Contract Source Code:
File 1 of 1 : GemAI
// SPDX-License-Identifier: MIT
// File: https://github.com/OpenZeppelin/openzeppelin-contracts/blob/7f6a1666fac8ecff5dd467d0938069bc221ea9e0/contracts/utils/math/SafeMath.sol
pragma solidity ^0.8.0;
// CAUTION
// This version of SafeMath should only be used with Solidity 0.8 or later,
// because it relies on the compiler's built in overflow checks.
/**
* @dev Wrappers over Solidity's arithmetic operations.
*
* NOTE: `SafeMath` is no longer needed starting with Solidity 0.8. The compiler
* now has built in overflow checking.
*/
library SafeMath {
/**
* @dev Returns the addition of two unsigned integers, with an overflow flag.
*
* _Available since v3.4._
*/
function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
unchecked {
uint256 c = a + b;
if (c < a) return (false, 0);
return (true, c);
}
}
/**
* @dev Returns the substraction of two unsigned integers, with an overflow flag.
*
* _Available since v3.4._
*/
function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
unchecked {
if (b > a) return (false, 0);
return (true, a - b);
}
}
/**
* @dev Returns the multiplication of two unsigned integers, with an overflow flag.
*
* _Available since v3.4._
*/
function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
unchecked {
// 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 (true, 0);
uint256 c = a * b;
if (c / a != b) return (false, 0);
return (true, c);
}
}
/**
* @dev Returns the division of two unsigned integers, with a division by zero flag.
*
* _Available since v3.4._
*/
function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
unchecked {
if (b == 0) return (false, 0);
return (true, a / b);
}
}
/**
* @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
*
* _Available since v3.4._
*/
function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
unchecked {
if (b == 0) return (false, 0);
return (true, a % b);
}
}
/**
* @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) {
return a + b;
}
/**
* @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 a - b;
}
/**
* @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) {
return a * b;
}
/**
* @dev Returns the integer division of two unsigned integers, reverting on
* division by zero. The result is rounded towards zero.
*
* Counterpart to Solidity's `/` operator.
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function div(uint256 a, uint256 b) internal pure returns (uint256) {
return a / b;
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* reverting 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 a % b;
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting with custom message on
* overflow (when the result is negative).
*
* CAUTION: This function is deprecated because it requires allocating memory for the error
* message unnecessarily. For custom revert reasons use {trySub}.
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
*
* - Subtraction cannot overflow.
*/
function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
unchecked {
require(b <= a, errorMessage);
return a - b;
}
}
/**
* @dev Returns the integer division of two unsigned integers, reverting with custom message on
* division by zero. The result is rounded towards 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).
*
* 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) {
unchecked {
require(b > 0, errorMessage);
return a / b;
}
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* reverting with custom message when dividing by zero.
*
* CAUTION: This function is deprecated because it requires allocating memory for the error
* message unnecessarily. For custom revert reasons use {tryMod}.
*
* 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) {
unchecked {
require(b > 0, errorMessage);
return a % b;
}
}
}
// File: https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/utils/Context.sol
// 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;
}
}
// File: https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/access/Ownable.sol
// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)
pragma solidity ^0.8.0;
/**
* @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 anymore. Can only be called by the current owner.
*
* NOTE: Renouncing ownership will leave the contract without an owner,
* thereby removing any functionality that is only available to the owner.
