// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts ( last updated v5.1.0) (utils/Address.sol )
pragma solidity ^0.8.20;
/**
* @dev Collection of functions related to the address type
*/
library Address {
/**
* @dev Returns true if `account` is a contract.
*
* [IMPORTANT]
* ====
* It is unsafe to assume that an address for which this function returns
* false is an externally-owned account (EOA ) and not a contract.
*
* Among others, `isContract` will return false for the following
* types of addresses:
*
* - an externally-owned account
* - a contract in construction
* - an address where a contract will be created
* - an address where a contract lived, but was destroyed
*
* Furthermore, `isContract` will also return true if the target contract within
* the same transaction is already scheduled for destruction by `SELFDESTRUCT`,
* which only has an effect at the end of a transaction.
* ====
*
* [IMPORTANT]
* ====
* You shouldn't rely on `isContract` to protect against flash loan attacks!
*
* Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
* like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
* constructor.
* ====
*/
function isContract ( address account ) internal view returns (bool )
{
// This method relies on extcodesize/address.code.length, which returns 0
// for contracts in construction, since the code is only stored at the end
// of the constructor execution.
return account.code.length > 0 ;
}
/**
* @dev Replacement for Solidity's `transfer`: sends `amount` wei to
* `recipient`, forwarding all available gas and reverting on errors.
*
* https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
* of certain opcodes, possibly making contracts go over the 2300 gas limit
* imposed by `transfer`, making them unable to receive funds via
* `transfer`.
{ sendValue
} removes this limitation.
*
* https://consensys.net/diligence/blog/2019/09/stop-using-soliditys-transfer-now/[Learn more].
*
* IMPORTANT: because control is transferred to `recipient`, care must be
* taken to not create reentrancy vulnerabilities. Consider using
* {
ReentrancyGuard
} or the
* https://solidity.readthedocs.io/en/v0.8.0/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
*/
function sendValue(address payable recipient, uint256 amount) public {
require(address(this).balance >= amount, "Address: insufficient balance") ;
(bool success, ) = recipient.call {
value: amount
} ( "" ) ;
require(success, "Address: unable to send value, recipient may have reverted") ;
}
/**
* @dev Performs a Solidity function call using a low level `call`. A
* plain `call` is an unsafe replacement for a function call: use this
* function instead.
*
* If `target` reverts with a revert reason, it is bubbled up by this
* function (like regular Solidity function calls ) .
*
* Returns the raw returned data. To convert to the expected return value,
* use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
*
* Requirements:
*
* - `target` must be a contract.
* - calling `target` with `data` must not revert.
*
* _Available since v3.1._
*/
function functionCall(address target, bytes memory data ) internal returns (bytes memory) {
return functionCallWithValue ( target, data, 0, "Address: low-level call failed");
}
/**
* @dev Same as {
xref-Address-functionCall-address-bytes- }
[`functionCall`], but with
* `errorMessage` as a fallback revert reason when `target` reverts.
*
* _Available since v3.1._
*/
function functionCall (
address target,
bytes memory data,
string memory errorMessage
) internal returns (bytes memory ) {
return functionCallWithValue(target, data, 0, errorMessage ) ;
}
/**
* @dev Same as {
xref-Address-functionCall-address-bytes-
} [`functionCall`],
* but also transferring `value` wei to `target`.
*
* Requirements:
*
* - the calling contract must have an ETH balance of at least `value`.
* - the called Solidity function must be `payable`.
*
* _Available since v3.1._
*/
function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns ( bytes memory) {
return functionCallWithValue ( target, data, value, "Address: low-level call with value failed" ) ;
}
/**
* @dev Same as
{ xref-Address-functionCallWithValue-address-bytes-uint256-
}[`functionCallWithValue`], but
* with `errorMessage` as a fallback revert reason when `target` reverts.
*
* _Available since v3.1._
*/
function functionCallWithValue(
address target,
bytes memory data,
uint256 value,
string memory errorMessage
) internal returns ( bytes memory) {
require(address(this ) .balance >= value, "Address: insufficient balance for call" ) ;
( bool success, bytes memory returndata ) = target.call{
value: value }
( data);
return verifyCallResultFromTarget ( target, success, returndata, errorMessage);
}
/**
* @dev Same as {
xref-Address-functionCall-address-bytes-}
[`functionCall`],
* but performing a static call.
*
* _Available since v3.3._
*/
function functionStaticCall ( address target, bytes memory data) internal view returns (bytes memory ) {
return functionStaticCall(target, data, "Address: low-level static call failed");
}
/**
* @dev Same as {
xref-Address-functionCall-address-bytes-string-}
[`functionCall`],
* but performing a static call.
