Contract Address Details

0x6a7330ac91A59B84423c374c32374dfb6839Aa7D

Contract Name
CentaurusMaster
Creator
0x2096af–1fba37 at 0x8235e5–04d0b1
Balance
0 VLX ( )
Tokens
Fetching tokens...
Transactions
7,282 Transactions
Transfers
18,511 Transfers
Gas Used
1,547,115,187
Last Balance Update
54220149
Contract name:
CentaurusMaster




Optimization enabled
false
Compiler version
v0.6.12+commit.27d51765




EVM Version
default




Verified at
2021-12-26 18:13:28.215407Z

Constructor Arguments

000000000000000000000000e4587c2c58ead7f927b4b58a53aa2724f238dfec00000000000000000000000000000000000000000000000000b1a2bc2ec500000000000000000000000000000000000000000000000000000000000061d347b0

Arg [0] (address) : 0xe4587c2c58ead7f927b4b58a53aa2724f238dfec
Arg [1] (uint256) : 50000000000000000
Arg [2] (uint256) : 1641236400

              

Contract source code

/*
Centaurus.Network on Velas Blockchain
- https://cen.centaurus.network/
- https://twitter.com/centaurusnet
- https://t.me/centaurusnetwork
*/
// SPDX-License-Identifier: UNLICENSED
/**
* @title SafeBEP20
* @dev Wrappers around BEP20 operations that throw on failure (when the token
* contract returns false). Tokens that return no value (and instead revert or
* throw on failure) are also supported, non-reverting calls are assumed to be
* successful.
* To use this library you can add a `using SafeBEP20 for IBEP20;` statement to your contract,
* which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
*/
library SafeBEP20 {
using SafeMath for uint256;
using Address for address;
function safeTransfer(IBEP20 token, address to, uint256 value) internal {
_callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
}
function safeTransferFrom(IBEP20 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
* {IBEP20-approve}, and its usage is discouraged.
*
* Whenever possible, use {safeIncreaseAllowance} and
* {safeDecreaseAllowance} instead.
*/
function safeApprove(IBEP20 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'
// solhint-disable-next-line max-line-length
require((value == 0) || (token.allowance(address(this), spender) == 0),
"SafeBEP20: approve from non-zero to non-zero allowance"
);
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
}
function safeIncreaseAllowance(IBEP20 token, address spender, uint256 value) internal {
uint256 newAllowance = token.allowance(address(this), spender).add(value);
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
}
function safeDecreaseAllowance(IBEP20 token, address spender, uint256 value) internal {
uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeBEP20: decreased allowance below zero");
_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(IBEP20 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, "SafeBEP20: low-level call failed");
if (returndata.length > 0) { // Return data is optional
// solhint-disable-next-line max-line-length
require(abi.decode(returndata, (bool)), "SafeBEP20: BEP20 operation did not succeed");
}
}
}
pragma solidity 0.6.12;
//
/*
* @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 GSN 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 payable) {
return msg.sender;
}
function _msgData() internal view virtual returns (bytes memory) {
this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
return msg.data;
}
}
//
/**
* @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 () internal {
address msgSender = _msgSender();
_owner = msgSender;
emit OwnershipTransferred(address(0), 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 {
emit OwnershipTransferred(_owner, address(0));
_owner = 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");
emit OwnershipTransferred(_owner, newOwner);
_owner = newOwner;
}
}
//
interface IBEP20 {
/**
* @dev Returns the amount of tokens in existence.
*/
function totalSupply() external view returns (uint256);
/**
* @dev Returns the token decimals.
*/
function decimals() external view returns (uint8);
/**
* @dev Returns the token symbol.
*/
function symbol() external view returns (string memory);
/**
* @dev Returns the token name.
*/
function name() external view returns (string memory);
/**
* @dev Returns the bep token owner.
*/
function getOwner() external view returns (address);
/**
* @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);
}
//
/**
* @dev Wrappers over Solidity's arithmetic operations with added overflow
* checks.
*
* Arithmetic operations in Solidity wrap on overflow. This can easily result
* in bugs, because programmers usually assume that an overflow raises an
* error, which is the standard behavior in high level programming languages.
* `SafeMath` restores this intuition by reverting the transaction when an
* operation overflows.
*
* Using this library instead of the unchecked operations eliminates an entire
* class of bugs, so it's recommended to use it always.
*/
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) {
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) {
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) {
// 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) {
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) {
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) {
uint256 c = a + b;
require(c >= a, "SafeMath: addition overflow");
return c;
}
/**
* @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) {
require(b <= a, "SafeMath: subtraction overflow");
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) {
if (a == 0) return 0;
uint256 c = a * b;
require(c / a == b, "SafeMath: multiplication overflow");
return c;
}
/**
