Contract Address Details

0x98fB5C40B24C1759469DFE0c5436888422Ac3c8c

Contract Name: HopiumRewardFeeRouter

Creator: 0x4afd6d–e2c840 at 0x55878b–eb295a

Balance: 0.000000000000000031 GDCC ( )

Tokens: Fetching tokens... Error trying to fetch balances.

Transactions: 292 Transactions

Transfers: 294 Transfers

Gas Used: 59,990,726

Last Balance Update: 6455931

Transactions Token Transfers Internal Transactions Coin Balance History Code Read Contract Write Contract

Contract name:: HopiumRewardFeeRouter
Optimization enabled: true

Compiler version: v0.6.6+commit.6c089d02
Optimization runs: 200

EVM Version: default
Verified at: 2022-06-13T08:19:26.297159Z

Constructor Arguments

00000000000000000000000095ef9160eaf07b5f47e758b6dc79cc3076d8272b0000000000000000000000000e7fcfb465677c82c872271ff752547be8e8a1d80000000000000000000000004afd6dbf10007049981fa6dd656959560be2c840

Arg [0] (address) : 0x95ef9160eaf07b5f47e758b6dc79cc3076d8272b
Arg [1] (address) : 0x0e7fcfb465677c82c872271ff752547be8e8a1d8
Arg [2] (address) : 0x4afd6dbf10007049981fa6dd656959560be2c840

Contract source code

// File: IWGDCC.sol

pragma solidity >=0.5.0;

interface IWGDCC {
    function deposit() external payable;
    function transfer(address to, uint value) external returns (bool);
    function withdraw(uint) external;
}
// File: IGDCC20.sol

pragma solidity >=0.5.0;

interface IGDCC20 {
    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: 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: IHopiumPair.sol

pragma solidity >=0.5.0;

interface IHopiumPair {
    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 swapFee() external view returns (uint32);

    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;
    function setSwapFee(uint32) external;
}
// File: HopiumLibrary.sol

pragma solidity >=0.5.0;



library HopiumLibrary {
    using SafeMath for uint;

    // returns sorted token addresses, used to handle return values from pairs sorted in this order
    function sortTokens(address tokenA, address tokenB) internal pure returns (address token0, address token1) {
        require(tokenA != tokenB, 'HopiumLibrary: IDENTICAL_ADDRESSES');
        (token0, token1) = tokenA < tokenB ? (tokenA, tokenB) : (tokenB, tokenA);
        require(token0 != address(0), 'HopiumLibrary: ZERO_ADDRESS');
    }

    // calculates the CREATE2 address for a pair without making any external calls
    function pairFor(address factory, address tokenA, address tokenB) internal pure returns (address pair) {
        (address token0, address token1) = sortTokens(tokenA, tokenB);
        pair = address(uint(keccak256(abi.encodePacked(
                hex'ff',
                factory,
                keccak256(abi.encodePacked(token0, token1)),
                hex'7cff459fbfbe6c3ebbe00c1fa8673e03fc361a4161b7a3d21695ae68c292580f'   // INIT_CODE_PAIR_HASH of Hopium Factory
            ))));
    }

    function getSwapFee(address factory, address tokenA, address tokenB) internal view returns (uint swapFee) {
        swapFee = IHopiumPair(pairFor(factory, tokenA, tokenB)).swapFee();
    }

    // fetches and sorts the reserves for a pair
    function getReserves(address factory, address tokenA, address tokenB) internal view returns (uint reserveA, uint reserveB) {
        (address token0,) = sortTokens(tokenA, tokenB);
        pairFor(factory, tokenA, tokenB);
        (uint reserve0, uint reserve1,) = IHopiumPair(pairFor(factory, tokenA, tokenB)).getReserves();
        (reserveA, reserveB) = tokenA == token0 ? (reserve0, reserve1) : (reserve1, reserve0);
    }

    // given some amount of an asset and pair reserves, returns an equivalent amount of the other asset
    function quote(uint amountA, uint reserveA, uint reserveB) internal pure returns (uint amountB) {
        require(amountA > 0, 'HopiumLibrary: INSUFFICIENT_AMOUNT');
        require(reserveA > 0 && reserveB > 0, 'HopiumLibrary: INSUFFICIENT_LIQUIDITY');
        amountB = amountA.mul(reserveB) / reserveA;
    }

    // given an input amount of an asset and pair reserves, returns the maximum output amount of the other asset
    function getAmountOut(uint amountIn, uint reserveIn, uint reserveOut, uint swapFee) internal pure returns (uint amountOut) {
        require(amountIn > 0, 'HopiumLibrary: INSUFFICIENT_INPUT_AMOUNT');
        require(reserveIn > 0 && reserveOut > 0, 'HopiumLibrary: INSUFFICIENT_LIQUIDITY');
        uint amountInWithFee = amountIn.mul(uint(1000).sub(swapFee));
        uint numerator = amountInWithFee.mul(reserveOut);
        uint denominator = reserveIn.mul(1000).add(amountInWithFee);
        amountOut = numerator / denominator;
    }

