Cryo Explorer Ethereum Mainnet

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.21;

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

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

abstract contract Ownable is Context {
    address private _owner;

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


    constructor() {
        _transferOwnership(_msgSender());
    }


    function owner() public view virtual returns (address) {
        return _owner;
    }


    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }


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

    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

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);
}

interface IERC20Metadata is IERC20 {

    function name() external view returns (string memory);

    function symbol() external view returns (string memory);

    function decimals() external view returns (uint8);
}

contract ERC20 is Context, IERC20, IERC20Metadata {
    mapping(address => uint256) private _balances;

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

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }


    function name() public view virtual override returns (string memory) {
        return _name;
    }

    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    function decimals() public view virtual override returns (uint8) {
        return 18;
    }

    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }

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

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

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

    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);

        uint256 currentAllowance = _allowances[sender][_msgSender()];
        require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance");
        unchecked {
            _approve(sender, _msgSender(), currentAllowance - amount);
        }

        return true;
    }

    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender] + addedValue);
        return true;
    }

    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        uint256 currentAllowance = _allowances[_msgSender()][spender];
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(_msgSender(), spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    function _transfer(
        address sender,
        address recipient,
        uint256 amount
    ) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(sender, recipient, amount);

        uint256 senderBalance = _balances[sender];
        require(senderBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[sender] = senderBalance - amount;
        }
        _balances[recipient] += amount;

        emit Transfer(sender, recipient, amount);

        _afterTokenTransfer(sender, recipient, amount);
    }

    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply += amount;
        _balances[account] += amount;
        emit Transfer(address(0), account, amount);

        _afterTokenTransfer(address(0), account, amount);
    }

    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
        }
        _totalSupply -= amount;

        emit Transfer(account, address(0), amount);

        _afterTokenTransfer(account, address(0), amount);
    }

    function _approve(
        address owner,
        address spender,
        uint256 amount
    ) internal virtual {
        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 _beforeTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}

    function _afterTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}
}

library SafeMath {

    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            uint256 c = a + b;
            if (c < a) return (false, 0);
            return (true, c);
        }
    }

    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b > a) return (false, 0);
            return (true, a - b);
        }
    }

    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (a == 0) return (true, 0);
            uint256 c = a * b;
            if (c / a != b) return (false, 0);
            return (true, c);
        }
    }

    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a / b);
        }
    }

    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a % b);
        }
    }

    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        return a + b;
    }

    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return a - b;
    }

    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        return a * b;
    }

    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return a / b;
    }

    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return a % b;
    }

    function sub(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b <= a, errorMessage);
            return a - b;
        }
    }

    function div(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a / b;
        }
    }

    function mod(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a % b;
        }
    }
}

interface IUniswapV2Factory {
    event PairCreated(
        address indexed token0,
        address indexed token1,
        address pair,
        uint256
    );

    function feeTo() external view returns (address);

    function feeToSetter() external view returns (address);

    function getPair(address tokenA, address tokenB)
        external
        view
        returns (address pair);

    function allPairs(uint256) external view returns (address pair);

    function allPairsLength() external view returns (uint256);

    function createPair(address tokenA, address tokenB)
        external
        returns (address pair);

    function setFeeTo(address) external;

    function setFeeToSetter(address) external;
}

interface IUniswapV2Pair {
    event Approval(
        address indexed owner,
        address indexed spender,
        uint256 value
    );
    event Transfer(address indexed from, address indexed to, uint256 value);

    function name() external pure returns (string memory);

    function symbol() external pure returns (string memory);

    function decimals() external pure returns (uint8);

    function totalSupply() external view returns (uint256);

    function balanceOf(address owner) external view returns (uint256);

    function allowance(address owner, address spender)
        external
        view
        returns (uint256);

    function approve(address spender, uint256 value) external returns (bool);

    function transfer(address to, uint256 value) external returns (bool);

    function transferFrom(
        address from,
        address to,
        uint256 value
    ) external returns (bool);

    function DOMAIN_SEPARATOR() external view returns (bytes32);

    function PERMIT_TYPEHASH() external pure returns (bytes32);

    function nonces(address owner) external view returns (uint256);

