Contract Source Code:
/*
https://00a86b.com/
https://twitter.com/OOA86B
https://t.me/OOA86B
*/
// SPDX-License-Identifier: No License
pragma solidity 0.8.19;
import "./ERC20.sol";
import "./ERC20Burnable.sol";
import "./Ownable.sol";
import "./CoinDividendTracker.sol";
import "./Initializable.sol";
import "./IUniswapV2Factory.sol";
import "./IUniswapV2Pair.sol";
import "./IUniswapV2Router01.sol";
import "./IUniswapV2Router02.sol";
contract Token is ERC20, ERC20Burnable, Ownable, DividendTrackerFunctions, Initializable {
uint256 public swapThreshold;
uint256 private _marketingPending;
uint256 private _liquidityPending;
uint256 private _rewardsPending;
address public marketingAddress;
uint16[3] public marketingFees;
address public lpTokensReceiver;
uint16[3] public liquidityFees;
uint16[3] public rewardsFees;
mapping (address => bool) public isExcludedFromFees;
uint16[3] public totalFees;
bool private _swapping;
IUniswapV2Router02 public routerV2;
address public pairV2;
mapping (address => bool) public AMMPairs;
mapping (address => bool) public isExcludedFromLimits;
uint256 public maxWalletAmount;
event SwapThresholdUpdated(uint256 swapThreshold);
event marketingAddressUpdated(address marketingAddress);
event marketingFeesUpdated(uint16 buyFee, uint16 sellFee, uint16 transferFee);
event marketingFeeSent(address recipient, uint256 amount);
event LpTokensReceiverUpdated(address lpTokensReceiver);
event liquidityFeesUpdated(uint16 buyFee, uint16 sellFee, uint16 transferFee);
event liquidityAdded(uint amountToken, uint amountCoin, uint liquidity);
event ForceLiquidityAdded(uint256 leftoverTokens, uint256 unaddedTokens);
event rewardsFeesUpdated(uint16 buyFee, uint16 sellFee, uint16 transferFee);
event rewardsFeeSent(uint256 amount);
event ExcludeFromFees(address indexed account, bool isExcluded);
event RouterV2Updated(address indexed routerV2);
event AMMPairsUpdated(address indexed AMMPair, bool isPair);
event ExcludeFromLimits(address indexed account, bool isExcluded);
event MaxWalletAmountUpdated(uint256 maxWalletAmount);
constructor()
ERC20(unicode"#00A86B", unicode"#00A86B")
{
address supplyRecipient = 0x14DcBdd69b60EDBC0A9A84879491f328cF662d9c;
updateSwapThreshold(3948948949 * (10 ** decimals()) / 10);
marketingAddressSetup(0x14DcBdd69b60EDBC0A9A84879491f328cF662d9c);
marketingFeesSetup(200, 200, 0);
lpTokensReceiverSetup(0x14DcBdd69b60EDBC0A9A84879491f328cF662d9c);
liquidityFeesSetup(100, 100, 0);
_deployDividendTracker(7200, 15795795790 * (10 ** decimals()) / 10);
gasForProcessingSetup(300000);
rewardsFeesSetup(200, 200, 0);
_excludeFromDividends(supplyRecipient, true);
_excludeFromDividends(address(this), true);
_excludeFromDividends(address(0), true);
_excludeFromDividends(address(dividendTracker), true);
excludeFromFees(supplyRecipient, true);
excludeFromFees(address(this), true);
_excludeFromLimits(supplyRecipient, true);
_excludeFromLimits(address(this), true);
_excludeFromLimits(address(0), true);
_excludeFromLimits(marketingAddress, true);
updateMaxWalletAmount(157957957950 * (10 ** decimals()) / 10);
_mint(supplyRecipient, 7897897897890 * (10 ** decimals()) / 10);
_transferOwnership(0x14DcBdd69b60EDBC0A9A84879491f328cF662d9c);
}
function initialize(address _router) initializer external {
_updateRouterV2(_router);
}
receive() external payable {}
function decimals() public pure override returns (uint8) {
return 18;
}
function _swapTokensForCoin(uint256 tokenAmount) private {
address[] memory path = new address[](2);
path[0] = address(this);
path[1] = routerV2.WETH();
_approve(address(this), address(routerV2), tokenAmount);
routerV2.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount, 0, path, address(this), block.timestamp);
}
function updateSwapThreshold(uint256 _swapThreshold) public onlyOwner {
swapThreshold = _swapThreshold;
emit SwapThresholdUpdated(_swapThreshold);
}
function getAllPending() public view returns (uint256) {
return 0 + _marketingPending + _liquidityPending + _rewardsPending;
}
