Contract Source Code:
File 1 of 1 : Nexan
// SPDX-License-Identifier: Unlicensed
pragma solidity ^0.8.19;
library Address {
function isContract(address account) internal view returns (bool) {
// According to EIP-1052, 0x0 is the value returned for not-yet created accounts
// and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned
// for accounts without code, i.e. `keccak256('')`
bytes32 codehash;
bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
// solhint-disable-next-line no-inline-assembly
assembly { codehash := extcodehash(account) }
return (codehash != accountHash && codehash != 0x0);
}
function sendValue(address payable recipient, uint256 amount) internal {
require(address(this).balance >= amount, "Address: insufficient balance");
// solhint-disable-next-line avoid-low-level-calls, avoid-call-value
(bool success, ) = recipient.call{ value: amount }("");
require(success, "Address: unable to send value, recipient may have reverted");
}
function functionCall(address target, bytes memory data) internal returns (bytes memory) {
return functionCall(target, data, "Address: low-level call failed");
}
function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
return _functionCallWithValue(target, data, 0, errorMessage);
}
function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
}
function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
require(address(this).balance >= value, "Address: insufficient balance for call");
return _functionCallWithValue(target, data, value, errorMessage);
}
function _functionCallWithValue(address target, bytes memory data, uint256 weiValue, string memory errorMessage) private returns (bytes memory) {
require(isContract(target), "Address: call to non-contract");
// solhint-disable-next-line avoid-low-level-calls
(bool success, bytes memory returndata) = target.call{ value: weiValue }(data);
if (success) {
return returndata;
} else {
// Look for revert reason and bubble it up if present
if (returndata.length > 0) {
// The easiest way to bubble the revert reason is using memory via assembly
// solhint-disable-next-line no-inline-assembly
assembly {
let returndata_size := mload(returndata)
revert(add(32, returndata), returndata_size)
}
} else {
revert(errorMessage);
}
}
}
}
abstract contract Context {
function _msgSender() internal view returns (address payable) {
return payable(msg.sender);
}
function _msgData() internal view returns (bytes memory) {
this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
return msg.data;
}
}
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) {
// Solidity only automatically asserts when dividing by 0
require(b > 0, errorMessage);
uint256 c = a / b;
// assert(a == b * c + a % b); // There is no case in which this doesn't hold
return c;
}
}
interface IERC20 {
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 `recipient`.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transfer(address recipient, 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.
*/
// K8u#El(o)nG3a#t!e c&oP0Y
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 `sender` to `recipient` 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 sender, address recipient, uint256 amount) external returns (bool);
/**
* @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);
}
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 () {
address msgSender = _msgSender();
_owner = msgSender;
emit OwnershipTransferred(address(0), msgSender);
}
/**
* @dev Returns the address of the current owner.
*/
function owner() public view returns (address) {
return _owner;
}
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
require(_owner == _msgSender(), "Ownable: caller is not the owner");
_;
}
/**
* @dev Leaves the contract without owner. It will not be possible to call
* `onlyOwner` functions anymore. Can only be called by the current owner.
*
* NOTE: Renouncing ownership will leave the contract without an owner,
* thereby removing any functionality that is only available to the owner.
*/
function renounceOwnership() public virtual onlyOwner {
emit OwnershipTransferred(_owner, address(0));
_owner = 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");
emit OwnershipTransferred(_owner, newOwner);
_owner = newOwner;
}
}
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 addLiquidity(
address tokenA,
address tokenB,
uint amountADesired,
uint amountBDesired,
uint amountAMin,
uint amountBMin,
address to,
uint deadline
) external returns (uint amountA, uint amountB, uint liquidity);
function addLiquidityETH(
address token,
uint amountTokenDesired,
uint amountTokenMin,
uint amountETHMin,
address to,
uint deadline
) external payable returns (uint amountToken, uint amountETH, uint liquidity);
