ETH Price: $3,331.17 (-1.56%)
Gas: 18 Gwei

Contract

0x183c7D6439B0aBAE14c179a9391ff4db32D1F3EC
 

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$0.00

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From
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Buy192706232024-02-20 18:13:47160 days ago1708452827IN
0x183c7D64...b32D1F3EC
0.08699999 ETH0.006218336.81712591
Buy192545942024-02-18 12:08:59162 days ago1708258139IN
0x183c7D64...b32D1F3EC
0.03579999 ETH0.0036113724.24119094
Buy191567262024-02-04 18:28:23176 days ago1707071303IN
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1.29999999 ETH0.002712216.05717237
Buy191521112024-02-04 2:52:59177 days ago1707015179IN
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0.11795486 ETH0.0025598416.8636243
Buy191510592024-02-03 23:20:35177 days ago1707002435IN
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0.49999999 ETH0.0021454415.92652051
Buy191505502024-02-03 21:37:59177 days ago1706996279IN
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0.27 ETH0.0029937617.72791562
Buy191220932024-01-30 21:45:59181 days ago1706651159IN
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0.46999999 ETH0.0036134121.37194222
Buy189932472024-01-12 20:37:23199 days ago1705091843IN
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0.09999999 ETH0.002256424.58809263
Buy189932322024-01-12 20:34:23199 days ago1705091663IN
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1.6 ETH0.0019415721.16020104
Buy189865822024-01-11 22:13:59200 days ago1705011239IN
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0.4 ETH0.0036165821.39066612
Buy189062232023-12-31 15:01:59211 days ago1704034919IN
0x183c7D64...b32D1F3EC
0.225 ETH0.0025131318.52158766
Buy188954542023-12-30 2:43:35213 days ago1703904215IN
0x183c7D64...b32D1F3EC
0.69999999 ETH0.0024306318.04198954
Buy188953912023-12-30 2:30:47213 days ago1703903447IN
0x183c7D64...b32D1F3EC
1.99999999 ETH0.0025402216.73173797
Buy188857972023-12-28 18:09:59214 days ago1703786999IN
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1 ETH0.0039470929.09227514
Buy188857562023-12-28 18:01:47214 days ago1703786507IN
0x183c7D64...b32D1F3EC
0.4 ETH0.0050048631.75212289
Buy188344462023-12-21 13:09:35221 days ago1703164175IN
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0.09999999 ETH0.0068075144.83555305
Buy188012462023-12-16 21:18:47226 days ago1702761527IN
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1.49999998 ETH0.0064594243.92821681
Buy187874102023-12-14 22:39:59228 days ago1702593599IN
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0.9 ETH0.0074541749.0906761
Buy187854422023-12-14 16:03:23228 days ago1702569803IN
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2.2 ETH0.0080156852.78861849
Buy187837302023-12-14 10:16:35229 days ago1702548995IN
0x183c7D64...b32D1F3EC
1 ETH0.0059676539.30099004
Buy187663902023-12-11 23:59:35231 days ago1702339175IN
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0.09999999 ETH0.0066051640.67243234
Buy187205272023-12-05 13:46:11237 days ago1701783971IN
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0.17999999 ETH0.0135248689.09132588
Buy186977792023-12-02 9:19:35241 days ago1701508775IN
0x183c7D64...b32D1F3EC
1.49999999 ETH0.0071181246.88866375
Buy186516362023-11-25 22:18:23247 days ago1700950703IN
0x183c7D64...b32D1F3EC
0.41499999 ETH0.0031594823.45830582
Buy185691202023-11-14 9:02:47259 days ago1699952567IN
0x183c7D64...b32D1F3EC
0.005 ETH0.0042798825.34021473
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Parent Transaction Hash Block From To
192706232024-02-20 18:13:47160 days ago1708452827
0x183c7D64...b32D1F3EC
0.08699999 ETH
192545942024-02-18 12:08:59162 days ago1708258139
0x183c7D64...b32D1F3EC
0.03579999 ETH
191567262024-02-04 18:28:23176 days ago1707071303
0x183c7D64...b32D1F3EC
1.29999999 ETH
191521112024-02-04 2:52:59177 days ago1707015179
0x183c7D64...b32D1F3EC
0.11795486 ETH
191510592024-02-03 23:20:35177 days ago1707002435
0x183c7D64...b32D1F3EC
0.49999999 ETH
191505502024-02-03 21:37:59177 days ago1706996279
0x183c7D64...b32D1F3EC
0.27 ETH
191220932024-01-30 21:45:59181 days ago1706651159
0x183c7D64...b32D1F3EC
0.46999999 ETH
191220892024-01-30 21:45:11181 days ago1706651111
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0.46999999 ETH
191220892024-01-30 21:45:11181 days ago1706651111
0x183c7D64...b32D1F3EC
0.46999999 ETH
189932472024-01-12 20:37:23199 days ago1705091843
0x183c7D64...b32D1F3EC
0.09999999 ETH
189932472024-01-12 20:37:23199 days ago1705091843
0x183c7D64...b32D1F3EC
0.09999999 ETH
189932472024-01-12 20:37:23199 days ago1705091843
0x183c7D64...b32D1F3EC
0.09999999 ETH
189932322024-01-12 20:34:23199 days ago1705091663
0x183c7D64...b32D1F3EC
1.6 ETH
189932312024-01-12 20:34:11199 days ago1705091651
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1.6 ETH
189932312024-01-12 20:34:11199 days ago1705091651
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1.6 ETH
189865832024-01-11 22:14:11200 days ago1705011251
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0.4 ETH
189865832024-01-11 22:14:11200 days ago1705011251
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0.4 ETH
189865832024-01-11 22:14:11200 days ago1705011251
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0.4 ETH
189865832024-01-11 22:14:11200 days ago1705011251
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189865822024-01-11 22:13:59200 days ago1705011239
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0.4 ETH
189865822024-01-11 22:13:59200 days ago1705011239
0x183c7D64...b32D1F3EC
0.4 ETH
189865822024-01-11 22:13:59200 days ago1705011239
0x183c7D64...b32D1F3EC
0.4 ETH
189062232023-12-31 15:01:59211 days ago1704034919
0x183c7D64...b32D1F3EC
0.225 ETH
188954542023-12-30 2:43:35213 days ago1703904215
0x183c7D64...b32D1F3EC
0.69999999 ETH
188953912023-12-30 2:30:47213 days ago1703903447
0x183c7D64...b32D1F3EC
1.99999999 ETH
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Contract Source Code Verified (Exact Match)

