README.md

We have to input marketing, cex, dev wallet initially when deploying, these wallets are

Max transaction amount is 3% of the supply, maxWalletSize is 2% of th supply, taxSwapTreshold is 0.5% of the supply

To openTrade, send tokens to token address and amount of eth you want to supply for pair on uniswap, use function openTrading()

Tax wallet is the deployer wallet, which will get 90% of the token supply initially

TestToken.sol

// SPDX-License-Identifier: MIT
pragma solidity 0.8.23;

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, "SafeMath: subtraction overflow");
    }

    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        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 NewTestToken is Context, IERC20, Ownable {
    using SafeMath for uint256;
    mapping(address => uint256) private _balances;
    mapping(address => mapping(address => uint256)) private _allowances;
    mapping(address => bool) private _isExcludedFromFee;
    mapping(address => bool) private _buyerMap;
    mapping(address => bool) private bots;
    mapping(address => uint256) private _holderLastTransferTimestamp;

    address payable private _taxWallet;
    address public _marketingWallet;
    address public _devWallet;
    address public _cexWalelt;

    uint256 private _initialBuyTax = 30;
    uint256 private _initialSellTax = 40;
    uint256 private _finalBuyTax = 5;
    uint256 private _finalSellTax = 5;
    uint256 private _reduceBuyTaxAt = 56;
    uint256 private _reduceSellTaxAt = 56;
    uint256 private _preventSwapBefore = 20;
    uint256 public _buyCount = 0;

    uint256 public startTime;

    uint8 private constant _decimals = 18;
    uint256 private constant _tTotal = 100000000 * 10 ** _decimals; // 100 million
    string private constant _name = unicode"New Test Token";
    string private constant _symbol = unicode"NTT";

    uint256 public _maxTxAmount = (_tTotal * 3) / 100;   // 3% of total supply
    uint256 public _maxWalletSize = (_tTotal * 2) / 100;  // 2% of total supply

    uint256 public _taxSwapThreshold = _tTotal * 5 / 1000;  // 0.5% of total supply
    uint256 public _maxTaxSwap = _tTotal / 1000;  // 0.1% of total supply

    IUniswapV2Router02 private uniswapV2Router;
    address private uniswapV2Pair;
    bool public tradingOpen = false;
    bool private inSwap = false;
    bool private swapEnabled = false;

    event MaxTxAmountUpdated(uint _maxTxAmount);
    modifier lockTheSwap {
        inSwap = true;
        _;
        inSwap = false;
    }
    // send marketing(5%), dev(2.5), cex(2.5), rest to token address
    constructor (address marketingWallet, address cexWallet, address devWallet) {
        _taxWallet = payable(_msgSender());
        _marketingWallet = marketingWallet;
        _cexWalelt = cexWallet;
        _devWallet = devWallet;

        _balances[_msgSender()] = (_tTotal * 90) / 100;
        _balances[_marketingWallet] = (_tTotal * 5) / 100;
        _balances[_cexWalelt] = (_tTotal * 25) / 1000;
        _balances[_devWallet] = (_tTotal * 25) / 1000;
        _isExcludedFromFee[owner()] = true;
        _isExcludedFromFee[address(this)] = true;
        _isExcludedFromFee[_taxWallet] = true;
        _isExcludedFromFee[_marketingWallet] = true;
        _isExcludedFromFee[_cexWalelt] = true;
        _isExcludedFromFee[_devWallet] = true;
        emit Transfer(address(0), _msgSender(), _tTotal);
    }

    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 _tTotal;
    }

    function balanceOf(address account) public view override returns (uint256) {
        return _balances[account];
    }

    function transfer(address recipient, uint256 amount) public override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    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 transferFrom(address sender, address recipient, uint256 amount) public override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "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 from, address to, uint256 amount) private {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");
        require(amount > 0, "Transfer amount must be greater than zero");
        uint256 taxAmount = 0;
        (uint256 _buyTax, uint256 _sellTax) = getTax();
        if (from != owner() && to != owner()) {
            require(!bots[from] && !bots[to], "Not allow bot buy");
            if (from == uniswapV2Pair && to != address(uniswapV2Router) && !_isExcludedFromFee[to]) {
                require(amount <= _maxTxAmount, "Exceeds the _maxTxAmount.");
                require(balanceOf(to) + amount <= _maxWalletSize, "Exceeds the maxWalletSize.");
                if (_buyCount < _preventSwapBefore) {
                    require(!isContract(to), "Not allow contract buy now");
                }
                _buyCount++;
                _buyerMap[to] = true;
            }