    // given an output amount of an asset and pair reserves, returns a required input amount of the other asset
    function getAmountIn(uint amountOut, uint reserveIn, uint reserveOut, uint swapFee) internal pure returns (uint amountIn) {
        require(amountOut > 0, 'HopiumLibrary: INSUFFICIENT_OUTPUT_AMOUNT');
        require(reserveIn > 0 && reserveOut > 0, 'HopiumLibrary: INSUFFICIENT_LIQUIDITY');
        uint numerator = reserveIn.mul(amountOut).mul(1000);
        uint denominator = reserveOut.sub(amountOut).mul(uint(1000).sub(swapFee));
        amountIn = (numerator / denominator).add(1);
    }

    // performs chained getAmountOut calculations on any number of pairs
    function getAmountsOut(address factory, uint amountIn, address[] memory path) internal view returns (uint[] memory amounts) {
        require(path.length >= 2, 'HopiumLibrary: INVALID_PATH');
        amounts = new uint[](path.length);
        amounts[0] = amountIn;
        for (uint i; i < path.length - 1; i++) {
            (uint reserveIn, uint reserveOut) = getReserves(factory, path[i], path[i + 1]);
            amounts[i + 1] = getAmountOut(amounts[i], reserveIn, reserveOut, getSwapFee(factory, path[i], path[i + 1]));
        }
    }

    // performs chained getAmountIn calculations on any number of pairs
    function getAmountsIn(address factory, uint amountOut, address[] memory path) internal view returns (uint[] memory amounts) {
        require(path.length >= 2, 'HopiumLibrary: INVALID_PATH');
        amounts = new uint[](path.length);
        amounts[amounts.length - 1] = amountOut;
        for (uint i = path.length - 1; i > 0; i--) {
            (uint reserveIn, uint reserveOut) = getReserves(factory, path[i - 1], path[i]);
            amounts[i - 1] = getAmountIn(amounts[i], reserveIn, reserveOut, getSwapFee(factory, path[i - 1], path[i]));
        }
    }
}
// File: IHopiumRouter01.sol

pragma solidity >=0.6.2;

interface IHopiumRouter01 {
    function factory() external pure returns (address);
    function WGDCC() external pure returns (address);

    function addLiquidity(
        address tokenA,
        address tokenB,
        uint amountADesired,
        uint amountBDesired,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB, uint liquidity);
    function addLiquidityGDCC(
        address token,
        uint amountTokenDesired,
        uint amountTokenMin,
        uint amountGDCCMin,
        address to,
        uint deadline
    ) external payable returns (uint amountToken, uint amountGDCC, uint liquidity);
    function removeLiquidity(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB);
    function removeLiquidityGDCC(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountGDCCMin,
        address to,
        uint deadline
    ) external returns (uint amountToken, uint amountGDCC);
    function removeLiquidityWithPermit(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountA, uint amountB);
    function removeLiquidityGDCCWithPermit(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountGDCCMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountToken, uint amountGDCC);
    function swapExactTokensForTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
    function swapTokensForExactTokens(
        uint amountOut,
        uint amountInMax,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
    function swapExactGDCCForTokens(uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        payable
        returns (uint[] memory amounts);
    function swapTokensForExactGDCC(uint amountOut, uint amountInMax, address[] calldata path, address to, uint deadline)
        external
        returns (uint[] memory amounts);
    function swapExactTokensForGDCC(uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        returns (uint[] memory amounts);
    function swapGDCCForExactTokens(uint amountOut, address[] calldata path, address to, uint deadline)
        external
        payable
        returns (uint[] memory amounts);

    function quote(uint amountA, uint reserveA, uint reserveB) external pure returns (uint amountB);
    function getAmountOut(uint amountIn, uint reserveIn, uint reserveOut, uint swapFee) external pure returns (uint amountOut);
    function getAmountIn(uint amountOut, uint reserveIn, uint reserveOut, uint swapFee) external pure returns (uint amountIn);
    function getAmountsOut(uint amountIn, address[] calldata path) external view returns (uint[] memory amounts);
    function getAmountsIn(uint amountOut, address[] calldata path) external view returns (uint[] memory amounts);
}
// File: IHopiumRouter.sol

pragma solidity >=0.6.2;


interface IHopiumRouter is IHopiumRouter01 {
    function removeLiquidityGDCCSupportingFeeOnTransferTokens(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountGDCCMin,
        address to,
        uint deadline
    ) external returns (uint amountGDCC);
    function removeLiquidityGDCCWithPermitSupportingFeeOnTransferTokens(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountGDCCMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountGDCC);

    function swapExactTokensForTokensSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
    function swapExactGDCCForTokensSupportingFeeOnTransferTokens(
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external payable;
    function swapExactTokensForGDCCSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
}
// File: /TransferHelper.sol



pragma solidity >=0.6.0;

