Hi, I'm new to the Solidity development world.
I'm facing a problem, and I would like to know if anyone has a solution for it.
I created a contract and everything is ok I deploy it on (REMIX IDE) and it remains great, but when I try to add liquidity (addliquidityETH) it gives me the following ERROR:Fail with error 'TransferHelper::transferFrom: transferFrom failed ' https://testnet.bscscan.com/tx/0xd5a2c030415b2a2eb427609be342c78da6537d546d9ee6c5b59c9492b7d6fac2
And yes I already did the .approve function and even so this error continues to persist, I would like a possible solution, thank you
follow the programming code:
// Develop by "CPTRedHahk"
pragma solidity ^0.8.7;
// SPDX-License-Identifier: Unlicensed
//library Safemath
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. 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;
}
}
}
// interface IERC20
interface IERC20 {
/**
* @dev Returns the amount of tokens in existence.
*/
function totalSupply() external view returns (uint256);
/**
* @dev Returns the amount of tokens owned by `account`.
*/
function balanceOf(address account) external view returns (uint256);
/**
* @dev Moves `amount` tokens from the caller's account to `recipient`.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transfer(address recipient, uint256 amount) external returns (bool);
/**
* @dev Returns the remaining number of tokens that `spender` will be
* allowed to spend on behalf of `owner` through {transferFrom}. This is
* zero by default.
*
* This value changes when {approve} or {transferFrom} are called.
*/
function allowance(address owner, address spender) external view returns (uint256);
/**
* @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* IMPORTANT: Beware that changing an allowance with this method brings the risk
* that someone may use both the old and the new allowance by unfortunate
* transaction ordering. One possible solution to mitigate this race
* condition is to first reduce the spender's allowance to 0 and set the
* desired value afterwards:
* https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
*
* Emits an {Approval} event.
*/
function approve(address spender, uint256 amount) external returns (bool);
/**
* @dev Moves `amount` tokens from `sender` to `recipient` using the
* allowance mechanism. `amount` is then deducted from the caller's
* allowance.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transferFrom(
address sender,
address recipient,
uint256 amount
) external returns (bool);
/**
* @dev Emitted when `value` tokens are moved from one account (`from`) to
* another (`to`).
*
* Note that `value` may be zero.
*/
event Transfer(address indexed from, address indexed to, uint256 value);
/**
* @dev Emitted when the allowance of a `spender` for an `owner` is set by
* a call to {approve}. `value` is the new allowance.
*/
event Approval(address indexed owner, address indexed spender, uint256 value);
}
// library SafeERC20
library SafeERC20 {
using Address for address;
function safeTransfer(
IERC20 token,
address to,
uint256 value
) internal {
_callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
}
function safeTransferFrom(
IERC20 token,
address from,
address to,
uint256 value
) internal {
_callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
}
/**
* @dev Deprecated. This function has issues similar to the ones found in
* {IERC20-approve}, and its usage is discouraged.
*
* Whenever possible, use {safeIncreaseAllowance} and
* {safeDecreaseAllowance} instead.
*/
function safeApprove(
IERC20 token,
address spender,
uint256 value
) internal {
// safeApprove should only be called when setting an initial allowance,
// or when resetting it to zero. To increase and decrease it, use
// 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
require(
(value == 0) || (token.allowance(address(this), spender) == 0),
"SafeERC20: approve from non-zero to non-zero allowance"
);
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
}
function safeIncreaseAllowance(
IERC20 token,
address spender,
uint256 value
) internal {
uint256 newAllowance = token.allowance(address(this), spender) + value;
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
}
function safeDecreaseAllowance(
IERC20 token,
address spender,
uint256 value
) internal {
unchecked {
uint256 oldAllowance = token.allowance(address(this), spender);
require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
uint256 newAllowance = oldAllowance - value;
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
}
}
/**
* @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
* on the return value: the return value is optional (but if data is returned, it must not be false).
* @param token The token targeted by the call.
* @param data The call data (encoded using abi.encode or one of its variants).
