Contract 0xDB984fd8371d07db9cBf4A48Eb9676b09B12161D 1

 

Contract Overview

Balance:
0 BNB

BNB Value:
$0.00

Token:
 
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Block
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To
Value [Txn Fee]
0xb18b98a1e4e9203235e92a36df75e010488a1884b2cfb774bc073df534d182c9Create Pair93447482021-07-21 7:27:43186 days 19 hrs ago0x5a1e3d765bae1c290149c24a66a34c29c41e0a79 IN  0xdb984fd8371d07db9cbf4a48eb9676b09b12161d0 BNB0.010078085
0xaaaa5305282a972f17cce6a81879e5849997cd386421abe942f5166877a4c3d5Create Pair93169352021-07-20 8:16:43187 days 18 hrs ago0x5a1e3d765bae1c290149c24a66a34c29c41e0a79 IN  0xdb984fd8371d07db9cbf4a48eb9676b09b12161d0 BNB0.010078035
0xf310a03570b190fd9e8814fc785f4bbd53541a62a430780f2df44e20498206a9Create Pair93169052021-07-20 8:15:13187 days 18 hrs ago0x5a1e3d765bae1c290149c24a66a34c29c41e0a79 IN  0xdb984fd8371d07db9cbf4a48eb9676b09b12161d0 BNB0.010078035
0x78c9282f06318a2134a27cb16897039d60ebfdec680f153d25edb9f056a9f6b7Create Pair93168932021-07-20 8:14:37187 days 18 hrs ago0x5a1e3d765bae1c290149c24a66a34c29c41e0a79 IN  0xdb984fd8371d07db9cbf4a48eb9676b09b12161d0 BNB0.010078085
0x2c392199b5a969764043de7d852cc5d5e16f9f58c7bc61c93d46df4c7d1da757Create Pair93110172021-07-20 3:20:11187 days 23 hrs ago0x5a1e3d765bae1c290149c24a66a34c29c41e0a79 IN  0xdb984fd8371d07db9cbf4a48eb9676b09b12161d0 BNB0.010078085
0x8fe83cdeef41aadbd8cdfd7d2cbfee4e071283ad3beb64a4a90ea91ff168c58bSet Fee To92927712021-07-19 12:06:45188 days 14 hrs ago0x6940eba67a88906d56314f0ee609a50a66dcb2be IN  0xdb984fd8371d07db9cbf4a48eb9676b09b12161d0 BNB0.000217165
0x235ea5055e012d2d0c5f3974f67fbc4692f036e692aa6bf1ffb47b01147167dbCreate Pair92919382021-07-19 11:25:06188 days 15 hrs ago0x88e2ceef974b9c090ba5a03ff3a5a7781ca503ba IN  0xdb984fd8371d07db9cbf4a48eb9676b09b12161d0 BNB0.010249085
0xc7fc1d86ab26a04eb8330f8dd3c9a0bbfe04709cab5e13c3a06a6d5f3250fe660x6080604092919352021-07-19 11:24:57188 days 15 hrs ago0x88e2ceef974b9c090ba5a03ff3a5a7781ca503ba IN  Create: BoxswapFactory0 BNB0.012095905
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0xc0226503fe8515672dafbfe2b9e624c58192137da4a7052300dc5cb4318eda15127063952021-11-16 21:23:1068 days 5 hrs ago 0xdb984fd8371d07db9cbf4a48eb9676b09b12161d  Contract Creation0 BNB
0xc8ea0827db07dadd05565474ca61892b01a42a41affe3dff9346940f8673b2f7111124842021-09-21 16:27:46124 days 10 hrs ago 0xdb984fd8371d07db9cbf4a48eb9676b09b12161d  Contract Creation0 BNB
0xe3baad56dfbb8863dff581f9f8b837527f4dfa5690873bddc1fa4e88843a094a106797032021-09-06 13:24:27139 days 13 hrs ago 0xdb984fd8371d07db9cbf4a48eb9676b09b12161d  Contract Creation0 BNB
0x419c06cfec7d54be0c4afc788de35387158d021c1fc894e3d239f9c3f8ef6304103273382021-08-25 4:27:16151 days 22 hrs ago 0xdb984fd8371d07db9cbf4a48eb9676b09b12161d  Contract Creation0 BNB
0x94b91c3e0af75f643eb173f7c847e440654807cb8ffd100712d522f4906000e3100367022021-08-15 1:03:03162 days 1 hr ago 0xdb984fd8371d07db9cbf4a48eb9676b09b12161d  Contract Creation0 BNB
0xd13b28cefc0f9edb180dfa40ab0ed393c63827e5bdc3aba456696ba0a4f96b1399533972021-08-12 2:34:11165 days 20 mins ago 0xdb984fd8371d07db9cbf4a48eb9676b09b12161d  Contract Creation0 BNB
0x733da760995345447b1c9c63ce84d36cbcfc8c51f7e9e2f60f70c5ce42433b4a98767142021-08-09 8:53:34167 days 18 hrs ago 0xdb984fd8371d07db9cbf4a48eb9676b09b12161d  Contract Creation0 BNB