* @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. 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) internal pure returns (uint256) {
require(b > 0, "SafeMath: division by zero");
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) {
require(b > 0, "SafeMath: modulo by zero");
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) {
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.
*
* CAUTION: This function is deprecated because it requires allocating memory for the error
* message unnecessarily. For custom revert reasons use {tryDiv}.
*
* 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) {
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) {
require(b > 0, errorMessage);
return a % b;
}
}
//
/**
* @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;
// solhint-disable-next-line no-inline-assembly
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");
// solhint-disable-next-line avoid-low-level-calls, avoid-call-value
(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");
// solhint-disable-next-line avoid-low-level-calls
(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");
// solhint-disable-next-line avoid-low-level-calls
(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");
// solhint-disable-next-line avoid-low-level-calls
(bool success, bytes memory returndata) = target.delegatecall(data);
return _verifyCallResult(success, returndata, errorMessage);
}
function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private 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
// solhint-disable-next-line no-inline-assembly
assembly {
let returndata_size := mload(returndata)
revert(add(32, returndata), returndata_size)
}
} else {
revert(errorMessage);
}
}
}
}
//
/**
* @dev Implementation of the {IBEP20} interface.
*
* This implementation is agnostic to the way tokens are created. This means
* that a supply mechanism has to be added in a derived contract using {_mint}.
* For a generic mechanism see {BEP20PresetMinterPauser}.
*
* TIP: For a detailed writeup see our guide
* https://forum.zeppelin.solutions/t/how-to-implement-BEP20-supply-mechanisms/226[How
* to implement supply mechanisms].
*
* We have followed general OpenZeppelin guidelines: functions revert instead
* of returning `false` on failure. This behavior is nonetheless conventional
* and does not conflict with the expectations of BEP20 applications.
*
* Additionally, an {Approval} event is emitted on calls to {transferFrom}.
* This allows applications to reconstruct the allowance for all accounts just
* by listening to said events. Other implementations of the EIP may not emit
* these events, as it isn't required by the specification.
*
* Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
* functions have been added to mitigate the well-known issues around setting
* allowances. See {IBEP20-approve}.
*/
contract BEP20 is Context, IBEP20, Ownable {
using SafeMath for uint256;
using Address for address;
mapping(address => uint256) private _balances;
mapping(address => mapping(address => uint256)) private _allowances;
uint256 private _totalSupply;
string private _name;
string private _symbol;
uint8 private _decimals;
/**
* @dev Sets the values for {name} and {symbol}, initializes {decimals} with
* a default value of 18.
*
* To select a different value for {decimals}, use {_setupDecimals}.
*
* All three of these values are immutable: they can only be set once during
* construction.
*/
constructor(string memory name, string memory symbol) public {
_name = name;
_symbol = symbol;
_decimals = 18;
}
/**
* @dev Returns the bep token owner.
*/
function getOwner() external override view returns (address) {
return owner();
}
/**
* @dev Returns the token name.
*/
function name() public override view returns (string memory) {
return _name;
}
/**
* @dev Returns the token decimals.
*/
function decimals() public override view returns (uint8) {
return _decimals;
}
/**
* @dev Returns the token symbol.
*/
function symbol() public override view returns (string memory) {
return _symbol;
}
/**
* @dev See {BEP20-totalSupply}.
*/
function totalSupply() public override view returns (uint256) {
return _totalSupply;
}
/**
* @dev See {BEP20-balanceOf}.
*/
function balanceOf(address account) public override view returns (uint256) {
return _balances[account];
}
/**
* @dev See {BEP20-transfer}.
*
* Requirements:
*
* - `recipient` cannot be the zero address.
* - the caller must have a balance of at least `amount`.
*/
function transfer(address recipient, uint256 amount) public override returns (bool) {
_transfer(_msgSender(), recipient, amount);
return true;
}
/**
* @dev See {BEP20-allowance}.
*/
function allowance(address owner, address spender) public override view returns (uint256) {
return _allowances[owner][spender];
}
/**
* @dev See {BEP20-approve}.
*
* Requirements:
*
* - `spender` cannot be the zero address.
*/
function approve(address spender, uint256 amount) public override returns (bool) {
_approve(_msgSender(), spender, amount);
return true;
}
/**
* @dev See {BEP20-transferFrom}.
*
* Emits an {Approval} event indicating the updated allowance. This is not
* required by the EIP. See the note at the beginning of {BEP20};
*
* Requirements:
* - `sender` and `recipient` cannot be the zero address.
* - `sender` must have a balance of at least `amount`.
* - the caller must have allowance for `sender`'s tokens of at least
* `amount`.
*/
function transferFrom(
address sender,
address recipient,
uint256 amount
) public override returns (bool) {
_transfer(sender, recipient, amount);
_approve(
sender,
_msgSender(),
_allowances[sender][_msgSender()].sub(amount, "BEP20: transfer amount exceeds allowance")
);