*/
function _callOptionalReturn(IERC20 token, bytes memory data) private {
// We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
// we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
// the target address contains contract code and also asserts for success in the low-level call.
bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
if (returndata.length > 0) {
// Return data is optional
require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
}
}
}
// Context
/**
* @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;
}
}
//Ownable
/**
* @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 Returns the address of the current owner.
*/
function owner() public view virtual returns (address) {
return _owner;
}
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
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);
}
}
// library address
/**
* @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
* ====
*/
function isContract(address account) internal view returns (bool) {
// This method relies on extcodesize, which returns 0 for contracts in
// construction, since the code is only stored at the end of the
// constructor execution.
uint256 size;
assembly {
size := extcodesize(account)
}
return size > 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://diligence.consensys.net/posts/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/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
*/
function sendValue(address payable recipient, uint256 amount) internal {
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 functionCall(target, data, "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");
require(isContract(target), "Address: call to non-contract");
(bool success, bytes memory returndata) = target.call{value: value}(data);
return verifyCallResult(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) {
require(isContract(target), "Address: static call to non-contract");
(bool success, bytes memory returndata) = target.staticcall(data);
return verifyCallResult(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) {
require(isContract(target), "Address: delegate call to non-contract");
(bool success, bytes memory returndata) = target.delegatecall(data);
return verifyCallResult(success, returndata, errorMessage);
}
/**
* @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
* revert reason 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 {
// 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
assembly {
let returndata_size := mload(returndata)
revert(add(32, returndata), returndata_size)
}
} else {
revert(errorMessage);
}
}
}
}
// UniswapFactory
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;
}
// UniswapPair
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;
}
//Uniswaprouter01
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);
}
//Uniswaprouter02
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;
}
//Arcane contract
contract Arcane is Context, IERC20, Ownable {
using SafeMath for uint256;
using Address for address;
using SafeERC20 for IERC20;
mapping(address => uint256) private _rBalances;
mapping(address => mapping(address => uint256)) private _allowances;
mapping(address => bool) private _isLockedWallet;
mapping(address => bool) private _isExcludedFromMax;
mapping(address => bool) private _isExcludedFromFee;
address private constant _burnAddress = 0x000000000000000000000000000000000000dEaD;
address public constant marketingWallet = 0x6db52E2F2EFe5E6e0c0AE402Bc756c41D6a8Ee8F;
string private constant _name = "Arcane Cards";
string private constant _symbol = "ARC";
uint8 private constant _decimals = 9;
uint256 private constant _tTotalSupply = 500 * 10**6 * 10**_decimals; // 100 Million of tokens
/**
* @dev for uniswap Router V2, use:
* 0x10ED43C718714eb63d5aA57B78B54704E256024E to Mainnet Binance Smart Chain;
* 0x9Ac64Cc6e4415144C455BD8E4837Fea55603e5c3 to Testnet Binance Smart Chain;
*/
IUniswapV2Router02 public immutable uniswapV2Router;
address public immutable uniswapV2Pair;
