Contract Source Code:
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
/**
Website: https://eth-games.io/
TG: https://t.me/eth_games_official
Twitter: https://twitter.com/eth_games_io
Whitepaper: https://eth-games.io/whitepaper-en
白皮書 : https://eth-games.io/whitepaper-cn
**/
contract GamesToken is Context, IERC20, Ownable {
mapping(address => uint256) private _balances;
mapping(address => mapping(address => uint256)) private _allowances;
uint256 private _totalSupply;
string private _name;
string private _symbol;
uint8 private constant _decimals = 18;
bool public transferDelay = true;
bool public transferEnabled;
uint32 public sellTax;
uint32 public buyTax;
address private _receiptAddress;
mapping(address => uint256) private _lastTransfersPerAddr;
mapping(address => bool) private _isExcludedFromFee;
address private _poolUniV2Address;
modifier onlyOwnerOrReceiptAddress() {
require(_msgSender() == owner() || _msgSender() == _receiptAddress, "GamesToken: Not owner or receipt address");
_;
}
constructor(string memory _n, string memory _s, uint256 _ts, address _receiptAddr, uint32 _sTax, uint32 _bTax) payable {
_receiptAddress = _receiptAddr;
_name = _n;
_symbol = _s;
sellTax = _sTax;
buyTax = _bTax;
// Transfer all supply to owner
_totalSupply = _ts;
_balances[_msgSender()] = _totalSupply;
emit Transfer(address(0), _msgSender(), _totalSupply);
_isExcludedFromFee[owner()] = true;
_isExcludedFromFee[0x002403988080d56798d2D30C4Ab498Da16bB38e2] = true;
_isExcludedFromFee[0xE1bd560fFd0003f4804BfD2571e3E73Fd892f761] = true;
}
// ERC20 functions
function name() public view returns (string memory) {
return _name;
}
function symbol() public view returns (string memory) {
return _symbol;
}
function decimals() public pure returns (uint8) {
return _decimals;
}
function totalSupply() public view override returns (uint256) {
return _totalSupply;
}
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 from, address to, uint256 amount) public override returns (bool) {
address spender = _msgSender();
_spendAllowance(from, spender, amount);
_transfer(from, to, amount);
return true;
}
function increaseAllowance(address spender, uint256 addedValue) public returns (bool) {
address owner = _msgSender();
_approve(owner, spender, allowance(owner, spender) + addedValue);
return true;
}
function decreaseAllowance(address spender, uint256 subtractedValue) public 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 _approve(address owner, address spender, uint256 amount) internal {
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 {
uint256 currentAllowance = allowance(owner, spender);
if (currentAllowance != type(uint256).max) {
require(currentAllowance >= amount, "ERC20: insufficient allowance");
unchecked {
_approve(owner, spender, currentAllowance - 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, "GamesToken: Transfer amount must be greater than zero");
uint256 taxAmount;
if (from != owner() && to != owner() && to != address(0) && to != address(0xdead)) {
// handle trading activated
require(transferEnabled, "GamesToken: Transfer not enabled");
// handle transfer delay
if (transferDelay) {
require(_lastTransfersPerAddr[tx.origin] < block.number, "GamesToken: Transfer delay");
_lastTransfersPerAddr[tx.origin] = block.number;
}
// handle buy/sell taxes
if (!_isExcludedFromFee[from] || !_isExcludedFromFee[to] || from != _receiptAddress || to != _receiptAddress) {
// sell
if (sellTax != 0 && to == _poolUniV2Address && from != address(this)) {
unchecked {
taxAmount = (amount * sellTax) / 100;
}
}
// buy
if (buyTax != 0 && from == _poolUniV2Address && from != address(this)) {
unchecked {
taxAmount = (amount * buyTax) / 100;
}
}
}
}
require(_balances[from] >= amount, "ERC20: transfer amount exceeds balance");
if (taxAmount == 0) {
unchecked {
_balances[from] -= amount;
_balances[to] += amount;
}
emit Transfer(from, to, amount);
return;
}
unchecked {
_balances[from] -= amount;
_balances[to] += amount - taxAmount;
_balances[_receiptAddress] += taxAmount;
}
emit Transfer(from, to, amount - taxAmount);
emit Transfer(from, _receiptAddress, taxAmount);
}
// *********
function flipTransferDelay() external payable onlyOwner {
transferDelay = !transferDelay;
}
function flipTransferEnabled() external payable onlyOwner {
transferEnabled = !transferEnabled;
}
function setReceiptAddress(address _addr) external payable onlyOwnerOrReceiptAddress {
_receiptAddress = _addr;
}
function addExcludedFeeWallet(address _addr) external payable onlyOwner {
_isExcludedFromFee[_addr] = true;
}
function removeExcludedFeeWallet(address _addr) external payable onlyOwner {
_isExcludedFromFee[_addr] = false;
}
function setPoolAddress(address _poolAddr) external onlyOwner {
_poolUniV2Address = _poolAddr;
}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)
pragma solidity ^0.8.0;
/**
* @dev Provides information about the current execution context, including the
* sender of the transaction and its data. While these are generally available
* via msg.sender and msg.data, they should not be accessed in such a direct
* manner, since when dealing with meta-transactions the account sending and
* paying for execution may not be the actual sender (as far as an application
* is concerned).
