Contract 0x781f65cfe948e376bc915336fa0da2140c2713dc

Txn Hash Method
Block
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Value [Txn Fee]
0xe161dcfd82ddc71f6c67df07384055332cb92b4777f0daacdfcf5043d647c7aeTransfer64473162023-01-11 21:23:2724 days 6 hrs ago0x55cb1bbf36bb02ad750278ab8ff39417afe58a3e IN  0x781f65cfe948e376bc915336fa0da2140c2713dc0 CRO0.213672667063 4,836.849580401
0x2d7637eab5975f4ffb2341a30447652ae7e61ea13a3962e0521911c8f8ca5790Approve52744092022-10-26 22:27:14101 days 5 hrs ago0xbda3d0b23f0c704b805a693c580331b59bf89d7f IN  0x781f65cfe948e376bc915336fa0da2140c2713dc0 CRO0.11314301475 4,889.288049358
0xea03bdf4ff1ba146d724c798cd01442738a64d25d90de4ea214e8ad6ef3bb4e6Transfer26717322022-05-08 8:37:57272 days 19 hrs ago0xf819ae20e48a140ed9bf01493a0b1174e853b937 IN  0x781f65cfe948e376bc915336fa0da2140c2713dc0 CRO0.201040
0x837825a94f74c094ec4e39ff8de8bd21e2d174a9dd484e0a05658edaa68384bbApprove25876702022-05-02 13:04:25278 days 15 hrs ago0x8908195c06508c9cb1b10134fb6f70a1a818db05 IN  0x781f65cfe948e376bc915336fa0da2140c2713dc0 CRO0.221550
0xdd77e1c95d78b7fa299b8805d6bd648122f7bf3bc623b8cdd1041f05d1476017Approve25709482022-05-01 9:06:36279 days 18 hrs ago0x7fd57cfeb265841044585f57c11df7a948fb2997 IN  0x781f65cfe948e376bc915336fa0da2140c2713dc0 CRO0.221550
0xd2b0a5f8cfa8ca25b0719eaaaaf896481d88f45a92f72eaa67d79a7a4f429910Approve25493872022-04-29 21:11:11281 days 6 hrs ago0x2ebb98c4c32a32ddb67a34c73d1dc5fa67d6e025 IN  0x781f65cfe948e376bc915336fa0da2140c2713dc0 CRO0.221550
0x93a1f6d777b214396bd4c5e6f614f7455d7285916191eb65da988c3a14f92a0dApprove25457322022-04-29 14:20:43281 days 13 hrs ago0x592e1e16016c25651513591b7ebed5ca803ad39e IN  0x781f65cfe948e376bc915336fa0da2140c2713dc0 CRO0.221550
0x6657f016f905729f96057981e96d5b775ab3fcf44c96b75e21ca34dd4f5272e7Approve24925532022-04-25 17:51:59285 days 10 hrs ago0xb5173937e7598db8f6e94b3a28fe21d9e8aec8d9 IN  0x781f65cfe948e376bc915336fa0da2140c2713dc0 CRO0.221550
0x989e62b24c2711a86bbc83beae6b56b20f4d6ef2a56872a782dec5c1c83cb39fApprove24850262022-04-25 4:59:53285 days 23 hrs ago0x3d6ea57f009813b5ad45854741be50f58837bc6b IN  0x781f65cfe948e376bc915336fa0da2140c2713dc0 CRO0.221550
0x5a8d0d9610b96221b72a1820268aeb69397d07f2f18e622ba7c229e7ff13199bTransfer24793092022-04-24 19:14:50286 days 8 hrs ago0xd5aa05d319ad96e832e600561c9e17707f484c4d IN  0x781f65cfe948e376bc915336fa0da2140c2713dc0 CRO0.20110
0x8ac1e7e1578d53196057b733b0a5631bda1bcc4a6abd7b4da171235580c857fcApprove24487772022-04-22 14:24:45288 days 13 hrs ago0xd7cfb60bc789fdb6122f0aba7b24997b460c4a36 IN  0x781f65cfe948e376bc915336fa0da2140c2713dc0 CRO0.0723150
0xb4c5bf4e48e7189b9297cdaeddd186088f8f3b0c27c560e1b2e82e074932377fApprove24301102022-04-21 6:30:37289 days 21 hrs ago0xf7d6612a89b58d6156a2bffb88dd5de7ecabe969 IN  0x781f65cfe948e376bc915336fa0da2140c2713dc0 CRO0.221550
0x1b2ba3efe19c0a369e1c93baab5212760e80e728ac7ff6e6a9ae025a3bdc25efApprove24020772022-04-19 5:01:37291 days 23 hrs ago0x4532280a66a0c1c709f7e0c40b14b4dea83253c1 IN  0x781f65cfe948e376bc915336fa0da2140c2713dc0 CRO0.2215500000540