function marketingAddressSetup(address _newAddress) public onlyOwner {
require(_newAddress != address(0), "TaxesDefaultRouterWallet: Wallet tax recipient cannot be a 0x0 address");
marketingAddress = _newAddress;
excludeFromFees(_newAddress, true);
emit marketingAddressUpdated(_newAddress);
}
function marketingFeesSetup(uint16 _buyFee, uint16 _sellFee, uint16 _transferFee) public onlyOwner {
totalFees[0] = totalFees[0] - marketingFees[0] + _buyFee;
totalFees[1] = totalFees[1] - marketingFees[1] + _sellFee;
totalFees[2] = totalFees[2] - marketingFees[2] + _transferFee;
require(totalFees[0] <= 2500 && totalFees[1] <= 2500 && totalFees[2] <= 2500, "TaxesDefaultRouter: Cannot exceed max total fee of 25%");
marketingFees = [_buyFee, _sellFee, _transferFee];
emit marketingFeesUpdated(_buyFee, _sellFee, _transferFee);
}
function _swapAndLiquify(uint256 tokenAmount) private returns (uint256 leftover) {
// Sub-optimal method for supplying liquidity
uint256 halfAmount = tokenAmount / 2;
uint256 otherHalf = tokenAmount - halfAmount;
_swapTokensForCoin(halfAmount);
uint256 coinBalance = address(this).balance;
if (coinBalance > 0) {
(uint amountToken, uint amountCoin, uint liquidity) = _addLiquidity(otherHalf, coinBalance);
emit liquidityAdded(amountToken, amountCoin, liquidity);
return otherHalf - amountToken;
} else {
return otherHalf;
}
}
function _addLiquidity(uint256 tokenAmount, uint256 coinAmount) private returns (uint, uint, uint) {
_approve(address(this), address(routerV2), tokenAmount);
return routerV2.addLiquidityETH{value: coinAmount}(address(this), tokenAmount, 0, 0, lpTokensReceiver, block.timestamp);
}
function addLiquidityFromLeftoverTokens() external onlyOwner {
uint256 leftoverTokens = balanceOf(address(this)) - getAllPending();
uint256 unaddedTokens = _swapAndLiquify(leftoverTokens);
emit ForceLiquidityAdded(leftoverTokens, unaddedTokens);
}
function lpTokensReceiverSetup(address _newAddress) public onlyOwner {
lpTokensReceiver = _newAddress;
emit LpTokensReceiverUpdated(_newAddress);
}
function liquidityFeesSetup(uint16 _buyFee, uint16 _sellFee, uint16 _transferFee) public onlyOwner {
totalFees[0] = totalFees[0] - liquidityFees[0] + _buyFee;
totalFees[1] = totalFees[1] - liquidityFees[1] + _sellFee;
totalFees[2] = totalFees[2] - liquidityFees[2] + _transferFee;
require(totalFees[0] <= 2500 && totalFees[1] <= 2500 && totalFees[2] <= 2500, "TaxesDefaultRouter: Cannot exceed max total fee of 25%");
liquidityFees = [_buyFee, _sellFee, _transferFee];
emit liquidityFeesUpdated(_buyFee, _sellFee, _transferFee);
}
function _sendDividends(uint256 tokenAmount) private {
_swapTokensForCoin(tokenAmount);
uint256 dividends = address(this).balance;
if (dividends > 0) {
(bool success,) = payable(address(dividendTracker)).call{value: dividends}("");
if (success) emit rewardsFeeSent(dividends);
}
}
function excludeFromDividends(address account, bool isExcluded) external onlyOwner {
_excludeFromDividends(account, isExcluded);
}
function _excludeFromDividends(address account, bool isExcluded) internal override {
dividendTracker.excludeFromDividends(account, balanceOf(account), isExcluded);
}
function rewardsFeesSetup(uint16 _buyFee, uint16 _sellFee, uint16 _transferFee) public onlyOwner {
totalFees[0] = totalFees[0] - rewardsFees[0] + _buyFee;
totalFees[1] = totalFees[1] - rewardsFees[1] + _sellFee;
totalFees[2] = totalFees[2] - rewardsFees[2] + _transferFee;
require(totalFees[0] <= 2500 && totalFees[1] <= 2500 && totalFees[2] <= 2500, "TaxesDefaultRouter: Cannot exceed max total fee of 25%");
rewardsFees = [_buyFee, _sellFee, _transferFee];
emit rewardsFeesUpdated(_buyFee, _sellFee, _transferFee);
}
function _burn(address account, uint256 amount) internal override {
super._burn(account, amount);
dividendTracker.setBalance(account, balanceOf(account));
}
function _mint(address account, uint256 amount) internal override {
super._mint(account, amount);
dividendTracker.setBalance(account, balanceOf(account));
}
function excludeFromFees(address account, bool isExcluded) public onlyOwner {
