Contract Address Details

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.29;

import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/ReentrancyGuard.sol";

interface IPulseXRouter {
    function factory() external pure returns (address);
    function WPLS() external pure returns (address);
    
    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
}

interface IPulseXFactory {
    function createPair(address tokenA, address tokenB) external returns (address pair);
    function getPair(address tokenA, address tokenB) external view returns (address pair);
}

/**
 * @title PulseX402
 * @notice ERC20 token with USDC-based minting and automatic tax system
 * @dev Features:
 *      - 5,000 tokens for public minting (10 USDC per 10 tokens = $1 per token)
 *      - 5,000 tokens reserved for owner LP allocation
 *      - 5% buy tax / 5% sell tax (auto-swapped to PLS)
 *      - Tax sent to marketing wallet
 *      - PulseX V2 integration for trading
 */
contract PulseX402 is ERC20, Ownable, ReentrancyGuard {
    // Constants
    uint256 public constant TOTAL_SUPPLY = 10_000 * 10**18; // 10,000 tokens
    uint256 public constant PUBLIC_MINT_ALLOCATION = 5_000 * 10**18; // 5,000 for public
    uint256 public constant LP_ALLOCATION = 5_000 * 10**18; // 5,000 for LP
    uint256 public constant TOKENS_PER_MINT = 10 * 10**18; // 10 tokens per mint
    uint256 public constant USDC_PRICE_PER_MINT = 10 * 10**6; // 10 USDC (6 decimals)
    uint256 public constant MAX_MINTS = 500; // 5,000 / 10 = 500 mints

    // Tax configuration
    uint256 public buyTax = 500; // 5% (500/10000)
    uint256 public sellTax = 500; // 5% (500/10000)
    uint256 public constant TAX_DENOMINATOR = 10000;
    uint256 public swapTokensAtAmount = 1000 * 10**18; // Swap when 1000 tokens accumulated

    // State variables
    IERC20 public immutable usdcToken;
    IPulseXRouter public pulseXRouter;
    address public pulseXPair;
    address public marketingWallet;
    
    uint256 public totalMinted;
    uint256 public mintCounter;
    bool public mintingPaused;
    bool public lpTokensWithdrawn;
    bool public tradingEnabled;
    bool private inSwap;

    // Tax exclusions
    mapping(address => bool) public isExcludedFromTax;
    mapping(address => bool) public isAutomatedMarketMakerPair;

    // Events
    event TokensMinted(address indexed user, uint256 amount, uint256 usdcPaid, uint256 mintNumber);
    event UsdcWithdrawn(address indexed owner, uint256 amount);
    event LpTokensWithdrawn(address indexed owner, uint256 amount);
    event MintingPausedEvent(bool paused);
    event TradingEnabled(uint256 timestamp);
    event TaxUpdated(uint256 buyTax, uint256 sellTax);
    event MarketingWalletUpdated(address indexed newWallet);
    event SwapAndSendMarketing(uint256 tokensSwapped, uint256 plsReceived);
    event ExcludedFromTax(address indexed account, bool excluded);
    event SetAutomatedMarketMakerPair(address indexed pair, bool indexed value);

    // Errors
    error MintingIsPaused();
    error MintingComplete();
    error UsdcTransferFailed();
    error NoUsdcToWithdraw();
    error LpTokensAlreadyWithdrawn();
    error NoLpTokensToWithdraw();
    error TradingNotEnabled();
    error InvalidTaxValue();
    error ZeroAddress();

    modifier lockTheSwap {
        inSwap = true;
        _;
        inSwap = false;
    }

    /**
     * @notice Constructor initializes the token for PulseChain Mainnet
     */
    constructor() ERC20("PulseX 402", "PX402") Ownable(0xC0B6ad22808e02785418335F07E6B09E98559339) {
        // PulseChain Mainnet (369)
        uint256 _chainId = 369;
        
        // Get USDC address based on chain ID
        address usdcAddress = getUsdcAddress(_chainId);
        usdcToken = IERC20(usdcAddress);

        // Set marketing wallet
        marketingWallet = 0xC0B6ad22808e02785418335F07E6B09E98559339;

