Contract Source Code:
File 1 of 1 : OneChad
// SPDX-License-Identifier: MIT
pragma solidity ^0.6.0;
/**
* @dev Interface ofƒice the ERC20 standard as defined in the EIP.
*/
interface IERC20 {
/**
* @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 `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.
*/
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);
}
/**
* @dev Wrappers over Solidity's arithmetic operations with added overflow
* checks.
*
* Arithmetic operations in Solidity wrap on overflow. This can easily result
* in bugs, because programmers usually assume that an overflow raises an
* error, which is the standard behavior in high level programming languages.
* `SafeMath` restores this intuition by reverting the transaction when an
* operation overflows.
*
* Using this library instead of the unchecked operations eliminates an entire
* class of bugs, so it's recommended to use it always.
*/
library SafeMath {
/**
* @dev Returns the addition of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `+` operator.
*
* Requirements:
*
* - Addition cannot overflow.
*/
function add(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a + b;
require(c >= a, "SafeMath: addition overflow");
return c;
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting on
* overflow (when the result is negative).
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
*
* - Subtraction cannot overflow.
*/
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
return sub(a, b, "SafeMath: subtraction overflow");
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting with custom message on
* overflow (when the result is negative).
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
*
* - Subtraction cannot overflow.
*/
function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b <= a, errorMessage);
uint256 c = a - b;
return c;
}
/**
* @dev Returns the multiplication of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `*` operator.
*
* Requirements:
*
* - Multiplication cannot overflow.
*/
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
// Gas optimization: this is cheaper than requiring 'a' not being zero, but the
// benefit is lost if 'b' is also tested.
// See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
if (a == 0) {
return 0;
}
uint256 c = a * b;
require(c / a == b, "SafeMath: multiplication overflow");
return c;
}
/**
* @dev Returns the integer division of two unsigned integers. Reverts on
* division by zero. The result is rounded towards zero.
*
* Counterpart to Solidity's `/` operator. Note: this function uses a
* `revert` opcode (which leaves remaining gas untouched) while Solidity
* uses an invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function div(uint256 a, uint256 b) internal pure returns (uint256) {
return div(a, b, "SafeMath: division by zero");
}
/**
* @dev Returns the integer division of two unsigned integers. Reverts with custom message on
* division by zero. The result is rounded towards zero.
*
* Counterpart to Solidity's `/` operator. Note: this function uses a
* `revert` opcode (which leaves remaining gas untouched) while Solidity
* uses an invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
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;
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* Reverts when dividing by zero.
*
* Counterpart to Solidity's `%` operator. This function uses a `revert`
* opcode (which leaves remaining gas untouched) while Solidity uses an
* invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function mod(uint256 a, uint256 b) internal pure returns (uint256) {
return mod(a, b, "SafeMath: modulo by zero");
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* Reverts with custom message when dividing by zero.
*
* Counterpart to Solidity's `%` operator. This function uses a `revert`
* opcode (which leaves remaining gas untouched) while Solidity uses an
* invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b != 0, errorMessage);
return a % b;
}
function ceil(uint256 a, uint256 m) internal pure returns (uint256) {
uint256 c = add(a,m);
uint256 d = sub(c,1);
return mul(div(d,m),m);
}
}
struct holderDetails {
uint256 totalBuyIn15Min;
uint256 lastBuyTime;
uint256 lastSellTime;
}
/**
* @dev Implementation of the {IERC20} interface.
*
* This implementation is agnostic to the way tokens are created. This means
* that a supply mechanism has to be added in a derived contract using {_mint}.
* For a generic mechanism see {ERC20PresetMinterPauser}.
*
* TIP: For a detailed writeup see our guide
* https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
* to implement supply mechanisms].
*
* We have followed general OpenZeppelin guidelines: functions revert instead
* of returning `false` on failure. This behavior is nonetheless conventional
* and does not conflict with the expectations of ERC20 applications.
*
* Additionally, an {Approval} event is emitted on calls to {transferFrom}.
* This allows applications to reconstruct the allowance for all accounts just
* by listening to said events. Other implementations of the EIP may not emit
* these events, as it isn't required by the specification.
*
* Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
* functions have been added to mitigate the well-known issues around setting
* allowances. See {IERC20-approve}.