// helper methods for interacting with GDCC20 tokens and sending GDCC that do not consistently return true/false
library TransferHelper {
    function safeApprove(
        address token,
        address to,
        uint256 value
    ) internal {
        // bytes4(keccak256(bytes('approve(address,uint256)')));
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x095ea7b3, to, value));
        require(
            success && (data.length == 0 || abi.decode(data, (bool))),
            'TransferHelper::safeApprove: approve failed'
        );
    }

    function safeTransfer(
        address token,
        address to,
        uint256 value
    ) internal {
        // bytes4(keccak256(bytes('transfer(address,uint256)')));
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0xa9059cbb, to, value));
        require(
            success && (data.length == 0 || abi.decode(data, (bool))),
            'TransferHelper::safeTransfer: transfer failed'
        );
    }

    function safeTransferFrom(
        address token,
        address from,
        address to,
        uint256 value
    ) internal {
        // bytes4(keccak256(bytes('transferFrom(address,address,uint256)')));
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x23b872dd, from, to, value));
        require(
            success && (data.length == 0 || abi.decode(data, (bool))),
            'TransferHelper::transferFrom: transferFrom failed'
        );
    }

    function safeTransferGDCC(address to, uint256 value) internal {
        (bool success, ) = to.call{value: value}(new bytes(0));
        require(success, 'TransferHelper::safeTransferGDCC: GDCC transfer failed');
    }
}

// File: IHopiumFactory.sol

pragma solidity >=0.5.0;

interface IHopiumFactory {
    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;
    function setSwapFee(address _pair, uint32 _swapFee) external;
}
// File: HopiumRouter.sol

pragma solidity =0.6.6;








contract HopiumRewardFeeRouter is IHopiumRouter {
    using SafeMath for uint;

    address public immutable override factory;
    address public immutable override WGDCC;
    address public swapfeeSetter;
    uint256 swapFee = 15; // 0.15% swap fee default

    modifier ensure(uint deadline) {
        require(deadline >= block.timestamp, 'HopiumRouter: EXPIRED');
        _;
    }

    constructor(address _factory, address _WGDCC, address _feeSetter) public {
        factory = _factory;
        WGDCC = _WGDCC;
        swapfeeSetter = _feeSetter;
    }

    function updateSwapFee(uint256 _swapFee) external {
        require(msg.sender == swapfeeSetter, "HopiumRouter: UNABLE To SET FEE");
        swapFee = _swapFee;
    }

    function updateSwapFeeSettor(address _swapFeeSetter) external {
        require(msg.sender == swapfeeSetter, "HopiumRouter: Not Fee Setter");
        swapfeeSetter = _swapFeeSetter;
    }

    receive() external payable {
        assert(msg.sender == WGDCC); // only accept GDCC via fallback from the WGDCC contract
    }

    // **** ADD LIQUIDITY ****
    function _addLiquidity(
        address tokenA,
        address tokenB,
        uint amountADesired,
        uint amountBDesired,
        uint amountAMin,
        uint amountBMin
    ) internal virtual returns (uint amountA, uint amountB) {
        // create the pair if it doesn't exist yet
        if (IHopiumFactory(factory).getPair(tokenA, tokenB) == address(0)) {
            IHopiumFactory(factory).createPair(tokenA, tokenB);
        }
        (uint reserveA, uint reserveB) = HopiumLibrary.getReserves(factory, tokenA, tokenB);
        if (reserveA == 0 && reserveB == 0) {
            (amountA, amountB) = (amountADesired, amountBDesired);
        } else {
            uint amountBOptimal = HopiumLibrary.quote(amountADesired, reserveA, reserveB);
            if (amountBOptimal <= amountBDesired) {
                require(amountBOptimal >= amountBMin, 'HopiumRouter: INSUFFICIENT_B_AMOUNT');
                (amountA, amountB) = (amountADesired, amountBOptimal);
            } else {
                uint amountAOptimal = HopiumLibrary.quote(amountBDesired, reserveB, reserveA);
                assert(amountAOptimal <= amountADesired);
                require(amountAOptimal >= amountAMin, 'HopiumRouter: INSUFFICIENT_A_AMOUNT');
                (amountA, amountB) = (amountAOptimal, amountBDesired);
            }
        }
    }
    function addLiquidity(
        address tokenA,
        address tokenB,
        uint amountADesired,
        uint amountBDesired,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external virtual override ensure(deadline) returns (uint amountA, uint amountB, uint liquidity) {
        (amountA, amountB) = _addLiquidity(tokenA, tokenB, amountADesired, amountBDesired, amountAMin, amountBMin);
        address pair = HopiumLibrary.pairFor(factory, tokenA, tokenB);
        TransferHelper.safeTransferFrom(tokenA, msg.sender, pair, amountA);
        TransferHelper.safeTransferFrom(tokenB, msg.sender, pair, amountB);
        liquidity = IHopiumPair(pair).mint(to);
    }
    function addLiquidityGDCC(
        address token,
        uint amountTokenDesired,
        uint amountTokenMin,
        uint amountGDCCMin,
        address to,
        uint deadline
    ) external virtual override payable ensure(deadline) returns (uint amountToken, uint amountGDCC, uint liquidity) {
        (amountToken, amountGDCC) = _addLiquidity(
            token,
            WGDCC,
            amountTokenDesired,
            msg.value,
            amountTokenMin,
            amountGDCCMin
        );
        address pair = HopiumLibrary.pairFor(factory, token, WGDCC);
        TransferHelper.safeTransferFrom(token, msg.sender, pair, amountToken);
        IWGDCC(WGDCC).deposit{value: amountGDCC}();
        assert(IWGDCC(WGDCC).transfer(pair, amountGDCC));
        liquidity = IHopiumPair(pair).mint(to);
        // refund dust eth, if any
        if (msg.value > amountGDCC) TransferHelper.safeTransferGDCC(msg.sender, msg.value - amountGDCC);
    }

