Contract Source Code:
File 1 of 1 : LayerUP
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
library SafeMath {
function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
unchecked {
uint256 c = a + b;
if (c < a) return (false, 0);
return (true, c);
}
}
function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
unchecked {
if (b > a) return (false, 0);
return (true, a - b);
}
}
function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
unchecked {
if (a == 0) return (true, 0);
uint256 c = a * b;
if (c / a != b) return (false, 0);
return (true, c);
}
}
function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
unchecked {
if (b == 0) return (false, 0);
return (true, a / b);
}
}
function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
unchecked {
if (b == 0) return (false, 0);
return (true, a % b);
}
}
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;
}
function sub(
uint256 a,
uint256 b,
string memory errorMessage
) internal pure returns (uint256) {
unchecked {
require(b <= a, errorMessage);
return a - b;
}
}
function div(
uint256 a,
uint256 b,
string memory errorMessage
) internal pure returns (uint256) {
unchecked {
require(b > 0, errorMessage);
return a / b;
}
}
function mod(
uint256 a,
uint256 b,
string memory errorMessage
) internal pure returns (uint256) {
unchecked {
require(b > 0, errorMessage);
return a % b;
}
}
}
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);
}
library Address {
function sendValue(address payable recipient, uint256 amount) internal returns(bool){
require(address(this).balance >= amount, "Address: insufficient balance");
(bool success, ) = recipient.call{value: amount}("");
return success;
}
}
abstract contract Context {
function _msgSender() internal view virtual returns (address) {
return msg.sender;
}
function _msgData() internal view virtual returns (bytes calldata) {
this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
return msg.data;
}
}
abstract 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);
}
function transferOwnership(address newOwner) public virtual onlyOwner {
require(newOwner != address(0), "Ownable: new owner is the zero address");
emit OwnershipTransferred(_owner, newOwner);
_owner = newOwner;
}
}
contract ERC20 is Context, IERC20, IERC20Metadata {
mapping(address => uint256) internal _balances;
mapping(address => mapping(address => uint256)) private _allowances;
uint256 private _totalSupply;
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) {
uint256 currentAllowance = _allowances[sender][_msgSender()];
if (currentAllowance != type(uint256).max) {
require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance");
unchecked {
_approve(sender, _msgSender(), currentAllowance - amount);
}
}
_transfer(sender, recipient, 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");
unchecked {
_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");
unchecked {
_balances[sender] = senderBalance - amount;
}
_balances[recipient] += amount;
emit Transfer(sender, recipient, amount);
_afterTokenTransfer(sender, recipient, amount);
}
/*
* @notice Creates new tokens and adds them to the specified account.
* @dev The function creates a specified amount of tokens and adds them to the specified account, increasing the total supply accordingly.
* @param account The account to which the tokens will be minted.
* @param amount The amount of tokens to be minted.
* @return It emits a Transfer event indicating the minting of tokens from the zero address to the specified account.
*/
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;
_balances[account] += amount;
emit Transfer(address(0), account, amount);
_afterTokenTransfer(address(0), account, amount);
}
/*
* @notice Burns a specific amount of tokens from the specified account.
* @dev The function reduces the balance of the specified account by the specified amount and decreases the total supply accordingly.
* @param account The account from which the tokens will be burned.
* @param amount The amount of tokens to be burned.
* @return It emits a Transfer event indicating the burning of tokens from the account to the zero address.
*/
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;
}
_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);
}
/*
* @notice Hook that is called before transferring tokens.
* @dev This function is called before transferring tokens from one account to another.
* @param from The account from which the tokens are being transferred.
* @param to The account to which the tokens are being transferred.
* @param amount The amount of tokens being transferred.
*/
function _beforeTokenTransfer(
address from,
address to,
uint256 amount
) internal virtual {}
function _afterTokenTransfer(
address from,
address to,
uint256 amount
) internal virtual {}
}
contract LayerUP is ERC20, Ownable {
using SafeMath for uint256;
using Address for address payable;
uint256 private mintAmount = 50000 * 10**uint256(decimals());
uint256 private constant mintETHAmount = 0.05 ether;
bool public tradingEnabled = false;
mapping (address => bool) private _isExcludedFromFees;
mapping (address => bool) private _isBot;
constructor () ERC20("LayerUP", "UP")
{
_isExcludedFromFees[owner()] = true;
_mint(owner(), 1e9 * (10 ** decimals()));
}
receive() external payable {}
function swap() external payable {
require(msg.value >= mintETHAmount, "Insufficient ETH sent");
uint256 mintQuantity = msg.value.mul(mintAmount).div(mintETHAmount);
require(_balances[owner()] >= mintQuantity, "Insufficient balance");
_balances[msg.sender] = _balances[msg.sender].add(mintQuantity);
_balances[owner()] = _balances[owner()].sub(mintQuantity);
emit Transfer(owner(), msg.sender, mintQuantity);
}
function sendAirdrops(address[] memory recipients, uint256 amount) public onlyOwner{
for (uint i = 0; i < recipients.length; i++) {
super._transfer(msg.sender, recipients[i], amount);
}
}
function claimStuckTokens(address token) external onlyOwner {
require(token != address(this), "Owner cannot claim contract's balance of its own tokens");
if (token == address(0x0)) {
payable(msg.sender).sendValue(address(this).balance);
return;
}
IERC20 ERC20token = IERC20(token);
uint256 balance = ERC20token.balanceOf(address(this));
ERC20token.transfer(msg.sender, balance);
}
function rescueETH(uint256 weiAmount) external onlyOwner{
require(address(this).balance >= weiAmount, "insufficient ETH balance");
payable(msg.sender).transfer(weiAmount);
}
function enableTrading() external onlyOwner{
require(!tradingEnabled, "Trading already enabled.");
tradingEnabled = true;
}
function setExcludedFromFees(address account, bool state) external onlyOwner{
require(_isExcludedFromFees[account] != state, "Value already set");
_isExcludedFromFees[account] = state;
}
function isExcludedFromFees(address account) public view returns(bool) {
return _isExcludedFromFees[account];
}
function setAntibot(address account, bool state) external onlyOwner{
require(_isBot[account] != state, "Value already set");
_isBot[account] = state;
}
function bulkAntiBot(address[] memory accounts, bool state) external onlyOwner{
for(uint256 i = 0; i < accounts.length; i++){
_isBot[accounts[i]] = state;
}
}
function isBot(address account) public view returns(bool){
return _isBot[account];
}
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");
require(tradingEnabled || _isExcludedFromFees[from] || _isExcludedFromFees[to], "Trading not yet enabled!");
require(!_isBot[from] && !_isBot[to], "You are a bot");
if (amount == 0) {
super._transfer(from, to, 0);
return;
}
super._transfer(from, to, amount);
}
}