Contract 0x918d7e714243F7d9d463C37e106235dCde294ffC 1

 

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0xb6c46767137ec3c79503bea082ab4d67ae58e4e040424d477cfc7084f9333b8bSet Fee To26637212020-11-29 16:09:51328 days 2 hrs ago0xb7b78a4c03777e08dc144a0b7821282a3248294e IN  0x918d7e714243f7d9d463c37e106235dcde294ffc0 BNB0.00086818
0x431df271554302f79370a06fc3cd2fdf6ce60c0dce7c7b0329ecbcdff89606f90x6080604026632112020-11-29 15:44:21328 days 2 hrs ago0x80bb68f2664015b18c0c9fd9ed289a08334e4122 IN  Contract Creation0 BNB0.05086212
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0xfb6fadb1f223f32e517ab7e807e55070b79209fdc5258defc5e091eac92d06d2119715462021-10-21 18:19:312 days 18 mins ago 0x918d7e714243f7d9d463c37e106235dcde294ffc  Contract Creation0 BNB
0x5e5aaf927caf27c20dcb4851b31da71967f1e306f8dd199fcc82d69782f3bf12119596442021-10-21 8:05:022 days 10 hrs ago 0x918d7e714243f7d9d463c37e106235dcde294ffc  Contract Creation0 BNB
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0xd7cebea80a2153d8e782a414aaf0b795000202f67e44b71dbabe79dd85b8b42c117706912021-10-14 17:14:499 days 1 hr ago 0x918d7e714243f7d9d463c37e106235dcde294ffc  Contract Creation0 BNB
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0x7dc83f7f15b8cca13aef24e87f413949dc65dcc569d4bf66cb99f5f268401ae8113312332021-09-29 8:13:3824 days 10 hrs ago 0x918d7e714243f7d9d463c37e106235dcde294ffc  Contract Creation0 BNB
0x30ff52ba6a17356b153d1c5e6e7ccf249f2e1112eb60c46fc56dd8fc3b54c994110211312021-09-18 11:57:1935 days 6 hrs ago 0x918d7e714243f7d9d463c37e106235dcde294ffc  Contract Creation0 BNB
0x8416e3d47ba3dc3f00155dda0539955fc143b0ea31d3020a9c579e94b5a8dbef109194362021-09-14 22:59:3838 days 19 hrs ago 0x918d7e714243f7d9d463c37e106235dcde294ffc  Contract Creation0 BNB
0xd6b5882642c997f604074adcc9f3a4515f00a3db379f10e315a8b7162726ad36109191072021-09-14 22:43:1138 days 19 hrs ago 0x918d7e714243f7d9d463c37e106235dcde294ffc  Contract Creation0 BNB
0x4d2c07b5a3d3b727f8ba68203b7b671772b6b0ed58402f1d22f84dfc2eba157c109184902021-09-14 22:12:2038 days 20 hrs ago 0x918d7e714243f7d9d463c37e106235dcde294ffc  Contract Creation0 BNB
0x757d7835a5ddab79929b1562d5d1217aa0f2b39d0e0243fdd6e2f35543b677b6107475842021-09-08 22:51:4044 days 19 hrs ago 0x918d7e714243f7d9d463c37e106235dcde294ffc  Contract Creation0 BNB
0x0914defd5eb326923fc42b38145e6581f7426827c48db8eb8d3ca5b32c76d4d1105094822021-08-31 14:19:3653 days 4 hrs ago 0x918d7e714243f7d9d463c37e106235dcde294ffc  Contract Creation0 BNB
0xd6d7b2bdb50e93790663da1efd8ecacc49459397b6d1af751bf3a6493346b350105094182021-08-31 14:16:1653 days 4 hrs ago 0x918d7e714243f7d9d463c37e106235dcde294ffc  Contract Creation0 BNB
0xd692b43dbbed4e3931d58e75547e2d3f872753c4004eaaf1b13bf8368e8ebacc105091722021-08-31 14:03:2453 days 4 hrs ago 0x918d7e714243f7d9d463c37e106235dcde294ffc  Contract Creation0 BNB
0x25b005ae1bee000718231239703db223e150bbd3575a46943280b0caa6b7a785101373272021-08-18 13:05:0666 days 5 hrs ago 0x918d7e714243f7d9d463c37e106235dcde294ffc  Contract Creation0 BNB
0x9a75d558928730a7a21d94b9e8739cd98f29000a274190a896792be0ccb64568101364052021-08-18 12:19:0066 days 6 hrs ago 0x918d7e714243f7d9d463c37e106235dcde294ffc  Contract Creation0 BNB
0xe7ff1ad8d970b3bace91d3f48f793cb145a61f8fc2817c65dff066e45b74e60c101362372021-08-18 12:10:3666 days 6 hrs ago 0x918d7e714243f7d9d463c37e106235dcde294ffc  Contract Creation0 BNB
0xa2cc18076a334b07e07bed7630247ffc33f9c063043e923176660e6e4f2613b1100731942021-08-16 7:30:0468 days 11 hrs ago 0x918d7e714243f7d9d463c37e106235dcde294ffc  Contract Creation0 BNB
0x9809d0e7f5b0edfaf6e46af9f33f4c8ebc1279ddcd877024417c59d250e98c2498852412021-08-09 16:12:0575 days 2 hrs ago 0x918d7e714243f7d9d463c37e106235dcde294ffc  Contract Creation0 BNB
0x4ecafe3da3377bb3acd7289668a7f96db6c6c33fd1703458e89a8d78ec9049be86940142021-06-28 15:18:54117 days 3 hrs ago 0x918d7e714243f7d9d463c37e106235dcde294ffc  Contract Creation0 BNB
0xda8d4bd5a491898e4038a8a2b56288a32dfcfdf4ea36552bb1342e0f8169ee8a86940042021-06-28 15:18:24117 days 3 hrs ago 0x918d7e714243f7d9d463c37e106235dcde294ffc  Contract Creation0 BNB
0x44e5279a7f1a8dc2e3a214280969a85c57f059011a7b4a03d68efe494b1936e286939622021-06-28 15:16:18117 days 3 hrs ago 0x918d7e714243f7d9d463c37e106235dcde294ffc  Contract Creation0 BNB
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Contract Source Code Verified (Exact Match)