Contract Name:
Erc20SaleWeth

Compiler Version
v0.8.17+commit.8df45f5f

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion
File 1 of 8 : Erc20SaleWeth.sol
// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.8.17;

import './Erc20Sale.sol';
import '../weth/IgWETH.sol';

contract Erc20SaleWeth {
    Erc20Sale immutable _sale;
    IgWETH immutable _weth;

    constructor(address saleAlg, address weth) {
        _sale = Erc20Sale(saleAlg);
        _weth = IgWETH(weth);
    }

    function getSaleAlg() external view returns (address) {
        return address(_sale);
    }

    function buy(
        uint256 positionId,
        address to,
        uint256 count,
        uint256 priceNom,
        uint256 priceDenom
    ) external payable {
        PositionData memory position = _sale.getPosition(positionId);
        require(
            position.asset2 == address(_weth),
            'sale position is not require eth for purchase'
        );
        uint256 toSpend = _sale.spendToBuy(positionId, count);
        require(msg.value >= toSpend, 'not enough ether');
        uint256 dif = msg.value - toSpend;
        _weth.mint{ value: toSpend }();
        _sale.buy(positionId, to, count, priceNom, priceDenom);
        if (dif > 0) {
            (bool sent, ) = payable(msg.sender).call{ value: dif }('');
            require(sent, 'sent ether error: ether is not sent');
        }
    }
}

File 2 of 8 : Erc20Sale.sol
// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.8.17;

import '@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol';
import '@openzeppelin/contracts/token/ERC20/IERC20.sol';
import 'contracts/fee/IFeeSettings.sol';

struct PositionData {
    address owner;
    address asset1;
    address asset2;
    uint256 priceNom;
    uint256 priceDenom;
    uint256 count1;
    uint256 count2;
}

contract Erc20Sale {
    using SafeERC20 for IERC20;