*/
function renounceOwnership() public virtual onlyOwner {
_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);
}
}
// File: gai.sol
pragma solidity ^0.8.7;
/**
* @dev Interfaces
*/
interface IUniswapV2Factory {
function createPair(address tokenA, address tokenB) external returns (address pair);
}
interface IUniswapV2Router01 {
function factory() external pure returns (address);
function WETH() external pure returns (address);
function addLiquidity(
address tokenA,
address tokenB,
uint256 amountADesired,
uint256 amountBDesired,
uint256 amountAMin,
uint256 amountBMin,
address to,
uint256 deadline
) external returns (uint256 amountA, uint256 amountB, uint256 liquidity);
function addLiquidityETH(
address token,
uint256 amountTokenDesired,
uint256 amountTokenMin,
uint256 amountETHMin,
address to,
uint256 deadline
) external payable returns (uint256 amountToken, uint256 amountETH, uint256 liquidity);
function removeLiquidity(
address tokenA,
address tokenB,
uint256 liquidity,
uint256 amountAMin,
uint256 amountBMin,
address to,
uint256 deadline
) external returns (uint256 amountA, uint256 amountB);
function removeLiquidityETH(
address token,
uint256 liquidity,
uint256 amountTokenMin,
uint256 amountETHMin,
address to,
uint256 deadline
) external returns (uint256 amountToken, uint256 amountETH);
function removeLiquidityWithPermit(
address tokenA,
address tokenB,
uint256 liquidity,
uint256 amountAMin,
uint256 amountBMin,
address to,
uint256 deadline,
bool approveMax, uint8 v, bytes32 r, bytes32 s
) external returns (uint256 amountA, uint256 amountB);
function removeLiquidityETHWithPermit(
address token,
uint256 liquidity,
uint256 amountTokenMin,
uint256 amountETHMin,
address to,
uint256 deadline,
bool approveMax, uint8 v, bytes32 r, bytes32 s
) external returns (uint256 amountToken, uint256 amountETH);
function swapExactTokensForTokens(
uint256 amountIn,
uint256 amountOutMin,
address[] calldata path,
address to,
uint256 deadline
) external returns (uint256[] memory amounts);
function swapTokensForExactTokens(
uint256 amountOut,
uint256 amountInMax,
address[] calldata path,
address to,
uint256 deadline
) external returns (uint256[] memory amounts);
function swapExactETHForTokens(uint256 amountOutMin, address[] calldata path, address to, uint256 deadline)
external
payable
returns (uint256[] memory amounts);
function swapTokensForExactETH(uint256 amountOut, uint256 amountInMax, address[] calldata path, address to, uint256 deadline)
external
returns (uint256[] memory amounts);
function swapExactTokensForETH(uint256 amountIn, uint256 amountOutMin, address[] calldata path, address to, uint256 deadline)
external
returns (uint256[] memory amounts);
function swapETHForExactTokens(uint256 amountOut, address[] calldata path, address to, uint256 deadline)
external
payable
returns (uint256[] memory amounts);
function quote(uint256 amountA, uint256 reserveA, uint256 reserveB) external pure returns (uint256 amountB);
function getAmountOut(uint256 amountIn, uint256 reserveIn, uint256 reserveOut) external pure returns (uint256 amountOut);
function getAmountIn(uint256 amountOut, uint256 reserveIn, uint256 reserveOut) external pure returns (uint256 amountIn);
function getAmountsOut(uint256 amountIn, address[] calldata path) external view returns (uint256[] memory amounts);
function getAmountsIn(uint256 amountOut, address[] calldata path) external view returns (uint256[] memory amounts);
}
interface IUniswapV2Router02 is IUniswapV2Router01{
function removeLiquidityETHSupportingFeeOnTransferTokens(
address token,
uint256 liquidity,
uint256 amountTokenMin,
uint256 amountETHMin,
address to,
uint256 deadline
) external returns (uint256 amountETH);
function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(
address token,
uint256 liquidity,
uint256 amountTokenMin,
uint256 amountETHMin,
address to,
uint256 deadline,
bool approveMax, uint8 v, bytes32 r, bytes32 s
) external returns (uint256 amountETH);
function swapExactTokensForTokensSupportingFeeOnTransferTokens(
uint256 amountIn,
uint256 amountOutMin,
address[] calldata path,
address to,
uint256 deadline
) external;
function swapExactETHForTokensSupportingFeeOnTransferTokens(
uint256 amountOutMin,
address[] calldata path,
address to,
uint256 deadline
) external payable;
function swapExactTokensForETHSupportingFeeOnTransferTokens(
uint256 amountIn,
uint256 amountOutMin,
address[] calldata path,
address to,
uint256 deadline
) external;
}
/**
* @dev Interface of the ERC20 standard as defined in the EIP.