isExcludedFromFees[account] = isExcluded;
emit ExcludeFromFees(account, isExcluded);
}
function _transfer(
address from,
address to,
uint256 amount
) internal override {
bool canSwap = getAllPending() >= swapThreshold;
if (!_swapping && !AMMPairs[from] && canSwap) {
_swapping = true;
if (false || _marketingPending > 0) {
uint256 token2Swap = 0 + _marketingPending;
bool success = false;
_swapTokensForCoin(token2Swap);
uint256 coinsReceived = address(this).balance;
uint256 marketingPortion = coinsReceived * _marketingPending / token2Swap;
if (marketingPortion > 0) {
success = payable(marketingAddress).send(marketingPortion);
if (success) {
emit marketingFeeSent(marketingAddress, marketingPortion);
}
}
_marketingPending = 0;
}
if (_liquidityPending > 0) {
_swapAndLiquify(_liquidityPending);
_liquidityPending = 0;
}
if (_rewardsPending > 0 && getNumberOfDividendTokenHolders() > 0) {
_sendDividends(_rewardsPending);
_rewardsPending = 0;
}
_swapping = false;
}
if (!_swapping && amount > 0 && to != address(routerV2) && !isExcludedFromFees[from] && !isExcludedFromFees[to]) {
uint256 fees = 0;
uint8 txType = 3;
if (AMMPairs[from]) {
if (totalFees[0] > 0) txType = 0;
}
else if (AMMPairs[to]) {
if (totalFees[1] > 0) txType = 1;
}
else if (totalFees[2] > 0) txType = 2;
if (txType < 3) {
fees = amount * totalFees[txType] / 10000;
amount -= fees;
_marketingPending += fees * marketingFees[txType] / totalFees[txType];
_liquidityPending += fees * liquidityFees[txType] / totalFees[txType];
_rewardsPending += fees * rewardsFees[txType] / totalFees[txType];
}
if (fees > 0) {
super._transfer(from, address(this), fees);
}
}
super._transfer(from, to, amount);
dividendTracker.setBalance(from, balanceOf(from));
dividendTracker.setBalance(to, balanceOf(to));
if (!_swapping) try dividendTracker.process(gasForProcessing) {} catch {}
}
function _updateRouterV2(address router) private {
routerV2 = IUniswapV2Router02(router);
pairV2 = IUniswapV2Factory(routerV2.factory()).createPair(address(this), routerV2.WETH());
_excludeFromDividends(router, true);
_excludeFromLimits(router, true);
_setAMMPair(pairV2, true);
emit RouterV2Updated(router);
}
function setAMMPair(address pair, bool isPair) external onlyOwner {
require(pair != pairV2, "DefaultRouter: Cannot remove initial pair from list");
_setAMMPair(pair, isPair);
}
function _setAMMPair(address pair, bool isPair) private {
AMMPairs[pair] = isPair;
if (isPair) {
_excludeFromDividends(pair, true);
_excludeFromLimits(pair, true);
}
emit AMMPairsUpdated(pair, isPair);
}
function excludeFromLimits(address account, bool isExcluded) external onlyOwner {
_excludeFromLimits(account, isExcluded);
}
function _excludeFromLimits(address account, bool isExcluded) internal {
isExcludedFromLimits[account] = isExcluded;
emit ExcludeFromLimits(account, isExcluded);
}
function updateMaxWalletAmount(uint256 _maxWalletAmount) public onlyOwner {
require(_maxWalletAmount >= _maxWalletSafeLimit(), "MaxWallet: Limit too low");
maxWalletAmount = _maxWalletAmount;
emit MaxWalletAmountUpdated(_maxWalletAmount);
}
function _maxWalletSafeLimit() private view returns (uint256) {
return totalSupply() / 1000;
}
function _beforeTokenTransfer(address from, address to, uint256 amount)
internal
override
{
super._beforeTokenTransfer(from, to, amount);
}
function _afterTokenTransfer(address from, address to, uint256 amount)
internal
override
{
if (!isExcludedFromLimits[to]) {
require(balanceOf(to) <= maxWalletAmount, "MaxWallet: Cannot exceed max wallet limit");
}
super._afterTokenTransfer(from, to, amount);
}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/ERC20.sol)
pragma solidity ^0.8.0;
import "./IERC20.sol";
import "./IERC20Metadata.sol";
import "./Context.sol";
/**
* @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.openzeppelin.com/t/how-to-implement-erc20-supply-mechanisms/226[How
* to implement supply mechanisms].
*
* The default value of {decimals} is 18. To change this, you should override
* this function so it returns a different value.