        // Initialize PulseX Router
        address routerAddress = getPulseXRouter(_chainId);
        pulseXRouter = IPulseXRouter(routerAddress);

        // Create PulseX pair
        address factory = pulseXRouter.factory();
        address wpls = pulseXRouter.WPLS();
        pulseXPair = IPulseXFactory(factory).createPair(address(this), wpls);
        isAutomatedMarketMakerPair[pulseXPair] = true;

        // Exclude from tax
        isExcludedFromTax[0xC0B6ad22808e02785418335F07E6B09E98559339] = true;
        isExcludedFromTax[address(this)] = true;
        isExcludedFromTax[marketingWallet] = true;
        isExcludedFromTax[address(0)] = true;

        // Mint total supply to contract
        _mint(address(this), TOTAL_SUPPLY);
    }

    /**
     * @notice Get USDC address for specific chain
     */
    function getUsdcAddress(uint256 chainId) internal pure returns (address) {
        if (chainId == 369) { // PulseChain Mainnet
            return 0x15D38573d2feeb82e7ad5187aB8c1D52810B1f07;
        } else if (chainId == 943) { // PulseChain Testnet
            return 0x15D38573d2feeb82e7ad5187aB8c1D52810B1f07;
        } else if (chainId == 1 || chainId == 20258) { // Ethereum mainnet or testnet
            return 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48;
        } else if (chainId == 11155111) { // Ethereum Sepolia
            return 0x1c7D4B196Cb0C7B01d743Fbc6116a902379C7238;
        }
        revert("Unsupported chain");
    }

    /**
     * @notice Get PulseX Router address for specific chain
     */
    function getPulseXRouter(uint256 chainId) internal pure returns (address) {
        if (chainId == 369) { // PulseChain Mainnet
            return 0x165C3410fC91EF562C50559f7d2289fEbed552d9; // PulseX V2 Router (correct address)
        } else if (chainId == 943) { // PulseChain Testnet
            return 0xDaE9dd3d1A52CfCe9d5F2fAC7fDe164D500E50f7; // PulseX V2 Testnet Router
        }
        revert("Unsupported chain for PulseX");
    }

    /**
     * @notice Override transfer to implement tax system
     */
    function _update(address from, address to, uint256 amount) internal override {
        // Allow transfers during minting phase or if trading is enabled
        if (from != address(0) && to != address(0)) {
            if (!tradingEnabled && !isExcludedFromTax[from] && !isExcludedFromTax[to]) {
                revert TradingNotEnabled();
            }
        }

        // Check if we should take tax
        bool takeTax = tradingEnabled && !inSwap && !isExcludedFromTax[from] && !isExcludedFromTax[to];

        if (takeTax) {
            uint256 taxAmount = 0;

            // Buy tax (from pair to user)
            if (isAutomatedMarketMakerPair[from] && buyTax > 0) {
                taxAmount = (amount * buyTax) / TAX_DENOMINATOR;
            }
            // Sell tax (from user to pair)
            else if (isAutomatedMarketMakerPair[to] && sellTax > 0) {
                taxAmount = (amount * sellTax) / TAX_DENOMINATOR;
            }

            if (taxAmount > 0) {
                super._update(from, address(this), taxAmount);
                amount -= taxAmount;
            }

            // Auto-swap accumulated tax to PLS
            uint256 contractBalance = balanceOf(address(this));
            uint256 mintableTokens = (MAX_MINTS - mintCounter) * TOKENS_PER_MINT;
            uint256 taxTokens = contractBalance > mintableTokens ? contractBalance - mintableTokens : 0;

            if (taxTokens >= swapTokensAtAmount && !isAutomatedMarketMakerPair[from]) {
                swapTokensForPLS(taxTokens);
            }
        }

        super._update(from, to, amount);
    }

    /**
     * @notice Swap accumulated tax tokens for PLS and send to marketing wallet
     */
    function swapTokensForPLS(uint256 tokenAmount) private lockTheSwap {
        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = pulseXRouter.WPLS();