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 {BEP20-approve}.
*
* Emits an {Approval} event indicating the updated allowance.
*
* Requirements:
*
* - `spender` cannot be the zero address.
*/
function increaseAllowance(address spender, uint256 addedValue) public returns (bool) {
_approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(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 {BEP20-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 returns (bool) {
_approve(
_msgSender(),
spender,
_allowances[_msgSender()][spender].sub(subtractedValue, "BEP20: decreased allowance below zero")
);
return true;
}
/**
* @dev Creates `amount` tokens and assigns them to `msg.sender`, increasing
* the total supply.
*
* Requirements
*
* - `msg.sender` must be the token owner
*/
function mint(uint256 amount) public onlyOwner returns (bool) {
_mint(_msgSender(), amount);
return true;
}
/**
* @dev Moves tokens `amount` from `sender` to `recipient`.
*
* This is 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:
*
* - `sender` cannot be the zero address.
* - `recipient` cannot be the zero address.
* - `sender` must have a balance of at least `amount`.
*/
function _transfer(
address sender,
address recipient,
uint256 amount
) internal virtual {
require(sender != address(0), "BEP20: transfer from the zero address");
require(recipient != address(0), "BEP20: transfer to the zero address");
_balances[sender] = _balances[sender].sub(amount, "BEP20: transfer amount exceeds balance");
_balances[recipient] = _balances[recipient].add(amount);
emit Transfer(sender, recipient, amount);
}
/** @dev Creates `amount` tokens and assigns them to `account`, increasing
* the total supply.
*
* Emits a {Transfer} event with `from` set to the zero address.
*
* Requirements
*
* - `to` cannot be the zero address.
*/
function _mint(address account, uint256 amount) internal {
require(account != address(0), "BEP20: mint to the zero address");
_totalSupply = _totalSupply.add(amount);
_balances[account] = _balances[account].add(amount);
emit Transfer(address(0), account, amount);
}
/**
* @dev Destroys `amount` tokens from `account`, reducing the
* total supply.
*
* Emits a {Transfer} event with `to` set to the zero address.
*
* Requirements
*
* - `account` cannot be the zero address.
* - `account` must have at least `amount` tokens.
*/
function _burn(address account, uint256 amount) internal {
require(account != address(0), "BEP20: burn from the zero address");
_balances[account] = _balances[account].sub(amount, "BEP20: burn amount exceeds balance");
_totalSupply = _totalSupply.sub(amount);
emit Transfer(account, address(0), amount);
}
/**
* @dev Sets `amount` as the allowance of `spender` over the `owner`s tokens.
*
* This is 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 {
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);
}
/**
* @dev Destroys `amount` tokens from `account`.`amount` is then deducted
* from the caller's allowance.
*
* See {_burn} and {_approve}.
*/
function _burnFrom(address account, uint256 amount) internal {
_burn(account, amount);
_approve(
account,
_msgSender(),
_allowances[account][_msgSender()].sub(amount, "BEP20: burn amount exceeds allowance")
);
}
}
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);
}
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;
}
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;
}
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;
}
/**
* @dev Contract module that helps prevent reentrant calls to a function.
*
* Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
* available, which can be applied to functions to make sure there are no nested
* (reentrant) calls to them.
*
* Note that because there is a single `nonReentrant` guard, functions marked as
* `nonReentrant` may not call one another. This can be worked around by making
* those functions `private`, and then adding `external` `nonReentrant` entry
* points to them.
*
* TIP: If you would like to learn more about reentrancy and alternative ways
* to protect against it, check out our blog post
* https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
*/
abstract contract ReentrancyGuard {
// Booleans are more expensive than uint256 or any type that takes up a full
// word because each write operation emits an extra SLOAD to first read the
// slot's contents, replace the bits taken up by the boolean, and then write
// back. This is the compiler's defense against contract upgrades and
// pointer aliasing, and it cannot be disabled.
// The values being non-zero value makes deployment a bit more expensive,
// but in exchange the refund on every call to nonReentrant will be lower in
// amount. Since refunds are capped to a pershieldtage of the total
// transaction's gas, it is best to keep them low in cases like this one, to
// increase the likelihood of the full refund coming into effect.
uint256 private constant _NOT_ENTERED = 1;
uint256 private constant _ENTERED = 2;
uint256 private _status;
constructor () internal {
_status = _NOT_ENTERED;
}
/**
* @dev Prevents a contract from calling itself, directly or indirectly.
* Calling a `nonReentrant` function from another `nonReentrant`
* function is not supported. It is possible to prevent this from happening
* by making the `nonReentrant` function external, and make it call a
* `private` function that does the actual work.
*/
modifier nonReentrant() {
// On the first call to nonReentrant, _notEntered will be true
require(_status != _ENTERED, "ReentrancyGuard: reentrant call");
// Any calls to nonReentrant after this point will fail
_status = _ENTERED;
_;
