ETH Price: $3,339.80 (-1.04%)
Gas: 10 Gwei

Contract

0x086C40819110fc0B3953eaeC21577133bd0834Ba
 

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0 ETH

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$0.00

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Transfer Ownersh...147868802022-05-16 14:59:16805 days ago1652713156IN
0x086C4081...3bd0834Ba
0 ETH0.0017354760.49070074
Swap144914952022-03-31 3:14:11852 days ago1648696451IN
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0.00163916 ETH0.0017153737.05878717
Swap144914932022-03-31 3:14:05852 days ago1648696445IN
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0.00162389 ETH0.0013873236.71340981
Swap144863962022-03-30 8:05:00853 days ago1648627500IN
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3.40099594 ETH0.0013635536.51334263
Swap144861022022-03-30 7:01:23853 days ago1648623683IN
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0.00135442 ETH0.0011824428.85413825
Unoswap144834612022-03-29 21:10:50853 days ago1648588250IN
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0.0014442 ETH0.0094308347.07650863
Unoswap144783362022-03-29 2:10:26854 days ago1648519826IN
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0.00156369 ETH0.0087263850.54176101
Unoswap144776792022-03-28 23:39:50854 days ago1648510790IN
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0.00099759 ETH0.006856652.67543025
Unoswap144776452022-03-28 23:30:22854 days ago1648510222IN
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0.00189819 ETH0.0066805550.1144135
Unoswap144776422022-03-28 23:29:35854 days ago1648510175IN
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0.00094909 ETH0.0066805550.1144135
Unoswap144773142022-03-28 22:16:14854 days ago1648505774IN
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0.00120411 ETH0.0073949439.25027446
Unoswap144769722022-03-28 21:04:17854 days ago1648501457IN
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0.00134808 ETH0.0114547771.18170076
Unoswap144768402022-03-28 20:36:06854 days ago1648499766IN
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0.00103114 ETH0.01145154.44691326
Unoswap144768312022-03-28 20:34:44854 days ago1648499684IN
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1.00139466 ETH0.0084760373.64129609
Unoswap144767442022-03-28 20:14:48854 days ago1648498488IN
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0.25125502 ETH0.0128082259.09788587
Unoswap144767212022-03-28 20:10:50854 days ago1648498250IN
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0.31113861 ETH0.0119911989.11876363
Unoswap144766612022-03-28 19:57:58854 days ago1648497478IN
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0.00168241 ETH0.0118469488.83501332
Unoswap144766322022-03-28 19:51:11854 days ago1648497071IN
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2.00135649 ETH0.0096202471.6261022
Swap144763162022-03-28 18:37:16854 days ago1648492636IN
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3.00186906 ETH0.0027229967.3207802
Swap144762962022-03-28 18:34:49854 days ago1648492489IN
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3.00509451 ETH0.0034480792.56074817
Unoswap144762582022-03-28 18:28:27854 days ago1648492107IN
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0.00160683 ETH0.0113769784.84458162
Unoswap144759852022-03-28 17:29:09854 days ago1648488549IN
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0.00272394 ETH0.01605025115.25306628
Unoswap144755362022-03-28 15:45:26854 days ago1648482326IN
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0.92143956 ETH0.0104266576.01206381
Unoswap144753622022-03-28 15:04:36854 days ago1648479876IN
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1.50095554 ETH0.0060581450.45469062
Unoswap144753312022-03-28 14:59:27854 days ago1648479567IN
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0.00188514 ETH0.009805360.93168075
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144834612022-03-29 21:10:50853 days ago1648588250
0x086C4081...3bd0834Ba
0.0014442 ETH
144783362022-03-29 2:10:26854 days ago1648519826
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0.00156369 ETH
144776792022-03-28 23:39:50854 days ago1648510790
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0.00099759 ETH
144776792022-03-28 23:39:50854 days ago1648510790
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0.15226651 ETH
144776792022-03-28 23:39:50854 days ago1648510790
0x086C4081...3bd0834Ba
0.15226651 ETH
144776452022-03-28 23:30:22854 days ago1648510222
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0.15226651 ETH
144776452022-03-28 23:30:22854 days ago1648510222
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0.15226651 ETH
144776422022-03-28 23:29:35854 days ago1648510175
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0.15226651 ETH
144776422022-03-28 23:29:35854 days ago1648510175
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0.15226651 ETH
144773142022-03-28 22:16:14854 days ago1648505774
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0.00120411 ETH
144768402022-03-28 20:36:06854 days ago1648499766
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0.00103114 ETH
144768312022-03-28 20:34:44854 days ago1648499684
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0.00139466 ETH
144768312022-03-28 20:34:44854 days ago1648499684
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1 ETH
144767442022-03-28 20:14:48854 days ago1648498488
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0.00125502 ETH
144767442022-03-28 20:14:48854 days ago1648498488
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0.25 ETH
144767212022-03-28 20:10:50854 days ago1648498250
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0.00113861 ETH
144767212022-03-28 20:10:50854 days ago1648498250
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0.31 ETH
144766612022-03-28 19:57:58854 days ago1648497478
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0.00168241 ETH
144766612022-03-28 19:57:58854 days ago1648497478
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0.32491068 ETH
144766612022-03-28 19:57:58854 days ago1648497478
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0.32491068 ETH
144766322022-03-28 19:51:11854 days ago1648497071
0x086C4081...3bd0834Ba
0.00135649 ETH
144766322022-03-28 19:51:11854 days ago1648497071
0x086C4081...3bd0834Ba
2 ETH
144762582022-03-28 18:28:27854 days ago1648492107
0x086C4081...3bd0834Ba
0.00160683 ETH
144762582022-03-28 18:28:27854 days ago1648492107
0x086C4081...3bd0834Ba
0.22063983 ETH
144762582022-03-28 18:28:27854 days ago1648492107
0x086C4081...3bd0834Ba
0.22063983 ETH
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Contract Source Code Verified (Exact Match)