    // **** REMOVE LIQUIDITY ****
    function removeLiquidity(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) public virtual override ensure(deadline) returns (uint amountA, uint amountB) {
        address pair = HopiumLibrary.pairFor(factory, tokenA, tokenB);
        IHopiumPair(pair).transferFrom(msg.sender, pair, liquidity); // send liquidity to pair
        (uint amount0, uint amount1) = IHopiumPair(pair).burn(to);
        (address token0,) = HopiumLibrary.sortTokens(tokenA, tokenB);
        (amountA, amountB) = tokenA == token0 ? (amount0, amount1) : (amount1, amount0);
        require(amountA >= amountAMin, 'HopiumRouter: INSUFFICIENT_A_AMOUNT');
        require(amountB >= amountBMin, 'HopiumRouter: INSUFFICIENT_B_AMOUNT');
    }
    function removeLiquidityGDCC(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountGDCCMin,
        address to,
        uint deadline
    ) public virtual override ensure(deadline) returns (uint amountToken, uint amountGDCC) {
        (amountToken, amountGDCC) = removeLiquidity(
            token,
            WGDCC,
            liquidity,
            amountTokenMin,
            amountGDCCMin,
            address(this),
            deadline
        );
        TransferHelper.safeTransfer(token, to, amountToken);
        IWGDCC(WGDCC).withdraw(amountGDCC);
        TransferHelper.safeTransferGDCC(to, amountGDCC);
    }
    function removeLiquidityWithPermit(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external virtual override returns (uint amountA, uint amountB) {
        address pair = HopiumLibrary.pairFor(factory, tokenA, tokenB);
        uint value = approveMax ? uint(-1) : liquidity;
        IHopiumPair(pair).permit(msg.sender, address(this), value, deadline, v, r, s);
        (amountA, amountB) = removeLiquidity(tokenA, tokenB, liquidity, amountAMin, amountBMin, to, deadline);
    }
    function removeLiquidityGDCCWithPermit(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountGDCCMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external virtual override returns (uint amountToken, uint amountGDCC) {
        address pair = HopiumLibrary.pairFor(factory, token, WGDCC);
        uint value = approveMax ? uint(-1) : liquidity;
        IHopiumPair(pair).permit(msg.sender, address(this), value, deadline, v, r, s);
        (amountToken, amountGDCC) = removeLiquidityGDCC(token, liquidity, amountTokenMin, amountGDCCMin, to, deadline);
    }

    // **** REMOVE LIQUIDITY (supporting fee-on-transfer tokens) ****
    function removeLiquidityGDCCSupportingFeeOnTransferTokens(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountGDCCMin,
        address to,
        uint deadline
    ) public virtual override ensure(deadline) returns (uint amountGDCC) {
        (, amountGDCC) = removeLiquidity(
            token,
            WGDCC,
            liquidity,
            amountTokenMin,
            amountGDCCMin,
            address(this),
            deadline
        );
        TransferHelper.safeTransfer(token, to, IGDCC20(token).balanceOf(address(this)));
        IWGDCC(WGDCC).withdraw(amountGDCC);
        TransferHelper.safeTransferGDCC(to, amountGDCC);
    }
    function removeLiquidityGDCCWithPermitSupportingFeeOnTransferTokens(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountGDCCMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external virtual override returns (uint amountGDCC) {
        address pair = HopiumLibrary.pairFor(factory, token, WGDCC);
        uint value = approveMax ? uint(-1) : liquidity;
        IHopiumPair(pair).permit(msg.sender, address(this), value, deadline, v, r, s);
        amountGDCC = removeLiquidityGDCCSupportingFeeOnTransferTokens(
            token, liquidity, amountTokenMin, amountGDCCMin, to, deadline
        );
    }

