Contract 0xfe6379509c7134429f7b0aefdda6f2b74d82b6bc 1

Txn Hash Method
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Value [Txn Fee]
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0xb8eafdc387fac21f53e7da0d17ac374ee68aa7f15ce08504d51b2988f96b256bApprove36126082022-07-09 17:36:19213 days 3 hrs ago0xb19508b1b9e1f8b13ed282c66469b6cb2b858b3b IN  0xfe6379509c7134429f7b0aefdda6f2b74d82b6bc0 CRO0.11496181296 4,967.884402601
0x53e44023f9bd995e414d367588b75795b4627e87a0f933c0885dd6b6d420aed1Approve35221012022-07-03 18:25:27219 days 2 hrs ago0xa99fdbb3189c26c727af3fbab2a222ac1a4cd1d7 IN  0xfe6379509c7134429f7b0aefdda6f2b74d82b6bc0 CRO0.1228684568740
0x52730a0344ea74487a7e872f1740fa229f968382f990efcf5cdcdd2c7826e306Approve35216322022-07-03 17:40:51219 days 3 hrs ago0xa99fdbb3189c26c727af3fbab2a222ac1a4cd1d7 IN  0xfe6379509c7134429f7b0aefdda6f2b74d82b6bc0 CRO0.115050559832 4,971.719451735
0xece9f1fef29629477b2dc2f9fcc04be42ffa89d1d110b8d27c2a5c2912569227Approve28286582022-05-18 22:36:30264 days 22 hrs ago0x4a66fd2cff9549149d8d6bd0470341690883d7bd IN  0xfe6379509c7134429f7b0aefdda6f2b74d82b6bc0 CRO0.115677832428 4,998.825998385
0x398a84ce2473752d8a94d541b3edd7f7da32bb364cbd7847dfa28b1cbf5e0c80Transfer24790722022-04-24 18:50:25289 days 2 hrs ago0x02f927ffc747cec79c7681b6f620c0b9015e4235 IN  0xfe6379509c7134429f7b0aefdda6f2b74d82b6bc0 CRO0.201040
0xe19d48a1435d84527f7ed8c0a4a7bc206821d37da65cb8c59373770c420b9e75Approve24682912022-04-24 0:29:01289 days 20 hrs ago0xfa50cde7debc6d7e1a75a49a5d854f1f77fd7f01 IN  0xfe6379509c7134429f7b0aefdda6f2b74d82b6bc0 CRO0.0723150
0x3274b949c8c7ad3d0ee6cc83707993f5c1ce21e4ea57726102a2636b4345e61dApprove24682902022-04-24 0:28:54289 days 20 hrs ago0xfa50cde7debc6d7e1a75a49a5d854f1f77fd7f01 IN  0xfe6379509c7134429f7b0aefdda6f2b74d82b6bc0 CRO0.0723150
0x248b67bf2d9bebac78439e414c65c5f7be9ca43d57c7f864069c6bb1075ea8fbApprove24682902022-04-24 0:28:54289 days 20 hrs ago0xfa50cde7debc6d7e1a75a49a5d854f1f77fd7f01 IN  0xfe6379509c7134429f7b0aefdda6f2b74d82b6bc0 CRO0.0723150
0x3076a62f3c275c698700417a73b20ff989aa16b26fb04474cbbc6b93f5a1753dApprove24077212022-04-19 14:55:33294 days 5 hrs ago0x0089483de452d8ce338b25a5d44119387d92cd81 IN  0xfe6379509c7134429f7b0aefdda6f2b74d82b6bc0 CRO0.221550
0x3eb4765f654895fc8d226722f08a10b6a41260c1cfa122d31a3835e32fb080aaApprove24037632022-04-19 7:53:02294 days 13 hrs ago0x4fb33b1faeef3d6d34e5293656cde13360c00bca IN  0xfe6379509c7134429f7b0aefdda6f2b74d82b6bc0 CRO0.221550
0xa8dfe839a7c5c08164748377c7490a19c53902aea0d5bfe472a016f66552f072Approve23703672022-04-16 22:36:22296 days 22 hrs ago0x4313e9bf61bb2c5255badc9877d0344e3cf2c5ff IN  0xfe6379509c7134429f7b0aefdda6f2b74d82b6bc0 CRO0.125550
