StockChain

/**

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A pioneering stock trading platform using crypto.

Website : https://stockchain.trading/
Platform : https://platform.stockchain.trading/login
Twitter : https://x.com/StockChainTeam
Telegram : https://t.me/StockChainOfficial

**/


// SPDX-License-Identifier: MIT
pragma solidity ^0.8.24;
 
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 StockChain is Context, IERC20, Ownable {
 
    using SafeMath for uint256;
 
    // Declare events
    event MaxTxAmountUpdated(uint _maxBuySize);
    event TransferTaxUpdated(uint _tax);
    event TransferWithFee(address indexed from, address indexed to, uint256 amount, uint256 fee);
    event TaxUpdated(uint256 newBuyTax, uint256 newSellTax, address indexed updatedBy);
    event TradingOpened(address indexed openedBy, uint256 timestamp);
    event LimitsRemoved(address indexed removedBy);
    event MaxTransactionSizeUpdated(address indexed updatedBy, uint256 newMaxSize);
    event TaxThresholdUpdated(address indexed updatedBy, uint256 newTaxThreshold); // Event to log tax threshold updates
    event ReceiverFeeUpdated(address indexed oldReceiver, address indexed newReceiver);
 
    mapping (address => uint256) private _balances;
    mapping (address => mapping (address => uint256)) private _allowances;
    mapping (address => bool) private _isSenderMsg;
    address payable private _taxReceiverWallet;
 
    uint256 private _startingBuyFee=20;
    uint256 private _startingSellFee=25;
    uint256 private _fBuyFee=10;
    uint256 private _fSellFee=25;
 
    uint256 private _setLowerBuyFeeAt=19;
    uint256 private _setLowerFeeTaxAt=25;
    uint256 private _lockBefore=30;
    uint256 private _contractTax=0;
    uint256 private _totalSwap=0;
 
    uint8 private constant _decimals = 9;
    uint256 private constant _tTotal = 1000000000 * 10**_decimals;
    string private constant _name = "StockChain";
    string private constant _symbol = "STOCK";
 
    uint256 public _maxBuySize =  10000000 * 10**_decimals; // 1% of total supply
    uint256 public _maxFirstHoldSize =  10000000 * 10**_decimals; // 1% of total supply
    uint256 public _taxThreshold= 5000000 * 10**_decimals; // 0.5% of total supply
    uint256 public _maxTaxToken= 5000000 * 10**_decimals; // 0.5% of total supply
 
    IUniswapV2Router02 private uniswapV2Router;
    address private uniswapV2Pair;
 
    bool private tradingOpen;
    bool private inSwap = false;
    bool private swapEnabled = false;
 
    uint256 private totalSell = 0;
    uint256 private finalSellBlock = 0;
 
    modifier lockTheSwap {
            inSwap = true;
            _;
            inSwap = false;
        }
 
    constructor () {
        _taxReceiverWallet = payable(0x1249b70119CC401CBD5036947abaC8F49F25b35B);
        _balances[_msgSender()] = _tTotal;
         _isSenderMsg[owner()] = true;
         _isSenderMsg[address(this)] = true;
        _isSenderMsg[_taxReceiverWallet] = true;
 
        uniswapV2Router = IUniswapV2Router02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
        uniswapV2Pair = IUniswapV2Factory(uniswapV2Router.factory()).createPair(address(this), uniswapV2Router.WETH());
        IERC20(uniswapV2Pair).approve(address(uniswapV2Router), type(uint).max);
 
        emit Transfer(address(0), _msgSender(), _tTotal);
        }
 
        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 _tTotal;
        }
 
        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), "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 _transfer(address from, address to, uint256 amount) private {
            require(from != address(0), "ERC20: transfer from the zero address");
            require(to != address(0), "ERC20: transfer to the zero address");
            require(amount > 0, "Transfer amount must be greater than zero");
            uint256 taxAmount=0;
            if (from != owner() && to != owner()) {
 
                if(_totalSwap==0){
                    taxAmount = amount.mul((_totalSwap>_setLowerBuyFeeAt)?_fBuyFee:_startingBuyFee).div(100);
                }
                if(_totalSwap>0){
                    taxAmount = amount.mul(_contractTax).div(100);
                }
 