    // **** SWAP ****
    // requires the initial amount to have already been sent to the first pair
    function _swap(uint[] memory amounts, address[] memory path, address _to) internal virtual {
        for (uint i; i < path.length - 1; i++) {
            (address input, address output) = (path[i], path[i + 1]);
            (address token0,) = HopiumLibrary.sortTokens(input, output);
            uint amountOut = amounts[i + 1];
            (uint amount0Out, uint amount1Out) = input == token0 ? (uint(0), amountOut) : (amountOut, uint(0));
            address to = i < path.length - 2 ? HopiumLibrary.pairFor(factory, output, path[i + 2]) : _to;
            IHopiumPair(HopiumLibrary.pairFor(factory, input, output)).swap(
                amount0Out, amount1Out, to, new bytes(0)
            );
        }
    }
    function swapExactTokensForTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external virtual override ensure(deadline) returns (uint[] memory amounts) {
        amounts = HopiumLibrary.getAmountsOut(factory, amountIn * (10000 - swapFee) / 10000, path); // 0.15% swap fee
        require(amounts[amounts.length - 1] >= amountOutMin, 'HopiumRouter: INSUFFICIENT_OUTPUT_AMOUNT');
        TransferHelper.safeTransferFrom(
            path[0], msg.sender, HopiumLibrary.pairFor(factory, path[0], path[1]), amounts[0]
        );
        TransferHelper.safeTransferFrom(path[0], msg.sender, IHopiumFactory(factory).feeTo(), amounts[0] * swapFee / 10000); // 0.15% default swap fee(withdraw at once)
        _swap(amounts, path, to);
    }
    function swapTokensForExactTokens(
        uint amountOut,
        uint amountInMax,
        address[] calldata path,
        address to,
        uint deadline
    ) external virtual override ensure(deadline) returns (uint[] memory amounts) {
        amounts = HopiumLibrary.getAmountsIn(factory, amountOut, path);
        require(amounts[0] * (10000 + swapFee) / 10000 <= amountInMax, 'HopiumRouter: EXCESSIVE_INPUT_AMOUNT'); // 0.15% default swap fee check
        TransferHelper.safeTransferFrom(
            path[0], msg.sender, HopiumLibrary.pairFor(factory, path[0], path[1]), amounts[0]
        );
        TransferHelper.safeTransferFrom(path[0], msg.sender, IHopiumFactory(factory).feeTo(), amounts[0] * swapFee / 10000); // 0.15% default swap fee
        _swap(amounts, path, to);
    }
    function swapExactGDCCForTokens(uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        virtual
        override
        payable
        ensure(deadline)
        returns (uint[] memory amounts)
    {
        require(path[0] == WGDCC, 'HopiumRouter: INVALID_PATH');
        amounts = HopiumLibrary.getAmountsOut(factory, msg.value * (10000 - swapFee) / 10000, path); // 0.15% swap fee default
        require(amounts[amounts.length - 1] >= amountOutMin, 'HopiumRouter: INSUFFICIENT_OUTPUT_AMOUNT');
        IWGDCC(WGDCC).deposit{value: amounts[0]}();
        assert(IWGDCC(WGDCC).transfer(HopiumLibrary.pairFor(factory, path[0], path[1]), amounts[0]));
        _swap(amounts, path, to);
        TransferHelper.safeTransferGDCC(IHopiumFactory(factory).feeTo(), msg.value * swapFee / 10000); // 0.15% swap fee default(withdraw at once)
    }
    function swapTokensForExactGDCC(uint amountOut, uint amountInMax, address[] calldata path, address to, uint deadline)
        external
        virtual
        override
        ensure(deadline)
        returns (uint[] memory amounts)
    {
        require(path[path.length - 1] == WGDCC, 'HopiumRouter: INVALID_PATH');
        amounts = HopiumLibrary.getAmountsIn(factory, amountOut, path);
        require(amounts[0] <= amountInMax, 'HopiumRouter: EXCESSIVE_INPUT_AMOUNT');
        TransferHelper.safeTransferFrom(
            path[0], msg.sender, HopiumLibrary.pairFor(factory, path[0], path[1]), amounts[0]
        );
        _swap(amounts, path, address(this));
        IWGDCC(WGDCC).withdraw(amounts[amounts.length - 1]);
        TransferHelper.safeTransferGDCC(to, amounts[amounts.length - 1] * (10000 - swapFee) / 10000); // 0.15% swap fee default
        TransferHelper.safeTransferGDCC(IHopiumFactory(factory).feeTo(), amounts[amounts.length - 1] * swapFee / 10000); // 0.15% swap fee default(withdraw at once)
    }
    function swapExactTokensForGDCC(uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        virtual
        override
        ensure(deadline)
        returns (uint[] memory amounts)
    {
        require(path[path.length - 1] == WGDCC, 'HopiumRouter: INVALID_PATH');
        amounts = HopiumLibrary.getAmountsOut(factory, amountIn, path);
        require(amounts[amounts.length - 1] >= amountOutMin, 'HopiumRouter: INSUFFICIENT_OUTPUT_AMOUNT');
        TransferHelper.safeTransferFrom(
            path[0], msg.sender, HopiumLibrary.pairFor(factory, path[0], path[1]), amounts[0]
        );
        _swap(amounts, path, address(this));
        IWGDCC(WGDCC).withdraw(amounts[amounts.length - 1]);
        TransferHelper.safeTransferGDCC(to, amounts[amounts.length - 1] * (10000 - swapFee) / 10000); // 0.15% swap fee default
        TransferHelper.safeTransferGDCC(IHopiumFactory(factory).feeTo(), amounts[amounts.length - 1] * swapFee / 10000); // 0.15% swap fee default(withdraw at once)
    }
    function swapGDCCForExactTokens(uint amountOut, address[] calldata path, address to, uint deadline)
        external
        virtual
        override
        payable
        ensure(deadline)
        returns (uint[] memory amounts)
    {
        require(path[0] == WGDCC, 'HopiumRouter: INVALID_PATH');
        amounts = HopiumLibrary.getAmountsIn(factory, amountOut, path);
        require(amounts[0] * (10000 + swapFee) / 10000 <= msg.value, 'HopiumRouter: EXCESSIVE_INPUT_AMOUNT'); // swap fee check
        IWGDCC(WGDCC).deposit{value: amounts[0]}();
        assert(IWGDCC(WGDCC).transfer(HopiumLibrary.pairFor(factory, path[0], path[1]), amounts[0]));
        _swap(amounts, path, to);
        TransferHelper.safeTransferGDCC(IHopiumFactory(factory).feeTo(), amounts[0] * swapFee / 10000); // 0.15% swap fee(withdraw at once)
        // refund dust eth, if any
        if (msg.value > amounts[0] * (10000 + swapFee) / 10000) TransferHelper.safeTransferGDCC(msg.sender, msg.value - amounts[0] * (10000 + swapFee) / 10000); // 0.15% swap fee
    }

