Contract Source Code:
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)
pragma solidity ^0.8.0;
import "../IERC20.sol";
/**
* @dev Interface for the optional metadata functions from the ERC20 standard.
*
* _Available since v4.1._
*/
interface IERC20Metadata is IERC20 {
/**
* @dev Returns the name of the token.
*/
function name() external view returns (string memory);
/**
* @dev Returns the symbol of the token.
*/
function symbol() external view returns (string memory);
/**
* @dev Returns the decimals places of the token.
*/
function decimals() external view returns (uint8);
}
// 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 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;
}
}
pragma solidity ^0.8.17;
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol";
import "@openzeppelin/contracts/utils/Context.sol";
contract ERC20 is Context, IERC20, IERC20Metadata {
mapping(address => uint256) internal _balances;
mapping(address => mapping(address => uint256)) private _allowances;
uint256 internal _totalSupply;
uint8 internal constant _decimals = 9;
string private _name;
string private _symbol;
/**
* @dev Sets the values for {name} and {symbol}.
*
* All two of these values are immutable: they can only be set once during
* construction.
*/
constructor(string memory name_, string memory symbol_) {
_name = name_;
_symbol = symbol_;
}
/**
* @dev Returns the name of the token.
*/
function name() public view virtual override returns (string memory) {
return _name;
}
/**
* @dev Returns the symbol of the token, usually a shorter version of the
* name.
*/
function symbol() public view virtual override 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 default value returned by this function, unless
* it's overridden.
*
* 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 pure returns (uint8) {
return _decimals;
}
/**
* @dev See {IERC20-totalSupply}.
*/
function totalSupply() public view virtual override returns (uint256) {
return _totalSupply;
}
/**
* @dev See {IERC20-balanceOf}.
*/
function balanceOf(
address account
) public view virtual override returns (uint256) {
return _balances[account];
}
/**
* @dev See {IERC20-transfer}.
*
* Requirements:
*
* - `to` cannot be the zero address.
* - the caller must have a balance of at least `amount`.
*/
function transfer(
address to,
uint256 amount
) public virtual override returns (bool) {
address owner = _msgSender();
_transfer(owner, to, amount);
return true;
}
/**
* @dev See {IERC20-allowance}.
*/
function allowance(
address owner,
address spender
) public view virtual override returns (uint256) {
return _allowances[owner][spender];
}
/**
* @dev See {IERC20-approve}.
*
* NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on
* `transferFrom`. This is semantically equivalent to an infinite approval.
*
* Requirements:
*
* - `spender` cannot be the zero address.
*/
function approve(
address spender,
uint256 amount
) public virtual override returns (bool) {
address owner = _msgSender();
_approve(owner, 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}.
*
* NOTE: Does not update the allowance if the current allowance
* is the maximum `uint256`.
*
* Requirements:
*
* - `from` and `to` cannot be the zero address.
* - `from` must have a balance of at least `amount`.
* - the caller must have allowance for ``from``'s tokens of at least
* `amount`.
*/
function transferFrom(
address from,
address to,
uint256 amount
) public virtual override returns (bool) {
address spender = _msgSender();
_spendAllowance(from, spender, amount);
_transfer(from, to, amount);
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) {
address owner = _msgSender();
_approve(owner, spender, allowance(owner, spender) + 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) {
address owner = _msgSender();
uint256 currentAllowance = allowance(owner, spender);
require(
currentAllowance >= subtractedValue,
"ERC20: decreased allowance below zero"
);
unchecked {
_approve(owner, spender, currentAllowance - subtractedValue);
}
return true;
}
/**
* @dev Moves `amount` of tokens from `from` to `to`.
*
* This 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:
*
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
* - `from` must have a balance of at least `amount`.
*/
function _transfer(
address from,
address to,
uint256 amount
) internal virtual {
require(from != address(0), "ERC20: transfer from the zero address");
uint256 fromBalance = _balances[from];
require(
fromBalance >= amount,
"ERC20: transfer amount exceeds balance"
);
unchecked {
_balances[from] = fromBalance - amount;
// Overflow not possible: the sum of all balances is capped by totalSupply, and the sum is preserved by
// decrementing then incrementing.
_balances[to] += amount;
}
emit Transfer(from, to, amount);
}
/** @dev Creates `amount` tokens and assigns them to `account`, increasing
* the total supply.