        _approve(address(this), address(pulseXRouter), tokenAmount);

        uint256 initialBalance = address(this).balance;

        pulseXRouter.swapExactTokensForETHSupportingFeeOnTransferTokens(
            tokenAmount,
            0,
            path,
            address(this),
            block.timestamp
        );

        uint256 plsReceived = address(this).balance - initialBalance;

        if (plsReceived > 0) {
            (bool success, ) = marketingWallet.call{value: plsReceived}("");
            require(success, "Marketing transfer failed");
            emit SwapAndSendMarketing(tokenAmount, plsReceived);
        }
    }

    /**
     * @notice Public mint function - users pay USDC to receive tokens
     */
    function mint() external nonReentrant {
        if (mintingPaused) revert MintingIsPaused();
        if (mintCounter >= MAX_MINTS) revert MintingComplete();

        // Transfer USDC from user to contract
        bool success = usdcToken.transferFrom(msg.sender, address(this), USDC_PRICE_PER_MINT);
        if (!success) revert UsdcTransferFailed();

        // Increment counters
        mintCounter++;
        totalMinted += TOKENS_PER_MINT;

        // Transfer tokens to user
        _transfer(address(this), msg.sender, TOKENS_PER_MINT);

        emit TokensMinted(msg.sender, TOKENS_PER_MINT, USDC_PRICE_PER_MINT, mintCounter);
    }

    /**
     * @notice Owner enables trading (one-time action)
     */
    function enableTrading() external onlyOwner {
        require(!tradingEnabled, "Trading already enabled");
        tradingEnabled = true;
        emit TradingEnabled(block.timestamp);
    }

    /**
     * @notice Owner withdraws collected USDC
     */
    function withdrawUsdc() external onlyOwner nonReentrant {
        uint256 balance = usdcToken.balanceOf(address(this));
        if (balance == 0) revert NoUsdcToWithdraw();

        bool success = usdcToken.transfer(owner(), balance);
        if (!success) revert UsdcTransferFailed();

        emit UsdcWithdrawn(owner(), balance);
    }

    /**
     * @notice Owner withdraws LP allocation tokens (5,000 tokens)
     */
    function withdrawLpTokens() external onlyOwner nonReentrant {
        if (lpTokensWithdrawn) revert LpTokensAlreadyWithdrawn();

        uint256 lpBalance = balanceOf(address(this));
        if (lpBalance == 0) revert NoLpTokensToWithdraw();

        // Calculate available LP tokens (total balance minus remaining mintable tokens and tax)
        uint256 remainingMintable = (MAX_MINTS - mintCounter) * TOKENS_PER_MINT;
        uint256 availableLpTokens = lpBalance > remainingMintable ? lpBalance - remainingMintable : 0;

        if (availableLpTokens == 0) revert NoLpTokensToWithdraw();

        lpTokensWithdrawn = true;
        _transfer(address(this), owner(), availableLpTokens);

        emit LpTokensWithdrawn(owner(), availableLpTokens);
    }

    /**
     * @notice Owner updates tax rates
     */
    function updateTaxes(uint256 _buyTax, uint256 _sellTax) external onlyOwner {
        if (_buyTax > 1000 || _sellTax > 1000) revert InvalidTaxValue(); // Max 10%
        buyTax = _buyTax;
        sellTax = _sellTax;
        emit TaxUpdated(_buyTax, _sellTax);
    }

    /**
     * @notice Owner updates marketing wallet
     */
    function updateMarketingWallet(address _marketingWallet) external onlyOwner {
        if (_marketingWallet == address(0)) revert ZeroAddress();
        marketingWallet = _marketingWallet;
        emit MarketingWalletUpdated(_marketingWallet);
    }

    /**
     * @notice Owner excludes/includes address from tax
     */
    function setExcludedFromTax(address account, bool excluded) external onlyOwner {
        isExcludedFromTax[account] = excluded;
        emit ExcludedFromTax(account, excluded);
    }

    /**
     * @notice Owner sets automated market maker pair
     */
    function setAutomatedMarketMakerPair(address pair, bool value) external onlyOwner {
        isAutomatedMarketMakerPair[pair] = value;
        emit SetAutomatedMarketMakerPair(pair, value);
    }

    /**
     * @notice Owner pauses or unpauses minting
     */
    function setMintingPaused(bool _paused) external onlyOwner {
        mintingPaused = _paused;
        emit MintingPausedEvent(_paused);
    }