Contract Name:
StableXFactory

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 2020-11-29
*/

// File: contracts/interfaces/IStableXFactory.sol

pragma solidity >=0.5.0;

interface IStableXFactory {
    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/interfaces/IStableXPair.sol

pragma solidity >=0.5.0;

interface IStableXPair {
    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/interfaces/IStableXERC20.sol

pragma solidity >=0.5.0;

interface IStableXERC20 {
    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/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');
    }
    
       /**
     * @dev Returns the integer division of two unsigned integers. Reverts on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

   
    
}

// File: contracts/StableXERC20.sol

pragma solidity =0.5.16;



contract StableXERC20 is IStableXERC20 {
    using SafeMath for uint;


    string public constant name = 'StableXSwap v1 LPs';
    string public constant symbol = 'STAX-LP';
    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, 'StableX: 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, 'StableX: INVALID_SIGNATURE');
        _approve(owner, spender, value);
    }
}

// File: contracts/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/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/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/interfaces/IStableXCallee.sol

pragma solidity >=0.5.0;

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

// File: contracts/StableXPair.sol

pragma solidity =0.5.16;









contract StableXPair is IStableXPair, StableXERC20 {
    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, 'StableX: 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))), 'StableX: 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, 'StableX: 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), 'StableX: 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 4/5th of the growth in sqrt(k)
    function _mintFee(uint112 _reserve0, uint112 _reserve1) private returns (bool feeOn) {
        address feeTo = IStableXFactory(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)).mul(4);
                    uint denominator = rootK.add(rootKLast.mul(4));
                    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, 'StableX: 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
        bool feeOn = _mintFee(_reserve0, _reserve1);     
        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)];

      
    // Implement withdrawal fee, where a 0.4975% fee is levied on withdrawals if feeOn, to incentivize people to hold longer in the pools
    // This fee will be future split between STAX stakers and LP providers, to be governed by governance in the future
    // This fee can be mitigated by users by holding STAX to get a discount or get the fee fully waived, based on their average 30 day holdings.
    // If this fee is determined to be too punitive, this can be manually refunded to users on an ad-hoc basis from the STAX community Treasury
    
