Contract 0xfe6379509c7134429f7b0aefdda6f2b74d82b6bc 1

Txn Hash Method
Block
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Value [Txn Fee]
0x302d94e1565edfdebcd4bcd899071c35c087874893c1d4cfd3263b9c89ade76fApprove125466922024-02-13 23:47:1443 days 20 hrs ago0xbf010598b26cc6640c212ae417467018fae7bc61 IN  0xfe6379509c7134429f7b0aefdda6f2b74d82b6bc0 CRO0.24353001534 10,094.09
0xd806385ddd79d70c71828444efa3a4d9b4daff1e86d4c8a0b40a9554fbd77f89Approve76315142023-03-30 9:16:36364 days 10 hrs ago0x4a66fd2cff9549149d8d6bd0470341690883d7bd IN  0xfe6379509c7134429f7b0aefdda6f2b74d82b6bc0 CRO0.124911266693 4,781.109496046
0xc69614192255a0a2ba7558f1bf05f1fa08ca98d09e8d8bdd691417c7438531d4Approve59263842022-12-08 19:12:36476 days 59 mins agoCronos ID Name simadysam.cro IN  0xfe6379509c7134429f7b0aefdda6f2b74d82b6bc0 CRO0.1124516439710
0xfed9d71c5b94582851860d0b91498e834350bb563aa4be75dcc7eba399e57de1Approve59184642022-12-08 6:44:14476 days 13 hrs agoCronos ID Name simadysam.cro IN  0xfe6379509c7134429f7b0aefdda6f2b74d82b6bc0 CRO0.1201627801480
0xa5c83f5e00a231cfef471b95a05e86c1057b0dd8541d08dde8aa2b59c463f2c8Approve52743862022-10-26 22:25:04518 days 21 hrs ago0xbda3d0b23f0c704b805a693c580331b59bf89d7f IN  0xfe6379509c7134429f7b0aefdda6f2b74d82b6bc0 CRO0.11314304185 4,889.289220438
0xb8eafdc387fac21f53e7da0d17ac374ee68aa7f15ce08504d51b2988f96b256bApprove36126082022-07-09 17:36:19628 days 2 hrs ago0xb19508b1b9e1f8b13ed282c66469b6cb2b858b3b IN  0xfe6379509c7134429f7b0aefdda6f2b74d82b6bc0 CRO0.11496181296 4,967.884402601
0x53e44023f9bd995e414d367588b75795b4627e87a0f933c0885dd6b6d420aed1Approve35221012022-07-03 18:25:27634 days 1 hr agoCronos ID Name afasthero.cro IN  0xfe6379509c7134429f7b0aefdda6f2b74d82b6bc0 CRO0.1228684568740
0x52730a0344ea74487a7e872f1740fa229f968382f990efcf5cdcdd2c7826e306Approve35216322022-07-03 17:40:51634 days 2 hrs agoCronos ID Name afasthero.cro IN  0xfe6379509c7134429f7b0aefdda6f2b74d82b6bc0 CRO0.115050559832 4,971.719451735
0xece9f1fef29629477b2dc2f9fcc04be42ffa89d1d110b8d27c2a5c2912569227Approve28286582022-05-18 22:36:30679 days 21 hrs ago0x4a66fd2cff9549149d8d6bd0470341690883d7bd IN  0xfe6379509c7134429f7b0aefdda6f2b74d82b6bc0 CRO0.115677832428 4,998.825998385
0x398a84ce2473752d8a94d541b3edd7f7da32bb364cbd7847dfa28b1cbf5e0c80Transfer24790722022-04-24 18:50:25704 days 1 hr ago0x02f927ffc747cec79c7681b6f620c0b9015e4235 IN  0xfe6379509c7134429f7b0aefdda6f2b74d82b6bc0 CRO0.201040
0xe19d48a1435d84527f7ed8c0a4a7bc206821d37da65cb8c59373770c420b9e75Approve24682912022-04-24 0:29:01704 days 19 hrs ago0xfa50cde7debc6d7e1a75a49a5d854f1f77fd7f01 IN  0xfe6379509c7134429f7b0aefdda6f2b74d82b6bc0 CRO0.0723150
0x3274b949c8c7ad3d0ee6cc83707993f5c1ce21e4ea57726102a2636b4345e61dApprove24682902022-04-24 0:28:54704 days 19 hrs ago0xfa50cde7debc6d7e1a75a49a5d854f1f77fd7f01 IN  0xfe6379509c7134429f7b0aefdda6f2b74d82b6bc0 CRO0.0723150
0x248b67bf2d9bebac78439e414c65c5f7be9ca43d57c7f864069c6bb1075ea8fbApprove24682902022-04-24 0:28:54704 days 19 hrs ago0xfa50cde7debc6d7e1a75a49a5d854f1f77fd7f01 IN  0xfe6379509c7134429f7b0aefdda6f2b74d82b6bc0 CRO0.0723150
0x3076a62f3c275c698700417a73b20ff989aa16b26fb04474cbbc6b93f5a1753dApprove24077212022-04-19 14:55:33709 days 5 hrs ago0x0089483de452d8ce338b25a5d44119387d92cd81 IN  0xfe6379509c7134429f7b0aefdda6f2b74d82b6bc0 CRO0.221550