    /**
     * @notice Update swap threshold
     */
    function updateSwapTokensAtAmount(uint256 _amount) external onlyOwner {
        swapTokensAtAmount = _amount;
    }

    /**
     * @notice Manual swap and send to marketing
     */
    function manualSwapAndSend() external onlyOwner {
        uint256 contractBalance = balanceOf(address(this));
        uint256 mintableTokens = (MAX_MINTS - mintCounter) * TOKENS_PER_MINT;
        uint256 taxTokens = contractBalance > mintableTokens ? contractBalance - mintableTokens : 0;
        
        require(taxTokens > 0, "No tax tokens to swap");
        swapTokensForPLS(taxTokens);
    }

    /**
     * @notice Get remaining mints available
     */
    function remainingMints() external view returns (uint256) {
        return MAX_MINTS - mintCounter;
    }

    /**
     * @notice Get remaining tokens available for minting
     */
    function remainingTokens() external view returns (uint256) {
        return PUBLIC_MINT_ALLOCATION - totalMinted;
    }

    /**
     * @notice Get total USDC collected
     */
    function collectedUsdc() external view returns (uint256) {
        return usdcToken.balanceOf(address(this));
    }

    /**
     * @notice Receive PLS from swaps
     */
    receive() external payable {}
}
        

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity >=0.6.2;

import {IERC20} from "../IERC20.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC-20 standard.
 */
interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}
          

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.1) (utils/Context.sol)

pragma solidity ^0.8.20;

/**
 * @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 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) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }

    function _contextSuffixLength() internal view virtual returns (uint256) {
        return 0;
    }
}
          

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (interfaces/draft-IERC6093.sol)
pragma solidity >=0.8.4;

/**
 * @dev Standard ERC-20 Errors
 * Interface of the https://eips.ethereum.org/EIPS/eip-6093[ERC-6093] custom errors for ERC-20 tokens.
 */
interface IERC20Errors {
    /**
     * @dev Indicates an error related to the current `balance` of a `sender`. Used in transfers.
     * @param sender Address whose tokens are being transferred.
     * @param balance Current balance for the interacting account.
     * @param needed Minimum amount required to perform a transfer.
     */
    error ERC20InsufficientBalance(address sender, uint256 balance, uint256 needed);

    /**
     * @dev Indicates a failure with the token `sender`. Used in transfers.
     * @param sender Address whose tokens are being transferred.
     */
    error ERC20InvalidSender(address sender);

    /**
     * @dev Indicates a failure with the token `receiver`. Used in transfers.
     * @param receiver Address to which tokens are being transferred.
     */
    error ERC20InvalidReceiver(address receiver);

    /**
     * @dev Indicates a failure with the `spender`’s `allowance`. Used in transfers.
     * @param spender Address that may be allowed to operate on tokens without being their owner.
     * @param allowance Amount of tokens a `spender` is allowed to operate with.
     * @param needed Minimum amount required to perform a transfer.
     */
    error ERC20InsufficientAllowance(address spender, uint256 allowance, uint256 needed);

    /**
     * @dev Indicates a failure with the `approver` of a token to be approved. Used in approvals.
     * @param approver Address initiating an approval operation.
     */
    error ERC20InvalidApprover(address approver);

    /**
     * @dev Indicates a failure with the `spender` to be approved. Used in approvals.
     * @param spender Address that may be allowed to operate on tokens without being their owner.
     */
    error ERC20InvalidSpender(address spender);
}

/**
 * @dev Standard ERC-721 Errors
 * Interface of the https://eips.ethereum.org/EIPS/eip-6093[ERC-6093] custom errors for ERC-721 tokens.
 */
interface IERC721Errors {
    /**
     * @dev Indicates that an address can't be an owner. For example, `address(0)` is a forbidden owner in ERC-20.
     * Used in balance queries.
     * @param owner Address of the current owner of a token.
     */
    error ERC721InvalidOwner(address owner);

    /**
     * @dev Indicates a `tokenId` whose `owner` is the zero address.
     * @param tokenId Identifier number of a token.
     */
    error ERC721NonexistentToken(uint256 tokenId);