*
* We have followed general OpenZeppelin Contracts guidelines: functions revert
* instead 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 ERC20 is Context, IERC20, IERC20Metadata {
mapping(address => uint256) private _balances;
mapping(address => mapping(address => uint256)) private _allowances;
uint256 private _totalSupply;
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 view virtual override returns (uint8) {
return 18;
}
/**
* @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");
require(to != address(0), "ERC20: transfer to the zero address");
_beforeTokenTransfer(from, to, amount);
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);
_afterTokenTransfer(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");
_beforeTokenTransfer(address(0), account, amount);
_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);
_afterTokenTransfer(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");
_beforeTokenTransfer(account, address(0), amount);
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);
_afterTokenTransfer(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);
}
}
}
/**
* @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 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 {}
/**
* @dev Hook that is called after any transfer of tokens. This includes
* minting and burning.
*
* Calling conditions:
*
* - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
* has been transferred to `to`.
* - when `from` is zero, `amount` tokens have been minted for `to`.
* - when `to` is zero, `amount` of ``from``'s tokens have been 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 _afterTokenTransfer(address from, address to, uint256 amount) internal virtual {}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC20/extensions/ERC20Burnable.sol)
pragma solidity ^0.8.0;
import "./ERC20.sol";
import "./Context.sol";
/**
* @dev Extension of {ERC20} that allows token holders to destroy both their own
* tokens and those that they have an allowance for, in a way that can be
* recognized off-chain (via event analysis).
*/
abstract contract ERC20Burnable is Context, ERC20 {
/**
* @dev Destroys `amount` tokens from the caller.
*
* See {ERC20-_burn}.
*/
function burn(uint256 amount) public virtual {
_burn(_msgSender(), amount);
}
/**
* @dev Destroys `amount` tokens from `account`, deducting from the caller's
* allowance.
*
* See {ERC20-_burn} and {ERC20-allowance}.
*
* Requirements:
*
* - the caller must have allowance for ``accounts``'s tokens of at least
* `amount`.
*/
function burnFrom(address account, uint256 amount) public virtual {
_spendAllowance(account, _msgSender(), amount);
_burn(account, amount);
}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (access/Ownable.sol)
pragma solidity ^0.8.0;
import "./Context.sol";
/**
* @dev Contract module which provides a basic access control mechanism, where
* there is an account (an owner) that can be granted exclusive access to
* specific functions.
*
* By default, the owner account will be the one that deploys the contract. This
* can later be changed with {transferOwnership}.
*
* This module is used through inheritance. It will make available the modifier
* `onlyOwner`, which can be applied to your functions to restrict their use to
* the owner.
*/
abstract 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() {
_transferOwnership(_msgSender());
}
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
_checkOwner();
_;
}
/**
* @dev Returns the address of the current owner.
*/
function owner() public view virtual returns (address) {
return _owner;
}
/**
* @dev Throws if the sender is not the owner.
*/
function _checkOwner() internal view virtual {
require(owner() == _msgSender(), "Ownable: caller is not the owner");
}
/**
* @dev Leaves the contract without owner. It will not be possible to call
* `onlyOwner` functions. Can only be called by the current owner.
*
* NOTE: Renouncing ownership will leave the contract without an owner,
* thereby disabling any functionality that is only available to the owner.
*/
function renounceOwnership() public virtual onlyOwner {
_transferOwnership(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");
_transferOwnership(newOwner);
}
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
* Internal function without access restriction.
*/
function _transferOwnership(address newOwner) internal virtual {
address oldOwner = _owner;
_owner = newOwner;
emit OwnershipTransferred(oldOwner, newOwner);
}
}
// SPDX-License-Identifier: No License
import "./ERC20.sol";
import "./Ownable.sol";
pragma solidity ^0.8.0;
library SafeMathUint {
function toInt256Safe(uint256 a) internal pure returns (int256) {
int256 b = int256(a);
require(b >= 0);
return b;
}
}
library SafeMathInt {
function toUint256Safe(int256 a) internal pure returns (uint256) {
require(a >= 0);
return uint256(a);
}
}
/// @title Dividend-Paying Token Interface
/// @author Roger Wu (https://github.com/roger-wu)
/// @dev An interface for a dividend-paying token contract.
interface DividendPayingTokenInterface {
function dividendOf(address _owner) external view returns (uint256);
event DividendsDistributed(address indexed from, uint256 weiAmount);
event DividendWithdrawn(address indexed to, uint256 weiAmount);
}
/// @title Dividend-Paying Token Optional Interface
/// @author Roger Wu (https://github.com/roger-wu)
/// @dev OPTIONAL functions for a dividend-paying token contract.
interface DividendPayingTokenOptionalInterface {
function withdrawableDividendOf(address _owner) external view returns (uint256);
function withdrawnDividendOf(address _owner) external view returns (uint256);
function accumulativeDividendOf(address _owner) external view returns (uint256);
}
/// @title Dividend-Paying Token
/// @author Roger Wu (https://github.com/roger-wu)
/// @dev A mintable ERC20 token that allows anyone to pay and distribute ether
/// to token holders as dividends and allows token holders to withdraw their dividends.