    // **** SWAP (supporting fee-on-transfer tokens) ****
    // requires the initial amount to have already been sent to the first pair
    function _swapSupportingFeeOnTransferTokens(address[] memory path, address _to) internal virtual {
        for (uint i; i < path.length - 1; i++) {
            (address input, address output) = (path[i], path[i + 1]);
            (address token0,) = HopiumLibrary.sortTokens(input, output);
            IHopiumPair pair = IHopiumPair(HopiumLibrary.pairFor(factory, input, output));
            uint amountInput;
            uint amountOutput;
            { // scope to avoid stack too deep errors
            (uint reserve0, uint reserve1,) = pair.getReserves();
            (uint reserveInput, uint reserveOutput) = input == token0 ? (reserve0, reserve1) : (reserve1, reserve0);
            amountInput = IGDCC20(input).balanceOf(address(pair)).sub(reserveInput);
            amountOutput = HopiumLibrary.getAmountOut(amountInput, reserveInput, reserveOutput, pair.swapFee());
            }
            (uint amount0Out, uint amount1Out) = input == token0 ? (uint(0), amountOutput) : (amountOutput, uint(0));
            address to = i < path.length - 2 ? HopiumLibrary.pairFor(factory, output, path[i + 2]) : _to;
            pair.swap(amount0Out, amount1Out, to, new bytes(0));
        }
    }
    function swapExactTokensForTokensSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external virtual override ensure(deadline) {
        TransferHelper.safeTransferFrom(
            path[0], msg.sender, HopiumLibrary.pairFor(factory, path[0], path[1]), amountIn * (10000 - swapFee) / 10000
        );
        uint balanceBefore = IGDCC20(path[path.length - 1]).balanceOf(to);
        _swapSupportingFeeOnTransferTokens(path, to);
        require(
            IGDCC20(path[path.length - 1]).balanceOf(to).sub(balanceBefore) >= amountOutMin,
            'HopiumRouter: INSUFFICIENT_OUTPUT_AMOUNT'
        );
        TransferHelper.safeTransferFrom(
            path[0], msg.sender, IHopiumFactory(factory).feeTo(), amountIn * swapFee / 10000
        ); // 0.15% default swap fee(withdraw at once)
    }
    function swapExactGDCCForTokensSupportingFeeOnTransferTokens(
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    )
        external
        virtual
        override
        payable
        ensure(deadline)
    {
        require(path[0] == WGDCC, 'HopiumRouter: INVALID_PATH');
        uint amountIn = msg.value * (10000 - swapFee) / 10000; //0.15% swap fee default
        IWGDCC(WGDCC).deposit{value: amountIn}();
        assert(IWGDCC(WGDCC).transfer(HopiumLibrary.pairFor(factory, path[0], path[1]), amountIn));
        uint balanceBefore = IGDCC20(path[path.length - 1]).balanceOf(to);
        _swapSupportingFeeOnTransferTokens(path, to);
        require(
            IGDCC20(path[path.length - 1]).balanceOf(to).sub(balanceBefore) >= amountOutMin,
            'HopiumRouter: INSUFFICIENT_OUTPUT_AMOUNT'
        );
        TransferHelper.safeTransferGDCC(IHopiumFactory(factory).feeTo(), msg.value * swapFee / 10000); // 0.15% swap fee default(withdraw at once)
    }
    function swapExactTokensForGDCCSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    )
        external
        virtual
        override
        ensure(deadline)
    {
        require(path[path.length - 1] == WGDCC, 'HopiumRouter: INVALID_PATH');
        TransferHelper.safeTransferFrom(
            path[0], msg.sender, HopiumLibrary.pairFor(factory, path[0], path[1]), amountIn
        );
        _swapSupportingFeeOnTransferTokens(path, address(this));
        uint amountOut = IGDCC20(WGDCC).balanceOf(address(this));
        require(amountOut >= amountOutMin, 'HopiumRouter: INSUFFICIENT_OUTPUT_AMOUNT');
        IWGDCC(WGDCC).withdraw(amountOut);
        TransferHelper.safeTransferGDCC(to, amountOut * (10000 - swapFee) / 10000); //0.15% swap fee default
        TransferHelper.safeTransferGDCC(IHopiumFactory(factory).feeTo(), amountOut * swapFee / 10000); // 0.15% swap fee default(withdraw at once)
    }