    /**
     * @dev Indicates an error related to the ownership over a particular token. Used in transfers.
     * @param sender Address whose tokens are being transferred.
     * @param tokenId Identifier number of a token.
     * @param owner Address of the current owner of a token.
     */
    error ERC721IncorrectOwner(address sender, uint256 tokenId, address owner);

    /**
     * @dev Indicates a failure with the token `sender`. Used in transfers.
     * @param sender Address whose tokens are being transferred.
     */
    error ERC721InvalidSender(address sender);

    /**
     * @dev Indicates a failure with the token `receiver`. Used in transfers.
     * @param receiver Address to which tokens are being transferred.
     */
    error ERC721InvalidReceiver(address receiver);

    /**
     * @dev Indicates a failure with the `operator`’s approval. Used in transfers.
     * @param operator Address that may be allowed to operate on tokens without being their owner.
     * @param tokenId Identifier number of a token.
     */
    error ERC721InsufficientApproval(address operator, uint256 tokenId);

    /**
     * @dev Indicates a failure with the `approver` of a token to be approved. Used in approvals.
     * @param approver Address initiating an approval operation.
     */
    error ERC721InvalidApprover(address approver);

    /**
     * @dev Indicates a failure with the `operator` to be approved. Used in approvals.
     * @param operator Address that may be allowed to operate on tokens without being their owner.
     */
    error ERC721InvalidOperator(address operator);
}

/**
 * @dev Standard ERC-1155 Errors
 * Interface of the https://eips.ethereum.org/EIPS/eip-6093[ERC-6093] custom errors for ERC-1155 tokens.
 */
interface IERC1155Errors {
    /**
     * @dev Indicates an error related to the current `balance` of a `sender`. Used in transfers.
     * @param sender Address whose tokens are being transferred.
     * @param balance Current balance for the interacting account.
     * @param needed Minimum amount required to perform a transfer.
     * @param tokenId Identifier number of a token.
     */
    error ERC1155InsufficientBalance(address sender, uint256 balance, uint256 needed, uint256 tokenId);

    /**
     * @dev Indicates a failure with the token `sender`. Used in transfers.
     * @param sender Address whose tokens are being transferred.
     */
    error ERC1155InvalidSender(address sender);

    /**
     * @dev Indicates a failure with the token `receiver`. Used in transfers.
     * @param receiver Address to which tokens are being transferred.
     */
    error ERC1155InvalidReceiver(address receiver);

    /**
     * @dev Indicates a failure with the `operator`’s approval. Used in transfers.
     * @param operator Address that may be allowed to operate on tokens without being their owner.
     * @param owner Address of the current owner of a token.
     */
    error ERC1155MissingApprovalForAll(address operator, address owner);

    /**
     * @dev Indicates a failure with the `approver` of a token to be approved. Used in approvals.
     * @param approver Address initiating an approval operation.
     */
    error ERC1155InvalidApprover(address approver);

    /**
     * @dev Indicates a failure with the `operator` to be approved. Used in approvals.
     * @param operator Address that may be allowed to operate on tokens without being their owner.
     */
    error ERC1155InvalidOperator(address operator);

    /**
     * @dev Indicates an array length mismatch between ids and values in a safeBatchTransferFrom operation.
     * Used in batch transfers.
     * @param idsLength Length of the array of token identifiers
     * @param valuesLength Length of the array of token amounts
     */
    error ERC1155InvalidArrayLength(uint256 idsLength, uint256 valuesLength);
}
          

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (token/ERC20/ERC20.sol)

pragma solidity ^0.8.20;

import {IERC20} from "./IERC20.sol";
import {IERC20Metadata} from "./extensions/IERC20Metadata.sol";
import {Context} from "../../utils/Context.sol";
import {IERC20Errors} from "../../interfaces/draft-IERC6093.sol";

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.openzeppelin.com/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * The default value of {decimals} is 18. To change this, you should override
 * this function so it returns a different value.
 *
 * We have followed general OpenZeppelin Contracts guidelines: functions revert
 * instead returning `false` on failure. This behavior is nonetheless
 * conventional and does not conflict with the expectations of ERC-20
 * applications.
 */
abstract contract ERC20 is Context, IERC20, IERC20Metadata, IERC20Errors {
    mapping(address account => uint256) private _balances;

    mapping(address account => mapping(address spender => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * Both values are immutable: they can only be set once during construction.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5.05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the default value returned by this function, unless
     * it's overridden.
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual returns (uint8) {
        return 18;
    }