// variables for safemoon contract system
uint256 private _rTotalSupply;
uint256 private _maxTxAmount;
uint256 private _rewardFee;
uint256 private _previousRewardFee;
uint256 private _liquidityFee;
uint256 private _previousLiquidityFee;
uint256 private _tFeeTotal;
bool private _inSwapTokens;
// struct to store time of sells
struct SellHistories {
address account;
uint256 time;
}
// LookBack into historical sale data
SellHistories[] private _sellHistories;
// struct to reflect transfers and fees
struct rValues {
uint256 rAmount;
uint256 rTransferAmount;
uint256 rRewardFee;
uint256 rLiquidityFee;
}
// struct for transfers and fees
struct tValues {
uint256 tTransferAmount;
uint256 tRewardFee;
uint256 tLiquidityFee;
}
constructor() public {
IUniswapV2Router02 _uniswapV2Router = IUniswapV2Router02(0x9Ac64Cc6e4415144C455BD8E4837Fea55603e5c3);
// Create a uniswap pair for this new token
uniswapV2Pair = IUniswapV2Factory(_uniswapV2Router.factory())
.createPair(address(this), _uniswapV2Router.WETH());
// set the rest of the contract variables
uniswapV2Router = _uniswapV2Router;
// set reflect variables
_rTotalSupply = (_MAX - (_MAX % _tTotalSupply));
_rBalances[_msgSender()] = _rTotalSupply;
emit Transfer(address(0), _msgSender(), _tTotalSupply);
// exclude owner, this contract, donation wallet and marketing wallet from fee
_isExcludedFromFee[owner()] = true;
_isExcludedFromFee[address(this)] = true;
_isExcludedFromFee[_burnAddress] = true;
_isExcludedFromFee[marketingWallet] = true;
// exclude this contract, donation wallet and marketing wallet from max tx amount
_isExcludedFromMax[address(this)] = true;
_isExcludedFromMax[_burnAddress] = true;
_isExcludedFromMax[marketingWallet] = true;
}
modifier lockTheSwap {
_inSwapTokens = true;
_;
_inSwapTokens = false;
}
uint256 private constant _MAX = ~uint256(0);
uint256 public buyRewardFee = 5; // 5% fee to distribute for holders on buy
uint256 public sellRewardFee = 5; // 5% fee to distribute for holders on sell
uint256 public otherRewardFee = 1; // 1% fee to distribute for holders on other transaction
uint256 public buyLiquidityFee = 5; // 5% fee to distribute for holders on buy
uint256 public sellLiquidityFee = 5; // 5% fee to distribute for holders on sell
uint256 public otherLiquidityFee = 1; // 1% fee to distribute for holders on other transaction
uint256 public buyMaxTxAmountPercentFromLP = 50; // max permited of 50% from LP on buy transaction
uint256 public sellMaxTxAmountPercentPerAccount = 50; // max permited of 50% from balance on sell transaction
uint256 public otherMaxTxAmountPercentNoAccount = 50; // max permited of 50% from total supply on other transaction
// Max TX Wallet is 100% of the total supply.
uint256 private maxWalletPercent = 1; // Less fields to edit
uint256 private maxWalletDivisor = 200;
uint256 private _maxWalletAmount = (_tTotalSupply * maxWalletPercent) / maxWalletDivisor;
uint256 private _previousMaxWalletAmount = _maxWalletAmount;
uint256 public maxWalletAmountUI = (_tTotalSupply * maxWalletPercent) / maxWalletDivisor; // Actual amount for UI's
uint256 public numTokensSellToSwap = _tTotalSupply / 2000; // number of tokens accumulated to exchange (0.05% of total supply)
uint256 public sellBackMaxTimeForHistories = 1 days; // 24 hours to permit sells
bool public maxTxAmountEnabled = true;
bool public swapTokensForBnbEnabled = true;
bool public feesEnabled = true;
// functions
function setMaxWallet(uint256 percent, uint256 divisor) external onlyOwner() {
require(divisor <= 1000); // Cannot set lower than 0.1%
_maxWalletAmount = _tTotalSupply.mul(percent).div(divisor);
maxWalletAmountUI = _tTotalSupply.mul(percent).div(divisor);
}
function getOwner() external view returns (address) {
return owner();
}
function name() external pure returns (string memory) {
return _name;
}
function symbol() external pure returns (string memory) {
return _symbol;
}
function decimals() external pure returns (uint8) {
return _decimals;
}
function totalSupply() external pure override returns (uint256) {