0x77c5b3e621d8520236a469843ef249a33e7266730edf00b9f4533b728d8253edApprove23703632022-04-16 22:35:58296 days 22 hrs ago0x4313e9bf61bb2c5255badc9877d0344e3cf2c5ff IN  0xfe6379509c7134429f7b0aefdda6f2b74d82b6bc0 CRO0.221550
0x85557f1b2a2286b9ee344252668b7b866a2125e4ddfc62e0517aa99ac1f66d63Approve23634742022-04-16 10:24:21297 days 10 hrs ago0xf4042be922d44b2299e6c71dcca26982c45778e1 IN  0xfe6379509c7134429f7b0aefdda6f2b74d82b6bc0 CRO0.221550
0x611758686fd38effebdde6e95e7e6c03bf173885c4b4b5c46d0e6f641f24a35fApprove23629502022-04-16 9:31:51297 days 11 hrs ago0xe05f2018f8d1582566ea85a7b170c673c813fe23 IN  0xfe6379509c7134429f7b0aefdda6f2b74d82b6bc0 CRO0.221550
0x3e3fc6eee9896226dce21737777526cff276804e8551481c22507cdfba53a0c3Approve23593642022-04-16 3:25:29297 days 17 hrs ago0xda57c7757c515c111a735b75001a5afef21e9ce0 IN  0xfe6379509c7134429f7b0aefdda6f2b74d82b6bc0 CRO0.221550
0x681299967a4fe0faec82d22b3ac49499283bbd70905d43421093d9afdbd30d55Approve23564632022-04-15 22:35:11297 days 22 hrs ago0x36e272fa836115837b1dce51fbd8f273f7d839d3 IN  0xfe6379509c7134429f7b0aefdda6f2b74d82b6bc0 CRO0.221550
0x8f1e966b20769838f277b358b02be1ca2e5004e3ce05cc6f9d82d2d7b9bbcb53Approve23406872022-04-14 19:27:57299 days 1 hr ago0xc699f8d7967a895efcbec1fcb738ef2103999f83 IN  0xfe6379509c7134429f7b0aefdda6f2b74d82b6bc0 CRO0.221550
0x19a0e87031e2b1fd1479449ab26c67222481c70d94a6bc97535aef8b6870e521Transfer23282732022-04-13 21:34:09299 days 23 hrs ago0x862606a6012fa68019ee26ce4a3b35bc2684beb4 IN  0xfe6379509c7134429f7b0aefdda6f2b74d82b6bc0 CRO0.238110
0x8819456df07847e573b7caa3534adf501662e780f4a42176cfa74b8e11ae317fTransfer23282622022-04-13 21:33:06299 days 23 hrs ago0x862606a6012fa68019ee26ce4a3b35bc2684beb4 IN  0xfe6379509c7134429f7b0aefdda6f2b74d82b6bc0 CRO0.238110
0xcce6640e7888631880618085f6d4f849f584352f15d792e37ff3592bbb5ff366Transfer22877622022-04-10 22:00:11302 days 22 hrs ago0x245464bd0cf395488cda3248c0ca11f8f49cf5d2 IN  0xfe6379509c7134429f7b0aefdda6f2b74d82b6bc0 CRO0.201280
0xdd60fdcfbbb52daffab73eeb636d0811e6200101702f98e6b6954e691cba9ddaTransfer22762642022-04-09 23:35:30303 days 21 hrs ago0x02f927ffc747cec79c7681b6f620c0b9015e4235 IN  0xfe6379509c7134429f7b0aefdda6f2b74d82b6bc0 CRO0.201340
0x08544d374763c8841d7975a104f5f870ef1ffdd5b83ae5983e1030fea2393cd1Approve22670242022-04-09 6:36:23304 days 14 hrs ago0x9ec7207f9164f6f9265d555c3f5a28cfda98043b IN  0xfe6379509c7134429f7b0aefdda6f2b74d82b6bc0 CRO0.221550
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0xd01a676e014e741142e6a8219828e5872f3754abcd4085c762b174c6f160e86292502021-11-08 15:14:37456 days 5 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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