0x3eb4765f654895fc8d226722f08a10b6a41260c1cfa122d31a3835e32fb080aaApprove24037632022-04-19 7:53:02709 days 12 hrs ago0x4fb33b1faeef3d6d34e5293656cde13360c00bca IN  0xfe6379509c7134429f7b0aefdda6f2b74d82b6bc0 CRO0.221550
0xa8dfe839a7c5c08164748377c7490a19c53902aea0d5bfe472a016f66552f072Approve23703672022-04-16 22:36:22711 days 21 hrs ago0x4313e9bf61bb2c5255badc9877d0344e3cf2c5ff IN  0xfe6379509c7134429f7b0aefdda6f2b74d82b6bc0 CRO0.125550
0x77c5b3e621d8520236a469843ef249a33e7266730edf00b9f4533b728d8253edApprove23703632022-04-16 22:35:58711 days 21 hrs ago0x4313e9bf61bb2c5255badc9877d0344e3cf2c5ff IN  0xfe6379509c7134429f7b0aefdda6f2b74d82b6bc0 CRO0.221550
0x85557f1b2a2286b9ee344252668b7b866a2125e4ddfc62e0517aa99ac1f66d63Approve23634742022-04-16 10:24:21712 days 9 hrs ago0xf4042be922d44b2299e6c71dcca26982c45778e1 IN  0xfe6379509c7134429f7b0aefdda6f2b74d82b6bc0 CRO0.221550
0x611758686fd38effebdde6e95e7e6c03bf173885c4b4b5c46d0e6f641f24a35fApprove23629502022-04-16 9:31:51712 days 10 hrs ago0xe05f2018f8d1582566ea85a7b170c673c813fe23 IN  0xfe6379509c7134429f7b0aefdda6f2b74d82b6bc0 CRO0.221550
0x3e3fc6eee9896226dce21737777526cff276804e8551481c22507cdfba53a0c3Approve23593642022-04-16 3:25:29712 days 16 hrs ago0xda57c7757c515c111a735b75001a5afef21e9ce0 IN  0xfe6379509c7134429f7b0aefdda6f2b74d82b6bc0 CRO0.221550
0x681299967a4fe0faec82d22b3ac49499283bbd70905d43421093d9afdbd30d55Approve23564632022-04-15 22:35:11712 days 21 hrs ago0x36e272fa836115837b1dce51fbd8f273f7d839d3 IN  0xfe6379509c7134429f7b0aefdda6f2b74d82b6bc0 CRO0.221550
0x8f1e966b20769838f277b358b02be1ca2e5004e3ce05cc6f9d82d2d7b9bbcb53Approve23406872022-04-14 19:27:57714 days 43 mins ago0xc699f8d7967a895efcbec1fcb738ef2103999f83 IN  0xfe6379509c7134429f7b0aefdda6f2b74d82b6bc0 CRO0.221550
0x19a0e87031e2b1fd1479449ab26c67222481c70d94a6bc97535aef8b6870e521Transfer23282732022-04-13 21:34:09714 days 22 hrs ago0x862606a6012fa68019ee26ce4a3b35bc2684beb4 IN  0xfe6379509c7134429f7b0aefdda6f2b74d82b6bc0 CRO0.238110
0x8819456df07847e573b7caa3534adf501662e780f4a42176cfa74b8e11ae317fTransfer23282622022-04-13 21:33:06714 days 22 hrs ago0x862606a6012fa68019ee26ce4a3b35bc2684beb4 IN  0xfe6379509c7134429f7b0aefdda6f2b74d82b6bc0 CRO0.238110
0xcce6640e7888631880618085f6d4f849f584352f15d792e37ff3592bbb5ff366Transfer22877622022-04-10 22:00:11717 days 22 hrs ago0x245464bd0cf395488cda3248c0ca11f8f49cf5d2 IN  0xfe6379509c7134429f7b0aefdda6f2b74d82b6bc0 CRO0.201280
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0xd01a676e014e741142e6a8219828e5872f3754abcd4085c762b174c6f160e86292502021-11-08 15:14:37871 days 4 hrs ago 0xeea0e2830d09d8786cb9f484ca20898b61819ef1  Contract Creation0 CRO
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Similar Match Source Code
This contract matches the deployed Bytecode of the Source Code for Contract 0x8a01774BF0622cB45b207Bf2BAf0d694300DAC60
The constructor portion of the code might be different and could alter the actual behaviour of the contract

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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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":"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":"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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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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