*
* Emits a {Transfer} event with `from` set to the zero address.
*
* Requirements:
*
* - `account` cannot be the zero address.
*/
function _mint(address account, uint256 amount) internal virtual {
require(account != address(0), "ERC20: mint to the zero address");
_totalSupply += amount;
unchecked {
// Overflow not possible: balance + amount is at most totalSupply + amount, which is checked above.
_balances[account] += amount;
}
emit Transfer(address(0), account, amount);
}
/**
* @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");
uint256 accountBalance = _balances[account];
require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
unchecked {
_balances[account] = accountBalance - amount;
// Overflow not possible: amount <= accountBalance <= totalSupply.
_totalSupply -= amount;
}
emit Transfer(account, address(0), 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 Updates `owner` s allowance for `spender` based on spent `amount`.
*
* Does not update the allowance amount in case of infinite allowance.
* Revert if not enough allowance is available.
*
* Might emit an {Approval} event.
*/
function _spendAllowance(
address owner,
address spender,
uint256 amount
) internal virtual {
uint256 currentAllowance = allowance(owner, spender);
if (currentAllowance != type(uint256).max) {
require(
currentAllowance >= amount,
"ERC20: insufficient allowance"
);
unchecked {
_approve(owner, spender, currentAllowance - amount);
}
}
}
}
pragma solidity ^0.8.7;
interface IUniswapV2Factory {
function createPair(address tokenA, address tokenB)
external
returns (address pair);
}
pragma solidity ^0.8.7;
interface IUniswapV2Router02 {
function swapExactTokensForETH(
uint256 amountIn,
uint256 amountOutMin,
address[] calldata path,
address to,
uint256 deadline
) external;
function swapExactTokensForETHSupportingFeeOnTransferTokens(
uint256 amountIn,
uint256 amountOutMin,
address[] calldata path,
address to,
uint256 deadline
) external;
function swapETHForExactTokens(
uint256 amountOut,
address[] calldata path,
address to,
uint256 deadline
) external payable returns (uint256[] memory amounts);
function factory() external pure returns (address);
function WETH() external pure returns (address);
function addLiquidityETH(
address token,
uint256 amountTokenDesired,
uint256 amountTokenMin,
uint256 amountETHMin,
address to,
uint256 deadline
)
external
payable
returns (uint256 amountToken, uint256 amountETH, uint256 liquidity);
function swapExactETHForTokens(
uint amountOutMin,
address[] calldata path,
address to,
uint deadline
) external payable returns (uint[] memory amounts);
function getReserves(
address factory,
address tokenA,
address tokenB
) external view returns (uint reserveA, uint reserveB);
function getAmountsIn(
uint amountOut,
address[] memory path
) external view returns (uint[] memory amounts);
function getAmountsOut(
uint amountIn,
address[] memory path
) external view returns (uint[] memory amounts);
}
pragma solidity ^0.8.17;
import "./Erc20.sol";
import "./Erc20.sol";
import "./IUniswapV2Router02.sol";
import "./IUniswapV2Factory.sol";
contract Touch is ERC20 {
uint256 public constant rewardPercentMin = 10; // 1 %
uint256 public constant rewardPercentMax = 200; // 20%
uint256 public constant rewardInterwal = 180 seconds;
uint256 public constant startTotalSupply = 1e9 * (10 ** _decimals);
uint256 constant _startMaxBuyCount = startTotalSupply / 1000;
uint256 constant _addMaxBuyPercentPerSec = 5; // add 0.005%/second
IUniswapV2Router02 constant router =
IUniswapV2Router02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
bool _inSwap;
address pair;
uint256 _startTime;
bool public canReward;
uint256 public rewardVersion; // reward version
uint256 public rewardedCurrentVersion; // rewarded on current version
uint256 public rewards; // current rewards
uint256 public nextRewardTime;
uint256 public tokensOnAccounts; // tokens on all accounts
uint256 public tokensOnAccountsCurrentVerstion;
address public owner;
uint256 _nonce = 1;
mapping(address => uint256) _rewardVersionsByAccs;
event OnReward(uint256 count);