    // In this version, we use liquidity.div(201) instead of Fee variable to save on our stack variables.
    // In future, can make this fee editable by owner.
    // Getting IStableXFactory(factory)feeTo directly from the Factory, which is also only used in this scope
    // This makes the _safeTransfer of the fee a bit more messy but in attempts to make the scope work.
    // Also, it is pointless to obtain this feeTo unless feeOn is true
    // SCOPING TRICK: Because _totalSupply is only in this block, we can safely use the Uniswap-pioneered scoping method
    // to remove them from our stack after this block is executed
     
    {// Scope for _totalSupply is only within this block    
        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
        
        // Cannot burn 0 liquidity
        require(amount0 > 0 && amount1 > 0, 'StableX: INSUFFICIENT_LIQUIDITY_BURNED');
    
    
    // Fee calculation and _burn & _safeTransfer section
    // In the future, this can be done with an privileged withdrawal allowance imcremented by this fee to the community treasury
    // If true, Recalculates 99.5025% of the liquidity a user to be withdrawn in amount0 and amount1 for the tokens, 
    // otherwise no action needed on amount{0,1}
    // Subsequently burns corresponding LP tokens (with or without fee) provided    
    
       if (feeOn) {

            amount0 -= amount0.div(201);
            amount1 -= amount1.div(201);
            
    // Sends the 0.4975% Fee of LP tokens to the IStableXFactory feeTo Address        
            _safeTransfer(address(this), IStableXFactory(factory).feeTo(), liquidity.div(201));
            
    // Proceeds with the burn amount with the 0.4975% fee removed 
    // (which is not withdrawn from the pools and instead LP tokens are sent directly to the feeTo address above       
            _burn(address(this), liquidity.sub(liquidity.div(201)));
            
       } else {
    // Burns the full amount
            _burn(address(this), liquidity);
       }
     
    // Outside of this if feeOn statement, returns the appropriate funds to the user        
            _safeTransfer(_token0, to, amount0);
            _safeTransfer(_token1, to, amount1);
    }
    
        
    // Grabs the new balances of the tokens in the LP pool after the withdrawal takes place
        {
        balance0 = IERC20(_token0).balanceOf(address(this));
        balance1 = IERC20(_token1).balanceOf(address(this));
       
        _update(balance0, balance1, _reserve0, _reserve1);
        }
        { //Scoping trick to keep kLast separate from the rest
        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
    // This is where the trading fee logic is implemented for 6bps (0.06%) (see balance{0,1} adjusted)
    // Fixed decimal error from the original beta
    function swap(uint amount0Out, uint amount1Out, address to, bytes calldata data) external lock {
        require(amount0Out > 0 || amount1Out > 0, 'StableX: INSUFFICIENT_OUTPUT_AMOUNT');
        (uint112 _reserve0, uint112 _reserve1,) = getReserves(); // gas savings
        require(amount0Out < _reserve0 && amount1Out < _reserve1, 'StableX: 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, 'StableX: 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) IStableXCallee(to).stableXCall(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, 'StableX: INSUFFICIENT_INPUT_AMOUNT');
        { // scope for reserve{0,1}Adjusted, avoids stack too deep errors
        uint balance0Adjusted = balance0.mul(10000).sub(amount0In.mul(6));
        uint balance1Adjusted = balance1.mul(10000).sub(amount1In.mul(6));
        require(balance0Adjusted.mul(balance1Adjusted) >= uint(_reserve0).mul(_reserve1).mul(10000**2), 'StableX: 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/StableXFactory.sol

pragma solidity =0.5.16;



contract StableXFactory is IStableXFactory {
    bytes32 public constant INIT_CODE_PAIR_HASH = keccak256(abi.encodePacked(type(StableXPair).creationCode));

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

    function setFeeToSetter(address _feeToSetter) external {
        require(msg.sender == feeToSetter, 'StableX: 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":[],"name":"INIT_CODE_PAIR_HASH","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"payable":false,"stateMutability":"view","type":"function"},{"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":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)

000000000000000000000000b7b78a4c03777e08dc144a0b7821282a3248294e

-----Decoded View---------------
Arg [0] : _feeToSetter (address): 0xb7b78a4c03777e08dc144a0b7821282a3248294e

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 000000000000000000000000b7b78a4c03777e08dc144a0b7821282a3248294e


Deployed ByteCode Sourcemap

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Swarm Source

bzzr://7111a9897a9a84ac8a3d050e0d9185f00187eb430420af9fa9d0953a8e4ebc4f
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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