Contract Name:
DepoRouter

Compiler Version
v0.6.12+commit.27d51765

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion
File 1 of 8 : DepoRouter.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.6.12;

import "contracts/helpers/Permitable.sol";
import "contracts/libraries/SafeMath.sol";
import "contracts/Ownable.sol";

contract DepoRouter is Permitable, Ownable {
    using SafeMath for uint256;

    uint256 private constant _TRANSFER_FROM_CALL_SELECTOR_32 =
        0x23b872dd00000000000000000000000000000000000000000000000000000000;
    uint256 private constant _WETH_DEPOSIT_CALL_SELECTOR_32 =
        0xd0e30db000000000000000000000000000000000000000000000000000000000;
    uint256 private constant _WETH_WITHDRAW_CALL_SELECTOR_32 =
        0x2e1a7d4d00000000000000000000000000000000000000000000000000000000;
    uint256 private constant _ERC20_TRANSFER_CALL_SELECTOR_32 =
        0xa9059cbb00000000000000000000000000000000000000000000000000000000;
    uint256 private constant _ADDRESS_MASK =
        0x000000000000000000000000ffffffffffffffffffffffffffffffffffffffff;
    uint256 private constant _REVERSE_MASK =
        0x8000000000000000000000000000000000000000000000000000000000000000;
    uint256 private constant _WETH_MASK =
        0x4000000000000000000000000000000000000000000000000000000000000000;
    uint256 private constant _NUMERATOR_MASK =
        0x0000000000000000ffffffff0000000000000000000000000000000000000000;
    uint256 private constant _WETH =
        0x000000000000000000000000C02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2;
    uint256 private constant _UNISWAP_PAIR_RESERVES_CALL_SELECTOR_32 =
        0x0902f1ac00000000000000000000000000000000000000000000000000000000;
    uint256 private constant _UNISWAP_PAIR_SWAP_CALL_SELECTOR_32 =
        0x022c0d9f00000000000000000000000000000000000000000000000000000000;
    uint256 private constant _DENOMINATOR = 1000000000;
    uint256 private constant _NUMERATOR_OFFSET = 160;

