1}Adjusted, avoids stack too deep errors
        uint _swapFee = swapFee;
        uint balance0Adjusted = (balance0.mul(10000).sub(amount0In.mul(_swapFee)));
        uint balance1Adjusted = (balance1.mul(10000).sub(amount1In.mul(_swapFee)));
        require(balance0Adjusted.mul(balance1Adjusted) >= uint(_reserve0).mul(_reserve1).mul(10000**2), 'Meerkat: 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);
    }
}

File 2 of 10 : IMeerkatPair.sol
pragma solidity >=0.5.0;

interface IMeerkatPair {
    event Approval(address indexed owner, address indexed spender, uint value);
    event Transfer(address indexed from, address indexed to, uint 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 (uint);
    function balanceOf(address owner) external view returns (uint);
    function allowance(address owner, address spender) external view returns (uint);

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

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

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

    function MINIMUM_LIQUIDITY() external pure returns (uint);
    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 (uint);
    function price1CumulativeLast() external view returns (uint);
    function kLast() external view returns (uint);
    function swapFee() external view returns (uint32);

    function mint(address to) external returns (uint liquidity);
    function burn(address to) external returns (uint amount0, uint amount1);
    function swap(uint amount0Out, uint amount1Out, address to, bytes calldata data) external;
    function skim(address to) external;
    function sync() external;

    function initialize(address, address) external;
    function setSwapFee(uint32) external;
}

File 3 of 10 : MeerkatERC20.sol
pragma solidity =0.5.16;

import './interfaces/IMeerkatERC20.sol';
import './libraries/SafeMath.sol';

contract MeerkatERC20 is IMeerkatERC20 {
    using SafeMath for uint;

    string public constant name = 'Meerkat LPs';
    string public constant symbol = 'MEERKAT-LP';
    uint8 public constant decimals = 18;
    uint  public totalSupply;
    mapping(address => uint) public balanceOf;
    mapping(address => mapping(address => uint)) 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 => uint) public nonces;

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

    constructor() public {
        uint chainId;
        assembly {
            chainId := chainid
        }
        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, uint value) internal {
        totalSupply = totalSupply.add(value);
        balanceOf[to] = balanceOf[to].add(value);
        emit Transfer(address(0), to, value);
    }

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

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

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

    function approve(address spender, uint value) external returns (bool) {
        _approve(msg.sender, spender, value);
        return true;
    }

    function transfer(address to, uint value) external returns (bool) {
        _transfer(msg.sender, to, value);
        return true;
    }

    function transferFrom(address from, address to, uint value) external returns (bool) {
        if (allowance[from][msg.sender] != uint(-1)) {
            allowance[from][msg.sender] = allowance[from][msg.sender].sub(value);
        }
        _transfer(from, to, value);
        return true;
    }

    function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external {
        require(deadline >= block.timestamp, 'Meerkat: EXPIRED');
        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, 'Meerkat: INVALID_SIGNATURE');
        _approve(owner, spender, value);
    }
}

File 4 of 10 : Math.sol
pragma solidity =0.5.16;

// a library for performing various math operations

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

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

File 5 of 10 : UQ112x112.sol
pragma solidity =0.5.16;

// a library for handling binary fixed point numbers (https://en.wikipedia.org/wiki/Q_(number_format))

// range: [0, 2**112 - 1]
// resolution: 1 / 2**112

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);
    }
}

File 6 of 10 : IERC20.sol
pragma solidity >=0.5.0;

interface IERC20 {
    event Approval(address indexed owner, address indexed spender, uint value);
    event Transfer(address indexed from, address indexed to, uint 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 (uint);
    function balanceOf(address owner) external view returns (uint);
    function allowance(address owner, address spender) external view returns (uint);

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

File 7 of 10 : IMeerkatFactory.sol
pragma solidity >=0.5.0;

interface IMeerkatFactory {
    event PairCreated(address indexed token0, address indexed token1, address pair, uint);

    function feeTo() external view returns (address);
    function feeToSetter() external view returns (address);
    function INIT_CODE_HASH() external pure returns (bytes32);

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

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

    function setFeeTo(address) external;
    function setFeeToSetter(address) external;
    function setSwapFee(address pair, uint32 swapFee) external;
}

File 8 of 10 : IMeerkatCallee.sol
pragma solidity >=0.5.0;

interface IMeerkatCallee {
    function MeerkatCall(address sender, uint amount0, uint amount1, bytes calldata data) external;
}

File 9 of 10 : IMeerkatERC20.sol
pragma solidity >=0.5.0;

interface IMeerkatERC20 {
    event Approval(address indexed owner, address indexed spender, uint value);
    event Transfer(address indexed from, address indexed to, uint 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 (uint);
    function balanceOf(address owner) external view returns (uint);
    function allowance(address owner, address spender) external view returns (uint);

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

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

File 10 of 10 : SafeMath.sol
pragma solidity =0.5.16;

// a library for performing overflow-safe math, courtesy of DappHub (https://github.com/dapphub/ds-math)

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

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

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

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

Contract Security Audit

Contract ABI

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ion"},{"constant":true,"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"nonces","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"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":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"price0CumulativeLast","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"price1CumulativeLast","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"uint32","name":"_swapFee","type":"uint32"}],"name":"setSwapFee","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"to","type":"address"}],"name":"skim","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"uint256","name":"amount0Out","type":"uint256"},{"internalType":"uint256","name":"amount1Out","type":"uint256"},{"internalType":"address","name":"to","type":"address"},{"internalType":"bytes","name":"data","type":"bytes"}],"name":"swap","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"swapFee","outputs":[{"internalType":"uint32","name":"","type":"uint32"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"sync","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"token0","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"token1","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"}]

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