0xa63e43bbc1bd43733755199231b454311e22ac2437c35128622062c3038a707298465382021-08-08 7:03:11168 days 19 hrs ago 0xdb984fd8371d07db9cbf4a48eb9676b09b12161d  Contract Creation0 BNB
0x1e1da368fb28e845da81d04b5f760a48649436c0bbb6aa0fd62bfc7738e8644b97699402021-08-05 13:17:11171 days 13 hrs ago 0xdb984fd8371d07db9cbf4a48eb9676b09b12161d  Contract Creation0 BNB
0x9814950d017764fcac2c704767472bbdf19899f143c2a966df0579f5f858752f97367482021-08-04 8:48:03172 days 18 hrs ago 0xdb984fd8371d07db9cbf4a48eb9676b09b12161d  Contract Creation0 BNB
0x014d4fcbb67e3d5a4950fb83d83d7c272878e4d7a81b0fea352f74f3e841b85197367002021-08-04 8:45:31172 days 18 hrs ago 0xdb984fd8371d07db9cbf4a48eb9676b09b12161d  Contract Creation0 BNB
0x28e17e12fca844720673f7b88a5b29f4313d7ecb435ac334719861586bd2e3e597366282021-08-04 8:41:45172 days 18 hrs ago 0xdb984fd8371d07db9cbf4a48eb9676b09b12161d  Contract Creation0 BNB
0xd22e38e80a07331ba8168b6c1e8b00e038d6ad26439b0c41ce93b6bc8b03b31997363212021-08-04 8:25:45172 days 18 hrs ago 0xdb984fd8371d07db9cbf4a48eb9676b09b12161d  Contract Creation0 BNB
0xcd3543ca7480535f98fc846f6e86e2b5b6c052a370e7defe1e71da33ccf7fda397070492021-08-03 6:58:38173 days 19 hrs ago 0xdb984fd8371d07db9cbf4a48eb9676b09b12161d  Contract Creation0 BNB
0x648f889ec93a089e0bc5d367566aacdd1525dd6a57b72e12c1ce7f7420561e4d97069842021-08-03 6:55:06173 days 19 hrs ago 0xdb984fd8371d07db9cbf4a48eb9676b09b12161d  Contract Creation0 BNB
0xe1c77658c2976eb31e4cdcd4f3b41f36ac65503caee8fcc97a589e40ee42dfb396204312021-07-31 3:57:58176 days 22 hrs ago 0xdb984fd8371d07db9cbf4a48eb9676b09b12161d  Contract Creation0 BNB
0x08e8b5ec5350bc33d1a7e78ccf72d2b1ca66bcd7fa7670a52ec20bafeb05ce0195949812021-07-30 6:25:01177 days 20 hrs ago 0xdb984fd8371d07db9cbf4a48eb9676b09b12161d  Contract Creation0 BNB
0x8164f3d0bce123f053d46f72aa55344f30cb5e602eb908805b24ec8fdf26b82d94914482021-07-26 10:28:15181 days 16 hrs ago 0xdb984fd8371d07db9cbf4a48eb9676b09b12161d  Contract Creation0 BNB
0x7f41d9627da242142a6684f6171735ae9dc13eb477cc19b037ea1176ccdef22194377952021-07-24 13:12:37183 days 13 hrs ago 0xdb984fd8371d07db9cbf4a48eb9676b09b12161d  Contract Creation0 BNB
0xa983839b88589cc6bd6982e25d89c562b7ab00700f4fbfaa767ed5f47ee642e293730602021-07-22 7:03:58185 days 19 hrs ago 0xdb984fd8371d07db9cbf4a48eb9676b09b12161d  Contract Creation0 BNB
0x532097cc0c6249e4c85814a7c298f18380c91e4f83f02b7d5f72483062c43c8493711042021-07-22 5:26:10185 days 21 hrs ago 0xdb984fd8371d07db9cbf4a48eb9676b09b12161d  Contract Creation0 BNB
0xf53eee5f2c134459b8e5e63f02d25d0caf8d0931c24f3ba9b782beda7be1f5bd93669172021-07-22 1:56:49186 days 57 mins ago 0xdb984fd8371d07db9cbf4a48eb9676b09b12161d  Contract Creation0 BNB
0x2038369251c98c05494474fa72951952f72a6a9dd6e8e559e81dc2161bcd07ea93493472021-07-21 11:17:40186 days 15 hrs ago 0xdb984fd8371d07db9cbf4a48eb9676b09b12161d  Contract Creation0 BNB
0x268a360bac0c5c30191d07be1c507d6a97ee78337e7b191f532fa13dee1e729293492742021-07-21 11:14:01186 days 15 hrs ago 0xdb984fd8371d07db9cbf4a48eb9676b09b12161d  Contract Creation0 BNB
0xcc41a24ed78a627c9ced3d369febd719b58e3076a0af6a0341e1abf28b4deb7693492052021-07-21 11:10:34186 days 15 hrs ago 0xdb984fd8371d07db9cbf4a48eb9676b09b12161d  Contract Creation0 BNB
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Contract Source Code Verified (Exact Match)