function swapExactTokensForTokensSupportingFeeOnTransferTokens(
uint amountIn,
uint amountOutMin,
address[] calldata path,
address to,
uint deadline
) external;
function swapExactETHForTokensSupportingFeeOnTransferTokens(
uint amountOutMin,
address[] calldata path,
address to,
uint deadline
) external payable;
function swapExactTokensForETHSupportingFeeOnTransferTokens(
uint amountIn,
uint amountOutMin,
address[] calldata path,
address to,
uint deadline
) external;
}
// CHANGE
contract Nexan is IERC20, Ownable {
using SafeMath for uint256;
// ERC20
string constant _name = "Nexan";
string constant _symbol = "NXAN";
uint8 constant _decimals = 18;
uint256 _totalSupply = 1000000000 * (10 ** _decimals); // 1,000,000,000
// CONSTANT ADDRESSES
address WETH = 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2;
address DEAD = 0x000000000000000000000000000000000000dEaD;
address ZERO = 0x0000000000000000000000000000000000000000;
address ROUTER = 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D;
IDEXRouter public router = IDEXRouter(ROUTER);
// LIMITTER
uint256 public _maxBuyTxAmount = (_totalSupply * 10) / 1000; // 1%
uint256 public _maxSellTxAmount = (_totalSupply * 10) / 1000; // 1%
uint256 public _maxWalletSize = (_totalSupply * 20) / 1000; // 2%
mapping (address => uint256) _balances;
mapping (address => mapping (address => uint256)) _allowances;
mapping (address => bool) isFeeExempt;
mapping (address => bool) isTxLimitExempt;
// FEES
uint256 treasuryFee = 50;
uint256 devFee = 200;
uint256 mktFee = 150;
uint256 totalFee = 400;
uint256 feeDenominator = 10000;
// declare variables
address public devFeeReceiver;
address public mktFeeReceiver;
address public treasuryFeeReceiver;
bool public swapBackEnabled = true;
address public pair;
uint256 public swapThreshold = _totalSupply / 2000; // 0.05%
bool inSwap;
modifier swapping() { inSwap = true; _; inSwap = false; }
constructor () {
pair = IDEXFactory(router.factory()).createPair(WETH, address(this));
// addresses
devFeeReceiver = address(0xB98B0322f0443adF8F2Fb2bB015bB001CE631BA6);
mktFeeReceiver = address(0x33277B5BdDd86786b3828256743Cd2043038E1C4);
treasuryFeeReceiver = address(0xaD0fCE7813EB24AfEd0810A3Fbc8efEFC8CADdFD);
_allowances[address(this)][address(router)] = type(uint256).max;
isFeeExempt[msg.sender] = true;
isFeeExempt[devFeeReceiver] = true;
isFeeExempt[mktFeeReceiver] = true;
isFeeExempt[treasuryFeeReceiver] = true;
isFeeExempt[address(this)] = true;
isTxLimitExempt[msg.sender] = true;
isTxLimitExempt[devFeeReceiver] = true;
isTxLimitExempt[mktFeeReceiver] = true;
isTxLimitExempt[treasuryFeeReceiver] = true;
isTxLimitExempt[ZERO] = true;
isTxLimitExempt[address(this)] = true;
_balances[devFeeReceiver] = _totalSupply.mul(5).div(100);
_balances[treasuryFeeReceiver] = _totalSupply.mul(15).div(100);
_balances[msg.sender] = _totalSupply.mul(80).div(100);
}
receive() external payable { }
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); }
// coniditional Boolean
bool isTxExempted = (isTxLimitExempt[sender] || isTxLimitExempt[recipient]);
bool isContractTransfer = (sender==address(this) || recipient==address(this));
bool isLiquidityTransfer = ((sender == pair && recipient == address(router)) || (recipient == pair && sender == address(router) ));
if(!isTxExempted && !isContractTransfer && !isLiquidityTransfer ){
txLimitter(sender,recipient, amount);
}
if (recipient != pair && recipient != DEAD) {
require(isTxLimitExempt[recipient] || _balances[recipient] + amount <= _maxWalletSize, "Transfer amount exceeds the wallet size.");
}
if(shouldSwapBack()){ swapBack(); }
uint256 amountReceived = shouldTakeFee(sender,recipient) ? takeFee(sender, amount) : amount;
_balances[sender] = _balances[sender].sub(amount, "Insufficient Balance");
_balances[recipient] = _balances[recipient].add(amountReceived);
emit Transfer(sender, recipient, amountReceived);
return true;
}
function _basicTransfer(address sender, address recipient, uint256 amount) internal returns (bool) {
_balances[sender] = _balances[sender].sub(amount, "Insufficient Balance");
_balances[recipient] = _balances[recipient].add(amount);
emit Transfer(sender, recipient, amount);
return true;
}
function txLimitter(address sender, address recipient, uint256 amount) internal view {
bool isBuy = sender == pair || sender == address(router);
bool isSell = recipient== pair || recipient == address(router);
if(isBuy){
require(amount <= _maxBuyTxAmount, "TX Limit Exceeded");
}
if(isSell){
require(amount <= _maxSellTxAmount, "TX Limit Exceeded");
}
}
function shouldTakeFee(address sender, address recipient) internal view returns (bool) {
return (sender == pair || recipient == pair) && !isFeeExempt[sender] && !isFeeExempt[recipient] ;
}
function getTotalFee() public view returns (uint256) {