    /// @inheritdoc IERC20
    function totalSupply() public view virtual returns (uint256) {
        return _totalSupply;
    }

    /// @inheritdoc IERC20
    function balanceOf(address account) public view virtual returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - the caller must have a balance of at least `value`.
     */
    function transfer(address to, uint256 value) public virtual returns (bool) {
        address owner = _msgSender();
        _transfer(owner, to, value);
        return true;
    }

    /// @inheritdoc IERC20
    function allowance(address owner, address spender) public view virtual returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * NOTE: If `value` is the maximum `uint256`, the allowance is not updated on
     * `transferFrom`. This is semantically equivalent to an infinite approval.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 value) public virtual returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, value);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Skips emitting an {Approval} event indicating an allowance update. This is not
     * required by the ERC. See {xref-ERC20-_approve-address-address-uint256-bool-}[_approve].
     *
     * NOTE: Does not update the allowance if the current allowance
     * is the maximum `uint256`.
     *
     * Requirements:
     *
     * - `from` and `to` cannot be the zero address.
     * - `from` must have a balance of at least `value`.
     * - the caller must have allowance for ``from``'s tokens of at least
     * `value`.
     */
    function transferFrom(address from, address to, uint256 value) public virtual returns (bool) {
        address spender = _msgSender();
        _spendAllowance(from, spender, value);
        _transfer(from, to, value);
        return true;
    }

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to`.
     *
     * This internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * NOTE: This function is not virtual, {_update} should be overridden instead.
     */
    function _transfer(address from, address to, uint256 value) internal {
        if (from == address(0)) {
            revert ERC20InvalidSender(address(0));
        }
        if (to == address(0)) {
            revert ERC20InvalidReceiver(address(0));
        }
        _update(from, to, value);
    }

    /**
     * @dev Transfers a `value` amount of tokens from `from` to `to`, or alternatively mints (or burns) if `from`
     * (or `to`) is the zero address. All customizations to transfers, mints, and burns should be done by overriding
     * this function.
     *
     * Emits a {Transfer} event.
     */
    function _update(address from, address to, uint256 value) internal virtual {
        if (from == address(0)) {
            // Overflow check required: The rest of the code assumes that totalSupply never overflows
            _totalSupply += value;
        } else {
            uint256 fromBalance = _balances[from];
            if (fromBalance < value) {
                revert ERC20InsufficientBalance(from, fromBalance, value);
            }
            unchecked {
                // Overflow not possible: value <= fromBalance <= totalSupply.
                _balances[from] = fromBalance - value;
            }
        }

        if (to == address(0)) {
            unchecked {
                // Overflow not possible: value <= totalSupply or value <= fromBalance <= totalSupply.
                _totalSupply -= value;
            }
        } else {
            unchecked {
                // Overflow not possible: balance + value is at most totalSupply, which we know fits into a uint256.
                _balances[to] += value;
            }
        }

        emit Transfer(from, to, value);
    }

    /**
     * @dev Creates a `value` amount of tokens and assigns them to `account`, by transferring it from address(0).
     * Relies on the `_update` mechanism
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * NOTE: This function is not virtual, {_update} should be overridden instead.
     */
    function _mint(address account, uint256 value) internal {
        if (account == address(0)) {
            revert ERC20InvalidReceiver(address(0));
        }
        _update(address(0), account, value);
    }

    /**
     * @dev Destroys a `value` amount of tokens from `account`, lowering the total supply.
     * Relies on the `_update` mechanism.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * NOTE: This function is not virtual, {_update} should be overridden instead
     */
    function _burn(address account, uint256 value) internal {
        if (account == address(0)) {
            revert ERC20InvalidSender(address(0));
        }
        _update(account, address(0), value);
    }

    /**
     * @dev Sets `value` as the allowance of `spender` over the `owner`'s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     *
     * Overrides to this logic should be done to the variant with an additional `bool emitEvent` argument.
     */
    function _approve(address owner, address spender, uint256 value) internal {
        _approve(owner, spender, value, true);
    }

