Contract 0x3Fbd7DD99Ca32f98a56DDEE57B6b96e1152668F5

Contract Overview

Balance:
0 AVAX

AVAX Value:
$0.00

Token:
Txn Hash Method
Block
From
To
Value [Txn Fee]
0x4c397a2dd00c1f0eddb63aea8d52e5c87c09f3c91583ea8823ef3557ef1975faApprove28447312021-08-01 20:41:46329 days 36 mins ago0x3a9e0da873dbe52d7869e2fa76aeed965ffc01dc IN  0x3fbd7dd99ca32f98a56ddee57b6b96e1152668f50 AVAX0.01044225
0x71fc95b77ad39cfe6a4174d59acf64dff7d140fd04bac0d1efd654c590ee643bApprove25495322021-07-03 17:52:06358 days 3 hrs ago0x11b1785d9ac81480c03210e89f1508c8c115888e IN  0x3fbd7dd99ca32f98a56ddee57b6b96e1152668f50 AVAX0.00596475
0x482cf83af0cd3e5201eecf4d07356314d2dc39ed274a67600cc3abc76526c31cApprove25495252021-07-03 17:51:35358 days 3 hrs ago0x11b1785d9ac81480c03210e89f1508c8c115888e IN  0x3fbd7dd99ca32f98a56ddee57b6b96e1152668f50 AVAX0.01044225
0x4fc774124d3872f03856f180a8885f23e727643d344bae3e46110536ee731d6fApprove25153662021-06-30 1:32:29361 days 19 hrs ago0x58e6884f4c0c5f8114854ef7322b4cf03086f1fb IN  0x3fbd7dd99ca32f98a56ddee57b6b96e1152668f50 AVAX0.01044225
0x86881204790635840caaba9357a9b67176a752376955aa8f35359a8e7a38d49cApprove24036672021-06-21 14:28:51370 days 6 hrs ago0x15691e4db66dd8feeba5f32d0dce39e341359578 IN  0x3fbd7dd99ca32f98a56ddee57b6b96e1152668f50 AVAX0.01044225
0x071d9f4dcc86a7a64726e5017ba82244973a8999675b7e530a93a318f6dd23e0Approve24034982021-06-21 14:06:49370 days 7 hrs ago0xf662544be51cea0db3317f7e1a6df07a348c73af IN  0x3fbd7dd99ca32f98a56ddee57b6b96e1152668f50 AVAX0.01044225
0x52c79e9dfa22528d20ffa3ba7e9965c788515dd589a116e14b1b4f4222200eeaApprove24028302021-06-21 12:48:44370 days 8 hrs ago0xa7ad1d5a0dbd8928d9a5f7cf25f7434d701f6af2 IN  0x3fbd7dd99ca32f98a56ddee57b6b96e1152668f50 AVAX0.01044225
0x56fbc97017d444ae7ebb5f8b7eea90f3a7dfec2d9bad070e828c83f143f4124fApprove24020952021-06-21 11:25:44370 days 9 hrs ago0xba49776326a1ca54eb4f406c94ae4e1ebe458e19 IN  0x3fbd7dd99ca32f98a56ddee57b6b96e1152668f50 AVAX0.01044225
0xc34187cc22babcd2f42dcf37e7a458a113a390ca9377c9c87176150de656ed61Approve24011812021-06-21 10:04:34370 days 11 hrs ago0x4a90bf17f8d0591fab07827b80b54a2dfdf19198 IN  0x3fbd7dd99ca32f98a56ddee57b6b96e1152668f50 AVAX0.01044225
0x9d6220157945d8258f1ad8b1f112e55c2e476596c47f9b73b30f1e5d20679696Approve24000472021-06-21 8:11:49370 days 13 hrs ago0x47f40bfe57a4345d6352941f645bff2bb2c9825f IN  0x3fbd7dd99ca32f98a56ddee57b6b96e1152668f50 AVAX0.00596475
0x85f0796a7f36420e5aa166d5549b87bab1fbf97a83a181b7a87ec9c5d5a55a5dApprove24000452021-06-21 8:11:46370 days 13 hrs ago0x47f40bfe57a4345d6352941f645bff2bb2c9825f IN  0x3fbd7dd99ca32f98a56ddee57b6b96e1152668f50 AVAX0.01044225
0xa0c2428c01defb101e47a0c0a6e504a3947e1c954a8220cd3656e2eb72dfc8b1Approve23980122021-06-21 3:56:21370 days 17 hrs ago0x8181f49f1ae41d5801bb9239d2bec888e60f83df IN  0x3fbd7dd99ca32f98a56ddee57b6b96e1152668f50 AVAX0.01044225
0x65530031af624408ae8225e8697d5070649a25ceed1eee23413b34a32efb0912Approve23976602021-06-21 3:12:20370 days 18 hrs ago0xbb2d1be91975b3859caadc2b12d5315467dc1954 IN  0x3fbd7dd99ca32f98a56ddee57b6b96e1152668f50 AVAX0.01044225
