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pragma solidity 0.8.12;
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interface IERC20 {
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function balanceOf(address account) external view returns (uint256);
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function transfer(address recipient, uint256 amount) external returns (bool);
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}
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library SafeMath {
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function add(uint256 a, uint256 b) internal pure returns (uint256) {
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uint256 c = a + b;
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require(c >= a, "SafeMath: addition overflow");
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return c;
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}
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function sub(uint256 a, uint256 b) internal pure returns (uint256) {
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return sub(a, b, "SafeMath: subtraction overflow");
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}
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function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
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require(b <= a, errorMessage);
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uint256 c = a - b;
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return c;
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}
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function mul(uint256 a, uint256 b) internal pure returns (uint256) {
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if (a == 0) {
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return 0;
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}
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uint256 c = a * b;
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require(c / a == b, "SafeMath: multiplication overflow");
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return c;
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}
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function div(uint256 a, uint256 b) internal pure returns (uint256) {
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return div(a, b, "SafeMath: division by zero");
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}
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function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
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require(b > 0, errorMessage);
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uint256 c = a / b;
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return c;
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}
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}
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interface ERC20 {
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function getOwner() external view returns (address);
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function balanceOf(address account) external view returns (uint256);
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function transfer(address recipient, uint256 amount) external returns (bool);
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function allowance(address _owner, address spender) external view returns (uint256);
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function approve(address spender, uint256 amount) external returns (bool);
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function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
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event Transfer(address indexed from, address indexed to, uint256 value);
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event Approval(address indexed owner, address indexed spender, uint256 value);
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}
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abstract contract Auth {
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address internal owner;
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constructor(address _owner) {
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owner = _owner;
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}
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modifier onlyOwner() {
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require(isOwner(msg.sender), "!OWNER"); _;
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}
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function isOwner(address account) public view returns (bool) {
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return account == owner;
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}
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function renounceOwnership() public onlyOwner {
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emit OwnershipTransferred(address(0));
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owner = address(0);
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}
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event OwnershipTransferred(address owner);
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}
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interface IDEXFactory {
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function createPair(address tokenA, address tokenB) external returns (address pair);
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}
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interface IDEXRouter {
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function factory() external pure returns (address);
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function WETH() external pure returns (address);
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function swapExactTokensForETHSupportingFeeOnTransferTokens(
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uint amountIn,
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uint amountOutMin,
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address[] calldata path,
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address to,
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uint deadline
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) external;
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}
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contract MerryTweetmasERC20 is ERC20, Auth {
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using SafeMath for uint256;
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address immutable WETH;
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address constant DEAD = 0x000000000000000000000000000000000000dEaD;
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address constant ZERO = 0x0000000000000000000000000000000000000000;
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string public constant name = "Merry Tweetmas";
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string public constant symbol = "Tweetmas";
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uint8 public constant decimals = 9;
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uint256 public constant totalSupply = 100 * 10**6 * 10**decimals;
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uint256 public _maxTxAmount = totalSupply / 100;
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uint256 public _maxWalletToken = totalSupply / 50;
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mapping (address => uint256) public balanceOf;
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mapping (address => mapping (address => uint256)) _allowances;
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mapping (address => bool) isFeeExempt;
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mapping (address => bool) isTxLimitExempt;
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mapping (address => bool) isWalletLimitExempt;
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uint256 public constant totalFee = 5;
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uint256 public constant feeDenominator = 100;
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address public marketingWallet;
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mapping (address => bool) public isBlacklisted;
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IDEXRouter public router;
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address public pair;
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bool public swapEnabled = true;
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uint256 public swapThreshold = totalSupply / 2000;
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bool inSwap;
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modifier swapping() { inSwap = true; _; inSwap = false; }
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constructor () Auth(msg.sender) {
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router = IDEXRouter(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
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WETH = router.WETH();
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pair = IDEXFactory(router.factory()).createPair(WETH, address(this));
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_allowances[address(this)][address(router)] = type(uint256).max;
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marketingWallet = 0x93032d335B7E3ECef8a721047F438a380d5AD718;
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isFeeExempt[msg.sender] = true;
