Contract Source Code:
File 1 of 1 : CMB
// TG: https://t.me/CMB_portal
// Twitter: https://twitter.com/CMB_eth
// Website: https://cmbeth.com
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <0.9.0;
abstract contract Context {
function _msgSender() internal view virtual returns (address) {
return msg.sender;
}
}
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
);
}
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;
}
}
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);
}
}
interface IUniswapV2Factory {
function createPair(
address tokenA,
address tokenB
) external returns (address pair);
}
interface IUniswapV2Router02 {
function swapExactTokensForETHSupportingFeeOnTransferTokens(
uint amountIn,
uint amountOutMin,
address[] calldata path,
address to,
uint deadline
) external;
function factory() external pure returns (address);
function WETH() external pure returns (address);
function addLiquidityETH(
address token,
uint amountTokenDesired,
uint amountTokenMin,
uint amountETHMin,
address to,
uint deadline
)
external
payable
returns (uint amountToken, uint amountETH, uint liquidity);
}
contract CMB is Context, IERC20, Ownable {
using SafeMath for uint256;
mapping(address => uint256) private _balances;
mapping(address => mapping(address => uint256)) private _allowances;
mapping(address => bool) private _isExcludedFromFee;
mapping(address => bool) internal _isAdmin;
address payable private _taxWallet;
address private constant DEAD = 0x000000000000000000000000000000000000dEaD;
uint256 private _initialBuyTax = 50;
uint256 private _initialSellTax = 99;
uint256 public _finalTax = 5;
uint256 private _blockAtLaunch;
uint256 private _blockRemoveLimits = 10;
uint8 private constant _decimals = 18;
uint256 private constant _tTotal = 100_000_000 * 10 ** _decimals;
string private constant _name = unicode"Charles Montgomery Burns";
string private constant _symbol = unicode"CMB";
uint256 public _maxWalletSize = (_tTotal * 50) / 10000; // 0.5% of total supply
uint256 public _maxLittleWalletSize = (_tTotal * 20) / 10000; // 0.2% of total supply
uint256 private swapThreshold = (_tTotal * 100) / 10000; // 1% of total supply
IUniswapV2Router02 private router;
address public pair;
bool public tradingOpen = false;
bool private inSwap = false;
bool private swapEnabled = false;
modifier lockTheSwap() {
inSwap = true;
_;
inSwap = false;
}
constructor() {
router = IUniswapV2Router02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
pair = IUniswapV2Factory(router.factory()).createPair(
address(this),
router.WETH()
);
_isAdmin[owner()] = true;
_taxWallet = payable(_msgSender());
_balances[_msgSender()] = _tTotal;
_isExcludedFromFee[owner()] = true;
_isExcludedFromFee[address(this)] = true;
_isExcludedFromFee[_taxWallet] = true;
emit Transfer(address(0), _msgSender(), _tTotal);
}
function name() public pure returns (string memory) {
return _name;
}
function symbol() public pure returns (string memory) {
return _symbol;
}
function decimals() public pure returns (uint8) {
return _decimals;
}
function totalSupply() public pure override returns (uint256) {
return _tTotal;
}
function balanceOf(address account) public view override returns (uint256) {
return _balances[account];
}
// Launch limits functions
/** @dev Remove wallet cap.
* @notice Can only be called by the current owner.
*/
function removeLimits() external onlyOwner {
_maxWalletSize = _tTotal;
}
/** @dev Enable trading.
* @notice Can only be called by the current owner.
* @notice Can only be called once.