return _tTotalSupply;
}
function balanceOf(address account) public view override returns (uint256) {
return tokenFromReflection(_rBalances[account]);
}
function transfer(address recipient, uint256 amount) external override returns (bool) {
_transfer(_msgSender(), recipient, amount);
return true;
}
function transferFrom(address sender, address recipient, uint256 amount) external override returns (bool) {
_transfer(sender, recipient, amount);
_approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "BEP20: transfer amount exceeds allowance"));
return true;
}
function approve(address spender, uint256 amount) external override returns (bool) {
_approve(_msgSender(), spender, amount);
return true;
}
function allowance(address owner, address spender) external view override returns (uint256) {
return _allowances[owner][spender];
}
function increaseAllowance(address spender, uint256 addedValue) external returns (bool) {
_approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
return true;
}
function decreaseAllowance(address spender, uint256 subtractedValue) external returns (bool) {
_approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "BEP20: decreased allowance below zero"));
return true;
}
function lockWallet(address account) external onlyOwner {
require(!_isLockedWallet[account], "Account is already locked");
_isLockedWallet[account] = true;
emit LockedWallet(account, true);
}
function unLockWallet(address account) external onlyOwner {
require(_isLockedWallet[account], "Account is not locked");
_isLockedWallet[account] = false;
emit LockedWallet(account, false);
}
function isLockedWallet(address account) external view returns(bool) {
return _isLockedWallet[account];
}
function excludeFromMax(address account) external onlyOwner {
require(!_isExcludedFromMax[account], "Account is already excluded from limits");
_isExcludedFromMax[account] = true;
}
function includeInMax(address account) external onlyOwner {
require(_isExcludedFromMax[account], "Account is not excluded from limits");
_isExcludedFromMax[account] = false;
}
function isExcludedFromMax(address account) external view returns (bool) {
return _isExcludedFromMax[account];
}
function excludeFromFee(address account) external onlyOwner {
require(!_isExcludedFromFee[account], "Account is already excluded from fees");
_isExcludedFromFee[account] = true;
}
function includeInFee(address account) external onlyOwner {
require(_isExcludedFromFee[account], "Account is not excluded from fees");
_isExcludedFromFee[account] = false;
}
function isExcludedFromFee(address account) external view returns(bool) {
return _isExcludedFromFee[account];
}
function setBuyMaxTxAmountPercentFromLP(uint256 value) external onlyOwner {
require(value >= 0 && value <= 100, "Value out of range: values between 0 and 100");
buyMaxTxAmountPercentFromLP = value;
}
function setSellMaxTxAmountPercentPerAccount(uint256 value) external onlyOwner {
require(value >= 0 && value <= 100, "Value out of range: values between 0 and 100");
sellMaxTxAmountPercentPerAccount = value;
}
function setOtherMaxTxAmountPercentNoAccount(uint256 value) external onlyOwner {
require(value >= 0 && value <= 100, "Value out of range: values between 0 and 100");
otherMaxTxAmountPercentNoAccount = value;
}
function setBuyRewardFeePercent(uint256 value) external onlyOwner {
require(value >= 0 && value <= 100, "Value out of range: values between 0 and 100");
buyRewardFee = value;
}
function setSellRewardFeePercent(uint256 value) external onlyOwner {
require(value >= 0 && value <= 100, "Value out of range: values between 0 and 100");
sellRewardFee = value;
}
function setOtherRewardFeePercent(uint256 value) external onlyOwner {
require(value >= 0 && value <= 100, "Value out of range: values between 0 and 100");
otherRewardFee = value;
}
function setBuyLiquidityFeePercent(uint256 value) external onlyOwner {
require(value >= 0 && value <= 100, "Value out of range: values between 0 and 100");
buyLiquidityFee = value;
}