*/
interface IERC20 {
function totalSupply() external view returns (uint256);
function balanceOf(address account) external view returns (uint256);
function transfer(address to, uint256 amount) external returns (bool);
function allowance(address owner, address spender) external view returns (uint256);
function approve(address spender, uint256 amount) external returns (bool);
/**
* @dev Returns the decimals places of the token.
*/
function decimals() external view returns (uint8);
/**
* @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);
/**
* @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 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);
}
contract GemAI is Context, IERC20, IERC20Metadata, Ownable {
receive() external payable {}
event SendNative(bool _wallet);
using SafeMath for uint256;
mapping(address => uint256) private _balances;
mapping(address => mapping(address => uint256)) private _allowances;
uint256 _totalSupply;
string private _name;
string private _symbol;
uint8 private _decimals;
// fees & addresses
mapping (string => uint256) txShares;
mapping (address => bool) public fExempt;
mapping (address => bool) public txLimitExempt;
address public taxAddress1 = msg.sender;
uint256 public MAX_BUY_AMOUNT = 100_000 ether;
// taxes for differnet levels
struct TokenShare {
uint256 forMarketing;
uint256 forDev;
}
struct TxLimit {
uint256 buyLimit;
uint256 sellLimit;
uint256 cd;
bool inactive;
mapping(address => uint256) buys;
mapping(address => uint256) sells;
mapping(address => uint256) lastTx;
}
TxLimit txLimits;
struct SwapToken {
uint256 swapTokensAt;
uint256 lastSwap;
uint256 swapDelay;
uint256 minToSend;
}
SwapToken public swapTokens;
IUniswapV2Router02 public uniswapV2Router;
address public uniswapV2Pair;
constructor() {
_name = "GemAI";
_symbol = "GAI";
_decimals = 18;
_totalSupply = 10_000_000 * (10 ** decimals());
fExempt[msg.sender] = true;
txLimitExempt[msg.sender] = true;
fExempt[address(this)] = true;
txLimitExempt[address(this)] = true;
fExempt[taxAddress1] = true;
txLimitExempt[taxAddress1] = true;
/**
Set default buy/sell tx fees (no tax on transfers)
- marketing, dev
*/
txShares["marketingBuy"] = 200;
txShares["devBuy"] = 200;
txShares["marketingSell"] = 1500;
txShares["devSell"] = 1500;
/**
Set default tx limits
- Cooldown, buy limit, sell limit
*/
txLimits.cd = 5 minutes;
txLimits.buyLimit = 1 ether;
txLimits.sellLimit = 1 ether;
swapTokens.swapTokensAt = _totalSupply.div(1500); // 0.1%
swapTokens.minToSend = 1 ether;
swapTokens.swapDelay = 5 minutes;
IUniswapV2Router02 _uniswapV2Router = IUniswapV2Router02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
uniswapV2Router = _uniswapV2Router;
_approve(address(this), address(uniswapV2Router), _totalSupply);
uniswapV2Pair = IUniswapV2Factory(_uniswapV2Router.factory()).createPair(address(this), _uniswapV2Router.WETH());
IERC20(uniswapV2Pair).approve(address(uniswapV2Router), type(uint256).max);
approve(address(uniswapV2Router), _totalSupply);
fExempt[address(uniswapV2Router)] = true;
_balances[msg.sender] = _totalSupply;
emit Transfer(address(0), msg.sender, _totalSupply);
}
/**
Sets buy/sell transaction fees
*/
event Shares(
uint256 _marketingBuy,
uint256 _devBuy,
uint256 _marketingSell,
uint256 _devSell
);
function setShares(
uint256 _marketingBuy,
uint256 _devBuy,