/// Reference: the source code of PoWH3D: https://etherscan.io/address/0xB3775fB83F7D12A36E0475aBdD1FCA35c091efBe#code
contract DividendPayingToken is ERC20, DividendPayingTokenInterface, DividendPayingTokenOptionalInterface {
using SafeMathUint for uint256;
using SafeMathInt for int256;
uint256 constant internal magnitude = 2**128;
uint256 internal magnifiedDividendPerShare;
mapping(address => int256) internal magnifiedDividendCorrections;
mapping(address => uint256) internal withdrawnDividends;
uint256 public totalDividendsDistributed;
constructor(string memory _name, string memory _symbol) ERC20(_name, _symbol) {}
receive() external payable {
distributeDividends();
}
function distributeDividends() public payable {
require(totalSupply() > 0);
if (msg.value > 0) {
magnifiedDividendPerShare = magnifiedDividendPerShare + (msg.value * magnitude / totalSupply());
emit DividendsDistributed(msg.sender, msg.value);
totalDividendsDistributed = totalDividendsDistributed + msg.value;
}
}
function _withdrawDividend(address account) internal returns(uint256) {
uint256 withdrawableDividend = withdrawableDividendOf(account);
if (withdrawableDividend > 0) {
withdrawnDividends[account] = withdrawnDividends[account] + withdrawableDividend;
bool success = payable(account).send(withdrawableDividend);
if (success) {
emit DividendWithdrawn(account, withdrawableDividend);
return withdrawableDividend;
} else {
withdrawnDividends[account] = withdrawnDividends[account] - withdrawableDividend;
return 0;
}
}
return 0;
}
function dividendOf(address account) public view override returns(uint256) {
return withdrawableDividendOf(account);
}
function withdrawableDividendOf(address account) public view override returns(uint256) {
return accumulativeDividendOf(account) - withdrawnDividends[account];
}
function withdrawnDividendOf(address account) public view override returns(uint256) {
return withdrawnDividends[account];
}
function accumulativeDividendOf(address account) public view override returns(uint256) {
return ((magnifiedDividendPerShare * balanceOf(account)).toInt256Safe() + magnifiedDividendCorrections[account]).toUint256Safe() / magnitude;
}
function _mint(address account, uint256 value) internal override {
super._mint(account, value);
magnifiedDividendCorrections[account] = magnifiedDividendCorrections[account] - (magnifiedDividendPerShare * value).toInt256Safe();
}
function _burn(address account, uint256 value) internal override {
super._burn(account, value);
magnifiedDividendCorrections[account] = magnifiedDividendCorrections[account] + (magnifiedDividendPerShare * value).toInt256Safe();
}
function _setBalance(address account, uint256 newBalance) internal {
uint256 currentBalance = balanceOf(account);
if(newBalance > currentBalance) _mint(account, newBalance - currentBalance);
else if(newBalance < currentBalance) _burn(account, currentBalance - newBalance);
}
}
library IterableMapping {
// Iterable mapping from address to uint;
struct Map {
address[] keys;
mapping(address => uint) values;
mapping(address => uint) indexOf;
mapping(address => bool) inserted;
}
function get(Map storage map, address key) public view returns (uint) {
return map.values[key];
}
function getIndexOfKey(Map storage map, address key) public view returns (int) {
if(!map.inserted[key]) {
return -1;
}
return int(map.indexOf[key]);
}
function getKeyAtIndex(Map storage map, uint index) public view returns (address) {
return map.keys[index];
}
function size(Map storage map) public view returns (uint) {
return map.keys.length;
}
function set(Map storage map, address key, uint val) public {
if (map.inserted[key]) {
map.values[key] = val;
} else {
map.inserted[key] = true;
map.values[key] = val;
map.indexOf[key] = map.keys.length;
map.keys.push(key);
}
}
function remove(Map storage map, address key) public {
if (!map.inserted[key]) {
return;
}
delete map.inserted[key];
delete map.values[key];
uint index = map.indexOf[key];
uint lastIndex = map.keys.length - 1;
address lastKey = map.keys[lastIndex];
map.indexOf[lastKey] = index;
delete map.indexOf[key];