Contract Name:
BoxswapFactory

Compiler Version
v0.5.16+commit.9c3226ce

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion, None license

Contract Source Code (Solidity)

/**
 *Submitted for verification at BscScan.com on 2021-07-20
*/

// SPDX-License-Identifier: NONE

pragma solidity 0.5.16;



// Part: IBoxswapCallee

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

// Part: IBoxswapERC20

interface IBoxswapERC20 {
    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;
}

// Part: IBoxswapFactory

interface IBoxswapFactory {
    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;
}

// Part: IBoxswapPair

interface IBoxswapPair {
    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, uint balance, uint liquidity);
    event Burn(address indexed sender, uint amount0, uint amount1, address indexed to, uint balance, uint liquidity);
    event Swap(
        address indexed sender,
        uint amount0In,
        uint amount1In,
        uint amount0Out,
        uint amount1Out,
        address indexed to
    );
    event Sync(uint112 reserve0, uint112 reserve1, uint totalSupply);

    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;
}

// Part: IERC20

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);
}

// Part: Math

// 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;
        }
    }
}

// Part: SafeMath

// 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');
    }
}

// Part: UQ112x112

// 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);
    }
}

// Part: BoxswapERC20

contract BoxswapERC20 is IBoxswapERC20 {
    using SafeMath for uint;

    string public constant name = 'Boxswap';
    string public constant symbol = 'Box';
    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, 'Boxswap: 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, 'Boxswap: INVALID_SIGNATURE');
        _approve(owner, spender, value);
    }
}

// Part: BoxswapPair

contract BoxswapPair is IBoxswapPair, BoxswapERC20 {
    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, 'Boxswap: 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))), 'Boxswap: TRANSFER_FAILED');
    }

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

    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, 'Boxswap: 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), 'Boxswap: 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, totalSupply);
    }

    // if fee is on, mint liquidity equivalent to 1/3th of the growth in sqrt(k)
    function _mintFee(uint112 _reserve0, uint112 _reserve1) private returns (bool feeOn) {
        address feeTo = IBoxswapFactory(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(2).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, 'Boxswap: 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
        uint balance = balanceOf[to];
        emit Mint(msg.sender, amount0, amount1, balance, liquidity);
    }

    // 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, 'Boxswap: 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
        uint balance = balanceOf[to];
        emit Burn(msg.sender, amount0, amount1, to, balance, liquidity);
    }

    // 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, 'Boxswap: INSUFFICIENT_OUTPUT_AMOUNT');
        (uint112 _reserve0, uint112 _reserve1,) = getReserves(); // gas savings
        require(amount0Out < _reserve0 && amount1Out < _reserve1, 'Boxswap: 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, 'Boxswap: 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) IBoxswapCallee(to).boxswapCall(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, 'Boxswap: 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), 'Boxswap: 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: BoxswapFactory_flat.sol

contract BoxswapFactory is IBoxswapFactory {
    address public feeTo;
    address public feeToSetter;
    bytes32 public codehash;
    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, 'Boxswap: IDENTICAL_ADDRESSES');
        (address token0, address token1) = tokenA < tokenB ? (tokenA, tokenB) : (tokenB, tokenA);
        require(token0 != address(0), 'Boxswap: ZERO_ADDRESS');
        require(getPair[token0][token1] == address(0), 'Boxswap: PAIR_EXISTS'); // single check is sufficient
        bytes memory bytecode = type(BoxswapPair).creationCode;
        codehash = keccak256(bytecode);
        bytes32 salt = keccak256(abi.encodePacked(token0, token1));
        assembly {
            pair := create2(0, add(bytecode, 32), mload(bytecode), salt)
        }
        IBoxswapPair(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, 'Boxswap: FORBIDDEN');
        feeTo = _feeTo;
    }

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

Contract Security Audit

Contract ABI

[{"inputs":[{"internalType":"address","name":"_feeToSetter","type":"address"}],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"token0","type":"address"},{"indexed":true,"internalType":"address","name":"token1","type":"address"},{"indexed":false,"internalType":"address","name":"pair","type":"address"},{"indexed":false,"internalType":"uint256","name":"","type":"uint256"}],"name":"PairCreated","type":"event"},{"constant":true,"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"allPairs","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"allPairsLength","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"codehash","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"tokenA","type":"address"},{"internalType":"address","name":"tokenB","type":"address"}],"name":"createPair","outputs":[{"internalType":"address","name":"pair","type":"address"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"feeTo","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"feeToSetter","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"address","name":"","type":"address"}],"name":"getPair","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"_feeTo","type":"address"}],"name":"setFeeTo","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"_feeToSetter","type":"address"}],"name":"setFeeToSetter","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"}]

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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)

0000000000000000000000006940eba67a88906d56314f0ee609a50a66dcb2be

-----Decoded View---------------
Arg [0] : _feeToSetter (address): 0x6940eba67a88906d56314f0ee609a50a66dcb2be

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 0000000000000000000000006940eba67a88906d56314f0ee609a50a66dcb2be


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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