    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    event Mint(address indexed sender, uint256 amount0, uint256 amount1);
    event Burn(
        address indexed sender,
        uint256 amount0,
        uint256 amount1,
        address indexed to
    );
    event Swap(
        address indexed sender,
        uint256 amount0In,
        uint256 amount1In,
        uint256 amount0Out,
        uint256 amount1Out,
        address indexed to
    );
    event Sync(uint112 reserve0, uint112 reserve1);

    function MINIMUM_LIQUIDITY() external pure returns (uint256);

    function factory() external view returns (address);

    function token0() external view returns (address);

    function token1() external view returns (address);

    function getReserves()
        external
        view
        returns (
            uint112 reserve0,
            uint112 reserve1,
            uint32 blockTimestampLast
        );

    function price0CumulativeLast() external view returns (uint256);

    function price1CumulativeLast() external view returns (uint256);

    function kLast() external view returns (uint256);

    function mint(address to) external returns (uint256 liquidity);

    function burn(address to)
        external
        returns (uint256 amount0, uint256 amount1);

    function swap(
        uint256 amount0Out,
        uint256 amount1Out,
        address to,
        bytes calldata data
    ) external;

    function skim(address to) external;

    function sync() external;

    function initialize(address, address) external;
}

interface IUniswapV2Router02 {
    function factory() external pure returns (address);

    function WETH() external pure returns (address);

    function addLiquidity(
        address tokenA,
        address tokenB,
        uint256 amountADesired,
        uint256 amountBDesired,
        uint256 amountAMin,
        uint256 amountBMin,
        address to,
        uint256 deadline
    )
        external
        returns (
            uint256 amountA,
            uint256 amountB,
            uint256 liquidity
        );

    function addLiquidityETH(
        address token,
        uint256 amountTokenDesired,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline
    )
        external
        payable
        returns (
            uint256 amountToken,
            uint256 amountETH,
            uint256 liquidity
        );

    function swapExactTokensForTokensSupportingFeeOnTransferTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external;

    function swapExactETHForTokensSupportingFeeOnTransferTokens(
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external payable;

    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external;
}

contract QubeSmart is ERC20, Ownable {
    using SafeMath for uint256;

    // --- Configuration Structs ---

    /**
     * @dev Holds the fee percentages for buy and sell transactions.
     */
    struct FeeConfiguration {
        uint256 buyFeePercent;
        uint256 sellFeePercent;
    }

    /**
     * @dev Holds settings related to the automated token swap mechanism.
     * @swapThreshold the minimum number of tokens the contract must hold to trigger a swap.
     * @maxSwapAmount the maximum number of tokens to swap in a single transaction.
     */
    struct SwapConfiguration {
        uint256 swapThreshold;
        uint256 maxSwapAmount;    
        bool isSwapEnabled;
    }

    /**
     * @dev Stores the addresses for distributing collected fees.
     */
    struct FeeRecipientWallets {
        address marketingWallet;
    }

    // --- State Variables ---

    IUniswapV2Router02 public immutable uniswapV2Router;
    address public immutable uniswapV2Pair;

    FeeConfiguration public taxSettings;
    SwapConfiguration public swapSettings;
    FeeRecipientWallets public feeWallets;

    mapping(address => bool) public automatedMarketMakerPairs;
    mapping(address => bool) private _isFeeExempt;
    mapping(address => bool) private _isBlacklisted;

    bool private _isTradingLive;
    bool private _inSwap; // Re-entrancy guard to prevent multiple swaps at the same time.

    // fee calculations in basis points (100%)
    uint256 private constant FEE_BASIS_POINTS = 100;

    // --- Events ---

    event FeesUpdated(uint256 buyFee, uint256 sellFee);
    event WalletsUpdated(address marketingWallet);
    event ExcludeFromFees(address indexed account, bool isExcluded);
    event SwapAndDistribute(uint256 tokensSwapped, uint256 ethReceived);

    // --- Modifiers ---

    /**
     * @dev Prevents re-entrancy for the swap mechanism.
     */
    modifier lockTheSwap() {
        _inSwap = true;
        _;
        _inSwap = false;
    }

    // --- Constructor ---

    constructor(address newOwner)  ERC20("QubeSmart", "CS") {
        require(newOwner != address(0), "Owner wallet cannot be zero address");
        // Uniswap Router - Mainnet address
        IUniswapV2Router02 _router = IUniswapV2Router02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
        uniswapV2Router = _router;