return totalFee;
}
function takeFee(address sender, uint256 amount) internal returns (uint256) {
uint256 feeAmount = amount.mul(getTotalFee()).div(feeDenominator);
_balances[address(this)] = _balances[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
&& swapBackEnabled
&& _balances[address(this)] >= swapThreshold;
}
function swapBack() internal swapping {
uint256 amountToSwap = swapThreshold;
address[] memory path = new address[](2);
path[0] = address(this);
path[1] = WETH;
uint256 balanceBefore = address(this).balance;
router.swapExactTokensForETHSupportingFeeOnTransferTokens(
amountToSwap,
0,
path,
address(this),
block.timestamp
);
uint256 amountWETH = address(this).balance.sub(balanceBefore);
uint256 totalWETHFee = totalFee;
uint256 amountWETHDev = amountWETH.mul(devFee).div(totalWETHFee);
uint256 amountWETHMkt = amountWETH.mul(mktFee).div(totalWETHFee);
uint256 amountWETHTreasury = amountWETH.mul(treasuryFee).div(totalWETHFee);
sendPayable(amountWETHDev, amountWETHMkt, amountWETHTreasury);
}
function sendPayable(uint256 amtDev, uint256 amtMkt, uint256 amtTreasury) internal {
(bool successone,) = payable(devFeeReceiver).call{value: amtDev, gas: 30000}("");
(bool successtwo,) = payable(mktFeeReceiver).call{value: amtMkt, gas: 30000}("");
(bool successthree,) = payable(treasuryFeeReceiver).call{value: amtTreasury, gas: 30000}("");
require(successone && successtwo && successthree, "receiver rejected ETH transfer");
}
// used for collecting collected Tax to DevFee Address
function withdrawCollectedTax() external onlyOwner {
uint256 bal = address(this).balance; // return the native token ( WETH )
(bool success,) = payable(devFeeReceiver).call{value: bal, gas: 30000}("");
require(success, "receiver rejected ETH transfer");
}
/**
*
* SETTER SECTIONS
*
*/
function setMaxWallet(uint256 numerator, uint256 divisor) external onlyOwner{
require(numerator > 0 && divisor > 0 && divisor <= 10000);
_maxWalletSize = _totalSupply.mul(numerator).div(divisor);
}
function setDevFee(uint256 fee) external onlyOwner {
// total fee should not be more than 4%;
uint256 simulatedFee = fee.add(treasuryFee).add(mktFee);
require(simulatedFee <= 400, "Fees too high !!");
devFee = fee;
totalFee = simulatedFee;
}
function setTreasuryFee(uint256 fee) external onlyOwner {
// total fee should not be more than 4%;
uint256 simulatedFee = fee.add(devFee).add(mktFee);
require(simulatedFee <= 400, "Fees too high !!");
treasuryFee = fee;
totalFee = simulatedFee;
}
function setMarketingFee(uint256 fee) external onlyOwner {
// total fee should not be more than 4%;
uint256 simulatedFee = fee.add(devFee).add(treasuryFee);
require(simulatedFee <= 400, "Fees too high !!");
mktFee = fee;
totalFee = simulatedFee;
}
function setBuyTxMaximum(uint256 max) external onlyOwner{
uint256 minimumTreshold = (_totalSupply * 5) / 1000; // 0.5% is the minimum tx limit, we cant set below this
uint256 simulatedMaxTx = (_totalSupply * max) / 1000;
require(simulatedMaxTx >= minimumTreshold, "Tx Limit is too low");
_maxBuyTxAmount = simulatedMaxTx;
}
function setSellTxMaximum(uint256 max) external onlyOwner {
uint256 minimumTreshold = (_totalSupply * 5) / 1000; // 0.5% is the minimum tx limit, we cant set below this
uint256 simulatedMaxTx = (_totalSupply * max) / 1000;
require(simulatedMaxTx >= minimumTreshold, "Tx Limit is too low");
_maxSellTxAmount = simulatedMaxTx;
}
function setIsFeeExempt(address holder, bool exempt) external onlyOwner {
isFeeExempt[holder] = exempt;
}
function setIsTxLimitExempt(address holder, bool exempt) external onlyOwner {
isTxLimitExempt[holder] = exempt;
}
function setFeeReceivers(address _devFeeReceiver, address _mktFeeReceiver, address _treasuryFeeReceiver) external onlyOwner {
devFeeReceiver = _devFeeReceiver;
mktFeeReceiver = _mktFeeReceiver;
treasuryFeeReceiver = _treasuryFeeReceiver;
}
function setSwapBackSettings(bool _enabled, uint256 _amount) external onlyOwner {
swapBackEnabled = _enabled;
swapThreshold = _amount;
}
function getCirculatingSupply() public view returns (uint256) {
return _totalSupply.sub(balanceOf(DEAD)).sub(balanceOf(ZERO));
}
function totalSupply() external view override returns (uint256) { return _totalSupply; }
function decimals() external pure returns (uint8) { return _decimals; }
function symbol() external pure returns (string memory) { return _symbol; }
function name() external pure returns (string memory) { return _name; }
function getOwner() external view returns (address) { return owner(); }
function balanceOf(address account) public view override returns (uint256) { return _balances[account]; }
function allowance(address holder, address spender) external view override returns (uint256) { return _allowances[holder][spender]; }
}