0x14237bbfdd26dedd4901286b703f4983b72b133cac35d68b62ac9dba90a81d8eApprove23862542022-04-18 1:36:25293 days 2 hrs ago0x46089ea60b43e79b269f5213b4a4b1f52ddbe368 IN  0x781f65cfe948e376bc915336fa0da2140c2713dc0 CRO0.221550
0xceda99f3396ec365245cd6b003ce1ae7cad20e6207d3fdaa19099b0f06c19e83Approve23836272022-04-17 21:10:34293 days 6 hrs ago0x014a8ddd538b86ad330d17164434cdfcf878b271 IN  0x781f65cfe948e376bc915336fa0da2140c2713dc0 CRO0.221550
0x6e00873547c801031bd2e7838d3d1e7f056e9eed07742152a15620cac7ccbbe4Approve23622952022-04-16 8:25:08294 days 19 hrs ago0x9e8943db7a1c9caf39419b1c89fbfea520b9ed5f IN  0x781f65cfe948e376bc915336fa0da2140c2713dc0 CRO0.221550
0x690cd7f920eac819e012525075711114b98bd8336d1f79cf043927eef5022f5cApprove23572802022-04-15 23:57:28295 days 4 hrs ago0x66a3b5d796b8ddbf5ebe0ce1888391f2386d50fb IN  0x781f65cfe948e376bc915336fa0da2140c2713dc0 CRO0.221550
0xc3a853b1913df897d95b2568960e2bfe7ef2e2fd647733afd303ca47b77605f0Approve23550452022-04-15 20:09:26295 days 7 hrs ago0x43cc5f98a58cf1d968b80c12fdc9aa5462b9d05d IN  0x781f65cfe948e376bc915336fa0da2140c2713dc0 CRO0.221550
0x0ff9863b23dcd38a89e9a7f89037026d91375ef95743848cee8e50deb4aa90dbApprove23543902022-04-15 19:02:16295 days 9 hrs ago0xcd251d9de41cf7fc8c953a06bb9d4e269ec88479 IN  0x781f65cfe948e376bc915336fa0da2140c2713dc0 CRO0.221550
0xe5fdfb3c21d07c4b5f3c1c2610f53b9b7b2880247513b15db7df029e79720a44Approve23493912022-04-15 10:22:07295 days 17 hrs ago0xb5173937e7598db8f6e94b3a28fe21d9e8aec8d9 IN  0x781f65cfe948e376bc915336fa0da2140c2713dc0 CRO0.0723150
0xf5bddf567db9e4dd0bc4e317d31d240c93f2f9d0e20e94a2858ed3e94d18d28dApprove23493592022-04-15 10:18:57295 days 17 hrs ago0xb5173937e7598db8f6e94b3a28fe21d9e8aec8d9 IN  0x781f65cfe948e376bc915336fa0da2140c2713dc0 CRO0.221550
0x39a0a0b2354d1ae08f0a41baa260c4c81b3b357d634b5bcdb3a370cd8fd07529Approve23486532022-04-15 9:07:04295 days 18 hrs ago0xe707f25ad756548ef5a10c574d49c2fe4c09217f IN  0x781f65cfe948e376bc915336fa0da2140c2713dc0 CRO0.221550
0x8dc247bff26b126cc2e602ffca566fe7b76fdf8c16bd98d13cf0b91ce82a03d9Approve23484582022-04-15 8:42:27295 days 19 hrs ago0xf819ae20e48a140ed9bf01493a0b1174e853b937 IN  0x781f65cfe948e376bc915336fa0da2140c2713dc0 CRO0.221550
0x076bdaa464e7c977e4e510bd1f2c2ecaa4c1d500bc50321e577d67091c4e9beaApprove23443622022-04-15 1:41:11296 days 2 hrs ago0xed90f5a71b8f74978021de414f64436b3aff9a14 IN  0x781f65cfe948e376bc915336fa0da2140c2713dc0 CRO0.221550
0x7bd172c6fd72c13886b4ccfd10c96d6e9919c8228238fd6cda284d23c2603982Approve23432842022-04-14 23:51:59296 days 4 hrs ago0xd8a476600c6df8ce5288a5cd2588b97a80cd3e37 IN  0x781f65cfe948e376bc915336fa0da2140c2713dc0 CRO0.221550
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0x15b25e52458932b2a7a7116be683221fc77940889ef296747543f2c7ed864b3022680862022-04-09 8:25:17301 days 19 hrs ago 0xeea0e2830d09d8786cb9f484ca20898b61819ef1  Contract Creation0 CRO
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Similar Match Source Code
Note: This contract matches the deployed ByteCode of the Source Code for Contract 0x8a01774BF0622cB45b207Bf2BAf0d694300DAC60