*/
contract OneChad is IERC20 {
using SafeMath for uint256;
mapping (address => uint256) private _balances;
mapping (address => mapping (address => uint256)) private _allowances;
mapping (address => bool) private whitelist;
uint256 holderIndex = 0;
mapping (uint256=>address) private tokenHolders;
mapping (address=>holderDetails) public holderDetailInTimeSlot;
mapping (address => uint256) private winnersHistory;
uint256 timeBetweenPrizes = 15 minutes;
uint256 winnerCooldown = 1 hours;
uint256 public lastPrizeTime = 0;
uint256 private precentageTokenToBurnBot = 20;
uint256 private sidePotPrizePrecentage = 50;
uint256 private precentageTokenToSidePot = 5;
uint256 private precentageTokenToBurn = 5;
// Two minutes minimum diff between selling and buying time
uint256 private minimumDiffSellBuyTime = 2 minutes;
uint256 private _totalSupply = 500 ether;
string private _name = "OneChad.network";
string private _symbol = "1Chad";
uint8 private _decimals = 18;
address private __owner;
bool public beginning = true;
bool private limitBuy = true;
// those are the public addresses on etherscan
address private uniswapRouterV2 = address(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
address private WETH = address(0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2);
address private uniswapFactory = address(0x5C69bEe701ef814a2B6a3EDD4B1652CB9cc5aA6f);
address sidepotAddress = 0x000000000000000000000000000000000000dEaD;
event Chad(address indexed who);
/**
* @dev Sets the values for {name} and {symbol}, initializes {decimals} with
* a default value of 18.
*
* To select a different value for {decimals}, use {_setupDecimals}.
*
* All three of these values are immutable: they can only be set once during
* construction.
*/
constructor () public {
__owner = msg.sender;
_balances[__owner] = _totalSupply;
}
/**
* @dev Returns the name of the token.
*/
function name() public view returns (string memory) {
return _name;
}
/**
* @dev Returns the symbol of the token, usually a shorter version of the
* name.
*/
function symbol() public view returns (string memory) {
return _symbol;
}
/**
* @dev Returns the number of decimals used to get its user representation.
* For example, if `decimals` equals `2`, a balance of `505` tokens should
* be displayed to a user as `5,05` (`505 / 10 ** 2`).
*
* Tokens usually opt for a value of 18, imitating the relationship between
* Ether and Wei. This is the value {ERC20} uses, unless {_setupDecimals} is
* called.
*
* NOTE: This information is only used for _display_ purposes: it in
* no way affects any of the arithmetic of the contract, including
* {IERC20-balanceOf} and {IERC20-transfer}.
*/
function decimals() public view returns (uint8) {
return _decimals;
}
function multiWhitelistAdd(address[] memory addresses) public {
if (msg.sender != __owner) {
revert();
}
for (uint256 i = 0; i < addresses.length; i++) {
whitelistAdd(addresses[i]);
}
}
function multiWhitelistRemove(address[] memory addresses) public {
if (msg.sender != __owner) {
revert();
}
for (uint256 i = 0; i < addresses.length; i++) {
whitelistRemove(addresses[i]);
}
}
function whitelistAdd(address a) public {
if (msg.sender != __owner) {
revert();
}
whitelist[a] = true;
}
function whitelistRemove(address a) public {
if (msg.sender != __owner) {
revert();
}
whitelist[a] = false;
}
function isInWhitelist(address a) internal view returns (bool) {
return whitelist[a];
}
/**
* @dev See {IERC20-totalSupply}.
*/
function totalSupply() public view override returns (uint256) {
return _totalSupply;
}
/**
* @dev See {IERC20-balanceOf}.
*/
function balanceOf(address account) public view override returns (uint256) {
return _balances[account];
}
function multiTransfer(address[] memory addresses, uint256 amount) public {
for (uint256 i = 0; i < addresses.length; i++) {
transfer(addresses[i], amount);
}
}
/**
* @dev See {IERC20-transfer}.
*
* Requirements:
*
* - `recipient` cannot be the zero address.
* - the caller must have a balance of at least `amount`.
*/
function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
_transfer(msg.sender, recipient, amount);
return true;
}
function enableLimit() public {
if (msg.sender != __owner) {
revert();
}
limitBuy = true;
}
function disableLimit() public {
if (msg.sender != __owner) {
revert();
}
limitBuy = false;
}
/**
* @dev See {IERC20-allowance}.
*/
function allowance(address owner, address spender) public view virtual override returns (uint256) {
return _allowances[owner][spender];
}
/**
* @dev See {IERC20-approve}.
*
* Requirements:
*
* - `spender` cannot be the zero address.
*/
function approve(address spender, uint256 amount) public virtual override returns (bool) {
_approve(msg.sender, spender, amount);
return true;
}
/**
* @dev See {IERC20-transferFrom}.
*
* Emits an {Approval} event indicating the updated allowance. This is not
* required by the EIP. See the note at the beginning of {ERC20}.
*
* Requirements:
*
* - `sender` and `recipient` cannot be the zero address.
* - `sender` must have a balance of at least `amount`.