    // treasury
    address public treasury;
    mapping(address => uint256) public userFeeCharged;

    event FeePayed(address user, uint256 amount);
    event TreasuryChanged(address oldTreasury, address newTreasury);

    receive() external payable {
        // solhint-disable-next-line avoid-tx-origin
        require(msg.sender != tx.origin, "ETH deposit rejected");
    }

    function setTreasury(address _treasury) external onlyOwner {
        require(_treasury != address(0), "Treasury address missing");

        address oldTreasury = treasury;
        treasury = _treasury;

        emit TreasuryChanged(oldTreasury, treasury);
    }

    function unoswapWithPermit(
        IERC20 srcToken,
        uint256 amount,
        uint256 minReturn,
        bytes32[] calldata pools,
        bytes calldata permit
    ) external payable returns (uint256 returnAmount) {
        _permit(srcToken, amount, permit);
        return unoswap(srcToken, amount, minReturn, pools);
    }

    function unoswap(
        IERC20 srcToken,
        uint256 amount,
        uint256 minReturn,
        bytes32[] calldata /* pools */
    ) public payable returns (uint256 returnAmount) {
        assembly {
            // solhint-disable-line no-inline-assembly
            function reRevert() {
                returndatacopy(0, 0, returndatasize())
                revert(0, returndatasize())
            }

            function revertWithReason(m, len) {
                mstore(
                    0,
                    0x08c379a000000000000000000000000000000000000000000000000000000000
                )
                mstore(
                    0x20,
                    0x0000002000000000000000000000000000000000000000000000000000000000
                )
                mstore(0x40, m)
                revert(0, len)
            }

            function swap(emptyPtr, swapAmount, pair, reversed, numerator, dst)
                -> ret
            {
                mstore(emptyPtr, _UNISWAP_PAIR_RESERVES_CALL_SELECTOR_32)
                if iszero(
                    staticcall(gas(), pair, emptyPtr, 0x4, emptyPtr, 0x40)
                ) {
                    reRevert()
                }

                let reserve0 := mload(emptyPtr)
                let reserve1 := mload(add(emptyPtr, 0x20))
                if reversed {
                    let tmp := reserve0
                    reserve0 := reserve1
                    reserve1 := tmp
                }
                ret := mul(swapAmount, numerator)
                ret := div(
                    mul(ret, reserve1),
                    add(ret, mul(reserve0, _DENOMINATOR))
                )

                mstore(emptyPtr, _UNISWAP_PAIR_SWAP_CALL_SELECTOR_32)
                switch reversed
                case 0 {
                    mstore(add(emptyPtr, 0x04), 0)
                    mstore(add(emptyPtr, 0x24), ret)
                }
                default {
                    mstore(add(emptyPtr, 0x04), ret)
                    mstore(add(emptyPtr, 0x24), 0)
                }
                mstore(add(emptyPtr, 0x44), dst)
                mstore(add(emptyPtr, 0x64), 0x80)
                mstore(add(emptyPtr, 0x84), 0)
                if iszero(call(gas(), pair, 0, emptyPtr, 0xa4, 0, 0)) {
                    reRevert()
                }
            }

            let emptyPtr := mload(0x40)
            mstore(0x40, add(emptyPtr, 0xc0))

            let poolsOffset := add(calldataload(0x64), 0x4)
            let poolsEndOffset := calldataload(poolsOffset)
            poolsOffset := add(poolsOffset, 0x20)
            poolsEndOffset := add(poolsOffset, mul(0x20, poolsEndOffset))
            let rawPair := calldataload(poolsOffset)
            switch srcToken
            case 0 {
                mstore(emptyPtr, _WETH_DEPOSIT_CALL_SELECTOR_32)
                if iszero(call(gas(), _WETH, amount, emptyPtr, 0x4, 0, 0)) {
                    reRevert()
                }

                mstore(emptyPtr, _ERC20_TRANSFER_CALL_SELECTOR_32)
                mstore(add(emptyPtr, 0x4), and(rawPair, _ADDRESS_MASK))
                mstore(add(emptyPtr, 0x24), amount)
                if iszero(call(gas(), _WETH, 0, emptyPtr, 0x44, 0, 0)) {
                    reRevert()
                }
            }
            default {
                mstore(emptyPtr, _TRANSFER_FROM_CALL_SELECTOR_32)
                mstore(add(emptyPtr, 0x4), caller())
                mstore(add(emptyPtr, 0x24), and(rawPair, _ADDRESS_MASK))
                mstore(add(emptyPtr, 0x44), amount)
                if iszero(call(gas(), srcToken, 0, emptyPtr, 0x64, 0, 0)) {
                    reRevert()
                }
            }

            returnAmount := amount

            for {
                let i := add(poolsOffset, 0x20)
            } lt(i, poolsEndOffset) {
                i := add(i, 0x20)
            } {
                let nextRawPair := calldataload(i)