constructor() ERC20("touch", "grass") {
owner = msg.sender;
}
modifier lockTheSwap() {
_inSwap = true;
_;
_inSwap = false;
}
function _transfer(
address from,
address to,
uint256 amount
) internal override {
_updateReward(from);
_updateReward(to);
if (_inSwap) {
super._transfer(from, to, amount);
return;
}
if (to == address(0)) {
require(
_balances[from] >= amount,
"ERC20: transfer amount exceeds balance"
);
unchecked {
_balances[from] -= amount;
_totalSupply -= amount;
}
emit Transfer(from, to, amount);
return;
}
if (from == pair) {
transferFromPair(to, amount);
return;
}
if (to == pair) {
transferToPair(from, amount);
return;
}
super._transfer(from, to, amount);
}
function transferFromPair(address to, uint256 amount) private {
require(amount <= maxBuy(), "maximum buy count limit");
uint256 burnCount = (amount * 25) / 10000;
_burn(pair, burnCount);
uint256 toAccCount = amount - burnCount;
super._transfer(pair, to, toAccCount);
if (_isAccount(to)) {
tokensOnAccounts += toAccCount;
}
}
function transferToPair(address from, uint256 amount) private {
uint256 burnCount = (amount * 25) / 10000;
_burn(from, burnCount);
super._transfer(from, pair, amount - burnCount);
if (_isAccount(from)) {
tokensOnAccounts -= amount;
}
}
function burned() public view returns (uint256) {
return startTotalSupply - totalSupply();
}
function makePool() external payable lockTheSwap {
pair = IUniswapV2Factory(router.factory()).createPair(
address(this),
router.WETH()
);
_mint(address(this), startTotalSupply);
_approve(address(this), address(router), type(uint256).max);
router.addLiquidityETH{value: msg.value}(
address(this),
startTotalSupply / 2,
0,
0,
msg.sender,
block.timestamp
);
_startTime = block.timestamp;
}
function maxBuy() public view returns (uint256) {
if (pair == address(0)) return startTotalSupply;
uint256 count = _startMaxBuyCount +
(startTotalSupply *
(block.timestamp - _startTime) *
_addMaxBuyPercentPerSec) /
100000;
if (count > startTotalSupply) count = startTotalSupply;
return count;
}
function maxBuyWithoutDecimals() public view returns (uint256) {
return maxBuy() / (10 ** _decimals);
}
function _rand() private returns (uint256) {
return _nonce++ * block.timestamp * block.number;
}
function _rand(uint256 min, uint256 max) private returns (uint256) {
return min + (_rand() % (max - min + 1));
}
function balanceOf(
address account
) public view virtual override returns (uint256) {
if (account == address(this)) return _balances[account] - rewards;
return _balances[account] + getReward(account);
}
function getReward(address account) public view returns (uint256) {
if (tokensOnAccountsCurrentVerstion == 0) return 0;
if (!_isAccount(account)) return 0;
if (rewardVersion == 0) return 0;
if (_rewardVersionsByAccs[account] == rewardVersion) return 0;
return
(rewardedCurrentVersion * _balances[account]) /
tokensOnAccountsCurrentVerstion;
}
function updateReward(address account) external {
// updates account reward (for emit events)
_updateReward(account);
}
function _updateReward(address account) private {
uint256 reward = getReward(account);
_rewardVersionsByAccs[account] = rewardVersion;
if (reward == 0) return;
rewards -= reward;
_balances[address(this)] -= reward;
_balances[account] += reward;
tokensOnAccounts += reward;
emit Transfer(address(this), account, reward);
}
function _isAccount(address addr) private view returns (bool) {
return addr != address(0) && addr != pair && addr != address(this);
}
function touchGrass() external {
require(block.timestamp >= nextRewardTime, "can not grant rewards yet");
nextRewardTime = block.timestamp + rewardInterwal;
uint256 addRewards = (balanceOf(address(this)) *
_rand(rewardPercentMin, rewardPercentMax)) / 1000;
_grantRewards(addRewards);
}
function _grantRewards(uint256 count) internal {
require(canReward, "can not reward yet");
rewards += count;
rewardedCurrentVersion = rewards;
tokensOnAccountsCurrentVerstion = tokensOnAccounts;
++rewardVersion;
emit OnReward(count);
}
function startProtocolAndRenounce() external {
require(msg.sender == owner, "only owner");
owner = address(0);
canReward = true;
}
}