        // Create the trading pair for this token and WETH
        uniswapV2Pair = IUniswapV2Factory(_router.factory()).createPair(address(this), _router.WETH());
        automatedMarketMakerPairs[uniswapV2Pair] = true;

        // --- Configurations ---
        uint256 totalSupply = 1_00_000_000 * 1e18;

        // Initial swap settings: swap at 0.01% of total supply, max swap is 1%
        swapSettings = SwapConfiguration({
            swapThreshold: totalSupply / 10000,
            maxSwapAmount: totalSupply / 100,
            isSwapEnabled: false // Trading starts disabled
        });

        /**
        * Initial tax settings
        * 0% buy, 4% sell
        */
        taxSettings = FeeConfiguration({
            buyFeePercent: 0,
            sellFeePercent: 4
        });

        // Initialize fee recipient wallets
        feeWallets = FeeRecipientWallets({
            marketingWallet: 0x29aCa368a5F4424Cf44739D7B4e25E17795872a3
        });

        // Mint the total supply
        // _mint(owner(), totalSupply);
        _mint(newOwner, totalSupply);
        _transferOwnership(newOwner);

        // --- Exclude Core Addresses From Fees ---
        _setFeeExemption(owner(), true);
        _setFeeExemption(address(this), true);
        _setFeeExemption(address(0xdead), true);
        _setFeeExemption(feeWallets.marketingWallet, true);
    }

    // Receive ETH from the router when swapping.
    receive() external payable {}

    // --- Core Logic ---

    /**
     * @dev Overrides the internal _transfer function to implement custom tax and swap logic.
     */
    function _transfer(
        address from,
        address to,
        uint256 amount
    ) internal override {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");
        require(!_isBlacklisted[from] && !_isBlacklisted[to], "BV: Address is blacklisted.");

        if (amount == 0) {
            super._transfer(from, to, 0);
            return;
        }

        // Enforce trading status
        if (!_isTradingLive) {
            require(_isFeeExempt[from] || _isFeeExempt[to], "BV: Trading is not yet enabled.");
        }
        
        // If we are already in a swap, perform a standard transfer to avoid loops.
        if (_inSwap) {
            super._transfer(from, to, amount);
            return;
        }

        /*
        * Check if conditions are met to trigger an automatic token swap.
        * This is done on transfers and sells, but not on buys (where `from` is a pair).
        */ 
        uint256 contractTokenBalance = balanceOf(address(this));
        bool canSwap = contractTokenBalance >= swapSettings.swapThreshold;
        
        if (
            canSwap &&
            swapSettings.isSwapEnabled &&
            !automatedMarketMakerPairs[from] &&
            !_isFeeExempt[from] &&
            !_isFeeExempt[to]
        ) {
            _swapAndDistributeETH();
        }
        
        // Apply fees to the transaction
        uint256 fees = _handleFees(from, to, amount);
        uint256 transferAmount = amount.sub(fees);

        // Perform the transfer with the adjusted amount
        super._transfer(from, to, transferAmount);
    }

    /**
     * @dev Calculates and collects fees for buy and sell transactions.
     * @return The amount of tokens taken as fees.
     */
    function _handleFees(address from, address to, uint256 amount) private returns (uint256) {
        if (_isFeeExempt[from] || _isFeeExempt[to]) {
            return 0;
        }

        uint256 feePercent = 0;
        if (automatedMarketMakerPairs[to]) { // Sell transaction
            feePercent = taxSettings.sellFeePercent;
        } else if (automatedMarketMakerPairs[from]) { // Buy transaction
            feePercent = taxSettings.buyFeePercent;
        }

        if (feePercent > 0) {
            uint256 feeAmount = amount.mul(feePercent).div(FEE_BASIS_POINTS);
            if (feeAmount > 0) {
                super._transfer(from, address(this), feeAmount);
            }
            return feeAmount;
        }

        return 0;
    }

    // --- Swap and Distribution Logic ---

    /**
     * @dev Main function to swap collected tokens for ETH and distribute to wallets.
     */
    function _swapAndDistributeETH() private lockTheSwap {
        uint256 contractBalance = balanceOf(address(this));
        if (contractBalance == 0) {
            return;
        }

        uint256 amountToSwap = (contractBalance > swapSettings.maxSwapAmount)
            ? swapSettings.maxSwapAmount
            : contractBalance;