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isTxLimitExempt[msg.sender] = true;
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isTxLimitExempt[DEAD] = true;
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isTxLimitExempt[ZERO] = true;
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isWalletLimitExempt[msg.sender] = true;
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isWalletLimitExempt[address(this)] = true;
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isWalletLimitExempt[DEAD] = true;
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balanceOf[msg.sender] = totalSupply;
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emit Transfer(address(0), msg.sender, totalSupply);
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}
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receive() external payable { }
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function getOwner() external view override returns (address) { return owner; }
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function allowance(address holder, address spender) external view override returns (uint256) { return _allowances[holder][spender]; }
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function approve(address spender, uint256 amount) public override returns (bool) {
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_allowances[msg.sender][spender] = amount;
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emit Approval(msg.sender, spender, amount);
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return true;
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}
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function approveMax(address spender) external returns (bool) {
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return approve(spender, type(uint256).max);
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}
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function transfer(address recipient, uint256 amount) external override returns (bool) {
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return _transferFrom(msg.sender, recipient, amount);
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}
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function transferFrom(address sender, address recipient, uint256 amount) external override returns (bool) {
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if(_allowances[sender][msg.sender] != type(uint256).max){
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_allowances[sender][msg.sender] = _allowances[sender][msg.sender].sub(amount, "Insufficient Allowance");
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}
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return _transferFrom(sender, recipient, amount);
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}
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function _transferFrom(address sender, address recipient, uint256 amount) internal returns (bool) {
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if(inSwap){ return _basicTransfer(sender, recipient, amount); }
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require(!isBlacklisted[sender],"bot");
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if (!isOwner(sender) && !isWalletLimitExempt[sender] && !isWalletLimitExempt[recipient] && recipient != pair) {
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require((balanceOf[recipient] + amount) <= _maxWalletToken,"max wallet limit reached");
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}
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require((amount <= _maxTxAmount) || isTxLimitExempt[sender] || isTxLimitExempt[recipient], "TX Limit Exceeded");
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if(shouldSwapBack()){ swapBack(); }
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balanceOf[sender] = balanceOf[sender].sub(amount, "Insufficient Balance");
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uint256 amountReceived = (isFeeExempt[sender] || isFeeExempt[recipient]) ? amount : takeFee(sender, amount);
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balanceOf[recipient] = balanceOf[recipient].add(amountReceived);
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emit Transfer(sender, recipient, amountReceived);
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return true;
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}
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function _basicTransfer(address sender, address recipient, uint256 amount) internal returns (bool) {
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balanceOf[sender] = balanceOf[sender].sub(amount, "Insufficient Balance");
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balanceOf[recipient] = balanceOf[recipient].add(amount);
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emit Transfer(sender, recipient, amount);
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return true;
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}
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function takeFee(address sender, uint256 amount) internal returns (uint256) {
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if(amount == 0 || totalFee == 0){
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return amount;
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}
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uint256 feeAmount = amount.mul(totalFee).div(feeDenominator);
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if(feeAmount > 0){
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balanceOf[address(this)] = balanceOf[address(this)].add(feeAmount);
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emit Transfer(sender, address(this), feeAmount);
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}
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return amount.sub(feeAmount);
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}
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function shouldSwapBack() internal view returns (bool) {
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return msg.sender != pair
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&& !inSwap
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&& swapEnabled
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&& balanceOf[address(this)] >= swapThreshold;
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}
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function swapBack() internal swapping {
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uint256 amountToSwap = swapThreshold;
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bool success;
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address[] memory path = new address[](2);
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path[0] = address(this);
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path[1] = WETH;
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router.swapExactTokensForETHSupportingFeeOnTransferTokens(
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amountToSwap,
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0,
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path,
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address(this),
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block.timestamp
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);
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uint256 amountETH = address(this).balance;
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(success,) = address(marketingWallet).call{value: amountETH}("");
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}
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function getCirculatingSupply() public view returns (uint256) {
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return totalSupply.sub(balanceOf[DEAD]).sub(balanceOf[ZERO]);
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}
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function setSwapBackSettings(bool _enabled, uint256 _denominator) external onlyOwner {
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swapEnabled = _enabled;
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swapThreshold = totalSupply / _denominator;
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}
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function blacklistWallet(address[] calldata _addresses, bool _status) external onlyOwner {
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for (uint256 i=0; i < _addresses.length; ++i) {
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isBlacklisted[_addresses[i]] = _status;
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}
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}
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function setMaxWalletPercent_base100(uint256 maxWallPercent_base100) external onlyOwner {
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require(maxWallPercent_base100 >= 1,"Cannot set max wallet less than 1%");
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_maxWalletToken = (totalSupply * maxWallPercent_base100 ) / 100;
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}
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function setMaxTxPercent_base100(uint256 maxTXPercentage_base100) external onlyOwner {
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require(maxTXPercentage_base100 >= 1,"Cannot set max transaction less than 1%");
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_maxTxAmount = (totalSupply * maxTXPercentage_base100 ) / 100;
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}
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} |