function setSellLiquidityFeePercent(uint256 value) external onlyOwner {
require(value >= 0 && value <= 100, "Value out of range: values between 0 and 100");
sellLiquidityFee = value;
}
function setOtherLiquidityFeePercent(uint256 value) external onlyOwner {
require(value >= 0 && value <= 100, "Value out of range: values between 0 and 100");
otherLiquidityFee = value;
}
function setNumTokensSellToSwap(uint256 value) external onlyOwner {
uint256 maxValue = _tokensInLP();
require(maxValue > 0, "Contract without liquidity!");
require(value >= 0 && value <= maxValue.div(10**_decimals), "Value out of range: values between 0 and max of token in LP");
numTokensSellToSwap = value.mul(10**_decimals);
}
function setSellBackMaxTimeForHistories(uint256 value) external onlyOwner {
require(value >= 0 && value <= 1 weeks, "Value out of range: values between 0 and 1 week in unix timestamp");
sellBackMaxTimeForHistories = value;
}
function getLeftTimeToSellForTokens(address account) external view returns (uint256) {
return _locateAccountSellHistories(account);
}
function setSwapTokensForBnbEnabled(bool _enabled) external onlyOwner {
//require(!isPreSaleEnabled, "This feature is not available during pre-sales.");
swapTokensForBnbEnabled = _enabled;
emit SwapTokensForBnbEnableUpdated(_enabled);
}
function disableFees() external onlyOwner {
//require(!isPreSaleEnabled, "This feature is not available during pre-sales.");
_disableFees();
}
function enableFees() external onlyOwner {
//require(!isPreSaleEnabled, "This feature is not available during pre-sales.");
_enableFees();
}
function totalFees() external view returns (uint256) {
return _tFeeTotal;
}
function reflectionFromToken(uint256 tAmount, bool deductTransferRewardFee) external view returns (uint256) {
require(tAmount <= _tTotalSupply, "Amount must be less than supply");
if (!deductTransferRewardFee) {
(rValues memory _rv, tValues memory _tv) = _getValues(tAmount);
_rv.rTransferAmount = 0; _rv.rRewardFee = 0; _rv.rLiquidityFee = 0;
_tv.tTransferAmount = 0; _tv.tRewardFee = 0; _tv.tLiquidityFee = 0;
return _rv.rAmount;
} else {
(rValues memory _rv, tValues memory _tv) = _getValues(tAmount);
_rv.rAmount = 0; _rv.rRewardFee = 0; _rv.rLiquidityFee = 0;
_tv.tTransferAmount = 0; _tv.tRewardFee = 0; _tv.tLiquidityFee = 0;
return _rv.rTransferAmount;
}
}
function tokenFromReflection(uint256 rAmount) public view returns (uint256) {
require(rAmount <= _rTotalSupply, "Amount must be less than total reflections");
return rAmount.div(_getRate());
}
function _approve(address owner, address spender, uint256 amount) private {
require(owner != address(0), "BEP20: approve from the zero address");
require(spender != address(0), "BEP20: approve to the zero address");
_allowances[owner][spender] = amount;
emit Approval(owner, spender, amount);
}
function _locateAccountSellHistories(address account) private view returns (uint256) {
uint256 time = 0;
for (uint256 i = 0; i < _sellHistories.length; i++) {
if (_sellHistories[i].account == account) {
time = _sellHistories[i].time;
break;
}
}
return time;
}
function _addAccountSellHistories(address account) private {
SellHistories memory sellHistory;
sellHistory.account = account;
sellHistory.time = block.timestamp;
_sellHistories.push(sellHistory);
}
function _removeOldSellHistories() private {
uint256 i = 0;
uint256 maxStartTimeForHistories = block.timestamp - sellBackMaxTimeForHistories;
for (uint256 j = 0; j < _sellHistories.length; j++) {
if (_sellHistories[j].time >= maxStartTimeForHistories) {
if (_sellHistories[j].time != _sellHistories[i].time) {
_sellHistories[i].account = _sellHistories[j].account;
_sellHistories[i].time = _sellHistories[j].time;
}
i++;
}
}
uint256 removedCnt = _sellHistories.length - i;
for (uint256 j = 0; j < removedCnt; j++) {
_sellHistories.pop();
}
}
function SwapTokensForBnb(uint256 tokenAmount) private {
// generate the uniswap pair path of token -> weth
address[] memory path = new address[](2);
path[0] = address(this);
path[1] = uniswapV2Router.WETH();