                returnAmount := swap(
                    emptyPtr,
                    returnAmount,
                    and(rawPair, _ADDRESS_MASK),
                    and(rawPair, _REVERSE_MASK),
                    shr(_NUMERATOR_OFFSET, and(rawPair, _NUMERATOR_MASK)),
                    and(nextRawPair, _ADDRESS_MASK)
                )

                rawPair := nextRawPair
            }

            switch and(rawPair, _WETH_MASK)
            case 0 {
                returnAmount := swap(
                    emptyPtr,
                    returnAmount,
                    and(rawPair, _ADDRESS_MASK),
                    and(rawPair, _REVERSE_MASK),
                    shr(_NUMERATOR_OFFSET, and(rawPair, _NUMERATOR_MASK)),
                    caller()
                )
            }
            default {
                returnAmount := swap(
                    emptyPtr,
                    returnAmount,
                    and(rawPair, _ADDRESS_MASK),
                    and(rawPair, _REVERSE_MASK),
                    shr(_NUMERATOR_OFFSET, and(rawPair, _NUMERATOR_MASK)),
                    address()
                )

                mstore(emptyPtr, _WETH_WITHDRAW_CALL_SELECTOR_32)
                mstore(add(emptyPtr, 0x04), returnAmount)
                if iszero(call(gas(), _WETH, 0, emptyPtr, 0x24, 0, 0)) {
                    reRevert()
                }

                if iszero(call(gas(), caller(), returnAmount, 0, 0, 0, 0)) {
                    reRevert()
                }
            }

            if lt(returnAmount, minReturn) {
                revertWithReason(
                    0x000000164d696e2072657475726e206e6f742072656163686564000000000000,
                    0x5a
                ) // "Min return not reached"
            }
        }

        uint256 fee = srcToken != IERC20(0) ? msg.value : msg.value - amount;
        safeTransferETH(treasury, fee);

        emit FeePayed(msg.sender, fee);
    }

    /**
     * @dev Transfer eth
     * @param _to     receipnt address
     * @param _value  amount
     */
    function safeTransferETH(address _to, uint256 _value) internal {
        (bool success, ) = _to.call{value: _value}(new bytes(0));
        require(success, "SafeTransferETH: ETH transfer failed");
    }
}

File 2 of 8 : Permitable.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.6.12;

import "contracts/helpers/RevertReasonParser.sol";
import "contracts/interfaces/IERC20.sol";
import "contracts/interfaces/IERC20Permit.sol";

contract Permitable {
    event Error(string reason);

    function _permit(
        IERC20 token,
        uint256 amount,
        bytes calldata permit
    ) internal {
        if (permit.length == 32 * 7) {
            // solhint-disable-next-line avoid-low-level-calls
            (bool success, bytes memory result) = address(token).call(
                abi.encodePacked(IERC20Permit.permit.selector, permit)
            );
            if (!success) {
                string memory reason = RevertReasonParser.parse(
                    result,
                    "Permit call failed: "
                );
                if (token.allowance(msg.sender, address(this)) < amount) {
                    revert(reason);
                } else {
                    emit Error(reason);
                }
            }
        }
    }
}

File 3 of 8 : SafeMath.sol
// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b)
        internal
        pure
        returns (bool, uint256)
    {
        uint256 c = a + b;
        if (c < a) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b)
        internal
        pure
        returns (bool, uint256)
    {
        if (b > a) return (false, 0);
        return (true, a - b);
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b)
        internal
        pure
        returns (bool, uint256)
    {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) return (true, 0);
        uint256 c = a * b;
        if (c / a != b) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b)
        internal
        pure
        returns (bool, uint256)
    {
        if (b == 0) return (false, 0);
        return (true, a / b);
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b)
        internal
        pure
        returns (bool, uint256)
    {
        if (b == 0) return (false, 0);
        return (true, a % b);
    }

    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a, "SafeMath: subtraction overflow");
        return a - b;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) return 0;
        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting 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) {
        require(b > 0, "SafeMath: division by zero");
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. 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 mod(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: modulo by zero");
        return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        return a - b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryDiv}.
     *
     * 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);
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. 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 mod(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a % b;
    }
}

File 4 of 8 : Ownable.sol
// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "contracts/Context.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(
        address indexed previousOwner,
        address indexed newOwner
    );