Contract Name:
ElkPair

Compiler Version
v0.5.16+commit.9c3226ce

Optimization Enabled:
Yes with 1000 runs

Other Settings:
default evmVersion, MIT license

Contract Source Code (Solidity)

/**
 *Submitted for verification at cronoscan.com on 2022-05-09
*/

// Sources flattened with hardhat v2.0.6 https://hardhat.org

// File contracts/elk-core/interfaces/IElkFactory.sol

pragma solidity >=0.5.0;

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

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

    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;
}


// File contracts/elk-core/interfaces/IElkPair.sol

pragma solidity >=0.5.0;

interface IElkPair {
    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 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;
}


// File contracts/elk-core/interfaces/IElkERC20.sol

pragma solidity >=0.5.0;

interface IElkERC20 {
    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 contracts/elk-core/libraries/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');
    }
}


// File contracts/elk-core/ElkERC20.sol

pragma solidity =0.5.16;


contract ElkERC20 is IElkERC20 {
    using SafeMath for uint;

    string public constant name = 'Elk Liquidity';
    string public constant symbol = 'ELP';
    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, 'Elk: 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, 'Elk: INVALID_SIGNATURE');
        _approve(owner, spender, value);
    }
}


// File contracts/elk-core/libraries/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 contracts/elk-core/libraries/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 contracts/elk-core/interfaces/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 contracts/elk-core/interfaces/IElkCallee.sol

pragma solidity >=0.5.0;

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


// File contracts/elk-core/ElkPair.sol

pragma solidity =0.5.16;







contract ElkPair is IElkPair, ElkERC20 {
    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

    uint private unlocked = 1;
    modifier lock() {
        require(unlocked == 1, 'Elk: 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))), 'Elk: 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, 'Elk: FORBIDDEN'); // sufficient check
        token0 = _token0;
        token1 = _token1;
    }

    // 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), 'Elk: 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);
    }

    // if fee is on, mint liquidity equivalent to 1/6th of the growth in sqrt(k)
    function _mintFee(uint112 _reserve0, uint112 _reserve1) private returns (bool feeOn) {
        address feeTo = IElkFactory(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));
                    uint denominator = rootK.mul(5).add(rootKLast);
                    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, 'Elk: 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, 'Elk: 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, 'Elk: INSUFFICIENT_OUTPUT_AMOUNT');
        (uint112 _reserve0, uint112 _reserve1,) = getReserves(); // gas savings
        require(amount0Out < _reserve0 && amount1Out < _reserve1, 'Elk: 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, 'Elk: 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) IElkCallee(to).elkCall(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, 'Elk: INSUFFICIENT_INPUT_AMOUNT');
        { // scope for reserve{0,1}Adjusted, avoids stack too deep errors
        uint balance0Adjusted = balance0.mul(1000).sub(amount0In.mul(3));
        uint balance1Adjusted = balance1.mul(1000).sub(amount1In.mul(3));
        require(balance0Adjusted.mul(balance1Adjusted) >= uint(_reserve0).mul(_reserve1).mul(1000**2), 'Elk: 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);
    }
}

Contract ABI

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Swarm Source

bzzr://8309ae951979e3426b1a1e83083843a8ccc0cd0e8c253bf3a6dfe34ad109488b
Block Transaction Gas Used Reward
Age Block Fee Address BC Fee Address Voting Power Jailed Incoming
Block Uncle Number Difficulty Gas Used Reward
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