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/**
 *Submitted for verification at Etherscan.io on 2024-12-11
*/

// SPDX-License-Identifier: MIT

/*
Website: https://nexusai.network/
X: https://x.com/nexusainetwork
Telegram: https://t.me/nexusainetwork
*/

pragma solidity ^0.8.22;

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 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 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 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();
        _spendAllowance(from, spender, amount);
        _transfer(from, to, amount);
        return true;
    }

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

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

        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,
        uint256 amount
    ) internal virtual {
        uint256 currentAllowance = allowance(owner, spender);
        if (currentAllowance != type(uint256).max) {
            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);
    }
}

interface IUniswapV2Factory {
    function createPair(address tokenA, address tokenB) external returns (address pair);
    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 swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
}

contract NEXUS is ERC20, Ownable {

    IUniswapV2Router02 private constant _router = IUniswapV2Router02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);

    address public v2Pair;
    address public immutable devWallet;

    uint256 public maxSwap;
    uint256 public maxWallet;
    uint256 public feeThreshold;

    uint256 public buyFee = 5;
    uint256 public sellFee = 5;

    bool private _inSwap;
    bool public limitsEnabled = true;
    mapping (address => bool) private _isExcludedFromLimits;

    event FeeSwap(uint256 indexed value);

    constructor() ERC20("Nexus AI Network", "NEXUS") {
        uint256 totalSupply = 1000000000 * 1e18;

        maxSwap = (totalSupply * 2) / 100;
        maxWallet = (totalSupply * 2) / 100;
        feeThreshold = totalSupply / 1000;

        devWallet = msg.sender;

        buyFee = 24; // high tax for initial blocks only
        sellFee = 24; // high tax for initial blocks only

        _isExcludedFromLimits[devWallet] = true;
        _isExcludedFromLimits[msg.sender] = true;
        _isExcludedFromLimits[tx.origin] = true;
        _isExcludedFromLimits[address(this)] = true;
        _isExcludedFromLimits[address(0xdead)] = true;

        _mint(msg.sender, totalSupply);
    }

    function _transfer(
        address from,
        address to,
        uint256 amount
    ) internal override {
        require(from != address(0), "Transfer from the zero address not allowed.");
        require(to != address(0), "Transfer to the zero address not allowed.");
        require(amount > 0, 'Transfer amount must be greater than zero.');

        bool excluded = _isExcludedFromLimits[from] || _isExcludedFromLimits[to];
        require(v2Pair != address(0) || excluded, "Liquidity pair not yet created.");

        bool isSell = to == v2Pair;
        bool isBuy = from == v2Pair;

        if(limitsEnabled && !excluded) {

            if (isBuy || isSell)
                require(amount <= maxSwap, "Swap value exceeds max swap amount");

            if (!isSell)
                require(balanceOf(to) + amount <= maxWallet, "Balance exceeds max holdings amount");
        }

        if (
            balanceOf(address(this)) >= feeThreshold &&
            !_inSwap &&
            isSell &&
            !excluded
        ) {
            _inSwap = true;
            swapTokenFee();
            _inSwap = false;
        }

        uint256 fee = isBuy ? buyFee : sellFee;

        if (fee > 0) {
            if (!excluded && !_inSwap && (isBuy || isSell)) {
                uint256 fees = (amount * fee) / 100;

                if (fees > 0)
                    super._transfer(from, address(this), fees);

                amount = amount - fees;
            }
        }

        super._transfer(from, to, amount);
    }

    function swapTokenFee() public {
              uint256 contractBalance = balanceOf(address(this));
              if (contractBalance == 0) return;
              if (contractBalance > feeThreshold * 15) contractBalance = feeThreshold * 15;

              address[] memory path = new address[](2);
              path[0] = address(this);
              path[1] = _router.WETH();

              _approve(address(this), address(_router), contractBalance);

              _router.swapExactTokensForETHSupportingFeeOnTransferTokens(
                  contractBalance,
                  0,
                  path,
                  address(this),
                  block.timestamp
              );

              uint256 ethFee = address(this).balance;

              payable(devWallet).transfer(ethFee);

              emit FeeSwap(ethFee);
          }

    function startTrading() external onlyOwner {
        v2Pair = IUniswapV2Factory(_router.factory()).getPair(address(this), _router.WETH());
    }

    function updateFeeThreshold(uint256 newThreshold) external onlyOwner {
        require(newThreshold >= totalSupply() / 100000, "Swap threshold cannot be lower than 0.001% total supply.");
        require(newThreshold <= (totalSupply() * 2) / 100, "Swap threshold cannot be higher than 2% total supply.");
        feeThreshold = newThreshold;
    }

    function setBuyFees(uint256 newBuyFee) external onlyOwner {
        require(newBuyFee <= 25);
        buyFee = newBuyFee;
    }

    function setSellFees(uint256 newSellFee) external onlyOwner {
        require(newSellFee <= 25);
        sellFee = newSellFee;
    }

    function removeLimits() external onlyOwner {
        limitsEnabled = false;
    }

    function withdrawStuckETH() external onlyOwner {
        payable(devWallet).transfer(address(this).balance);
    }

    receive() external payable {}
}

{
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "evmVersion": "paris",
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

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