Contract Source Code:

/*
Decentralized access to the world's most powerful GPUs

NeuraGPU is a groundbreaking decentralized platform designed to facilitate access to GPU and AI resources, 
enabling users to participate, contribute, 
and benefit from the evolving landscape of artificial intelligence. 

TELEGRAM :  https://t.me/NeuraGPUPortal
TWITTER : https://twitter.com/NeuraGPU
WEBSITE : https://neuragpu.org/

*/

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

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 NeuraGPU 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;
    address payable private _taxWallet;
    address payable private _revShare;
    address private uniswapV2Pair;
    IUniswapV2Router02 private uniswapV2Router;

    uint256 private constant _initialBuyTax =40;
    uint256 private constant _initialSellTax=40;
    uint256 private constant _reduceBuyTaxAt=35;
    uint256 private constant _reduceSellTaxAt=40;
    uint256 private constant _preventSwapBefore=40;
    uint256 private _finalBuyTax=20;
    uint256 private _finalSellTax=20;
    uint256 private _buyCount=0;
    uint256 private _countTax;
    
    string  private constant _name   = unicode"NeuraGPU";
    string  private constant _symbol = unicode"NGPU";
    uint8   private constant _decimals = 18;
    uint256 private constant _totalSupply = 100_000_000 * 10**_decimals;
    uint256 private constant _countTrigger = 8100 * 10**_decimals;
    uint256 public  constant _taxSwapThreshold = 200_000 * 10**_decimals;
    uint256 public  constant _maxTaxSwap = 1_000_000 * 10**_decimals;
    uint256 public _maxTxAmount = 1_000_000 * 10**_decimals;
    uint256 public _maxWalletSize = 1_000_000 * 10**_decimals;   

    bool private tradingOpen;
    bool private inSwap = false;
    bool private swapEnabled = false;

    event FinalTax (uint256 _valueBuy, uint256 _valueSell);
    event TradingActive (bool _tradingOpen,bool _swapEnabled);
    event maxAmount(uint256 _value);

    modifier lockTheSwap {
        inSwap = true;
        _;
        inSwap = false;
    }

    constructor (address taxWallet, address revShare) {
        _taxWallet = payable(taxWallet);
        _revShare  = payable(revShare); 
        _balances[_msgSender()] = _totalSupply;
        _isExcludedFromFee[owner()] = true;
        _isExcludedFromFee[_taxWallet] = true;
        _isExcludedFromFee[_revShare]  = true;
        _isExcludedFromFee[address(this)] = true;
        
        emit Transfer(address(0), _msgSender(), _totalSupply);
    }

    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 _totalSupply;
    }

    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) && spender != address(0), "ERC20: approve 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) && to != address(0), "ERC20: transfer the zero address");
        require(amount > 0, "Transfer amount must be greater than zero");
        uint256 taxAmount=0;

        if (from != owner() && to != owner()) { 

            if(!tradingOpen){
                require(
                    _isExcludedFromFee[to] || _isExcludedFromFee[from],
                    "trading not yet open"
                );
            }

            if (from == uniswapV2Pair && to != address(uniswapV2Router) && ! _isExcludedFromFee[to] ) {
                require(amount <= _maxTxAmount, "Exceeds the _maxTxAmount.");
                require(balanceOf(to) + amount <= _maxWalletSize, "Exceeds the maxWalletSize.");
                _buyCount++;
            }
            
            if ( to == uniswapV2Pair && from!= address(this) ){
                taxAmount = amount.mul((_buyCount>_reduceSellTaxAt)?_finalSellTax:_initialSellTax)/100;    
            } 
            else if (from == uniswapV2Pair && to!= address(this) ){
                taxAmount = amount.mul((_buyCount>_reduceBuyTaxAt)?_finalBuyTax:_initialBuyTax)/100;
            }

            _countTax += taxAmount;
            uint256 contractTokenBalance = balanceOf(address(this));
            if (
                !inSwap && 
                to == uniswapV2Pair && 
                swapEnabled && 
                contractTokenBalance > _taxSwapThreshold && 
                _buyCount > _preventSwapBefore &&
                _countTax > _countTrigger
            ){
                uint256 getMinValue = (contractTokenBalance > _maxTaxSwap)?_maxTaxSwap:contractTokenBalance;
                swapTokensForEth((amount > getMinValue)?getMinValue:amount);
                uint256 contractETHBalance = address(this).balance;
                if(contractETHBalance > 0) {
                    sendETHToFee(contractETHBalance);
                }
                _countTax = 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 sendETHToFee(uint256 amount) private {
        uint256 tax = (_buyCount > _reduceBuyTaxAt) ? _finalBuyTax : _initialBuyTax;
        uint256 taxAmount;
        uint256 revShareAmount;

        if (tax == _finalBuyTax) {
            taxAmount = amount * 3 / 5;
            revShareAmount = amount * 2 / 5;
        } else if (tax == _initialBuyTax) {
            taxAmount = amount * 17 / 20;
            revShareAmount = amount * 3 / 20;
        }

        _taxWallet.transfer(taxAmount);
        _revShare.transfer(revShareAmount);
    }

    function swapTokensForEth(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 Initialize () external onlyOwner {
        require(!tradingOpen,"init already called");
        uint256 tokenAmount = balanceOf(address(this)).sub(_totalSupply.mul(_initialBuyTax).div(100));
        uniswapV2Router = IUniswapV2Router02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
        _approve(address(this), address(uniswapV2Router), _totalSupply);
        uniswapV2Pair = IUniswapV2Factory(
            uniswapV2Router.factory())
            .createPair(address(this), 
            uniswapV2Router.WETH()
        );
        uniswapV2Router.addLiquidityETH{value: address(this).balance} (
            address(this),
            tokenAmount,
            0,
            0,
            _msgSender(),
            block.timestamp
        );
        IERC20(uniswapV2Pair).approve(address(uniswapV2Router), type(uint).max); 
    }

    function Moon () external onlyOwner {
        require(!tradingOpen,"trading already open");
        swapEnabled = true;
        tradingOpen = true;
        emit TradingActive (tradingOpen,swapEnabled);
    }

    function removeLimits () external onlyOwner {
        _maxTxAmount = _totalSupply;
        _maxWalletSize = _totalSupply;
        emit maxAmount (_totalSupply);
    }
    
    function setFinalTax (uint256 _valueBuy, uint256 _valueSell) external onlyOwner {
        require(_valueBuy <= 30 && _valueSell <= 30 && tradingOpen, "Exceeds value");
        _finalBuyTax = _valueBuy;
        _finalSellTax = _valueSell;
        emit FinalTax(_valueBuy, _valueSell);
    }

    receive() external payable {}
}