        _swapTokensForETH(amountToSwap);
        
        uint256 ethBalance = address(this).balance;
        if (ethBalance > 0) {
            _distributeETH(ethBalance);
            emit SwapAndDistribute(amountToSwap, ethBalance);
        }
    }

    /**
     * @dev Swaps a specific amount of this contract's tokens for ETH.
     */
    function _swapTokensForETH(uint256 tokenAmount) private {
        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = uniswapV2Router.WETH();

        _approve(address(this), address(uniswapV2Router), tokenAmount);

        uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(
            tokenAmount,
            0, // accept any amount of ETH
            path,
            address(this), // Send ETH to this contract
            block.timestamp
        );
    }

    /**
     * @dev Distributes a given amount of ETH equally between the marketing and dev wallets.
     * for now only dev wallet
     */
    function _distributeETH(uint256 amount) private {
        (bool success, ) = feeWallets.marketingWallet.call{value: amount}("");
        require(success, "BV: Marketing wallet ETH transfer failed");
    }


    // --- Owner Functions ---

    function enableTrading() external onlyOwner {
        _isTradingLive = true;
        swapSettings.isSwapEnabled = true;
    }

    function disableAllFees() external onlyOwner {
        taxSettings.buyFeePercent = 0;
        taxSettings.sellFeePercent = 0;
        emit FeesUpdated(0, 0);
    }

    function updateTaxes(uint256 newBuyFee, uint256 newSellFee) external onlyOwner {
        require(newBuyFee <= 5, "BV: Buy fee cannot exceed 5%");
        require(newSellFee <= 5, "BV: Sell fee cannot exceed 5%");
        taxSettings.buyFeePercent = newBuyFee;
        taxSettings.sellFeePercent = newSellFee;
        emit FeesUpdated(newBuyFee, newSellFee);
    }

    function updateSwapConfiguration(uint256 newThreshold, uint256 newMaxAmount, bool enabled) external onlyOwner {
        swapSettings.swapThreshold = newThreshold;
        swapSettings.maxSwapAmount = newMaxAmount;
        swapSettings.isSwapEnabled = enabled;
    }

    function _setFeeExemption(address account, bool isExempt) internal {
        _isFeeExempt[account] = isExempt;
        emit ExcludeFromFees(account, isExempt);
    }

    function setFeeExemption(address account, bool isExempt) public onlyOwner {
        _setFeeExemption(account, isExempt);
    }

    function manageBlacklist(address[] calldata accounts, bool isBlacklisted) public onlyOwner {
        for (uint256 i = 0; i < accounts.length; i++) {
            _isBlacklisted[accounts[i]] = isBlacklisted;
        }
    }

    function updateFeeWallets(address newMarketingWallet) external onlyOwner {
        require(newMarketingWallet != address(0), "BV: Wallets cannot be zero address");
        feeWallets.marketingWallet = newMarketingWallet;
        emit WalletsUpdated(newMarketingWallet);
    }
    
    function setAutomatedMarketMakerPair(address pair, bool isPair) public onlyOwner {
        require(pair != uniswapV2Pair, "BV: Cannot alter the main pair's status.");
        automatedMarketMakerPairs[pair] = isPair;
    }
    
    // --- Manual & Utility Functions ---

    /**
     * @dev Allows team wallets to manually trigger a token swap.
     */
    function manualSwap(uint256 amount) external lockTheSwap {
        require(_msgSender() == feeWallets.marketingWallet, "BV: Caller is not a team wallet");
        require(amount <= balanceOf(address(this)) && amount > 0, "BV: Invalid amount for swap");
        _swapTokensForETH(amount);
    }

    /**
     * @dev Allows team wallets to manually distribute any ETH held by the contract.
     */
    function manualDistribute() external {
        require(_msgSender() == feeWallets.marketingWallet, "BV: Caller is not a team wallet");
        uint256 ethBalance = address(this).balance;
        require(ethBalance > 0, "BV: No ETH to distribute.");
        _distributeETH(ethBalance);
    }
    
    /**
     * @dev Allows a user to send tokens to multiple addresses in a single transaction.
     */
    function massTransfer(address[] calldata recipients, uint256[] calldata amounts) external {
        require(recipients.length > 0 && recipients.length == amounts.length, "BV: Invalid input arrays");
        for (uint i = 0; i < recipients.length; i++) {
            transfer(recipients[i], amounts[i] * (10**18));
        }
    }
}