    IFeeSettings immutable _feeSettings;
    mapping(uint256 => PositionData) _positions;
    uint256 _totalPositions;

    constructor(address feeSettings) {
        _feeSettings = IFeeSettings(feeSettings);
    }

    event OnCreate(
        uint256 indexed positionId,
        address indexed owner,
        address asset1,
        address asset2,
        uint256 priceNom,
        uint256 priceDenom
    );
    event OnBuy(
        uint256 indexed positionId,
        address indexed account,
        uint256 count
    );
    event OnPrice(
        uint256 indexed positionId,
        uint256 priceNom,
        uint256 priceDenom
    );
    event OnWithdraw(
        uint256 indexed positionId,
        uint256 assetCode,
        address to,
        uint256 count
    );

    function createAsset(
        address asset1,
        address asset2,
        uint256 priceNom,
        uint256 priceDenom,
        uint256 count
    ) external {
        if (count > 0) {
            uint256 lastCount = IERC20(asset1).balanceOf(address(this));
            IERC20(asset1).safeTransferFrom(msg.sender, address(this), count);
            count = IERC20(asset1).balanceOf(address(this)) - lastCount;
        }

        _positions[++_totalPositions] = PositionData(
            msg.sender,
            asset1,
            asset2,
            priceNom,
            priceDenom,
            count,
            0
        );

        emit OnCreate(
            _totalPositions,
            msg.sender,
            asset1,
            asset2,
            priceNom,
            priceDenom
        );
    }

    function addBalance(uint256 positionId, uint256 count) external {
        PositionData storage pos = _positions[positionId];
        uint256 lastCount = IERC20(pos.asset1).balanceOf(address(this));
        IERC20(pos.asset1).safeTransferFrom(msg.sender, address(this), count);
        pos.count1 += IERC20(pos.asset1).balanceOf(address(this)) - lastCount;
    }

    function withdraw(
        uint256 positionId,
        uint256 assetCode,
        address to,
        uint256 count
    ) external {
        PositionData storage pos = _positions[positionId];
        require(pos.owner == msg.sender, 'only for position owner');
        uint256 fee = (_feeSettings.feePercent() * count) /
            _feeSettings.feeDecimals();
        uint256 toWithdraw = count - fee;
        if (assetCode == 1) {
            require(pos.count1 >= count, 'not enough asset count');
            uint256 lastCount = IERC20(pos.asset1).balanceOf(address(this));
            IERC20(pos.asset1).safeTransfer(_feeSettings.feeAddress(), fee);
            IERC20(pos.asset1).safeTransfer(to, toWithdraw);
            uint256 transferred = lastCount -
                IERC20(pos.asset1).balanceOf(address(this));
            require(
                pos.count1 >= transferred,
                'not enough asset count after withdraw'
            );
            pos.count1 -= transferred;
        } else if (assetCode == 2) {
            require(pos.count2 >= count, 'not enough asset count');
            uint256 lastCount = IERC20(pos.asset2).balanceOf(address(this));
            IERC20(pos.asset2).safeTransfer(_feeSettings.feeAddress(), fee);
            IERC20(pos.asset2).safeTransfer(to, toWithdraw);
            uint256 transferred = lastCount -
                IERC20(pos.asset2).balanceOf(address(this));
            require(
                pos.count2 >= transferred,
                'not enough asset count after withdraw'
            );
            pos.count2 -= transferred;
        } else revert('unknown asset code');

        emit OnWithdraw(positionId, assetCode, to, count);
    }

    function setPrice(
        uint256 positionId,
        uint256 priceNom,
        uint256 priceDenom
    ) external {
        PositionData storage pos = _positions[positionId];
        require(pos.owner == msg.sender, 'only for position owner');
        pos.priceNom = priceNom;
        pos.priceDenom = priceDenom;
        emit OnPrice(positionId, priceNom, priceDenom);
    }

    function buy(
        uint256 positionId,
        address to,
        uint256 count,
        uint256 priceNom,
        uint256 priceDenom
    ) external {
        PositionData storage pos = _positions[positionId];
        // price frontrun protection
        require(
            pos.priceNom == priceNom && pos.priceDenom == priceDenom,
            'the price is changed'
        );
        uint256 spend = _spendToBuy(pos, count);
        require(
            spend > 0,
            'spend asset count is zero (count parameter is less than minimum count to spend)'
        );
        uint256 buyFee = (count * _feeSettings.feePercent()) /
            _feeSettings.feeDecimals();
        uint256 buyToTransfer = count - buyFee;