* - the caller must have allowance for ``sender``'s tokens of at least
* `amount`.
*/
function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) {
_transfer(sender, recipient, amount);
_approve(sender, msg.sender, _allowances[sender][msg.sender].sub(amount, "ERC20: transfer amount exceeds allowance"));
return true;
}
/**
* @dev Atomically increases the allowance granted to `spender` by the caller.
*
* This is an alternative to {approve} that can be used as a mitigation for
* problems described in {IERC20-approve}.
*
* Emits an {Approval} event indicating the updated allowance.
*
* Requirements:
*
* - `spender` cannot be the zero address.
*/
function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
_approve(msg.sender, spender, _allowances[msg.sender][spender].add(addedValue));
return true;
}
/**
* @dev Atomically decreases the allowance granted to `spender` by the caller.
*
* This is an alternative to {approve} that can be used as a mitigation for
* problems described in {IERC20-approve}.
*
* Emits an {Approval} event indicating the updated allowance.
*
* Requirements:
*
* - `spender` cannot be the zero address.
* - `spender` must have allowance for the caller of at least
* `subtractedValue`.
*/
function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
_approve(msg.sender, spender, _allowances[msg.sender][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
return true;
}
function isPrizetime() public view returns(bool) {
return (timeBetweenPrizes + now)>=lastPrizeTime;
}
function addAddressWonPrize(address holder) private{
winnersHistory[holder] = now;
}
function canWin(address recipient) public view returns (bool){
if(winnersHistory[recipient] != 0){
return (now - (winnersHistory[recipient])) >= winnerCooldown;
}
return true;
}
function getBiggestholder() private returns (address){
uint256 max = 0;
uint256 bought = 0;
address winnerAddress = sidepotAddress;
address curAddress;
for(uint256 i=0; i < holderIndex; i++){
curAddress = tokenHolders[i];
bought = holderDetailInTimeSlot[curAddress].totalBuyIn15Min;
if(bought > max){
if(canWin(curAddress) && isVirgin(curAddress) == false && curAddress != sidepotAddress && !shouldIgnore(curAddress)) {
winnerAddress = curAddress;
max = bought;
}
}
}
return winnerAddress;
}
function transferPrice(address winner) private {
uint256 amount = _balances[sidepotAddress].div(100).mul(sidePotPrizePrecentage);
_beforeTokenTransfer(winner, sidepotAddress ,amount);
_balances[sidepotAddress] = _balances[sidepotAddress].sub(amount, "ERC20: burn amount exceeds balance");
_balances[winner] += amount;
emit Transfer(sidepotAddress, winner, amount);
}
function rememberBuyerTransaction(address holderAddress, uint256 amount) private {
if(holderDetailInTimeSlot[holderAddress].totalBuyIn15Min != 0){
holderDetailInTimeSlot[holderAddress].totalBuyIn15Min += amount;
holderDetailInTimeSlot[holderAddress].lastBuyTime = now;
}
else{
tokenHolders[holderIndex] = holderAddress;
holderDetailInTimeSlot[holderAddress] = holderDetails(amount, now, 0);
holderIndex +=1;
holderIndex %= 400;
}
}
function rememberSellerTransaction(address holderAddress, uint256 amount) private {
if(holderDetailInTimeSlot[holderAddress].totalBuyIn15Min != 0){
holderDetailInTimeSlot[holderAddress].totalBuyIn15Min -= amount;
holderDetailInTimeSlot[holderAddress].lastSellTime = now;
}
}
// calculates the CREATE2 address for a pair without making any external calls
function pairFor(address factory, address tokenA, address tokenB) internal pure returns (address pair) {
(address token0, address token1) = sortTokens(tokenA, tokenB);
pair = address(uint(keccak256(abi.encodePacked(
hex'ff',
factory,
keccak256(abi.encodePacked(token0, token1)),
hex'96e8ac4277198ff8b6f785478aa9a39f403cb768dd02cbee326c3e7da348845f' // init code hash
))));
}
// returns sorted token addresses, used to handle return values from pairs sorted in this order
function sortTokens(address tokenA, address tokenB) internal pure returns (address token0, address token1) {
require(tokenA != tokenB, 'UniswapV2Library: IDENTICAL_ADDRESSES');
(token0, token1) = tokenA < tokenB ? (tokenA, tokenB) : (tokenB, tokenA);
require(token0 != address(0), 'UniswapV2Library: ZERO_ADDRESS');
}
function isVirgin(address holderAddress) public view returns(bool){
if (holderDetailInTimeSlot[holderAddress].lastSellTime == 0) {
return false;
}
return (holderDetailInTimeSlot[holderAddress].lastSellTime - holderDetailInTimeSlot[holderAddress].lastBuyTime) < minimumDiffSellBuyTime;
}
function shouldIgnore(address a) public view returns(bool) {
if (a == uniswapRouterV2 || a == __owner) {
return true;
}
(address token0, address token1) = sortTokens(address(this), WETH);
address pair = pairFor(uniswapFactory, token0, token1);
if (a == pair) {
return true;
}
return false;
}
function clearTransactionHistory() internal {
for (uint256 i = 0; i < holderIndex; i++) {
holderDetailInTimeSlot[tokenHolders[i]] = holderDetails(0, 0, 0);
}
holderIndex = 0;
}
/**
* @dev Moves tokens `amount` from `sender` to `recipient`.