0x565a4a668f731b693bd75ba99a8ce0587c769c5634dc313b894553295eed0adcApprove23436652021-06-16 3:26:01375 days 17 hrs ago0xb44cdaa4a6d40ca9ba821a34797ec60a5d7b5b8d IN  0x3fbd7dd99ca32f98a56ddee57b6b96e1152668f50 AVAX0.01044225
0x10f2c7e3231003f64e81013b7a269c0c8bdbcedf5f62307d5dc0221cc4d590e7Approve23214622021-06-14 9:48:25377 days 11 hrs ago0xb70ad7586134bfc9d70938ba44ca46039713990b IN  0x3fbd7dd99ca32f98a56ddee57b6b96e1152668f50 AVAX0.01044225
0x830aac2ac2366455397f7e9d82f28a96a0187fdec8d79aa96a7395a2dcdb20cfApprove22168912021-06-04 22:28:42386 days 22 hrs ago0xdb72cda0312928845ed33beca90bc3cfc2dd0449 IN  0x3fbd7dd99ca32f98a56ddee57b6b96e1152668f50 AVAX0.01044225
0x4698be53813cae455f2ff8604ec41603e194458568b4227aaffa094c40c592adApprove22148942021-06-04 18:44:05387 days 2 hrs ago0x433fc40f13267eeecf18a5b4f170bcec4020910e IN  0x3fbd7dd99ca32f98a56ddee57b6b96e1152668f50 AVAX0.00596475
0xe39dbe4bfa3341a1b25e6c63e90651babcb1e005d543d1ce38575fc04d81ff6cApprove22148852021-06-04 18:43:22387 days 2 hrs ago0x433fc40f13267eeecf18a5b4f170bcec4020910e IN  0x3fbd7dd99ca32f98a56ddee57b6b96e1152668f50 AVAX0.01044225
0xe107d4198e037db101b14e46cbd5d20ff46e59e0979498095b7917922010c679Approve22119062021-06-04 13:08:06387 days 8 hrs ago0x8c17c0ed36de902b44f0b613be0954d9013ebde0 IN  0x3fbd7dd99ca32f98a56ddee57b6b96e1152668f50 AVAX0.00596475
0x66eacad9cad539e8e2d72b4ffe6defc8ebbae6bf33d8da4e4984c602cb953c4aApprove22118992021-06-04 13:07:29387 days 8 hrs ago0x8c17c0ed36de902b44f0b613be0954d9013ebde0 IN  0x3fbd7dd99ca32f98a56ddee57b6b96e1152668f50 AVAX0.01044225
0xe9801333eafa82762af720eea7d84d83e5f0a5484f01464c3cf4a42054743270Approve22040042021-06-03 23:02:54387 days 22 hrs ago0x31f891cc9160342c0c0ddd3bccad4eca7078240c IN  0x3fbd7dd99ca32f98a56ddee57b6b96e1152668f50 AVAX0.01044225
0x51ba79e8ce80ef843e3776864f00f1aa0a2af4b104c7f5a03217ce3fcfc44781Approve22024022021-06-03 20:47:18388 days 30 mins ago0x29ca4d7c0ed4964c0530fceaff9ac943054e6c6f IN  0x3fbd7dd99ca32f98a56ddee57b6b96e1152668f50 AVAX0.01044225
0xcf4607eeb9eff8d1d3807cd90da77b41de5d1ad01a1f3cdf85c7b383b5ceac94Approve22004002021-06-03 17:41:13388 days 3 hrs ago0x14c6a01257ed005cb3fbc8cf30d4d97424f8aee9 IN  0x3fbd7dd99ca32f98a56ddee57b6b96e1152668f50 AVAX0.01044225
0x666e6c0eb255c7919886328b2ae0ec8207aa2f3e9559f2479b871514ca98a59fApprove21958272021-06-03 10:32:02388 days 10 hrs ago0x02e361a7bcf07d6de2bd57009a24190e76188b58 IN  0x3fbd7dd99ca32f98a56ddee57b6b96e1152668f50 AVAX0.01044225
0xc7eec4b75a80a591870013ca01d755c9c120ba5036d7a0911355759be7cc3ddeApprove21948532021-06-03 8:55:39388 days 12 hrs ago0x02e361a7bcf07d6de2bd57009a24190e76188b58 IN  0x3fbd7dd99ca32f98a56ddee57b6b96e1152668f50 AVAX0.01044225
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0x925aa12f0f03f9b10d5781559d874cbe0bbd64984dde9fd3101e2abf53f238306600722021-03-19 0:59:13464 days 20 hrs ago 0x091d35d7f63487909c863001ddca481c6de47091  Contract Creation0 AVAX
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Similar Match Source Code
Note: This contract matches the deployed ByteCode of the Source Code for Contract 0x2612dA8fc26Efbca3cC3F8fD543BCBa72b10aB59