// By storing the original value once again, a refund is triggered (see
// https://eips.ethereum.org/EIPS/eip-2200)
_status = _NOT_ENTERED;
}
}
// The Reward Token.
contract Token is BEP20 {
// Transfer tax rate in basis points. (default 3%)
uint16 public transferTaxRate = 300;
// Burn Fee, in percent of transferTaxRate.
uint16 public burnFee = 20;
// Liq Fee, in percent of transferTaxRate.
uint16 public liqFee = 100 - burnFee;
// Max transfer tax rate: 5%.
uint16 public constant maxTaxRate = 500;
// Fee address
address payable public feeAddr = 0x45472B519de9Ac90A09BF51d9E161B8C6476361D;
// Burn address
address public constant brunAddr = 0x000000000000000000000000000000000000dEaD;
// Max transfer amount rate in basis points. (default is 2.5% of total supply)
uint16 public maxTransferAmountRate = 250;
// Addresses that excluded from antiWhale
mapping(address => bool) private _excludedFromAntiWhale;
// Addresses that excluded from transferTax when sending
mapping(address => bool) private _excludedFromTaxSender;
// Addresses that excluded from transferTax when receiving
mapping(address => bool) private _excludedFromTaxReceiver;
// Automatic swap and liquify enabled
bool public swapAndLiquifyEnabled = false;
// Min amount to liquify. (default 10 TOKENs)
uint256 public minAmountToLiquify = 50 ether;
// The swap router, modifiable.
IUniswapV2Router02 public swapRouter;
// The trading pair
address public swapPair;
// In swap and liquify
bool private _inSwapAndLiquify;
// The operator can call all functions except of minting TOKEN
address private _operator;
// The lpEarner address will be set to an Earning Contract which
// will distribute Token-wVLX LP token to Stakers!
address private lpEarner;
// Events
event OperatorTransferred(address indexed previousOperator, address indexed newOperator);
event TransferTaxRateUpdated(address indexed operator, uint256 previousRate, uint256 newRate);
event BurnFeeUpdated(address indexed operator, uint256 previousRate, uint256 newRate);
event LiqFeeUpdated(address indexed operator, uint256 previousRate, uint256 newRate);
event MaxTransferAmountRateUpdated(address indexed operator, uint256 previousRate, uint256 newRate);
event SwapAndLiquifyEnabledUpdated(address indexed operator, bool enabled);
event MinAmountToLiquifyUpdated(address indexed operator, uint256 previousAmount, uint256 newAmount);
event SwapRouterUpdated(address indexed operator, address indexed router, address indexed pair);
event SetNoTaxSenderAddr(address indexed operator, address indexed noTaxSenderAddr);
event SetNoTaxRecipientAddr(address indexed operator, address indexed noTaxRecipientAddr);
event SetLpEarnerAddr(address indexed operator, address indexed SetLpEarnerAddr);
event SwapAndLiquify(uint256 tokensSwapped, uint256 ethReceived, uint256 tokensIntoLiqudity);
modifier onlyOperator() {
require(_operator == msg.sender, "operator: caller is not the operator");
_;
}
modifier antiWhale(address sender, address recipient, uint256 amount) {
if (maxTransferAmount() > 0) {
if (
_excludedFromAntiWhale[sender] == false
&& _excludedFromAntiWhale[recipient] == false
) {
require(amount <= maxTransferAmount(), "TOKEN::antiWhale: Transfer amount exceeds the maxTransferAmount");
}
}
_;
}
modifier lockTheSwap {
_inSwapAndLiquify = true;
_;
_inSwapAndLiquify = false;
}
modifier transferTaxFree {
uint16 _transferTaxRate = transferTaxRate;
transferTaxRate = 0;
_;
transferTaxRate = _transferTaxRate;
}
/**
* @notice Constructs the Reward Token contract.
*/
constructor() public BEP20("CENTAURUS cen.centaurus.network", "CEN") {
_operator = _msgSender();
lpEarner = _msgSender();
emit OperatorTransferred(address(0), _operator);
_excludedFromAntiWhale[msg.sender] = true;
_excludedFromAntiWhale[address(0)] = true;
_excludedFromAntiWhale[address(this)] = true;
_excludedFromAntiWhale[brunAddr] = true;
_excludedFromTaxSender[msg.sender] = true;
_excludedFromTaxSender[brunAddr] = true;
_excludedFromTaxSender[feeAddr] = true;
_excludedFromTaxReceiver[msg.sender] = true;
_excludedFromTaxReceiver[brunAddr] = true;
_excludedFromTaxReceiver[feeAddr] = true;
}
// Creates `_amount` token to `_to`. Must only be called by the owner (MasterChef).
function mint(address _to, uint256 _amount) public onlyOwner {
_mint(_to, _amount);
}
// transfer function to meet tokenomics of TOKEN
function _transfer(address sender, address recipient, uint256 amount) internal virtual override antiWhale(sender, recipient, amount) {
// swap and liquify
if (swapAndLiquifyEnabled == true
&& _inSwapAndLiquify == false
&& address(swapRouter) != address(0)
&& swapPair != address(0)
&& sender != swapPair // excludes Buying from BNB Liquidity
&& sender != owner() // excludes owner (later MasterChef)
) { swapAndLiquify(); }
bool _isNonTaxedSender = isExcludedFromTaxSender(sender);
bool _isNonTaxedReceipient = isExcludedFromTaxReceiver(recipient);
if (_isNonTaxedSender || _isNonTaxedReceipient || transferTaxRate == 0 ) {
super._transfer(sender, recipient, amount); // transfer with no Tax
} else {
// default tax is 3% of every transfer
uint256 taxAmount = amount.mul(transferTaxRate).div(10000);
uint256 burnAmount = taxAmount.mul(burnFee).div(100);
uint256 liqAmount = taxAmount.sub(burnAmount);
require(taxAmount == burnAmount + liqAmount, "TOKEN::transfer: Burn value invalid");
// default 97% of transfer sent to recipient
uint256 sendAmount = amount.sub(taxAmount);
require(amount == sendAmount + taxAmount, "TOKEN::transfer: Tax value invalid");
super._transfer(sender, brunAddr, burnAmount);
super._transfer(sender, address(this), liqAmount);
super._transfer(sender, recipient, sendAmount);
amount = sendAmount;