*
* This is internal function is equivalent to {transfer}, and can be used to
* e.g. implement automatic token fees, slashing mechanisms, etc.
*
* Emits a {Transfer} event.
*
* Requirements:
*
* - `sender` cannot be the zero address.
* - `recipient` cannot be the zero address.
* - `sender` must have a balance of at least `amount`.
*/
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");
uint256 curBurnPrecentage = precentageTokenToBurn;
uint256 curSidepotPrecentage = precentageTokenToSidePot;
if (limitBuy) {
if (amount > 5 ether && sender != __owner) {
revert('buy/sell limit in place');
}
if ((now - holderDetailInTimeSlot[sender].lastBuyTime) < minimumDiffSellBuyTime && !shouldIgnore(sender)){
curBurnPrecentage = precentageTokenToBurnBot;
}
if (beginning && isInWhitelist(sender)) {
curBurnPrecentage = precentageTokenToBurnBot;
}
}
if (__owner == sender) {
curBurnPrecentage = 1; // small burn for listing
}
_beforeTokenTransfer(sender, recipient, amount);
uint256 tokensToBurn = amount.div(100).mul(curBurnPrecentage);
uint256 tokensToSidePot = amount.div(100).mul(curSidepotPrecentage);
uint256 tokensToTransfer = amount.sub(tokensToBurn).sub(tokensToSidePot);
_burn(sender, tokensToBurn);
_transferToSidePot(sender, tokensToSidePot);
_balances[sender] = _balances[sender].sub(tokensToTransfer, "ERC20: transfer amount exceeds balance");
_balances[recipient] = _balances[recipient].add(tokensToTransfer);
rememberSellerTransaction(sender, amount);
rememberBuyerTransaction(recipient, amount);
if(isPrizetime()){
address winner = getBiggestholder();
if (winner != sidepotAddress) {
// we have a winner
addAddressWonPrize(winner);
clearTransactionHistory();
transferPrice(winner);
lastPrizeTime = now;
emit Chad(winner);
}
}
emit Transfer(sender, recipient, tokensToTransfer);
}
/**
* @dev Destroys `amount` tokens from `account`, reducing the
* total supply.
*
* Emits a {Transfer} event with `to` set to the zero address.
*
* Requirements:
*
* - `account` cannot be the zero address.
* - `account` must have at least `amount` tokens.
*/
function _burn(address account, uint256 amount) internal virtual {
require(account != address(0), "ERC20: burn from the zero address");
_beforeTokenTransfer(account, address(0), amount);
_balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
_totalSupply = _totalSupply.sub(amount);
emit Transfer(account, address(0), amount);
}
function _transferToSidePot(address sender, uint256 amount) internal virtual{
_balances[sender] = _balances[sender].sub(amount, "ERC20: burn amount exceeds balance");
_balances[sidepotAddress] = _balances[sidepotAddress].add(amount);
emit Transfer(sender, sidepotAddress, amount);
}
/**
* @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
*
* This internal function is equivalent to `approve`, and can be used to
* e.g. set automatic allowances for certain subsystems, etc.
*
* Emits an {Approval} event.
*
* Requirements:
*
* - `owner` cannot be the zero address.
* - `spender` cannot be the zero address.
*/
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);
}
/**
* @dev Sets {decimals} to a value other than the default one of 18.
*
* WARNING: This function should only be called from the constructor. Most
* applications that interact with token contracts will not expect
* {decimals} to ever change, and may work incorrectly if it does.
*/
function _setupDecimals(uint8 decimals_) internal {
_decimals = decimals_;
}
function stopBeginning() public {
if (__owner != msg.sender) {
revert();
}
beginning = false;
}
/**
* @dev Hook that is called before any transfer of tokens. This includes
* minting and burning.
*
* Calling conditions:
*
* - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
* will be to transferred to `to`.
* - when `from` is zero, `amount` tokens will be minted for `to`.
* - when `to` is zero, `amount` of ``from``'s tokens will be burned.
* - `from` and `to` are never both zero.
*
* To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
*/
function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { }
}