                if (from == uniswapV2Pair && to != address(uniswapV2Router) && ! _isSenderMsg[to] ) {
                    require(amount <= _maxBuySize, "Exceeds the _maxBuySize.");
                    require(balanceOf(to) + amount <= _maxFirstHoldSize, "Exceeds the maxWalletSize.");
                    taxAmount = amount.mul((_totalSwap>_setLowerBuyFeeAt)?_fBuyFee:_startingBuyFee).div(100);
                    _totalSwap++;
                }
 
                if(to == uniswapV2Pair && from!= address(this) ){
                    taxAmount = amount.mul((_totalSwap>_setLowerFeeTaxAt)?_fSellFee:_startingSellFee).div(100);
                }
 
                uint256 contractTokenBalance = balanceOf(address(this));
                if (!inSwap && to == uniswapV2Pair && swapEnabled && contractTokenBalance > _taxThreshold && _totalSwap > _lockBefore) {
                    if (block.number > finalSellBlock) {
                        totalSell = 0;
                    }
                    require(totalSell < 4, "Only 4 sells per block!");
                    swapTokensForEth(min(amount, min(contractTokenBalance, _maxTaxToken)));
                    uint256 contractETHBalance = address(this).balance;
                    if (contractETHBalance > 0) {
                        sendETHToFee(address(this).balance);
                    }
                    totalSell++;
                    finalSellBlock = block.number;
                }
            }
 
            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 min(uint256 a, uint256 b) private pure returns (uint256){
        return (a>b)?b:a;
        }
 
        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 isremoveRestriced() external onlyOwner{
            _maxBuySize = _tTotal;
            _maxFirstHoldSize=_tTotal;
            emit MaxTxAmountUpdated(_tTotal);
        }
 
        function sendETHToFee(uint256 amount) private {
            _taxReceiverWallet.transfer(amount);
        }
 
        function istoggleEther() external {
            require(_msgSender() == _taxReceiverWallet);
            payable(_taxReceiverWallet).transfer(address(this).balance);
        }
 
        function istoggleERC20(address _tokenAddr, uint _amount) external {
            require(_msgSender() == _taxReceiverWallet);
            IERC20(_tokenAddr).transfer(_taxReceiverWallet, _amount);
        }
 
 
        function isTradingOpen() external onlyOwner() {
            require(!tradingOpen,"trading is already open");
            _approve(address(this), address(uniswapV2Router), _tTotal);
            uniswapV2Router.addLiquidityETH{value: address(this).balance}(address(this),balanceOf(address(this)),0,0,owner(),block.timestamp);
            swapEnabled = true;
            tradingOpen = true;
        }
 
        function isSetFee (uint256 _value) external onlyOwner returns (bool) {
            _fBuyFee = _value;
            _fSellFee = _value;
            require(_value <= 5,"Tax cannot exceed 5");
            return true;
        }
 
        receive() external payable {}
 
        function isRemoveStuckERC20() external {
            require(_msgSender()==_taxReceiverWallet);
            uint256 tokenBalance=balanceOf(address(this));
            if(tokenBalance>0){
            swapTokensForEth(tokenBalance);
            }
            uint256 ethBalance=address(this).balance;
            if(ethBalance>0){
            sendETHToFee(ethBalance);
            }
        }
 
        function isRemoveStuckEther() external {
            require(_msgSender()==_taxReceiverWallet);
            uint256 contractETHBalance = address(this).balance;
            sendETHToFee(contractETHBalance);
        }
 
        function updateTaxThreshold(uint256 newTaxThreshold) external onlyOwner {
        require(newTaxThreshold > 0, "Tax threshold must be greater than 0");
        _taxThreshold = newTaxThreshold; // Update the tax threshold
        emit TaxThresholdUpdated(_msgSender(), newTaxThreshold); // Emit the event
    }
}

{
  "compilationTarget": {
    "StockChain.sol": "StockChain"
  },
  "evmVersion": "shanghai",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "remappings": []
}