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 snowtrace.io on 2021-11-16
*/

// 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);
    }
}


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

pragma solidity =0.5.16;


contract ElkFactory is IElkFactory {
    address public feeTo;
    address public feeToSetter;

    mapping(address => mapping(address => address)) public getPair;
    address[] public allPairs;

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

    constructor(address _feeToSetter) public {
        feeToSetter = _feeToSetter;
    }

    function allPairsLength() external view returns (uint) {
        return allPairs.length;
    }

    function createPair(address tokenA, address tokenB) external returns (address pair) {
        require(tokenA != tokenB, 'Elk: IDENTICAL_ADDRESSES');
        (address token0, address token1) = tokenA < tokenB ? (tokenA, tokenB) : (tokenB, tokenA);
        require(token0 != address(0), 'Elk: ZERO_ADDRESS');
        require(getPair[token0][token1] == address(0), 'Elk: PAIR_EXISTS'); // single check is sufficient
        bytes memory bytecode = type(ElkPair).creationCode;
        bytes32 salt = keccak256(abi.encodePacked(token0, token1));
        assembly {
            pair := create2(0, add(bytecode, 32), mload(bytecode), salt)
        }
        IElkPair(pair).initialize(token0, token1);
        getPair[token0][token1] = pair;
        getPair[token1][token0] = pair; // populate mapping in the reverse direction
        allPairs.push(pair);
        emit PairCreated(token0, token1, pair, allPairs.length);
    }

    function setFeeTo(address _feeTo) external {
        require(msg.sender == feeToSetter, 'Elk: FORBIDDEN');
        feeTo = _feeTo;
    }

    function setFeeToSetter(address _feeToSetter) external {
        require(msg.sender == feeToSetter, 'Elk: FORBIDDEN');
        feeToSetter = _feeToSetter;
    }
}

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://c7b8221695f6e1afec12c1d28217e23f2d542d8cf1385ea326b3d79004ea1007
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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