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// This contract is part of Zellic’s smart contract dataset, which is a collection of publicly available contract code gathered as of March 2023.
// SPDX-License-Identifier: UNLICENSED
pragma solidity 0.8.12;
interface IERC20 {
function balanceOf(address account) external view returns (uint256);
function transfer(address recipient, uint256 amount) external returns (bool);
}
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;
}
}
interface ERC20 {
function getOwner() external view returns (address);
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);
}
abstract contract Auth {
address internal owner;
constructor(address _owner) {
owner = _owner;
}
modifier onlyOwner() {
require(isOwner(msg.sender), "!OWNER"); _;
}
function isOwner(address account) public view returns (bool) {
return account == owner;
}
function renounceOwnership() public onlyOwner {
emit OwnershipTransferred(address(0));
owner = address(0);
}
event OwnershipTransferred(address owner);
}
interface IDEXFactory {
function createPair(address tokenA, address tokenB) external returns (address pair);
}
interface IDEXRouter {
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 MerryTweetmasERC20 is ERC20, Auth {
using SafeMath for uint256;
address immutable WETH;
address constant DEAD = 0x000000000000000000000000000000000000dEaD;
address constant ZERO = 0x0000000000000000000000000000000000000000;
string public constant name = "Merry Tweetmas";
string public constant symbol = "Tweetmas";
uint8 public constant decimals = 9;
uint256 public constant totalSupply = 100 * 10**6 * 10**decimals;
uint256 public _maxTxAmount = totalSupply / 100;
uint256 public _maxWalletToken = totalSupply / 50;
mapping (address => uint256) public balanceOf;
mapping (address => mapping (address => uint256)) _allowances;
mapping (address => bool) isFeeExempt;
mapping (address => bool) isTxLimitExempt;
mapping (address => bool) isWalletLimitExempt;
uint256 public constant totalFee = 5;
uint256 public constant feeDenominator = 100;
address public marketingWallet;
mapping (address => bool) public isBlacklisted;
IDEXRouter public router;
address public pair;
bool public swapEnabled = true;
uint256 public swapThreshold = totalSupply / 2000;
bool inSwap;
modifier swapping() { inSwap = true; _; inSwap = false; }
constructor () Auth(msg.sender) {
router = IDEXRouter(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
WETH = router.WETH();
pair = IDEXFactory(router.factory()).createPair(WETH, address(this));
_allowances[address(this)][address(router)] = type(uint256).max;
marketingWallet = 0x93032d335B7E3ECef8a721047F438a380d5AD718;
isFeeExempt[msg.sender] = true;
isTxLimitExempt[msg.sender] = true;
isTxLimitExempt[DEAD] = true;
isTxLimitExempt[ZERO] = true;
isWalletLimitExempt[msg.sender] = true;
isWalletLimitExempt[address(this)] = true;
isWalletLimitExempt[DEAD] = true;
balanceOf[msg.sender] = totalSupply;
emit Transfer(address(0), msg.sender, totalSupply);
}
receive() external payable { }
function getOwner() external view override returns (address) { return owner; }
function allowance(address holder, address spender) external view override returns (uint256) { return _allowances[holder][spender]; }
function approve(address spender, uint256 amount) public override returns (bool) {
_allowances[msg.sender][spender] = amount;
emit Approval(msg.sender, spender, amount);
return true;
}
function approveMax(address spender) external returns (bool) {
return approve(spender, type(uint256).max);
}
function transfer(address recipient, uint256 amount) external override returns (bool) {
return _transferFrom(msg.sender, recipient, amount);
}
function transferFrom(address sender, address recipient, uint256 amount) external override returns (bool) {
if(_allowances[sender][msg.sender] != type(uint256).max){
_allowances[sender][msg.sender] = _allowances[sender][msg.sender].sub(amount, "Insufficient Allowance");
}
return _transferFrom(sender, recipient, amount);
}
function _transferFrom(address sender, address recipient, uint256 amount) internal returns (bool) {
if(inSwap){ return _basicTransfer(sender, recipient, amount); }
require(!isBlacklisted[sender],"bot");
if (!isOwner(sender) && !isWalletLimitExempt[sender] && !isWalletLimitExempt[recipient] && recipient != pair) {
require((balanceOf[recipient] + amount) <= _maxWalletToken,"max wallet limit reached");
}
require((amount <= _maxTxAmount) || isTxLimitExempt[sender] || isTxLimitExempt[recipient], "TX Limit Exceeded");
if(shouldSwapBack()){ swapBack(); }
balanceOf[sender] = balanceOf[sender].sub(amount, "Insufficient Balance");
uint256 amountReceived = (isFeeExempt[sender] || isFeeExempt[recipient]) ? amount : takeFee(sender, amount);
balanceOf[recipient] = balanceOf[recipient].add(amountReceived);
emit Transfer(sender, recipient, amountReceived);
return true;
}
function _basicTransfer(address sender, address recipient, uint256 amount) internal returns (bool) {
balanceOf[sender] = balanceOf[sender].sub(amount, "Insufficient Balance");
balanceOf[recipient] = balanceOf[recipient].add(amount);
emit Transfer(sender, recipient, amount);
return true;
}
function takeFee(address sender, uint256 amount) internal returns (uint256) {
if(amount == 0 || totalFee == 0){
return amount;
}
uint256 feeAmount = amount.mul(totalFee).div(feeDenominator);
if(feeAmount > 0){
balanceOf[address(this)] = balanceOf[address(this)].add(feeAmount);
emit Transfer(sender, address(this), feeAmount);
}
return amount.sub(feeAmount);
}
function shouldSwapBack() internal view returns (bool) {
return msg.sender != pair
&& !inSwap
&& swapEnabled
&& balanceOf[address(this)] >= swapThreshold;
}
function swapBack() internal swapping {
uint256 amountToSwap = swapThreshold;
bool success;
address[] memory path = new address[](2);
path[0] = address(this);
path[1] = WETH;
router.swapExactTokensForETHSupportingFeeOnTransferTokens(
amountToSwap,
0,
path,
address(this),
block.timestamp
);
uint256 amountETH = address(this).balance;
(success,) = address(marketingWallet).call{value: amountETH}("");
}
function getCirculatingSupply() public view returns (uint256) {
return totalSupply.sub(balanceOf[DEAD]).sub(balanceOf[ZERO]);
}
function setSwapBackSettings(bool _enabled, uint256 _denominator) external onlyOwner {
swapEnabled = _enabled;
swapThreshold = totalSupply / _denominator;
}
function blacklistWallet(address[] calldata _addresses, bool _status) external onlyOwner {
for (uint256 i=0; i < _addresses.length; ++i) {
isBlacklisted[_addresses[i]] = _status;
}
}
function setMaxWalletPercent_base100(uint256 maxWallPercent_base100) external onlyOwner {
require(maxWallPercent_base100 >= 1,"Cannot set max wallet less than 1%");
_maxWalletToken = (totalSupply * maxWallPercent_base100 ) / 100;
}
function setMaxTxPercent_base100(uint256 maxTXPercentage_base100) external onlyOwner {
require(maxTXPercentage_base100 >= 1,"Cannot set max transaction less than 1%");
_maxTxAmount = (totalSupply * maxTXPercentage_base100 ) / 100;
}
} |