_approve(address(this), address(uniswapV2Router), tokenAmount);
// make the swap
uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(
tokenAmount,
0, // accept any amount of ETH
path,
address(this),
block.timestamp
);
}
function addLiquidity(uint256 tokenAmount, uint256 ethAmount) private {
// approve token transfer to cover all possible scenarios
_approve(address(this), address(uniswapV2Router), tokenAmount);
// add the liquidity
uniswapV2Router.addLiquidityETH{value: ethAmount}(
address(this),
tokenAmount,
0, // slippage is unavoidable
0, // slippage is unavoidable
owner(),
block.timestamp
);
}
function _tokenTransfer(address sender, address recipient, uint256 amount, bool takeFee) private {
if (!takeFee) {
_removeAllFee();
}
(rValues memory _rv, tValues memory _tv) = _getValues(amount);
_rBalances[sender] = _rBalances[sender].sub(_rv.rAmount);
_rBalances[recipient] = _rBalances[recipient].add(_rv.rTransferAmount);
_takeLiquidity(_tv.tLiquidityFee);
_reflectRewardFee(_rv.rRewardFee, _tv.tRewardFee);
emit Transfer(sender, recipient, _tv.tTransferAmount);
if (!takeFee) {
_restoreAllFee();
}
}
function _removeAllFee() private {
if (_rewardFee == 0 && _liquidityFee == 0) return;
_previousRewardFee = _rewardFee;
_previousLiquidityFee = _liquidityFee;
_rewardFee = 0;
_liquidityFee = 0;
}
function _getValues(uint256 tAmount) private view returns (rValues memory, tValues memory) {
tValues memory _tv = _getTValues(tAmount);
rValues memory _rv = _getRValues(tAmount, _tv.tRewardFee, _tv.tLiquidityFee, _getRate());
return (_rv, _tv);
}
function _getTValues(uint256 tAmount) private view returns (tValues memory) {
tValues memory _tv;
_tv.tRewardFee = _calculateRewardFee(tAmount);
_tv.tLiquidityFee = _calculateLiquidityFee(tAmount);
_tv.tTransferAmount = tAmount.sub(_tv.tRewardFee).sub(_tv.tLiquidityFee);
return _tv;
}
function _getRValues(uint256 tAmount, uint256 tRewardFee, uint256 tLiquidityFee,uint256 currentRate) private pure returns (rValues memory) {
rValues memory _rv;
_rv.rAmount = tAmount.mul(currentRate);
_rv.rRewardFee = tRewardFee.mul(currentRate);
_rv.rLiquidityFee = tLiquidityFee.mul(currentRate);
_rv.rTransferAmount = _rv.rAmount.sub(_rv.rRewardFee).sub(_rv.rLiquidityFee);
return _rv;
}
function _getRate() private view returns (uint256) {
(uint256 rSupply, uint256 tSupply) = _getCurrentSupply();
return rSupply.div(tSupply);
}
function _getCurrentSupply() private view returns (uint256, uint256) {
uint256 rSupply = _rTotalSupply;
uint256 tSupply = _tTotalSupply;
if (rSupply < _rTotalSupply.div(_tTotalSupply)) return (_rTotalSupply, _tTotalSupply);
return (rSupply, tSupply);
}
function _calculateRewardFee(uint256 _amount) private view returns (uint256) {
return _amount.mul(_rewardFee).div(10**2);
}
function _calculateLiquidityFee(uint256 _amount) private view returns (uint256) {
return _amount.mul(_liquidityFee).div(10**2);
}
function _takeLiquidity(uint256 tLiquidityFee) private {
uint256 rLiquidityFee = tLiquidityFee.mul(_getRate());
_rBalances[address(this)] = _rBalances[address(this)].add(rLiquidityFee);
_tFeeTotal = _tFeeTotal.add(tLiquidityFee);
}
function _reflectRewardFee(uint256 rRewardFee, uint256 tRewardFee) private {
_rTotalSupply = _rTotalSupply.sub(rRewardFee);
_tFeeTotal = _tFeeTotal.add(tRewardFee);
}
function _restoreAllFee() private {
_rewardFee = _previousRewardFee;
_liquidityFee = _previousLiquidityFee;
}
function _tokensInLP() private view returns (uint256) {
IUniswapV2Pair tokenLP = IUniswapV2Pair(uniswapV2Pair);
uint256 tokensInLP = 0;
if (tokenLP.totalSupply() > 0) {
(uint112 _reserve0,
uint112 _reserve1,
uint32 _blockTimestampLast) = tokenLP.getReserves();
_blockTimestampLast = 0; // to silence compiler warnings
if (tokenLP.token0() == address(this)) {
tokensInLP = _reserve0;
} else if (tokenLP.token1() == address(this)) {
tokensInLP = _reserve1;
}
}
return tokensInLP;
}
function _disableFees() private {
maxTxAmountEnabled = false;
swapTokensForBnbEnabled = false;
feesEnabled = false;
}
function _enableFees() private {