map.keys[index] = lastKey;
map.keys.pop();
}
}
contract DividendTracker is Ownable, DividendPayingToken {
using IterableMapping for IterableMapping.Map;
IterableMapping.Map private tokenHoldersMap;
uint256 public lastProcessedIndex;
mapping(address => bool) public isExcludedFromDividends;
mapping(address => uint256) public lastClaimTimes;
uint256 public claimWait;
uint256 public minimumTokenBalanceForDividends;
event ExcludeFromDividends(address indexed account, bool isExcluded);
event ClaimWaitUpdated(uint256 claimWait);
event ProcessedDividendTracker(uint256 iterations, uint256 claims);
constructor(uint256 _claimWait, uint256 _minimumTokenBalance) DividendPayingToken("DividendTracker", "DividendTracker") {
claimWaitSetup(_claimWait);
minimumTokenBalanceForDividends = _minimumTokenBalance;
}
function excludeFromDividends(address account, uint256 balance, bool isExcluded) external onlyOwner {
if (isExcluded) {
require(!isExcludedFromDividends[account], "DividendTracker: This address is already excluded from dividends");
isExcludedFromDividends[account] = true;
_setBalance(account, 0);
tokenHoldersMap.remove(account);
} else {
require(isExcludedFromDividends[account], "DividendTracker: This address is already included in dividends");
isExcludedFromDividends[account] = false;
setBalance(account, balance);
}
emit ExcludeFromDividends(account, isExcluded);
}
function claimWaitSetup(uint256 newClaimWait) public onlyOwner {
require(newClaimWait >= 60 && newClaimWait <= 7 days, "DividendTracker: Claim wait time must be between 1 minute and 7 days");
claimWait = newClaimWait;
emit ClaimWaitUpdated(newClaimWait);
}
function getNumberOfTokenHolders() external view returns (uint256) {
return tokenHoldersMap.keys.length;
}
function getAccountData(address _account) public view returns (
address account,
int256 index,
int256 iterationsUntilProcessed,
uint256 withdrawableDividends,
uint256 totalDividends,
uint256 lastClaimTime,
uint256 nextClaimTime,
uint256 secondsUntilAutoClaimAvailable
)
{
account = _account;
index = tokenHoldersMap.getIndexOfKey(account);
iterationsUntilProcessed = -1;
if (index >= 0) {
if (uint256(index) > lastProcessedIndex) {
iterationsUntilProcessed = index - int256(lastProcessedIndex);
} else {
uint256 processesUntilEndOfArray = tokenHoldersMap.keys.length > lastProcessedIndex ? tokenHoldersMap.keys.length - lastProcessedIndex : 0;
iterationsUntilProcessed = index + int256(processesUntilEndOfArray);
}
}
withdrawableDividends = withdrawableDividendOf(account);
totalDividends = accumulativeDividendOf(account);
lastClaimTime = lastClaimTimes[account];
nextClaimTime = lastClaimTime > 0 ? lastClaimTime + claimWait : 0;
secondsUntilAutoClaimAvailable = nextClaimTime > block.timestamp ? nextClaimTime - block.timestamp : 0;
}
function getAccountDataAtIndex(uint256 index) public view returns (
address,
int256,
int256,
uint256,
uint256,
uint256,
uint256,
uint256
)
{
if (index >= tokenHoldersMap.size()) return (address(0), -1, -1, 0, 0, 0, 0, 0);
address account = tokenHoldersMap.getKeyAtIndex(index);
return getAccountData(account);
}
function claim(address account) public onlyOwner returns (bool) {
uint256 amount = _withdrawDividend(account);
if (amount > 0) {
lastClaimTimes[account] = block.timestamp;
return true;
}
return false;
}
function _canAutoClaim(uint256 lastClaimTime) private view returns (bool) {
if (block.timestamp < lastClaimTime) return false;
return block.timestamp - lastClaimTime >= claimWait;
}
function setBalance(address account, uint256 newBalance) public onlyOwner {
if (!isExcludedFromDividends[account]) {
if (newBalance >= minimumTokenBalanceForDividends) {
_setBalance(account, newBalance);
tokenHoldersMap.set(account, newBalance);
} else {
_setBalance(account, 0);
tokenHoldersMap.remove(account);
}
}
}
function process(uint256 gas) external onlyOwner returns(uint256 iterations, uint256 claims) {
uint256 numberOfTokenHolders = tokenHoldersMap.keys.length;
if (numberOfTokenHolders == 0) return (0, 0);
uint256 _lastProcessedIndex = lastProcessedIndex;
uint256 gasUsed = 0;