}
}
// Swap and liquify
function swapAndLiquify() private lockTheSwap transferTaxFree {
uint256 contractTokenBalance = balanceOf(address(this));
uint256 maxTransferAmount = maxTransferAmount();
contractTokenBalance = contractTokenBalance > maxTransferAmount ? maxTransferAmount : contractTokenBalance;
if (contractTokenBalance >= minAmountToLiquify) {
// only min amount to liquify
uint256 liquifyAmount = minAmountToLiquify;
// split the liquify amount into halves
uint256 half = liquifyAmount.div(2);
uint256 otherHalf = liquifyAmount.sub(half.mul(80).div(100));
// swap tokens for ETH
swapTokensForEth(half);
// send 20% ETH to the Fee Wallet
feeAddr.transfer(address(this).balance.mul(20).div(100));
// how much ETH is in the token contract
uint256 newBalance = address(this).balance;
// add liquidity
addLiquidity(otherHalf, newBalance);
emit SwapAndLiquify(half, newBalance, otherHalf);
}
}
/// @dev Swap tokens for eth
function swapTokensForEth(uint256 tokenAmount) private {
// generate the token -> weth path for swapping
address[] memory path = new address[](2);
path[0] = address(this);
path[1] = swapRouter.WETH();
_approve(address(this), address(swapRouter), tokenAmount);
// make the swap
swapRouter.swapExactTokensForETHSupportingFeeOnTransferTokens(
tokenAmount,
0, // accept any amount of ETH
path,
address(this),
block.timestamp
);
}
/// @dev Add liquidity
function addLiquidity(uint256 tokenAmount, uint256 ethAmount) private {
// approve token transfer to cover all possible scenarios
_approve(address(this), address(swapRouter), tokenAmount);
// add the liquidity
swapRouter.addLiquidityETH{value: ethAmount}(
address(this),
tokenAmount,
0, // slippage is unavoidable
0, // slippage is unavoidable
viewLpEarner(),
block.timestamp
);
}
// Returns the max transfer amount.
function maxTransferAmount() public view returns (uint256) {
return totalSupply().mul(maxTransferAmountRate).div(10000);
}
// Returns if the address is excluded from antiWhale or not.
function isExcludedFromAntiWhale(address _account) public view returns (bool) {
return _excludedFromAntiWhale[_account];
}
// Returns if the address is excluded from Tax or not when sendng.
function isExcludedFromTaxSender(address _account) public view returns (bool) {
return _excludedFromTaxSender[_account];
}
// Returns if the address is excluded from Tax or not when receiving.
function isExcludedFromTaxReceiver(address _account) public view returns (bool) {
return _excludedFromTaxReceiver[_account];
}
// To receive BNB from swapRouter when swapping
receive() external payable {}
// Update the transfer tax rate.
function updateTransferTaxRate(uint16 _transferTaxRate) public onlyOperator {
require(_transferTaxRate <= maxTaxRate, "TOKEN::updateTransferTaxRate: Transfer tax rate must not exceed the maximum rate.");
emit TransferTaxRateUpdated(msg.sender, transferTaxRate, _transferTaxRate);
transferTaxRate = _transferTaxRate;
}
// Update the Burn Fee
function updateBurnFee(uint16 _burnFee) public onlyOperator {
require(_burnFee <= 100, "TOKEN::updateBurnRate: Burn Fee must not exceed the maximum rate.");
emit BurnFeeUpdated(msg.sender, burnFee, _burnFee);
burnFee = _burnFee;
}
// Update the max transfer amount rate
function updateMaxTransferAmountRate(uint16 _maxTransferAmountRate) public onlyOperator {
require(_maxTransferAmountRate <= 1000, "TOKEN::updateMaxTransferAmountRate: Max transfer amount to High.");
require(_maxTransferAmountRate >= 100, "TOKEN::updateMaxTransferAmountRate: Min transfer amount to Low.");
emit MaxTransferAmountRateUpdated(msg.sender, maxTransferAmountRate, _maxTransferAmountRate);
maxTransferAmountRate = _maxTransferAmountRate;
}
// Update the min amount to liquify
function updateMinAmountToLiquify(uint256 _minAmount) public onlyOperator {
emit MinAmountToLiquifyUpdated(msg.sender, minAmountToLiquify, _minAmount);
minAmountToLiquify = _minAmount;
}
// Set address to be in- or excluded from anti Whale
function setExcludedFromAntiWhale(address _account, bool _excluded) public onlyOperator {
_excludedFromAntiWhale[_account] = _excluded;
}
// Set address to be in- or excluded from Tax when sending
function setExcludedFromTaxSender(address _account, bool _excluded) public onlyOperator {
_excludedFromTaxSender[_account] = _excluded;
}
// Set address to be in- or excluded from Tax when receiving
function setExcludedFromTaxReceiver(address _account, bool _excluded) public onlyOperator {
_excludedFromTaxReceiver[_account] = _excluded;
}
// Update the swapAndLiquifyEnabled.
function updateSwapAndLiquifyEnabled(bool _enabled) public onlyOperator {
emit SwapAndLiquifyEnabledUpdated(msg.sender, _enabled);
swapAndLiquifyEnabled = _enabled;
}
// Update the swap router
function updateSwapRouter(address _router) public onlyOperator {
swapRouter = IUniswapV2Router02(_router);
swapPair = IUniswapV2Factory(swapRouter.factory()).getPair(address(this), swapRouter.WETH());
require(swapPair != address(0), "TOKEN::updateSwapRouter: Invalid pair address.");
emit SwapRouterUpdated(msg.sender, address(swapRouter), swapPair);
}
// function to view the current operator address
function operator() public view returns (address) {
return _operator;
}
// function to view the current receiving address of the created LPs
function viewLpEarner() public view returns (address) {
return lpEarner;
}
// function to set the receiving address of the created LPs
function setLpEarnerAddr(address _lpEarner) public onlyOperator {
lpEarner = _lpEarner;
emit SetLpEarnerAddr(msg.sender, _lpEarner);
}
// function to withdraw ETH from this Contract
function withdrawEth() public onlyOperator {