maxTxAmountEnabled = true;
swapTokensForBnbEnabled = true;
feesEnabled = true;
}
// Function Transfer
function _transfer(address from, address to, uint256 amount) private {
// prevents transfer of blocked wallets
require(!_isLockedWallet[from], "Locked addresses cannot call this function");
require(from != address(0), "BEP20: transfer from the zero address");
require(to != address(0), "BEP20: transfer to the zero address");
require(amount > 0, "Transfer amount must be greater than zero");
// sales (holder -> pair) control by time
if (to == uniswapV2Pair && from != owner() && !_isExcludedFromMax[from]) {
require(block.timestamp - _locateAccountSellHistories(from) > sellBackMaxTimeForHistories, "Sale allowed only after some hours");
}
// set _maxTxAmount to buy, sell or other action
if (from != owner() && to != owner() &&
!_isExcludedFromMax[from] && !_isExcludedFromMax[to] &&
maxTxAmountEnabled) {
if (from == uniswapV2Pair) {
// Buys only a certain percentage of the LP
/**
* here I have to trust that _tokensInLP() will never return zero,
* as the uniswap implementation would prevent this
*/
_maxTxAmount = _tokensInLP().mul(buyMaxTxAmountPercentFromLP).div(10**2);
} else if (to == uniswapV2Pair) {
// Sells only a certain percentage of the balance
_maxTxAmount = balanceOf(from).mul(sellMaxTxAmountPercentPerAccount).div(10**2);
} else if (otherMaxTxAmountPercentNoAccount > 0) {
// For other action transfer only a certain percentage of the total supply
_maxTxAmount = _tTotalSupply.mul(otherMaxTxAmountPercentNoAccount).div(10**2);
} else {
// For other action transfer the total of balance
_maxTxAmount = balanceOf(from);
}
require(amount <= _maxTxAmount, "Transfer amount exceeds the maxTxAmount.");
}
// is the token balance of this contract address over the min number of
// tokens that we need to initiate a swap + liquidity lock?
uint256 contractTokenBalance = balanceOf(address(this));
bool overMinTokenBalance = contractTokenBalance >= numTokensSellToSwap;
if (overMinTokenBalance && !_inSwapTokens &&
from != uniswapV2Pair && swapTokensForBnbEnabled) {
contractTokenBalance = numTokensSellToSwap;
}
// indicates if fee should be deducted from transfer
bool takeFee = true;
// if any account belongs to _isExcludedFromFee account or feesEnabled disabled then remove the fee
if (_isExcludedFromFee[from] || _isExcludedFromFee[to] || !feesEnabled) {
takeFee = false;
} else { // set fee to buy, sell and other transactions
if (from == uniswapV2Pair) { // Buy
_rewardFee = buyRewardFee;
_liquidityFee = buyLiquidityFee;
} else if (to == uniswapV2Pair) { // Sell
_rewardFee = sellRewardFee;
_liquidityFee = sellLiquidityFee;
} else { // other
_rewardFee = otherRewardFee;
_liquidityFee = otherLiquidityFee;
}
}
// transfer amount, it will take tax, burn, liquidity fee
_tokenTransfer(from, to, amount, takeFee);
// buys (pair -> holder) and sales (holder -> pair) control by time
if (from == uniswapV2Pair && to != owner() && !_isExcludedFromMax[to]) { // Buy
uint256 timeCtrlToBuy = _locateAccountSellHistories(to);
/**
* sale time lock valid only for the first purchase,
* from the second purchase onwards it will not be included in the record,
* if time lock expires will be add the current time,
* the investor can sell their tokens at any time the sale lock expires.
*/
if (timeCtrlToBuy == 0 || block.timestamp - timeCtrlToBuy > sellBackMaxTimeForHistories) {
_addAccountSellHistories(to);
}
} else if (to == uniswapV2Pair && from != owner() && !_isExcludedFromMax[from]) { // Sell
_addAccountSellHistories(from);
}
// clear list of the old holders
_removeOldSellHistories();
{
uint256 contractBalanceRecepient = balanceOf(to);
require(contractBalanceRecepient + amount <= _maxWalletAmount, "Transfer amount exceeds the maxWalletSize.");
}
}
event SwapTokensForBnbEnableUpdated(bool enabled);
event LockedWallet(address indexed wallet, bool locked);
event Received(address indexed from, address indexed to, uint256 amount);
event BnbFromLP(address indexed wallet, uint256 amount);
}