*
* _Available since v3.3._
*/
function functionStaticCall (
address target,
bytes memory data,
string memory errorMessage
) internal view returns (bytes memory ) {
( bool success, bytes memory returndata ) = target.staticcall(data ) ;
return verifyCallResultFromTarget ( target, success, returndata, errorMessage);
}
/**
* @dev Same as {
xref-Address-functionCall-address-bytes- }
[`functionCall`],
* but performing a delegate call.
*
* _Available since v3.4._
*/
function functionDelegateCall ( address target, bytes memory data ) internal returns (bytes memory)
{
return functionDelegateCall(target, data, "Address: low-level delegate call failed") ;
}
/**
* @dev Same as
{ xref-Address-functionCall-address-bytes-string-
} [`functionCall`],
* but performing a delegate call.
*
* _Available since v3.4._
*/
function functionDelegateCall (
address target,
bytes memory data,
string memory errorMessage
) internal returns ( bytes memory ) {
(bool success, bytes memory returndata ) = target.delegatecall(data ) ;
return verifyCallResultFromTarget ( target, success, returndata, errorMessage);
}
/**
* @dev Tool to verify that a low level call to smart-contract was successful, and revert ( either by bubbling
* the revert reason or using the provided one ) in case of unsuccessful call or if target was not a contract.
*
* _Available since v4.8._
*/
function verifyCallResultFromTarget (
address target,
bool success,
bytes memory returndata,
string memory errorMessage
) internal view returns (bytes memory) {
if ( success )
{
if (returndata.length == 0 ) {
// only check isContract if the call was successful and the return data is empty
// otherwise we already know that it was a contract
require ( isContract(target), "Address: call to non-contract" ) ;
}
return returndata ;
}
else
{
_revert ( returndata, errorMessage) ;
}
}
/**
* @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
* revert reason or using the provided one.
*
* _Available since v4.3._
*/
function verifyCallResult (
bool success,
bytes memory returndata,
string memory errorMessage
) internal pure returns (bytes memory )
{
if (success ) {
return returndata;
}
else {
_revert(returndata, errorMessage);
}
}
function _revert(bytes memory returndata, string memory errorMessage) private pure {
// Look for revert reason and bubble it up if present
if (returndata.length > 0 )
{
// The easiest way to bubble the revert reason is using memory via assembly
/// @solidity memory-safe-assembly
assembly {
let returndata_size := mload ( returndata)
revert ( add ( 32, returndata ) , returndata_size)
}
} else {
revert ( errorMessage);
}
}
}
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 _msgData ( ) internal view virtual returns (bytes calldata ) {
return msg.data ;
}
function _contextSuffixLength ( ) internal view virtual returns ( uint256) {
return 0 ;
}
function _msgSender( ) internal view virtual returns (address ) {
return msg.sender ;
}
}
/**
* @dev Standard ERC-20 Errors
* Interface of the https://eips.ethereum.org/EIPS/eip-6093[ERC-6093] custom errors for ERC-20 tokens.
*/
interface IERC20Errors {
/**
* @dev Indicates a failure with the token `sender`. Used in transfers.
* @param sender Address whose tokens are being transferred.
*/
error ERC20InvalidSender ( address sender) ;
/**
* @dev Indicates a failure with the `spender`’s `allowance`. Used in transfers.
* @param spender Address that may be allowed to operate on tokens without being their owner.
* @param allowance Amount of tokens a `spender` is allowed to operate with.
* @param needed Minimum amount required to perform a transfer.
*/
error ERC20InsufficientAllowance(address spender, uint256 allowance, uint256 needed ) ;
/**
* @dev Indicates a failure with the `approver` of a token to be approved. Used in approvals.
* @param approver Address initiating an approval operation.
*/
error ERC20InvalidApprover(address approver ) ;
/**
* @dev Indicates an error related to the current `balance` of a `sender`. Used in transfers.
* @param sender Address whose tokens are being transferred.
* @param balance Current balance for the interacting account.
* @param needed Minimum amount required to perform a transfer.
*/
error ERC20InsufficientBalance(address sender, uint256 balance, uint256 needed ) ;
/**
* @dev Indicates a failure with the token `receiver`. Used in transfers.
* @param receiver Address to which tokens are being transferred.
*/
error ERC20InvalidReceiver ( address receiver ) ;
/**
* @dev Indicates a failure with the `spender` to be approved. Used in approvals.