require(address(this).balance > 0, "withdrawEth: No ETH balance");
msg.sender.transfer(address(this).balance);
}
// function to withdraw any Token from this Contract
function withdrawToken(address _token, uint256 _amount) public onlyOperator {
BEP20(_token).transfer(msg.sender, _amount);
}
// Transfers operator of the contract to a new account (`newOperator`).
function transferOperator(address newOperator) public onlyOperator {
require(newOperator != address(0), "TOKEN::transferOperator: new operator is the zero address");
emit OperatorTransferred(_operator, newOperator);
_operator = newOperator;
}
}
// The MasterChef is the master of the reward Tokens. He can make Tokens and he is a fair guy.
//
// Have fun reading it. Hopefully it's bug-free. God bless.
contract CentaurusMaster is Ownable, ReentrancyGuard {
using SafeBEP20 for IBEP20;
// Info of each user.
struct UserInfo {
uint256 amount; // How many LP tokens the user has provided.
uint256 rewardDebt; // Reward debt. See explanation below.
//
// We do some fancy math here. Basically, any point in time, the amount of Token
// entitled to a user but is pending to be distributed is:
//
// pending reward = (user.amount * pool.accTokenPerShare) - user.rewardDebt
//
// Whenever a user deposits or withdraws LP tokens to a pool. Here's what happens:
// 1. The pool's `accTokenPerShare` (and `lastRewardTime`) gets updated.
// 2. User receives the pending reward sent to his/her address.
// 3. User's `amount` gets updated.
// 4. User's `rewardDebt` gets updated.
}
// Info of each pool.
struct PoolInfo {
IBEP20 lpToken; // Address of LP Token contract.
uint256 allocPoint; // How many allocation points assigned to this pool. Tokens to distribute per second.
uint256 lastRewardTime; // Last timestamp that Tokens distribution occurs.
uint256 accTokenPerShare; // Accumulated Tokens per share, times 1e18. See below.
uint16 depositFeeBP; // Deposit fee in basis points
uint256 lpSupply;
}
// The Reward Token!
Token public token;
// Dev address.
address public devaddr = 0x2096aFDaA68EEaE1EbF95DFdf565eE6d9B1fbA37;
// Deposit Fee address
address public feeaddr = 0x45472B519de9Ac90A09BF51d9E161B8C6476361D;
// Token tokens created per timestamp.
uint256 public tokenPerSecond;
// Info of each pool.
PoolInfo[] public poolInfo;
// Info of each user that stakes LP tokens.
mapping(uint256 => mapping(address => UserInfo)) public userInfo;
// Total allocation points. Must be the sum of all allocation points in all pools.
uint256 public totalAllocPoint = 0;
// The timestamp when Tokens mining starts.
uint256 public startTime;
// Maximum tokenPerSecond
uint256 public MAX_EMISSION_RATE = 0.1 ether;
event Deposit(address indexed user, uint256 indexed pid, uint256 amount);
event Withdraw(address indexed user, uint256 indexed pid, uint256 amount);
event EmergencyWithdraw(address indexed user, uint256 indexed pid, uint256 amount);
event SetFeeAddress(address indexed user, address indexed newAddress);
event SetDevAddress(address indexed user, address indexed newAddress);
event UpdateEmissionRate(address indexed user, uint256 tokenPerSecond);
event addPool(uint256 indexed pid, address lpToken, uint256 allocPoint, uint256 depositFeeBP);
event setPool(uint256 indexed pid, address lpToken, uint256 allocPoint, uint256 depositFeeBP);
event UpdateStartTime(uint256 newStartBlock);
event tokenMintError(bytes reason);
constructor (
Token _tokenAddress,
uint256 _tokenPerSecond,
uint256 _startTime
) public {
require(_startTime >= block.timestamp, "Starting time cannot be set in the past.");
require(_tokenPerSecond < MAX_EMISSION_RATE, "Emission rate cannot be more than the maximum.");
token = _tokenAddress;
tokenPerSecond = _tokenPerSecond;
startTime = _startTime;
}
function poolLength() external view returns (uint256) {
return poolInfo.length;
}
mapping(IBEP20 => bool) public poolExistence;
modifier nonDuplicated(IBEP20 _lpToken) {
require(poolExistence[_lpToken] == false, "nonDuplicated: duplicated");
_;
}
// Add a new lp to the pool. Can only be called by the owner.
function add(uint256 _allocPoint, IBEP20 _lpToken, uint16 _depositFeeBP, bool _withUpdate) external onlyOwner nonDuplicated(_lpToken) {
_lpToken.balanceOf(address(this)); // valid ERC20 token
require(_depositFeeBP <= 400, "add: invalid deposit fee basis points");
if (_withUpdate) {
massUpdatePools();
}
uint256 lastRewardTime = block.timestamp > startTime ? block.timestamp : startTime;
totalAllocPoint = totalAllocPoint + _allocPoint;
poolExistence[_lpToken] = true;
poolInfo.push(
PoolInfo({
lpToken : _lpToken,
allocPoint : _allocPoint,
lastRewardTime : lastRewardTime,
accTokenPerShare : 0,
depositFeeBP : _depositFeeBP,
lpSupply: 0
})
);
emit addPool(poolInfo.length - 1, address(_lpToken), _allocPoint, _depositFeeBP);
}
// Update the given pool's Token allocation point and deposit fee. Can only be called by the owner.
function set(uint256 _pid, uint256 _allocPoint, uint16 _depositFeeBP, bool _withUpdate) external onlyOwner {
require(_depositFeeBP <= 400, "set: invalid deposit fee basis points");
if (_withUpdate) {
massUpdatePools();
}
totalAllocPoint = totalAllocPoint - poolInfo[_pid].allocPoint + _allocPoint;
poolInfo[_pid].allocPoint = _allocPoint;
poolInfo[_pid].depositFeeBP = _depositFeeBP;
emit setPool(_pid, address(poolInfo[_pid].lpToken), _allocPoint, _depositFeeBP);
}
// Return reward multiplier over the given _from to _to timestamp.
function getMultiplier(uint256 _from, uint256 _to) public pure returns (uint256) {
return _to - _from;
}
// View function to see pending Token on frontend.
function pendingToken(uint256 _pid, address _user) external view returns (uint256) {