uint256 gasLeft = gasleft();
iterations = 0;
claims = 0;
while (gasUsed < gas && iterations < numberOfTokenHolders) {
_lastProcessedIndex++;
if (_lastProcessedIndex >= tokenHoldersMap.keys.length) _lastProcessedIndex = 0;
address account = tokenHoldersMap.keys[_lastProcessedIndex];
if (_canAutoClaim(lastClaimTimes[account])) {
if (claim(account)) {
claims++;
}
}
iterations++;
uint256 newGasLeft = gasleft();
if (gasLeft > newGasLeft) gasUsed = gasUsed + (gasLeft - newGasLeft);
gasLeft = newGasLeft;
}
lastProcessedIndex = _lastProcessedIndex;
emit ProcessedDividendTracker(iterations, claims);
}
}
abstract contract DividendTrackerFunctions is Ownable {
DividendTracker public dividendTracker;
uint256 public gasForProcessing;
event DeployedDividendTracker(address indexed dividendTracker);
event GasForProcessingUpdated(uint256 gasForProcessing);
function _deployDividendTracker(uint256 claimWait, uint256 minimumTokenBalance) internal {
dividendTracker = new DividendTracker(claimWait, minimumTokenBalance);
emit DeployedDividendTracker(address(dividendTracker));
}
function gasForProcessingSetup(uint256 _gasForProcessing) public onlyOwner {
require(_gasForProcessing >= 200_000 && _gasForProcessing <= 500_000, "DividendTracker: gasForProcessing must be between 200k and 500k units");
gasForProcessing = _gasForProcessing;
emit GasForProcessingUpdated(_gasForProcessing);
}
function claimWaitSetup(uint256 claimWait) external onlyOwner {
dividendTracker.claimWaitSetup(claimWait);
}
function _excludeFromDividends(address account, bool isExcluded) internal virtual;
function isExcludedFromDividends(address account) public view returns (bool) {
return dividendTracker.isExcludedFromDividends(account);
}
function claim() external returns(bool) {
return dividendTracker.claim(msg.sender);
}
function getClaimWait() external view returns (uint256) {
return dividendTracker.claimWait();
}
function getTotalDividendsDistributed() external view returns (uint256) {
return dividendTracker.totalDividendsDistributed();
}
function withdrawableDividendOf(address account) public view returns (uint256) {
return dividendTracker.withdrawableDividendOf(account);
}
function dividendTokenBalanceOf(address account) public view returns (uint256) {
return dividendTracker.balanceOf(account);
}
function dividendTokenTotalSupply() public view returns (uint256) {
return dividendTracker.totalSupply();
}
function getAccountDividendsInfo(address account) external view returns (
address,
int256,
int256,
uint256,
uint256,
uint256,
uint256,
uint256
) {
return dividendTracker.getAccountData(account);
}
function getAccountDividendsInfoAtIndex(uint256 index) external view returns (
address,
int256,
int256,
uint256,
uint256,
uint256,
uint256,
uint256
) {
return dividendTracker.getAccountDataAtIndex(index);
}
function getLastProcessedIndex() external view returns (uint256) {
return dividendTracker.lastProcessedIndex();
}
function getNumberOfDividendTokenHolders() public view returns (uint256) {
return dividendTracker.getNumberOfTokenHolders();
}
function process(uint256 gas) external returns(uint256 iterations, uint256 claims) {
return dividendTracker.process(gas);
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
/**
* @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed
* behind a proxy. Since a proxied contract can't have a constructor, it's common to move constructor logic to an
* external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer
* function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.
*
* TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as
* possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}.
*
* CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
* that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
*/
abstract contract Initializable {
/**
* @dev Indicates that the contract has been initialized.
*/
bool private _initialized;
/**
* @dev Indicates that the contract is in the process of being initialized.
*/
bool private _initializing;
/**
* @dev Modifier to protect an initializer function from being invoked twice.