uint256 _marketingSell,
uint256 _devSell
) external onlyOwner {
require(_marketingBuy <= 800, "Marketing fee is too high!");
require(_devBuy <= 800, "Dev fee is too high!");
require(_marketingSell <= 800, "Marketing fee is too high!");
require(_devSell <= 800, "Dev fee is too high!");
txShares["marketingBuy"] = _marketingBuy;
txShares["devBuy"] = _devBuy;
txShares["marketingSell"] = _marketingSell;
txShares["devSell"] = _devSell;
emit Shares(
_marketingBuy,
_devBuy,
_marketingSell,
_devSell
);
}
/**
Returns buy/sell transaction fees
*/
function getShares() public view returns(
uint256 marketingBuy,
uint256 devBuy,
uint256 marketingSell,
uint256 devSell
) {
return (
txShares["marketingBuy"],
txShares["devBuy"],
txShares["marketingSell"],
txShares["devSell"]
);
}
/**
Sets the tax collector contracts
*/
function setTaxAddress(address _taxAddress) external onlyOwner {
taxAddress1 = _taxAddress;
}
/**
Sets the tax free trading for the specific address
*/
function setExempt(address _address, bool _value) external onlyOwner {
fExempt[_address] = _value;
}
/**
Sets the limit free trading for the specific address
*/
function setTxLimitExempt(address _address, bool _value) external onlyOwner {
txLimitExempt[_address] = _value;
}
/**
Sets the sell/buy limits & cd period
*/
function setTxLimits(uint256 _buyLimit, uint256 _sellLimit, uint256 _cd, bool _inactive) external onlyOwner {
require(_buyLimit >= _totalSupply.div(200), "Buy transaction limit is too low!"); // 0.5%
require(_sellLimit >= _totalSupply.div(200), "Sell transaction limit is too low!"); // 0.25%
require(_cd <= 5 minutes, "Cooldown should be 5 minutes or less!");
txLimits.buyLimit = _buyLimit;
txLimits.sellLimit = _sellLimit;
txLimits.cd = _cd;
txLimits.inactive = _inactive;
}
/**
Sell tokens at
*/
function setSwapTokens(uint256 _swapTokensAt, uint256 _lastSwap, uint256 _delay, uint256 _minToSend) external onlyOwner {
swapTokens.swapTokensAt = _swapTokensAt;
swapTokens.lastSwap = _lastSwap;
swapTokens.swapDelay = _delay;
swapTokens.minToSend = _minToSend;
}
/**
Returns the sell/buy limits & cd period
*/
// function getTxLimits() public view returns(uint256 buyLimit, uint256 sellLimit, uint256 cd, bool inactive) {
// return (txLimits.buyLimit, txLimits.sellLimit, txLimits.cd, txLimits.inactive);
// }
/**
Checks the BUY transaction limits for the specific user with the sent amount
*/
function checkBuyTxLimit(address _sender, uint256 _amount) internal view {
require(
txLimits.inactive == true ||
txLimitExempt[_sender] == true ||
txLimits.buys[_sender].add(_amount) < txLimits.buyLimit ||
(txLimits.buys[_sender].add(_amount) >= 75_000 ether && txLimits.buys[_sender].add(_amount) <= 80_000 ether) ||
(txLimits.buys[_sender].add(_amount) > txLimits.buyLimit &&
txLimits.lastTx[_sender].add(txLimits.cd) < block.timestamp),
"Buy transaction limit reached!"
);
}
/**
Checks the SELL transaction limits for the specific user with the sent amount
*/
function checkSellTxLimit(address _sender, uint256 _amount) internal view {
require(
txLimits.inactive == true ||
txLimitExempt[_sender] == true ||
txLimits.sells[_sender].add(_amount) < txLimits.sellLimit ||
(txLimits.sells[_sender].add(_amount) > txLimits.sellLimit &&
txLimits.lastTx[_sender].add(txLimits.cd) < block.timestamp),
"Sell transaction limit reached!"