PoolInfo storage pool = poolInfo[_pid];
UserInfo storage user = userInfo[_pid][_user];
uint256 accTokenPerShare = pool.accTokenPerShare;
if (block.timestamp > pool.lastRewardTime && pool.lpSupply != 0 && totalAllocPoint > 0) {
uint256 multiplier = getMultiplier(pool.lastRewardTime, block.timestamp);
uint256 tokenReward = multiplier * tokenPerSecond * pool.allocPoint / totalAllocPoint;
accTokenPerShare = accTokenPerShare + tokenReward * 1e18 / pool.lpSupply;
}
return user.amount * accTokenPerShare / 1e18 - user.rewardDebt;
}
// Update reward variables for all pools. Be careful of gas spending!
function massUpdatePools() public {
uint256 length = poolInfo.length;
for (uint256 pid = 0; pid < length; ++pid) {
updatePool(pid);
}
}
// Update reward variables of the given pool to be up-to-date.
function updatePool(uint256 _pid) public {
PoolInfo storage pool = poolInfo[_pid];
if (block.timestamp <= pool.lastRewardTime) {
return;
}
if (pool.lpSupply == 0 || pool.allocPoint == 0) {
pool.lastRewardTime = block.timestamp;
return;
}
uint256 multiplier = getMultiplier(pool.lastRewardTime, block.timestamp);
uint256 tokenReward = multiplier * tokenPerSecond * pool.allocPoint / totalAllocPoint;
try token.mint(devaddr, tokenReward / 20) {
} catch (bytes memory reason) {
tokenReward = 0;
emit tokenMintError(reason);
}
try token.mint(address(this), tokenReward) {
} catch (bytes memory reason) {
tokenReward = 0;
emit tokenMintError(reason);
}
pool.accTokenPerShare = pool.accTokenPerShare + tokenReward * 1e18 / pool.lpSupply;
pool.lastRewardTime = block.timestamp;
}
// Deposit LP tokens to MasterChef for Token allocation.
function deposit(uint256 _pid, uint256 _amount) external nonReentrant {
PoolInfo storage pool = poolInfo[_pid];
UserInfo storage user = userInfo[_pid][msg.sender];
updatePool(_pid);
if (user.amount > 0) {
uint256 pending = user.amount * pool.accTokenPerShare / 1e18 - user.rewardDebt;
if (pending > 0) {
safeTokenTransfer(msg.sender, pending);
}
}
if (_amount > 0) {
uint256 balanceBefore = pool.lpToken.balanceOf(address(this));
pool.lpToken.safeTransferFrom(address(msg.sender), address(this), _amount);
_amount = pool.lpToken.balanceOf(address(this)) - balanceBefore;
if (pool.depositFeeBP > 0) {
uint256 depositFee = _amount * pool.depositFeeBP / 10000;
pool.lpToken.safeTransfer(feeaddr, depositFee);
user.amount = user.amount + _amount - depositFee;
pool.lpSupply = pool.lpSupply + _amount - depositFee;
} else {
user.amount = user.amount + _amount;
pool.lpSupply = pool.lpSupply + _amount;
}
}
user.rewardDebt = user.amount * pool.accTokenPerShare / 1e18;
emit Deposit(msg.sender, _pid, _amount);
}
// Withdraw LP tokens from MasterChef.
function withdraw(uint256 _pid, uint256 _amount) external nonReentrant {
PoolInfo storage pool = poolInfo[_pid];
UserInfo storage user = userInfo[_pid][msg.sender];
require(user.amount >= _amount, "withdraw: not good");
updatePool(_pid);
uint256 pending = user.amount * pool.accTokenPerShare / 1e18 - user.rewardDebt;
if (pending > 0) {
safeTokenTransfer(msg.sender, pending);
}
if (_amount > 0) {
user.amount = user.amount - _amount;
pool.lpToken.safeTransfer(address(msg.sender), _amount);
pool.lpSupply = pool.lpSupply - _amount;
}
user.rewardDebt = user.amount * pool.accTokenPerShare / 1e18;
emit Withdraw(msg.sender, _pid, _amount);
}
// Withdraw without caring about rewards. EMERGENCY ONLY.
function emergencyWithdraw(uint256 _pid) external nonReentrant {
PoolInfo storage pool = poolInfo[_pid];
UserInfo storage user = userInfo[_pid][msg.sender];
uint256 amount = user.amount;
user.amount = 0;
user.rewardDebt = 0;
pool.lpToken.safeTransfer(address(msg.sender), amount);
if (pool.lpSupply >= amount) {
pool.lpSupply = pool.lpSupply - amount;
} else {
pool.lpSupply = 0;
}
emit EmergencyWithdraw(msg.sender, _pid, amount);
}
// Safe Token transfer function, just in case if rounding error causes pool to not have enough Token.
function safeTokenTransfer(address _to, uint256 _amount) internal {
uint256 tokenBal = token.balanceOf(address(this));
bool transferSuccess = false;
if (_amount > tokenBal) {
transferSuccess = token.transfer(_to, tokenBal);
} else {
transferSuccess = token.transfer(_to, _amount);
}
require(transferSuccess, "safeTokenTransfer: transfer failed");
}
// Update dev address.
function setDevAddress(address _devaddr) external {
require(msg.sender == devaddr, "setDevAddress: ACCESS DENIED");
require(_devaddr != address(0), "setDevAddress: INCORRECT INPUT");
devaddr = _devaddr;
emit SetDevAddress(msg.sender, _devaddr);
}
function setFeeAddress(address _feeAddress) external {
require(msg.sender == feeaddr, "setFeeAddress: ACCESS DENIED");
require(_feeAddress != address(0), "setFeeAddress: INCORRECT INPUT");
feeaddr = _feeAddress;
emit SetFeeAddress(msg.sender, _feeAddress);
}
// Pancake has to add hidden dummy pools inorder to alter the emission, here we make it simple and transparent to all.
function updateEmissionRate(uint256 _tokenPerSecond) external onlyOwner {
require(_tokenPerSecond <= MAX_EMISSION_RATE, "INCORRECT INPUT");
massUpdatePools();
tokenPerSecond = _tokenPerSecond;
emit UpdateEmissionRate(msg.sender, _tokenPerSecond);
}
// Only update before start of farm
function updateStartTime(uint256 _newStartTime) external onlyOwner {
require(block.timestamp < startTime, "FARM ALREADY STARTED");
require(block.timestamp < _newStartTime, "INCORRECT INPUT");
uint256 length = poolInfo.length;
for (uint256 pid = 0; pid < length; ++pid) {
PoolInfo storage pool = poolInfo[pid];
pool.lastRewardTime = _newStartTime;
}
startTime = _newStartTime;
emit UpdateStartTime(startTime);
}
}