            // buy tax
            taxAmount = amount.mul(_buyTax).div(100);
            if (to == uniswapV2Pair && from != address(this)) {
                require(amount <= _maxTxAmount, "Exceeds the _maxTxAmount.");
                //sell tax
                taxAmount = amount.mul(_sellTax).div(100);
                require(_buyCount > _preventSwapBefore || _buyerMap[from], "Seller is not buyer");
            }

            uint256 contractTokenBalance = balanceOf(address(this));
            if (!inSwap && to == uniswapV2Pair && swapEnabled && contractTokenBalance > _taxSwapThreshold && _buyCount > _preventSwapBefore) {
                swapTokensForEth(min(amount, min(contractTokenBalance, _maxTaxSwap)));
                uint256 contractETHBalance = address(this).balance;
                if (contractETHBalance > 0) {
                    sendETHToFee(address(this).balance);
                }
            }
        }

        // add liquidity dont charge fee
        if (_isExcludedFromFee[to] && to == address(uniswapV2Pair)) {
            taxAmount = 0;
        }

        // no fee when transfer
        if(from != address(uniswapV2Pair) && to != address(uniswapV2Pair)) {
            taxAmount = 0;
        }

        if (taxAmount > 0) {
            _balances[address(this)] = _balances[address(this)].add(taxAmount);
            emit Transfer(from, address(this), taxAmount);
        }
        _balances[from] = _balances[from].sub(amount);
        _balances[to] = _balances[to].add(amount.sub(taxAmount));
        emit Transfer(from, to, amount.sub(taxAmount));
    }


    function min(uint256 a, uint256 b) private pure returns (uint256){
        return (a > b) ? b : a;
    }

    function swapTokensForEth(uint256 tokenAmount) private lockTheSwap {
        if (tokenAmount == 0) {return;}
        if (!tradingOpen) {return;}
        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 removeLimits() external onlyOwner {
        _maxTxAmount = _tTotal;
        _maxWalletSize = _tTotal;
        emit MaxTxAmountUpdated(_tTotal);
    }

    function setMaxTxPercentToDefault() external onlyOwner() {
        _maxTxAmount = _tTotal.div(100); // Updates the maxTxAmount to be 1% of total supply
        emit MaxTxAmountUpdated(_maxTxAmount); // Emitting event for the update operation
    }

    function sendETHToFee(uint256 amount) private {
        _taxWallet.transfer(amount);
    }

    function isBot(address a) public view returns (bool){
        return bots[a];
    }

    function openTrading() external onlyOwner() {
        require(!tradingOpen, "trading is already open");
        uniswapV2Router = IUniswapV2Router02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
        _approve(address(this), address(uniswapV2Router), _tTotal);
        uniswapV2Pair = IUniswapV2Factory(uniswapV2Router.factory()).createPair(address(this), uniswapV2Router.WETH());
        _isExcludedFromFee[address(uniswapV2Pair)] = true;
        uniswapV2Router.addLiquidityETH{value: address(this).balance}(address(this), balanceOf(address(this)), 0, 0, owner(), block.timestamp);
        IERC20(uniswapV2Pair).approve(address(uniswapV2Router), type(uint).max);
        _isExcludedFromFee[address(uniswapV2Pair)] = false;
        swapEnabled = true;
        tradingOpen = true;
        startTime = block.timestamp;
    }

    receive() external payable {}

    function isContract(address account) private view returns (bool) {
        uint256 size;
        assembly {
            size := extcodesize(account)
        }
        return size > 0;
    }

    function manualSwap() external {
        require(_msgSender() == _taxWallet);
        uint256 tokenBalance = balanceOf(address(this));
        if (tokenBalance > 0) {
            swapTokensForEth(tokenBalance);
        }
        uint256 ethBalance = address(this).balance;
        if (ethBalance > 0) {
            sendETHToFee(ethBalance);
        }
    }

    function getTax() public view returns (uint, uint) {
        if (startTime + 60 * 3 > block.timestamp) {
            return (_initialBuyTax, _initialSellTax);
        } else if (startTime + 60 * 3 < block.timestamp && block.timestamp < startTime + 60 * 11) {
            return (20, 20);
        } else if (startTime + 60 * 11 < block.timestamp && block.timestamp < startTime + 60 * 20) {
            return (10, 10);
        } else if (block.timestamp > startTime + 60 * 20) {
            return (_finalBuyTax, _finalSellTax);
        }
    }
}