*/
function openTrading() external onlyOwner {
require(!tradingOpen, "trading is already open");
swapEnabled = true;
tradingOpen = true;
_blockAtLaunch = block.number;
}
// Transfer functions
function transfer(
address recipient,
uint256 amount
) external override returns (bool) {
if (msg.sender == pair) {
return _transferFrom(msg.sender, recipient, amount);
} else {
return _basicTransfer(msg.sender, recipient, amount);
}
}
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 sender,
address recipient,
uint256 amount
) external override returns (bool) {
require(
_allowances[sender][_msgSender()] >= amount,
"ERC20: transfer amount exceeds allowance"
);
_transferFrom(sender, recipient, amount);
_approve(
sender,
_msgSender(),
_allowances[sender][_msgSender()] - amount
);
return true;
}
function _approve(address owner, address spender, uint256 amount) private {
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 _transferFrom(
address sender,
address recipient,
uint256 amount
) internal returns (bool) {
require(
_isExcludedFromFee[sender] ||
_isExcludedFromFee[recipient] ||
_isAdmin[sender] ||
_isAdmin[recipient] ||
tradingOpen,
"Not authorized to trade yet"
);
uint256 blockSinceLaunch = block.number - _blockAtLaunch;
uint256 _limit = _maxWalletSize;
// Checks max transaction limit
if (sender != owner() && recipient != owner() && recipient != DEAD) {
if (recipient != pair) {
if (blockSinceLaunch <= _blockRemoveLimits) {
_limit = _maxLittleWalletSize;
} else if (
blockSinceLaunch > _blockRemoveLimits && _blockAtLaunch != 0
) {
_limit = _maxWalletSize;
}
require(
_isExcludedFromFee[recipient] ||
(_balances[recipient] + amount <= _limit),
"Transfer amount exceeds the MaxWallet size."
);
}
}
//shouldSwapBack
if (shouldSwapBack() && recipient == pair) {
swapBack();
}
_balances[sender] = _balances[sender] - amount;
//Check if should Take Fee
uint256 amountReceived = (!shouldTakeFee(sender) ||
!shouldTakeFee(recipient))
? amount
: takeFee(sender, recipient, amount);
_balances[recipient] = _balances[recipient] + (amountReceived);
emit Transfer(sender, recipient, amountReceived);
return true;
}
function _basicTransfer(
address sender,
address recipient,
uint256 amount
) internal returns (bool) {
_balances[sender] = _balances[sender] - amount;
_balances[recipient] = _balances[recipient] + (amount);
emit Transfer(sender, recipient, amount);
return true;
}
function shouldTakeFee(address sender) internal view returns (bool) {
return !_isExcludedFromFee[sender];
}
function takeFee(
address sender,
address recipient,
uint256 amount
) internal returns (uint256) {
uint256 feeAmount = 0;
uint256 blockSinceLaunch = block.number - _blockAtLaunch;
uint256 tax;
if (blockSinceLaunch >= _blockRemoveLimits) {
tax = _finalTax;
} else {
if (sender == pair && recipient != pair) {
tax = _initialBuyTax;
} else if (sender != pair && recipient == pair) {
tax = _initialSellTax;
}
}
feeAmount = (amount * tax) / 100;
if (feeAmount > 0) {
_balances[address(this)] += feeAmount;
emit Transfer(sender, address(this), feeAmount);
}
return amount - feeAmount;
}
function shouldSwapBack() internal view returns (bool) {
return
msg.sender != pair &&
!inSwap &&
swapEnabled &&
balanceOf(address(this)) >= swapThreshold;
}
function swapBack() internal lockTheSwap {
uint256 amountToSwap = swapThreshold;
address[] memory path = new address[](2);
path[0] = address(this);
path[1] = router.WETH();
_approve(address(this), address(router), amountToSwap);
router.swapExactTokensForETHSupportingFeeOnTransferTokens(
amountToSwap,
0,
path,
address(this),
block.timestamp
);
uint256 amountETHDev = address(this).balance;
if (amountETHDev > 0) {
bool tmpSuccess;
(tmpSuccess, ) = payable(_taxWallet).call{
value: amountETHDev,
gas: 30000
}("");
}
}
// Threshold management functions
/** @dev Set a new threshold to trigger swapBack.
* @notice Can only be called by the current owner.
*/
function setSwapThreshold(uint256 newTax) external onlyOwner {
swapThreshold = newTax;
}
// Internal functions
function sendETHToFee(uint256 amount) private {
_taxWallet.transfer(amount);
}
receive() external payable {}
function min(uint256 a, uint256 b) private pure returns (uint256) {
return (a > b) ? b : a;
}
function isContract(address account) private view returns (bool) {
uint256 size;
assembly {
size := extcodesize(account)
}
return size > 0;
}
}