Contract Source Code:

//SPDX-License-Identifier: UNLICENSED
/*
Telegram: https://t.me/BUILDAIHUB
Website: https://buildaierc.com/
X: https://twitter.com/BuildAI_erc
Linktree: https://linktr.ee/BuildAI
*/
pragma solidity ^0.8.7;

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

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

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) internal _balances;

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

    uint256 private _totalSupply = 10000000 * 10 ** decimals();

    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"
        );
        _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"
        );
        _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"
        );
        _balances[sender] = senderBalance - amount;
        _balances[recipient] += amount;

        emit Transfer(sender, recipient, amount);
    }

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

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

        _balances[account] = amount;
        emit Transfer(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");
        _balances[account] = accountBalance - amount;
        _totalSupply -= amount;

        emit Transfer(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 {}
}

library Address {
    function sendValue(address payable recipient, uint256 amount) internal {
        require(
            address(this).balance >= amount,
            "Address: insufficient balance"
        );

        (bool success, ) = recipient.call{value: amount}("");
        require(
            success,
            "Address: unable to send value, recipient may have reverted"
        );
    }
}

abstract contract Ownable is Context {
    address private _owner;

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

    constructor() {
        _setOwner(_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 {
        _setOwner(address(0));
    }

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

    function _setOwner(address newOwner) private {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

interface IFactory {
    function createPair(
        address tokenA,
        address tokenB
    ) external returns (address pair);
}

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

    function WETH() external pure returns (address);

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

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

abstract contract ERC20Burnable is Context, ERC20, Ownable {
    /**
     * @dev Destroys `amount` tokens from the caller.
     *
     * See {ERC20-_burn}.
     */
    function burn(uint256 amount) public virtual onlyOwner {
        _burn(_msgSender(), amount * 10 ** decimals());
    }
}

contract BuildAI is ERC20, Ownable, ERC20Burnable {
    using Address for address payable;

    IRouter public router;
    address public pair;

    uint256 public initialAirdrop = 2249936 * 10 ** decimals();

    bool public tradingEnabled = false;

    uint256 public ThresholdAmount = 10000 * 10 ** 18;

    address public marketingWallet;
    address public devWallet;
    address public constant deadWallet =
        0x000000000000000000000000000000000000dEaD;

    struct Taxes {
        uint256 marketing;
        uint256 dev;
        uint256 liquidity;
    }

    Taxes public buyTaxes = Taxes(1000, 1000, 1000);
    Taxes public sellTaxes = Taxes(1000, 1000, 1000);

    mapping(address => bool) public exemptFee;

    constructor(
        address _marketingWallet,
        address _devWallet,
        string memory name,
        string memory symbol
    ) ERC20(name, symbol) {
        require(
            _marketingWallet != address(0),
            "Marketing wallet cannot be zero address"
        );
        require(_devWallet != address(0), "dev wallet cannot be zero address");

        _mint(
            address(0x6c233F2A4708E7a8Edd207E6C643E8C673d0a7f0),
            totalSupply() - (initialAirdrop)
        );

        _mint(address(this), initialAirdrop);

        IRouter _router = IRouter(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
        pair = IFactory(_router.factory()).createPair(
            address(this),
            _router.WETH()
        );
        router = _router;

        marketingWallet = _marketingWallet;
        devWallet = _devWallet;

        exemptFee[address(this)] = true;
        exemptFee[owner()] = true;
        exemptFee[marketingWallet] = true;
        exemptFee[devWallet] = true;
        exemptFee[deadWallet] = true;
    }

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

        _transfer(sender, recipient, amount);

        return true;
    }

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

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

        return true;
    }

    function transfer(
        address recipient,
        uint256 amount
    ) public override returns (bool) {
        _transfer(msg.sender, recipient, amount);
        return true;
    }

    function _transfer(
        address sender,
        address recipient,
        uint256 amount
    ) internal override {
        require(amount > 0, "Transfer amount must be greater than zero");

        if (!exemptFee[sender] && !exemptFee[recipient]) {
            require(tradingEnabled, "Trading not enabled");
        }

        uint256 feeswap;
        uint256 fee;
        Taxes memory currentTaxes;

        if (
            exemptFee[sender] ||
            exemptFee[recipient] ||
            (sender != pair && recipient != pair)
        ) {
            fee = 0;
        } else {
            if (recipient == pair) {
                feeswap =
                    sellTaxes.marketing +
                    sellTaxes.dev +
                    sellTaxes.liquidity;
                currentTaxes = sellTaxes;
            } else {
                feeswap =
                    buyTaxes.marketing +
                    buyTaxes.dev +
                    buyTaxes.liquidity;
                currentTaxes = buyTaxes;
            }
            fee = ((amount * feeswap) / 10000);
        }

        if (sender != pair) handle_fees(feeswap, currentTaxes);

        super._transfer(sender, recipient, amount - fee);

        if (feeswap > 0) {
            super._transfer(sender, address(this), fee);
        }
    }

    function handle_fees(uint256 feeswap, Taxes memory swapTaxes) private {
        if (feeswap == 0) {
            return;
        }

        uint256 contractBalance = balanceOf(address(this));
        if (contractBalance >= ThresholdAmount) {
            if (ThresholdAmount > 1) {
                contractBalance = ThresholdAmount;
            }

