*Submitted for verification at BscScan.com on 2021-10-16
*Submitted for verification at polygonscan.com on 2021-09-12
//SPDX-License-Identifier: None
* @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
* This contract is only required for intermediate, library-like contracts.
abstract contract Context {
function _msgSender() internal view virtual returns (address payable) {
function _msgData() internal view virtual returns (bytes memory) {
this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
* @dev Wrappers over Solidity's arithmetic operations with added overflow
* 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
* Using this library instead of the unchecked operations eliminates an entire
* class of bugs, so it's recommended to use it always.
* @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) {
if (c < a) return (false, 0);
* @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);
* @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);
if (c / a != b) return (false, 0);
* @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);
* @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);
* @dev Returns the addition of two unsigned integers, reverting on
* Counterpart to Solidity's `+` operator.
* - Addition cannot overflow.
function add(uint256 a, uint256 b) internal pure returns (uint256) {
require(c >= a, "SafeMath: addition overflow");
* @dev Returns the subtraction of two unsigned integers, reverting on
* overflow (when the result is negative).
* Counterpart to Solidity's `-` operator.
* - Subtraction cannot overflow.
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
require(b <= a, "SafeMath: subtraction overflow");
* @dev Returns the multiplication of two unsigned integers, reverting on
* Counterpart to Solidity's `*` operator.
* - Multiplication cannot overflow.
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
require(c / a == b, "SafeMath: multiplication overflow");
* @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).
* - The divisor cannot be zero.
function div(uint256 a, uint256 b) internal pure returns (uint256) {
require(b > 0, "SafeMath: division by zero");
* @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).
* - The divisor cannot be zero.
function mod(uint256 a, uint256 b) internal pure returns (uint256) {
require(b > 0, "SafeMath: modulo by zero");
* @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.
* - Subtraction cannot overflow.
function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b <= a, errorMessage);
* @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).
* - The divisor cannot be zero.
function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b > 0, errorMessage);
* @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).
* - The divisor cannot be zero.
function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b > 0, errorMessage);
* @dev Contract module which provides a basic access control mechanism, where
* there is an account (an owner) that can be granted exclusive access to
* 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
abstract contract Ownable is Context {
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
* @dev Initializes the contract setting the deployer as the initial owner.
constructor () internal {
address msgSender = _msgSender();
emit OwnershipTransferred(address(0), msgSender);
* @dev Returns the address of the current owner.
function owner() public view virtual returns (address) {
* @dev Throws if called by any account other than the owner.
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));
* @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);
* @dev Collection of functions related to the address type
* @dev Returns true if `account` is a contract.
* 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
* - 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.
// solhint-disable-next-line no-inline-assembly
assembly { size := extcodesize(account) }
* @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
* 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`].
* - `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`.
* - 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) {
// 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
let returndata_size := mload(returndata)
revert(add(32, returndata), returndata_size)
* @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
* 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
* Returns a boolean value indicating whether the operation succeeded.
* Emits a {Transfer} event.
) external returns (bool);
* @dev Emitted when `value` tokens are moved from one account (`from`) 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);
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;
* @dev Sets the values for {name} and {symbol}, initializes {decimals} with
* To select a different value for {decimals}, use {_setupDecimals}.
* All three of these values are immutable: they can only be set once during
constructor(string memory name, string memory symbol) public {
* @dev Returns the bep token owner.
function getOwner() external override view returns (address) {
* @dev Returns the token name.
function name() public override view returns (string memory) {
* @dev Returns the token decimals.
function decimals() public override view returns (uint8) {
* @dev Returns the token symbol.
function symbol() public override view returns (string memory) {
* @dev See {BEP20-totalSupply}.
function totalSupply() public override view returns (uint256) {
* @dev See {BEP20-balanceOf}.
function balanceOf(address account) public override view returns (uint256) {
return _balances[account];
* @dev See {BEP20-transfer}.
* - `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);
* @dev See {BEP20-allowance}.
function allowance(address owner, address spender) public override view returns (uint256) {
return _allowances[owner][spender];
* @dev See {BEP20-approve}.
* - `spender` cannot be the zero address.
function approve(address spender, uint256 amount) public override returns (bool) {
_approve(_msgSender(), spender, amount);
* @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};
* - `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
) public override returns (bool) {
_transfer(sender, recipient, amount);
_allowances[sender][_msgSender()].sub(amount, "BEP20: transfer amount exceeds allowance")
* @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.
* - `spender` cannot be the zero address.
function increaseAllowance(address spender, uint256 addedValue) public returns (bool) {
_approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
* @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.
* - `spender` cannot be the zero address.
* - `spender` must have allowance for the caller of at least
function decreaseAllowance(address spender, uint256 subtractedValue) public returns (bool) {
_allowances[_msgSender()][spender].sub(subtractedValue, "BEP20: decreased allowance below zero")
* @dev Creates `amount` tokens and assigns them to `msg.sender`, increasing
* - `msg.sender` must be the token owner
function mint(uint256 amount) public onlyOwner returns (bool) {
_mint(_msgSender(), amount);
* @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.
* - `sender` cannot be the zero address.
* - `recipient` cannot be the zero address.
* - `sender` must have a balance of at least `amount`.
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
* Emits a {Transfer} event with `from` set to the zero address.
* - `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
* Emits a {Transfer} event with `to` set to the zero address.
* - `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.
* - `owner` cannot be the zero address.
* - `spender` cannot be the zero address.
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 {
_allowances[account][_msgSender()].sub(amount, "BEP20: burn amount exceeds allowance")
contract ColosoToken is BEP20('Coloso', 'COLOSO') {
/// @notice Creates `_amount` token to `_to`. Must only be called by the owner (MasterChef).
function mint(address _to, uint256 _amount) public onlyOwner {