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() internal {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(
            newOwner != address(0),
            "Ownable: new owner is the zero address"
        );
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

File 5 of 8 : RevertReasonParser.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.6.12;

library RevertReasonParser {
    function parse(bytes memory data, string memory prefix)
        internal
        pure
        returns (string memory)
    {
        // https://solidity.readthedocs.io/en/latest/control-structures.html#revert
        // We assume that revert reason is abi-encoded as Error(string)

        // 68 = 4-byte selector 0x08c379a0 + 32 bytes offset + 32 bytes length
        if (
            data.length >= 68 &&
            data[0] == "\x08" &&
            data[1] == "\xc3" &&
            data[2] == "\x79" &&
            data[3] == "\xa0"
        ) {
            string memory reason;
            // solhint-disable no-inline-assembly
            assembly {
                // 68 = 32 bytes data length + 4-byte selector + 32 bytes offset
                reason := add(data, 68)
            }
            /*
                revert reason is padded up to 32 bytes with ABI encoder: Error(string)
                also sometimes there is extra 32 bytes of zeros padded in the end:
                https://github.com/ethereum/solidity/issues/10170
                because of that we can't check for equality and instead check
                that string length + extra 68 bytes is less than overall data length
            */
            require(
                data.length >= 68 + bytes(reason).length,
                "Invalid revert reason"
            );
            return string(abi.encodePacked(prefix, "Error(", reason, ")"));
        }
        // 36 = 4-byte selector 0x4e487b71 + 32 bytes integer
        else if (
            data.length == 36 &&
            data[0] == "\x4e" &&
            data[1] == "\x48" &&
            data[2] == "\x7b" &&
            data[3] == "\x71"
        ) {
            uint256 code;
            // solhint-disable no-inline-assembly
            assembly {
                // 36 = 32 bytes data length + 4-byte selector
                code := mload(add(data, 36))
            }
            return
                string(abi.encodePacked(prefix, "Panic(", _toHex(code), ")"));
        }

        return string(abi.encodePacked(prefix, "Unknown(", _toHex(data), ")"));
    }

    function _toHex(uint256 value) private pure returns (string memory) {
        return _toHex(abi.encodePacked(value));
    }

    function _toHex(bytes memory data) private pure returns (string memory) {
        bytes16 alphabet = 0x30313233343536373839616263646566;
        bytes memory str = new bytes(2 + data.length * 2);
        str[0] = "0";
        str[1] = "x";
        for (uint256 i = 0; i < data.length; i++) {
            str[2 * i + 2] = alphabet[uint8(data[i] >> 4)];
            str[2 * i + 3] = alphabet[uint8(data[i] & 0x0f)];
        }
        return string(str);
    }
}

File 6 of 8 : IERC20.sol
// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount)
        external
        returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender)
        external
        view
        returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external returns (bool);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(
        address indexed owner,
        address indexed spender,
        uint256 value
    );
}

File 7 of 8 : IERC20Permit.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.6.12;

interface IERC20Permit {
    function permit(
        address owner,
        address spender,
        uint256 amount,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;
}

File 8 of 8 : Context.sol
// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with GSN meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address payable) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

Settings
{
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

Contract Security Audit

Contract ABI

[{"anonymous":false,"inputs":[{"indexed":false,"internalType":"string","name":"reason","type":"string"}],"name":"Error","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"user","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"FeePayed","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"oldTreasury","type":"address"},{"indexed":false,"internalType":"address","name":"newTreasury","type":"address"}],"name":"TreasuryChanged","type":"event"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_treasury","type":"address"}],"name":"setTreasury","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"treasury","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"contract IERC20","name":"srcToken","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"minReturn","type":"uint256"},{"internalType":"bytes32[]","name":"","type":"bytes32[]"}],"name":"unoswap","outputs":[{"internalType":"uint256","name":"returnAmount","type":"uint256"}],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"contract IERC20","name":"srcToken","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"minReturn","type":"uint256"},{"internalType":"bytes32[]","name":"pools","type":"bytes32[]"},{"internalType":"bytes","name":"permit","type":"bytes"}],"name":"unoswapWithPermit","outputs":[{"internalType":"uint256","name":"returnAmount","type":"uint256"}],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"userFeeCharged","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"stateMutability":"payable","type":"receive"}]

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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.