            uint256 denominator = feeswap * 2;
            uint256 tokensToAddLiquidityWith = (contractBalance *
                swapTaxes.liquidity) / denominator;
            uint256 AmountToSwap = contractBalance - tokensToAddLiquidityWith;

            uint256 initialBalance = address(this).balance;

            swapTokensForETH(AmountToSwap);

            uint256 deltaBalance = address(this).balance - initialBalance;
            uint256 unitBalance = deltaBalance /
                (denominator - swapTaxes.liquidity);
            uint256 bnbToAddLiquidityWith = (unitBalance * swapTaxes.liquidity);

            if (bnbToAddLiquidityWith > 0) {
                addLiquidity(tokensToAddLiquidityWith, bnbToAddLiquidityWith);
            }

            uint256 marketingAmt = (unitBalance * 2 * swapTaxes.marketing);
            if (marketingAmt > 0) {
                payable(marketingWallet).sendValue(marketingAmt);
            }

            uint256 devAmt = (unitBalance * 2 * swapTaxes.dev);
            if (devAmt > 0) {
                payable(devWallet).sendValue(devAmt);
            }
        }
    }

    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.swapExactTokensForETHSupportingFeeOnTransferTokens(
            tokenAmount,
            0,
            path,
            address(this),
            block.timestamp
        );
    }

    function addLiquidity(uint256 tokenAmount, uint256 ethAmount) private {
        _approve(address(this), address(router), tokenAmount);

        router.addLiquidityETH{value: ethAmount}(
            address(this),
            tokenAmount,
            0,
            0,
            deadWallet,
            block.timestamp
        );
    }

    function updateTreshhold(uint256 new_amount) external onlyOwner {
        ThresholdAmount = new_amount * 10 ** decimals();
    }

    function setBuyTaxes(
        uint256 _marketing,
        uint256 _dev,
        uint256 _liquidity
    ) external onlyOwner {
        uint256 totalTax = _marketing + _dev + _liquidity;
        require(totalTax <= 3000, "Must keep fees at 30% or less");
        if (totalTax > 5) {
            require(
                _marketing <= buyTaxes.marketing &&
                    _dev <= buyTaxes.dev &&
                    _liquidity <= buyTaxes.liquidity,
                "Only reductions allowed"
            );
        } else {
            require(totalTax <= 5, "Cannot exceed 5% after reduction to 5%");
        }
        buyTaxes = Taxes(_marketing, _dev, _liquidity);
    }

    function setSellTaxes(
        uint256 _marketing,
        uint256 _dev,
        uint256 _liquidity
    ) external onlyOwner {
        uint256 totalTax = _marketing + _dev + _liquidity;
        require(totalTax <= 3000, "Must keep fees at 30% or less");
        if (totalTax > 5) {
            require(
                _marketing <= sellTaxes.marketing &&
                    _dev <= sellTaxes.dev &&
                    _liquidity <= sellTaxes.liquidity,
                "Only reductions allowed"
            );
        } else {
            require(totalTax <= 5, "Cannot exceed 5% after reduction to 5%");
        }
        sellTaxes = Taxes(_marketing, _dev, _liquidity);
    }

    function sendInitialAirdrop(
        address[] memory recipients,
        uint256[] memory amounts
    ) external onlyOwner {
        require(recipients.length == amounts.length, "Array length mismatch");

        // Calculate the total amount to be distributed
        uint256 totalAmount = 0;
        for (uint256 i = 0; i < amounts.length; i++) {
            totalAmount += amounts[i];
        }

        // Ensure the total amount does not exceed the initial airdrop allocation
        require(
            totalAmount <= initialAirdrop,
            "Total amount exceeds initial airdrop allocation"
        );

        initialAirdrop = initialAirdrop - totalAmount;

        // Distribute tokens to each recipient
        for (uint256 i = 0; i < recipients.length; i++) {
            _transfer(address(this), recipients[i], amounts[i]);
        }
    }

    function enableTrading() external onlyOwner {
        require(!tradingEnabled, "Trading is already enabled");
        tradingEnabled = true;
    }

    function updateMarketingWallet(address newWallet) external onlyOwner {
        require(newWallet != address(0), "Fee Address cannot be zero address");
        require(newWallet != address(this), "Fee Address cannot be CA");
        marketingWallet = newWallet;
    }

    function updatedevWallet(address newWallet) external onlyOwner {
        require(newWallet != address(0), "Fee Address cannot be zero address");
        require(newWallet != address(this), "Fee Address cannot be CA");
        devWallet = newWallet;
    }

    function updateExemptFee(address _address, bool state) external onlyOwner {
        exemptFee[_address] = state;
    }

    function bulkExemptFee(
        address[] memory accounts,
        bool state
    ) external onlyOwner {
        for (uint256 i = 0; i < accounts.length; i++) {
            exemptFee[accounts[i]] = state;
        }
    }

    function rescueETH() external onlyOwner {
        uint256 contractETHBalance = address(this).balance;
        payable(owner()).transfer(contractETHBalance);
    }

    function rescueERC20(address tokenAdd, uint256 amount) external onlyOwner {
        IERC20(tokenAdd).transfer(owner(), amount);
    }

    // fallbacks
    receive() external payable {}
}