Contract ABI

[{"type":"constructor","stateMutability":"nonpayable","inputs":[{"type":"address","name":"_tokenAddress","internalType":"contract Token"},{"type":"uint256","name":"_tokenPerSecond","internalType":"uint256"},{"type":"uint256","name":"_startTime","internalType":"uint256"}]},{"type":"event","name":"Deposit","inputs":[{"type":"address","name":"user","internalType":"address","indexed":true},{"type":"uint256","name":"pid","internalType":"uint256","indexed":true},{"type":"uint256","name":"amount","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"event","name":"EmergencyWithdraw","inputs":[{"type":"address","name":"user","internalType":"address","indexed":true},{"type":"uint256","name":"pid","internalType":"uint256","indexed":true},{"type":"uint256","name":"amount","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"event","name":"OwnershipTransferred","inputs":[{"type":"address","name":"previousOwner","internalType":"address","indexed":true},{"type":"address","name":"newOwner","internalType":"address","indexed":true}],"anonymous":false},{"type":"event","name":"SetDevAddress","inputs":[{"type":"address","name":"user","internalType":"address","indexed":true},{"type":"address","name":"newAddress","internalType":"address","indexed":true}],"anonymous":false},{"type":"event","name":"SetFeeAddress","inputs":[{"type":"address","name":"user","internalType":"address","indexed":true},{"type":"address","name":"newAddress","internalType":"address","indexed":true}],"anonymous":false},{"type":"event","name":"UpdateEmissionRate","inputs":[{"type":"address","name":"user","internalType":"address","indexed":true},{"type":"uint256","name":"tokenPerSecond","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"event","name":"UpdateStartTime","inputs":[{"type":"uint256","name":"newStartBlock","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"event","name":"Withdraw","inputs":[{"type":"address","name":"user","internalType":"address","indexed":true},{"type":"uint256","name":"pid","internalType":"uint256","indexed":true},{"type":"uint256","name":"amount","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"event","name":"addPool","inputs":[{"type":"uint256","name":"pid","internalType":"uint256","indexed":true},{"type":"address","name":"lpToken","internalType":"address","indexed":false},{"type":"uint256","name":"allocPoint","internalType":"uint256","indexed":false},{"type":"uint256","name":"depositFeeBP","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"event","name":"setPool","inputs":[{"type":"uint256","name":"pid","internalType":"uint256","indexed":true},{"type":"address","name":"lpToken","internalType":"address","indexed":false},{"type":"uint256","name":"allocPoint","internalType":"uint256","indexed":false},{"type":"uint256","name":"depositFeeBP","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"event","name":"tokenMintError","inputs":[{"type":"bytes","name":"reason","internalType":"bytes","indexed":false}],"anonymous":false},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"MAX_EMISSION_RATE","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"add","inputs":[{"type":"uint256","name":"_allocPoint","internalType":"uint256"},{"type":"address","name":"_lpToken","internalType":"contract IBEP20"},{"type":"uint16","name":"_depositFeeBP","internalType":"uint16"},{"type":"bool","name":"_withUpdate","internalType":"bool"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"deposit","inputs":[{"type":"uint256","name":"_pid","internalType":"uint256"},{"type":"uint256","name":"_amount","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"address"}],"name":"devaddr","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"emergencyWithdraw","inputs":[{"type":"uint256","name":"_pid","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"address"}],"name":"feeaddr","inputs":[]},{"type":"function","stateMutability":"pure","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"getMultiplier","inputs":[{"type":"uint256","name":"_from","internalType":"uint256"},{"type":"uint256","name":"_to","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"massUpdatePools","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"address"}],"name":"owner","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"pendingToken","inputs":[{"type":"uint256","name":"_pid","internalType":"uint256"},{"type":"address","name":"_user","internalType":"address"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"bool","name":"","internalType":"bool"}],"name":"poolExistence","inputs":[{"type":"address","name":"","internalType":"contract IBEP20"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"lpToken","internalType":"contract IBEP20"},{"type":"uint256","name":"allocPoint","internalType":"uint256"},{"type":"uint256","name":"lastRewardTime","internalType":"uint256"},{"type":"uint256","name":"accTokenPerShare","internalType":"uint256"},{"type":"uint16","name":"depositFeeBP","internalType":"uint16"},{"type":"uint256","name":"lpSupply","internalType":"uint256"}],"name":"poolInfo","inputs":[{"type":"uint256","name":"","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"poolLength","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"renounceOwnership","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"set","inputs":[{"type":"uint256","name":"_pid","internalType":"uint256"},{"type":"uint256","name":"_allocPoint","internalType":"uint256"},{"type":"uint16","name":"_depositFeeBP","internalType":"uint16"},{"type":"bool","name":"_withUpdate","internalType":"bool"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"setDevAddress","inputs":[{"type":"address","name":"_devaddr","internalType":"address"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"setFeeAddress","inputs":[{"type":"address","name":"_feeAddress","internalType":"address"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"startTime","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"contract Token"}],"name":"token","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"tokenPerSecond","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"totalAllocPoint","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"transferOwnership","inputs":[{"type":"address","name":"newOwner","internalType":"address"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"updateEmissionRate","inputs":[{"type":"uint256","name":"_tokenPerSecond","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"updatePool","inputs":[{"type":"uint256","name":"_pid","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"updateStartTime","inputs":[{"type":"uint256","name":"_newStartTime","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"amount","internalType":"uint256"},{"type":"uint256","name":"rewardDebt","internalType":"uint256"}],"name":"userInfo","inputs":[{"type":"uint256","name":"","internalType":"uint256"},{"type":"address","name":"","internalType":"address"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"withdraw","inputs":[{"type":"uint256","name":"_pid","internalType":"uint256"},{"type":"uint256","name":"_amount","internalType":"uint256"}]}]
            

Deployed ByteCode

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