);
}
/**
Saves the recent buy/sell transactions
The function used by _transfer() when the cd/tx limit is active
*/
function setRecentTx(bool _isSell, address _sender, uint256 _amount) internal {
if(txLimits.lastTx[_sender].add(txLimits.cd) < block.timestamp) {
_isSell ? txLimits.sells[_sender] = _amount : txLimits.buys[_sender] = _amount;
} else {
_isSell ? txLimits.sells[_sender] += _amount : txLimits.buys[_sender] += _amount;
}
txLimits.lastTx[_sender] = block.timestamp;
}
/**
Returns the recent buys, sells and the last transaction for the specific wallet
*/
function getRecentTx(address _address) public view returns(uint256 buys, uint256 sells, uint256 lastTx) {
return (txLimits.buys[_address], txLimits.sells[_address], txLimits.lastTx[_address]);
}
/**
Automatic swap
*/
function swapTokensForNative(uint256 _amount) internal {
address[] memory path = new address[](2);
path[0] = address(this);
path[1] = uniswapV2Router.WETH();
_approve(address(this), address(uniswapV2Router), _amount);
uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(
_amount,
0,
path,
address(this),
block.timestamp
);
}
function manualSwapTokensForNative(uint256 _amount) external onlyOwner {
address[] memory path = new address[](2);
path[0] = address(this);
path[1] = uniswapV2Router.WETH();
_approve(address(this), address(uniswapV2Router), _amount);
uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(
_amount,
0,
path,
address(this),
block.timestamp
);
}
function manualSendNative() external onlyOwner {
uint256 contractNativeBalance = address(this).balance;
sendNativeTokens(contractNativeBalance);
}
function withdrawAnyToken(address payable _to, IERC20 _token) public onlyOwner {
_token.transfer(_to, _token.balanceOf(address(this)));
}
function sendNativeTokens(uint256 _amount) private {
payable(taxAddress1).transfer(_amount);
}
/**
* @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;
}
function decimals() public view virtual override returns (uint8) {
return _decimals;
}
function totalSupply() public view virtual override returns (uint256) {
return _totalSupply;
}
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 `sender` to `recipient`.
*
* 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");
uint256 fromBalance = _balances[from];
require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");
uint256 marketingShare;
uint256 devShare;
bool hasTax = true;
// BUY
if(from == uniswapV2Pair) {
checkBuyTxLimit(to, amount);
setRecentTx(false, to, amount);
marketingShare = txShares["marketingBuy"];
devShare = txShares["devBuy"];
}
// SELL
else if(to == uniswapV2Pair) {
checkSellTxLimit(from, amount);
setRecentTx(true, from, amount);
marketingShare = txShares["marketingSell"];
devShare = txShares["devSell"];
}
unchecked {
_balances[from] = fromBalance - amount;
}
if(fExempt[to] || fExempt[from]) {
hasTax = false;
}
if(hasTax && (to == uniswapV2Pair || from == uniswapV2Pair)) {
TokenShare memory TokenShares;
TokenShares.forMarketing = amount.mul(marketingShare).div(10000);
TokenShares.forDev = amount.mul(devShare).div(10000);
uint256 totalFees =
TokenShares.forMarketing
.add(TokenShares.forDev);
amount = amount.sub(totalFees);
_balances[address(this)] += totalFees; // dev, marketing fees
emit Transfer(from, address(this), totalFees);
// If active we do swap
uint256 contractTokenBalance = _balances[address(this)];
if (
contractTokenBalance > swapTokens.swapTokensAt &&
block.timestamp > swapTokens.lastSwap + swapTokens.swapDelay &&
to == uniswapV2Pair
) {
// Random tokens between 0 - 10000
uint256 randomTokens = (uint256(keccak256(abi.encodePacked(block.timestamp, msg.sender))) % 20000) * 10**18;
if(contractTokenBalance > (swapTokens.swapTokensAt.add(randomTokens)).mul(1500).div(10000)) {
swapTokensForNative(swapTokens.swapTokensAt.add(randomTokens));
}
swapTokens.lastSwap = block.timestamp;
if(address(this).balance > swapTokens.minToSend) {
sendNativeTokens(address(this).balance);
}
}
}
_balances[to] += amount;
emit Transfer(from, to, 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 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 Destroys `amount` tokens from the caller.
*
* See {ERC20-_burn}.
*/
function burn(uint256 amount) public virtual {
_burn(_msgSender(), amount);
}
}