        // transfer buy
        require(pos.count1 >= count, 'not enough asset count at position');
        uint256 lastCount = IERC20(pos.asset1).balanceOf(address(this));
        IERC20(pos.asset1).safeTransfer(_feeSettings.feeAddress(), buyFee);
        IERC20(pos.asset1).safeTransfer(to, buyToTransfer);
        uint256 transferred = lastCount -
            IERC20(pos.asset1).balanceOf(address(this));
        require(
            pos.count1 >= transferred,
            'not enough asset count after withdraw'
        );
        pos.count1 -= transferred;

        // transfer spend
        lastCount = IERC20(pos.asset2).balanceOf(address(this));
        IERC20(pos.asset2).safeTransferFrom(msg.sender, address(this), spend);
        pos.count2 += IERC20(pos.asset2).balanceOf(address(this)) - lastCount;

        // emit event
        emit OnBuy(positionId, to, count);
    }

    function spendToBuy(uint256 positionId, uint256 count)
        external
        view
        returns (uint256)
    {
        return _spendToBuy(_positions[positionId], count);
    }

    function _spendToBuy(PositionData memory pos, uint256 count)
        private
        pure
        returns (uint256)
    {
        return (count * pos.priceNom) / pos.priceDenom;
    }

    function getPosition(uint256 positionId)
        external
        view
        returns (PositionData memory)
    {
        return _positions[positionId];
    }
}

File 3 of 8 : IgWETH.sol
// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.8.17;

import '@openzeppelin/contracts/token/ERC20/IERC20.sol';

interface IgWETH {
    function mint() external payable;
    function mintTo(address account) external payable;
    function unwrap(uint256 amount) external;
}

File 4 of 8 : SafeERC20.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";
import "../extensions/draft-IERC20Permit.sol";
import "../../../utils/Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using Address for address;

    function safeTransfer(
        IERC20 token,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(
        IERC20 token,
        address from,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        uint256 newAllowance = token.allowance(address(this), spender) + value;
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            uint256 newAllowance = oldAllowance - value;
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
        }
    }

    function safePermit(
        IERC20Permit token,
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        uint256 nonceBefore = token.nonces(owner);
        token.permit(owner, spender, value, deadline, v, r, s);
        uint256 nonceAfter = token.nonces(owner);
        require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) {
            // Return data is optional
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

File 5 of 8 : IERC20.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @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);

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

File 6 of 8 : IFeeSettings.sol
// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.8.17;

interface IFeeSettings {
    function feeAddress() external returns (address); // address to pay fee

    function feePercent() external returns (uint256); // fee in 1/decimals for deviding values

    function feeDecimals() external view returns(uint256); // fee decimals

    function feeEth() external returns (uint256); // fee value for not dividing deal points
}

File 7 of 8 : draft-IERC20Permit.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/draft-IERC20Permit.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 */
interface IERC20Permit {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @dev Returns the current nonce for `owner`. This value must be
     * included whenever a signature is generated for {permit}.
     *
     * Every successful call to {permit} increases ``owner``'s nonce by one. This
     * prevents a signature from being used multiple times.
     */
    function nonces(address owner) external view returns (uint256);

    /**
     * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view returns (bytes32);
}

File 8 of 8 : Address.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");

        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly
                /// @solidity memory-safe-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

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

Contract Security Audit

Contract ABI

[{"inputs":[{"internalType":"address","name":"saleAlg","type":"address"},{"internalType":"address","name":"weth","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[{"internalType":"uint256","name":"positionId","type":"uint256"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"count","type":"uint256"},{"internalType":"uint256","name":"priceNom","type":"uint256"},{"internalType":"uint256","name":"priceDenom","type":"uint256"}],"name":"buy","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"getSaleAlg","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"}]

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Deployed Bytecode

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

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

000000000000000000000000b47376a8ad9f00eb30f9a21b53c148fb351416b60000000000000000000000007a96126938a37f3e5bf73844aec57d1974d528c6

-----Decoded View---------------
Arg [0] : saleAlg (address): 0xb47376A8aD9F00Eb30F9A21B53c148Fb351416b6
Arg [1] : weth (address): 0x7a96126938A37f3E5bf73844AeC57d1974D528C6

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 000000000000000000000000b47376a8ad9f00eb30f9a21b53c148fb351416b6
Arg [1] : 0000000000000000000000007a96126938a37f3e5bf73844aec57d1974d528c6


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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.