    // **** LIBRARY FUNCTIONS ****
    function quote(uint amountA, uint reserveA, uint reserveB) public pure virtual override returns (uint amountB) {
        return HopiumLibrary.quote(amountA, reserveA, reserveB);
    }

    function getAmountOut(uint amountIn, uint reserveIn, uint reserveOut, uint _swapFee)
        public
        pure
        virtual
        override
        returns (uint amountOut)
    {
        return HopiumLibrary.getAmountOut(amountIn, reserveIn, reserveOut, _swapFee);
    }

    function getAmountIn(uint amountOut, uint reserveIn, uint reserveOut, uint _swapFee)
        public
        pure
        virtual
        override
        returns (uint amountIn)
    {
        return HopiumLibrary.getAmountIn(amountOut, reserveIn, reserveOut, _swapFee);
    }

    function getAmountsOut(uint amountIn, address[] memory path)
        public
        view
        virtual
        override
        returns (uint[] memory amounts)
    {
        return HopiumLibrary.getAmountsOut(factory, amountIn, path);
    }

    function getAmountsIn(uint amountOut, address[] memory path)
        public
        view
        virtual
        override
        returns (uint[] memory amounts)
    {
        return HopiumLibrary.getAmountsIn(factory, amountOut, path);
    }

    function withdrawToken(address _token) external {
        require(msg.sender == IHopiumFactory(factory).feeTo(), "permission-denied");
        IGDCC20 token = IGDCC20(_token);
        TransferHelper.safeTransfer(_token, msg.sender, token.balanceOf(address(this)));
    }

    function withdrawNativeCoin() external payable {
        require(msg.sender == IHopiumFactory(factory).feeTo(), "permission-denied");
        address payable msgSender = payable(msg.sender);
        msgSender.transfer(address(this).balance);
    }
}