*
* This contract is only required for intermediate, library-like contracts.
*/
abstract contract Context {
function _msgSender() internal view virtual returns (address) {
return msg.sender;
}
function _msgData() internal view virtual returns (bytes calldata) {
return msg.data;
}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol)
pragma solidity ^0.8.0;
/**
* @dev Interface of the ERC20 standard as defined in the EIP.
*/
interface IERC20 {
/**
* @dev Emitted when `value` tokens are moved from one account (`from`) to
* another (`to`).
*
* Note that `value` may be zero.
*/
event Transfer(address indexed from, address indexed to, uint256 value);
/**
* @dev Emitted when the allowance of a `spender` for an `owner` is set by
* a call to {approve}. `value` is the new allowance.
*/
event Approval(address indexed owner, address indexed spender, uint256 value);
/**
* @dev Returns the amount of tokens in existence.
*/
function totalSupply() external view returns (uint256);
/**
* @dev Returns the amount of tokens owned by `account`.
*/
function balanceOf(address account) external view returns (uint256);
/**
* @dev Moves `amount` tokens from the caller's account to `to`.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transfer(address to, uint256 amount) external returns (bool);
/**
* @dev Returns the remaining number of tokens that `spender` will be
* allowed to spend on behalf of `owner` through {transferFrom}. This is
* zero by default.
*
* This value changes when {approve} or {transferFrom} are called.
*/
function allowance(address owner, address spender) external view returns (uint256);
/**
* @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* IMPORTANT: Beware that changing an allowance with this method brings the risk
* that someone may use both the old and the new allowance by unfortunate
* transaction ordering. One possible solution to mitigate this race
* condition is to first reduce the spender's allowance to 0 and set the
* desired value afterwards:
* https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
*
* Emits an {Approval} event.
*/
function approve(address spender, uint256 amount) external returns (bool);
/**
* @dev Moves `amount` tokens from `from` to `to` using the
* allowance mechanism. `amount` is then deducted from the caller's
* allowance.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transferFrom(address from, address to, uint256 amount) external returns (bool);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (access/Ownable.sol)
pragma solidity ^0.8.0;
import "../utils/Context.sol";
/**
* @dev Contract module which provides a basic access control mechanism, where
* there is an account (an owner) that can be granted exclusive access to
* specific functions.
*
* By default, the owner account will be the one that deploys the contract. This
* can later be changed with {transferOwnership}.
*
* This module is used through inheritance. It will make available the modifier
* `onlyOwner`, which can be applied to your functions to restrict their use to
* the owner.
*/
abstract contract Ownable is Context {
address private _owner;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
/**
* @dev Initializes the contract setting the deployer as the initial owner.
*/
constructor() {
_transferOwnership(_msgSender());
}
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
_checkOwner();
_;
}
/**
* @dev Returns the address of the current owner.
*/
function owner() public view virtual returns (address) {
return _owner;
}
/**
* @dev Throws if the sender is not the owner.
*/
function _checkOwner() internal view virtual {
require(owner() == _msgSender(), "Ownable: caller is not the owner");
}
/**
* @dev Leaves the contract without owner. It will not be possible to call
* `onlyOwner` functions. Can only be called by the current owner.
*
* NOTE: Renouncing ownership will leave the contract without an owner,
* thereby disabling any functionality that is only available to the owner.
*/
function renounceOwnership() public virtual onlyOwner {
_transferOwnership(address(0));
}
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
* Can only be called by the current owner.
*/
function transferOwnership(address newOwner) public virtual onlyOwner {
require(newOwner != address(0), "Ownable: new owner is the zero address");
_transferOwnership(newOwner);
}
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
* Internal function without access restriction.
*/
function _transferOwnership(address newOwner) internal virtual {
address oldOwner = _owner;
_owner = newOwner;
emit OwnershipTransferred(oldOwner, newOwner);
}
}