*/
modifier initializer() {
require(_initializing || !_initialized, "Initializable: contract is already initialized");
bool isTopLevelCall = !_initializing;
if (isTopLevelCall) {
_initializing = true;
_initialized = true;
}
_;
if (isTopLevelCall) {
_initializing = false;
}
}
}
pragma solidity >=0.5.0;
interface IUniswapV2Factory {
event PairCreated(address indexed token0, address indexed token1, address pair, uint);
function feeTo() external view returns (address);
function feeToSetter() external view returns (address);
function getPair(address tokenA, address tokenB) external view returns (address pair);
function allPairs(uint) external view returns (address pair);
function allPairsLength() external view returns (uint);
function createPair(address tokenA, address tokenB) external returns (address pair);
function setFeeTo(address) external;
function setFeeToSetter(address) external;
}
pragma solidity >=0.5.0;
interface IUniswapV2Pair {
event Approval(address indexed owner, address indexed spender, uint value);
event Transfer(address indexed from, address indexed to, uint value);
function name() external pure returns (string memory);
function symbol() external pure returns (string memory);
function decimals() external pure returns (uint8);
function totalSupply() external view returns (uint);
function balanceOf(address owner) external view returns (uint);
function allowance(address owner, address spender) external view returns (uint);
function approve(address spender, uint value) external returns (bool);
function transfer(address to, uint value) external returns (bool);
function transferFrom(address from, address to, uint value) external returns (bool);
function DOMAIN_SEPARATOR() external view returns (bytes32);
function PERMIT_TYPEHASH() external pure returns (bytes32);
function nonces(address owner) external view returns (uint);
function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external;
event Mint(address indexed sender, uint amount0, uint amount1);
event Burn(address indexed sender, uint amount0, uint amount1, address indexed to);
event Swap(
address indexed sender,
uint amount0In,
uint amount1In,
uint amount0Out,
uint amount1Out,
address indexed to
);
event Sync(uint112 reserve0, uint112 reserve1);
function MINIMUM_LIQUIDITY() external pure returns (uint);
function factory() external view returns (address);
function token0() external view returns (address);
function token1() external view returns (address);
function getReserves() external view returns (uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast);
function price0CumulativeLast() external view returns (uint);
function price1CumulativeLast() external view returns (uint);
function kLast() external view returns (uint);
function mint(address to) external returns (uint liquidity);
function burn(address to) external returns (uint amount0, uint amount1);
function swap(uint amount0Out, uint amount1Out, address to, bytes calldata data) external;
function skim(address to) external;
function sync() external;
function initialize(address, address) external;
}
pragma solidity >=0.6.2;
interface IUniswapV2Router01 {
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 removeLiquidity(
address tokenA,
address tokenB,
uint liquidity,
uint amountAMin,
uint amountBMin,
address to,
uint deadline
) external returns (uint amountA, uint amountB);
function removeLiquidityETH(
address token,
uint liquidity,
uint amountTokenMin,
uint amountETHMin,
address to,
uint deadline
) external returns (uint amountToken, uint amountETH);
function removeLiquidityWithPermit(
address tokenA,
address tokenB,
uint liquidity,
uint amountAMin,
uint amountBMin,
address to,
uint deadline,
bool approveMax, uint8 v, bytes32 r, bytes32 s
) external returns (uint amountA, uint amountB);
function removeLiquidityETHWithPermit(
address token,
uint liquidity,
uint amountTokenMin,
uint amountETHMin,
address to,
uint deadline,
bool approveMax, uint8 v, bytes32 r, bytes32 s
) external returns (uint amountToken, uint amountETH);
function swapExactTokensForTokens(
uint amountIn,
uint amountOutMin,
address[] calldata path,
address to,
uint deadline
) external returns (uint[] memory amounts);
function swapTokensForExactTokens(
uint amountOut,
uint amountInMax,
address[] calldata path,
address to,
uint deadline
) external returns (uint[] memory amounts);
function swapExactETHForTokens(uint amountOutMin, address[] calldata path, address to, uint deadline)
external
payable
returns (uint[] memory amounts);
function swapTokensForExactETH(uint amountOut, uint amountInMax, address[] calldata path, address to, uint deadline)
external
returns (uint[] memory amounts);
function swapExactTokensForETH(uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline)
external
returns (uint[] memory amounts);
function swapETHForExactTokens(uint amountOut, address[] calldata path, address to, uint deadline)
external
payable
returns (uint[] memory amounts);
function quote(uint amountA, uint reserveA, uint reserveB) external pure returns (uint amountB);
function getAmountOut(uint amountIn, uint reserveIn, uint reserveOut) external pure returns (uint amountOut);
function getAmountIn(uint amountOut, uint reserveIn, uint reserveOut) external pure returns (uint amountIn);
function getAmountsOut(uint amountIn, address[] calldata path) external view returns (uint[] memory amounts);
function getAmountsIn(uint amountOut, address[] calldata path) external view returns (uint[] memory amounts);
}
pragma solidity >=0.6.2;
import './IUniswapV2Router01.sol';
interface IUniswapV2Router02 is IUniswapV2Router01 {
function removeLiquidityETHSupportingFeeOnTransferTokens(
address token,
uint liquidity,
uint amountTokenMin,
uint amountETHMin,
address to,
uint deadline
) external returns (uint amountETH);
function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(
address token,
uint liquidity,
uint amountTokenMin,
uint amountETHMin,
address to,
uint deadline,
bool approveMax, uint8 v, bytes32 r, bytes32 s
) external returns (uint amountETH);
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;
}
// 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;
}
}
// 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 (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);
}