    /**
     * @dev Variant of {_approve} with an optional flag to enable or disable the {Approval} event.
     *
     * By default (when calling {_approve}) the flag is set to true. On the other hand, approval changes made by
     * `_spendAllowance` during the `transferFrom` operation set the flag to false. This saves gas by not emitting any
     * `Approval` event during `transferFrom` operations.
     *
     * Anyone who wishes to continue emitting `Approval` events on the`transferFrom` operation can force the flag to
     * true using the following override:
     *
     * ```solidity
     * function _approve(address owner, address spender, uint256 value, bool) internal virtual override {
     *     super._approve(owner, spender, value, true);
     * }
     * ```
     *
     * Requirements are the same as {_approve}.
     */
    function _approve(address owner, address spender, uint256 value, bool emitEvent) internal virtual {
        if (owner == address(0)) {
            revert ERC20InvalidApprover(address(0));
        }
        if (spender == address(0)) {
            revert ERC20InvalidSpender(address(0));
        }
        _allowances[owner][spender] = value;
        if (emitEvent) {
            emit Approval(owner, spender, value);
        }
    }

    /**
     * @dev Updates `owner`'s allowance for `spender` based on spent `value`.
     *
     * Does not update the allowance value in case of infinite allowance.
     * Revert if not enough allowance is available.
     *
     * Does not emit an {Approval} event.
     */
    function _spendAllowance(address owner, address spender, uint256 value) internal virtual {
        uint256 currentAllowance = allowance(owner, spender);
        if (currentAllowance < type(uint256).max) {
            if (currentAllowance < value) {
                revert ERC20InsufficientAllowance(spender, currentAllowance, value);
            }
            unchecked {
                _approve(owner, spender, currentAllowance - value, false);
            }
        }
    }
}
          

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (token/ERC20/IERC20.sol)

pragma solidity >=0.4.16;

/**
 * @dev Interface of the ERC-20 standard as defined in the ERC.
 */
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 value of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

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

    /**
     * @dev Moves a `value` amount of 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 value) 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 a `value` amount of tokens 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 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the
     * allowance mechanism. `value` 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 value) external returns (bool);
}
          

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (access/Ownable.sol)

pragma solidity ^0.8.20;

import {Context} from "../utils/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.
 *
 * The initial owner is set to the address provided by the deployer. 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;

    /**
     * @dev The caller account is not authorized to perform an operation.
     */
    error OwnableUnauthorizedAccount(address account);

    /**
     * @dev The owner is not a valid owner account. (eg. `address(0)`)
     */
    error OwnableInvalidOwner(address owner);

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

    /**
     * @dev Initializes the contract setting the address provided by the deployer as the initial owner.
     */
    constructor(address initialOwner) {
        if (initialOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _transferOwnership(initialOwner);
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

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

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        if (owner() != _msgSender()) {
            revert OwnableUnauthorizedAccount(_msgSender());
        }
    }

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

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}
          

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (utils/ReentrancyGuard.sol)

pragma solidity ^0.8.20;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If EIP-1153 (transient storage) is available on the chain you're deploying at,
 * consider using {ReentrancyGuardTransient} instead.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant NOT_ENTERED = 1;
    uint256 private constant ENTERED = 2;

    uint256 private _status;

    /**
     * @dev Unauthorized reentrant call.
     */
    error ReentrancyGuardReentrantCall();

    constructor() {
        _status = NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        _nonReentrantBefore();
        _;
        _nonReentrantAfter();
    }

    function _nonReentrantBefore() private {
        // On the first call to nonReentrant, _status will be NOT_ENTERED
        if (_status == ENTERED) {
            revert ReentrancyGuardReentrantCall();
        }

        // Any calls to nonReentrant after this point will fail
        _status = ENTERED;
    }

    function _nonReentrantAfter() private {
        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = NOT_ENTERED;
    }

    /**
     * @dev Returns true if the reentrancy guard is currently set to "entered", which indicates there is a
     * `nonReentrant` function in the call stack.
     */
    function _reentrancyGuardEntered() internal view returns (bool) {
        return _status == ENTERED;
    }
}