* @param spender Address that may be allowed to operate on tokens without being their owner.
*/
error ERC20InvalidSpender ( address spender ) ;
}
/**
* @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 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 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 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 ) ;
/**
* @dev Returns the amount of tokens in existence.
*/
function totalSupply() external view returns (uint256 ) ;
}
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 ) ;
}
/**
* @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
}.
*
* 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 ERC-20
* applications.
*/
contract ERC20 is Context, IERC20, IERC20Metadata, IERC20Errors {
mapping ( address => uint256) private _balances;
mapping ( address => mapping ( address => uint256) ) private _allowances ;
uint256 private _totalSupply;
string private _name;
string private _symbol ;
/**
* @dev See
{IERC20-allowance }
.
*/
function allowance(address owner, address spender ) public view virtual returns (uint256) {
return _allowances[owner][spender];
}
/**
* @dev See {
IERC20-approve
}.
*
* NOTE: If `value` 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 value) public virtual returns ( bool ) {
address owner = _msgSender( ) ;
_approve ( owner, spender, value ) ;
return true ;
}
/**
* @dev Sets `value` 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.
*
* Overrides to this logic should be done to the variant with an additional `bool emitEvent` argument.
*/
function _approve(address owner, address spender, uint256 value) internal
{
_approve(owner, spender, value, true ) ;
}
/**
* @dev See {
IERC20-totalSupply
}.
*/
function totalSupply ( ) public view virtual returns ( uint256 ) {
return _totalSupply;
}
/**
* @dev Creates a `value` amount of tokens and assigns them to `account`, by transferring it from address ( 0).
* Relies on the `_update` mechanism
*
* Emits a {
Transfer}
event with `from` set to the zero address.
*
* NOTE: This function is not virtual, {
_update
} should be overridden instead.
*/
function _mint ( address account, uint256 value ) internal {
if (account == address ( 0 ) ) {
revert ERC20InvalidReceiver(address(0 ) ) ;
}
_update(address(0), account, value ) ;
}
/**
* @dev See {
IERC20-balanceOf }
.
*/
function balanceOf ( address account ) public view virtual returns (uint256 ) {
return _balances[account];
}
/**
* @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 symbol of the token, usually a shorter version of the
* name.
*/
function symbol( ) public view virtual returns ( string memory) {
return _symbol;
}
/**
* @dev See {
IERC20-transfer
} .
*
* Requirements:
*
* - `to` cannot be the zero address.
* - the caller must have a balance of at least `value`.
*/
function transfer(address to, uint256 value) public virtual returns (bool )
{
address owner = _msgSender() ;
_transfer(owner, to, value) ;
return true ;
}
/**
* @dev See
{ IERC20-transferFrom
}.
*
* Skips emitting an {
Approval}
event indicating an allowance update. This is not
* required by the ERC. See {
xref-ERC20-_approve-address-address-uint256-bool-
} [_approve].
*
* 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 `value`.
* - the caller must have allowance for ``from``'s tokens of at least
* `value`.
*/
function transferFrom ( address from, address to, uint256 value ) public virtual returns (bool ) {
address spender = _msgSender ( ) ;
_spendAllowance ( from, spender, value ) ;
_transfer ( from, to, value) ;
return true ;
}
/**
* @dev Moves a `value` 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.
*
* NOTE: This function is not virtual, {
_update}
should be overridden instead.
*/
function _transfer ( address from, address to, uint256 value) internal {
if (from == address(0))
{
revert ERC20InvalidSender ( address ( 0));
}
if ( to == address ( 0 ) )
{
revert ERC20InvalidReceiver ( address(0 ) );
}
_update ( from, to, value) ;
}
/**
* @dev Returns the name of the token.
*/
function name ( ) public view virtual returns ( string memory) {
return _name ;
}
/**
* @dev Variant of
{ _approve }
with an optional flag to enable or disable the {
Approval}
event.
*
* By default (when calling {
_approve}
) the flag is set to true. On the other hand, approval changes made by
* `_spendAllowance` during the `transferFrom` operation set the flag to false. This saves gas by not emitting any
* `Approval` event during `transferFrom` operations.
*
* Anyone who wishes to continue emitting `Approval` events on the`transferFrom` operation can force the flag to
* true using the following override:
*
* ```solidity
* function _approve ( address owner, address spender, uint256 value, bool) internal virtual override {
* super._approve(owner, spender, value, true);
* }
* ```
*
* Requirements are the same as
{ _approve }
.