Contract ABI

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{"type":"uint256","name":"amountGDCC","internalType":"uint256"}],"name":"removeLiquidityGDCCSupportingFeeOnTransferTokens","inputs":[{"type":"address","name":"token","internalType":"address"},{"type":"uint256","name":"liquidity","internalType":"uint256"},{"type":"uint256","name":"amountTokenMin","internalType":"uint256"},{"type":"uint256","name":"amountGDCCMin","internalType":"uint256"},{"type":"address","name":"to","internalType":"address"},{"type":"uint256","name":"deadline","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[{"type":"uint256","name":"amountToken","internalType":"uint256"},{"type":"uint256","name":"amountGDCC","internalType":"uint256"}],"name":"removeLiquidityGDCCWithPermit","inputs":[{"type":"address","name":"token","internalType":"address"},{"type":"uint256","name":"liquidity","internalType":"uint256"},{"type":"uint256","name":"amountTokenMin","internalType":"uint256"},{"type":"uint256","name":"amountGDCCMin","internalType":"uint256"},{"type":"address","name":"to","internalType":"address"},{"type":"uint256","name":"deadline","internalType":"uint256"},{"type":"bool","name":"approveMax","internalType":"bool"},{"type":"uint8","name":"v","internalType":"uint8"},{"type":"bytes32","name":"r","internalType":"bytes32"},{"type":"bytes32","name":"s","internalType":"bytes32"}]},{"type":"function","stateMutability":"nonpayable","outputs":[{"type":"uint256","name":"amountGDCC","internalType":"uint256"}],"name":"removeLiquidityGDCCWithPermitSupportingFeeOnTransferTokens","inputs":[{"type":"address","name":"token","internalType":"address"},{"type":"uint256","name":"liquidity","internalType":"uint256"},{"type":"uint256","name":"amountTokenMin","internalType":"uint256"},{"type":"uint256","name":"amountGDCCMin","internalType":"uint256"},{"type":"address","name":"to","internalType":"address"},{"type":"uint256","name":"deadline","internalType":"uint256"},{"type":"bool","name":"approveMax","internalType":"bool"},{"type":"uint8","name":"v","internalType":"uint8"},{"type":"bytes32","name":"r","internalType":"bytes32"},{"type":"bytes32","name":"s","internalType":"bytes32"}]},{"type":"function","stateMutability":"nonpayable","outputs":[{"type":"uint256","name":"amountA","internalType":"uint256"},{"type":"uint256","name":"amountB","internalType":"uint256"}],"name":"removeLiquidityWithPermit","inputs":[{"type":"address","name":"tokenA","internalType":"address"},{"type":"address","name":"tokenB","internalType":"address"},{"type":"uint256","name":"liquidity","internalType":"uint256"},{"type":"uint256","name":"amountAMin","internalType":"uint256"},{"type":"uint256","name":"amountBMin","internalType":"uint256"},{"type":"address","name":"to","internalType":"address"},{"type":"uint256","name":"deadline","internalType":"uint256"},{"type":"bool","name":"approveMax","internalType":"bool"},{"type":"uint8","name":"v","internalType":"uint8"},{"type":"bytes32","name":"r","internalType":"bytes32"},{"type":"bytes32","name":"s","internalType":"bytes32"}]},{"type":"function","stateMutability":"payable","outputs":[{"type":"uint256[]","name":"amounts","internalType":"uint256[]"}],"name":"swapExactGDCCForTokens","inputs":[{"type":"uint256","name":"amountOutMin","internalType":"uint256"},{"type":"address[]","name":"path","internalType":"address[]"},{"type":"address","name":"to","internalType":"address"},{"type":"uint256","name":"deadline","internalType":"uint256"}]},{"type":"function","stateMutability":"payable","outputs":[],"name":"swapExactGDCCForTokensSupportingFeeOnTransferTokens","inputs":[{"type":"uint256","name":"amountOutMin","internalType":"uint256"},{"type":"address[]","name":"path","internalType":"address[]"},{"type":"address","name":"to","internalType":"address"},{"type":"uint256","name":"deadline","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[{"type":"uint256[]","name":"amounts","internalType":"uint256[]"}],"name":"swapExactTokensForGDCC","inputs":[{"type":"uint256","name":"amountIn","internalType":"uint256"},{"type":"uint256","name":"amountOutMin","internalType":"uint256"},{"type":"address[]","name":"path","internalType":"address[]"},{"type":"address","name":"to","internalType":"address"},{"type":"uint256","name":"deadline","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"swapExactTokensForGDCCSupportingFeeOnTransferTokens","inputs":[{"type":"uint256","name":"amountIn","internalType":"uint256"},{"type":"uint256","name":"amountOutMin","internalType":"uint256"},{"type":"address[]","name":"path","internalType":"address[]"},{"type":"address","name":"to","internalType":"address"},{"type":"uint256","name":"deadline","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[{"type":"uint256[]","name":"amounts","internalType":"uint256[]"}],"name":"swapExactTokensForTokens","inputs":[{"type":"uint256","name":"amountIn","internalType":"uint256"},{"type":"uint256","name":"amountOutMin","internalType":"uint256"},{"type":"address[]","name":"path","internalType":"address[]"},{"type":"address","name":"to","internalType":"address"},{"type":"uint256","name":"deadline","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"swapExactTokensForTokensSupportingFeeOnTransferTokens","inputs":[{"type":"uint256","name":"amountIn","internalType":"uint256"},{"type":"uint256","name":"amountOutMin","internalType":"uint256"},{"type":"address[]","name":"path","internalType":"address[]"},{"type":"address","name":"to","internalType":"address"},{"type":"uint256","name":"deadline","internalType":"uint256"}]},{"type":"function","stateMutability":"payable","outputs":[{"type":"uint256[]","name":"amounts","internalType":"uint256[]"}],"name":"swapGDCCForExactTokens","inputs":[{"type":"uint256","name":"amountOut","internalType":"uint256"},{"type":"address[]","name":"path","internalType":"address[]"},{"type":"address","name":"to","internalType":"address"},{"type":"uint256","name":"deadline","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[{"type":"uint256[]","name":"amounts","internalType":"uint256[]"}],"name":"swapTokensForExactGDCC","inputs":[{"type":"uint256","name":"amountOut","internalType":"uint256"},{"type":"uint256","name":"amountInMax","internalType":"uint256"},{"type":"address[]","name":"path","internalType":"address[]"},{"type":"address","name":"to","internalType":"address"},{"type":"uint256","name":"deadline","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[{"type":"uint256[]","name":"amounts","internalType":"uint256[]"}],"name":"swapTokensForExactTokens","inputs":[{"type":"uint256","name":"amountOut","internalType":"uint256"},{"type":"uint256","name":"amountInMax","internalType":"uint256"},{"type":"address[]","name":"path","internalType":"address[]"},{"type":"address","name":"to","internalType":"address"},{"type":"uint256","name":"deadline","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"address"}],"name":"swapfeeSetter","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"updateSwapFee","inputs":[{"type":"uint256","name":"_swapFee","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"updateSwapFeeSettor","inputs":[{"type":"address","name":"_swapFeeSetter","internalType":"address"}]},{"type":"function","stateMutability":"payable","outputs":[],"name":"withdrawNativeCoin","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"withdrawToken","inputs":[{"type":"address","name":"_token","internalType":"address"}]},{"type":"receive","stateMutability":"payable"}]

Deployed ByteCode

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