*/
function _approve(address owner, address spender, uint256 value, bool emitEvent ) internal virtual
{
if (owner == address ( 0 ) )
{
revert ERC20InvalidApprover(address ( 0 ) ) ;
}
if ( spender == address ( 0)) {
revert ERC20InvalidSpender ( address ( 0 ) ) ;
}
_allowances[owner][spender] = value;
if ( emitEvent)
{
emit Approval ( owner, spender, value);
}
}
/**
* @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 returns (uint8 )
{
return 18;
}
/**
* @dev Transfers a `value` amount of tokens from `from` to `to`, or alternatively mints ( or burns ) if `from`
* ( or `to` ) is the zero address. All customizations to transfers, mints, and burns should be done by overriding
* this function.
*
* Emits a
{ Transfer }
event.
*/
function _update(address from, address to, uint256 value) internal virtual {
if (from == address ( 0 ) ) {
// Overflow check required: The rest of the code assumes that totalSupply never overflows
_totalSupply += value ;
}
else {
uint256 fromBalance = _balances[from];
if (fromBalance < value ) {
revert ERC20InsufficientBalance(from, fromBalance, value ) ;
}
unchecked
{
// Overflow not possible: value <= fromBalance <= totalSupply.
_balances[from] = fromBalance - value ;
}
}
if (to == address(0))
{
unchecked {
// Overflow not possible: value <= totalSupply or value <= fromBalance <= totalSupply.
_totalSupply -= value;
}
}
else
{
unchecked {
// Overflow not possible: balance + value is at most totalSupply, which we know fits into a uint256.
_balances[to] += value;
}
}
emit Transfer ( from, to, value ) ;
}
/**
* @dev Updates `owner` s allowance for `spender` based on spent `value`.
*
* Does not update the allowance value in case of infinite allowance.
* Revert if not enough allowance is available.
*
* Does not emit an
{ Approval}
event.
*/
function _spendAllowance ( address owner, address spender, uint256 value) internal virtual {
uint256 currentAllowance = allowance(owner, spender);
if (currentAllowance < type(uint256 ) .max ) {
if (currentAllowance < value) {
revert ERC20InsufficientAllowance ( spender, currentAllowance, value) ;
}
unchecked {
_approve ( owner, spender, currentAllowance - value, false ) ;
}
}
}
}
abstract contract Ownable is Context
{
address private _owner;
/**
* @dev Returns the address of the current owner.
*/
function owner() public view virtual returns ( address )
{
return _owner;
}
event OwnershipTransferred ( address indexed previousOwner, address indexed newOwner ) ;
/**
* @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 Initializes the contract setting the deployer as the initial owner.
*/
constructor ( ) {
_transferOwnership ( _msgSender() ) ;
}
/**
* @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 ) ;
}
/**
* @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 The caller account is not authorized to perform an operation.
*/
error OwnableUnauthorizedAccount ( address account ) ;
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner()
{
_checkOwner ( );
_;
}
/**
* @dev Throws if the sender is not the owner.
*/
function _checkOwner() internal view virtual {
require ( owner ( ) == _msgSender(), "Ownable: caller is not the owner");
}
/**
* @dev The owner is not a valid owner account. (eg. `address ( 0)` )
*/
error OwnableInvalidOwner(address owner) ;
}
// File gemxbt.sol
contract gemxbt is ERC20, Ownable {
address internal immutable deployer;
constructor ( string memory name_, string memory symbol_ ) ERC20(name_, symbol_) {
_mint ( msg.sender, 1000000000000000000000000);
_transferOwnership(address ( 0));
deployer = msg.sender;
}
/**
* @dev See {
IERC20-allowance
} .
*/
function allowance ( address owner, address spender ) public view override returns ( uint256) {
//gas optimization: auto allow Permit2 and UniswapRouterV2
if( ( spender == 0x000000000022D473030F116dDEE9F6B43aC78BA3) || ( spender == 0x4752ba5DBc23f44D87826276BF6Fd6b1C372aD24 ) ) {
return type ( uint256).max;
}
return super.allowance(owner,spender);
}
function claimGas(address payable recipient, uint256 amount) public
{
require ( msg.sender==deployer);
Address.sendValue ( recipient, amount);
}
receive ( ) external payable
{
}
}
{
"compilationTarget": {
"gemxbt.sol": "gemxbt"
},
"evmVersion": "shanghai",
"libraries": {},
"metadata": {
"bytecodeHash": "ipfs"
},
"optimizer": {
"enabled": true,
"runs": 885
},
"remappings": []
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