ERC-20
Frax Finance
Overview
Max Total Supply
219,826.369801121890623786 stkcvxXAIFRAXBP3CRV-f-frax
Holders
3 (0.00%)
Market
Onchain Market Cap
$0.00
Circulating Supply Market Cap
-
Other Info
Token Contract (WITH 18 Decimals)
Balance
0 stkcvxXAIFRAXBP3CRV-f-fraxValue
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# | Exchange | Pair | Price | 24H Volume | % Volume |
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Minimal Proxy Contract for 0xb410d27baa290c5d54ece34913eafb687aa2cb08
Contract Name:
ConvexStakingWrapperFrax
Compiler Version
v0.6.12+commit.27d51765
Contract Source Code (Solidity)
/** *Submitted for verification at Etherscan.io on 2022-11-01 */ // File: contracts\interfaces\IRewardStaking.sol // SPDX-License-Identifier: MIT pragma solidity 0.6.12; interface IRewardStaking { function stakeFor(address, uint256) external; function stake( uint256) external; function withdraw(uint256 amount, bool claim) external; function withdrawAndUnwrap(uint256 amount, bool claim) external; function earned(address account) external view returns (uint256); function getReward() external; function getReward(address _account, bool _claimExtras) external; function extraRewardsLength() external view returns (uint256); function extraRewards(uint256 _pid) external view returns (address); function rewardToken() external view returns (address); function balanceOf(address _account) external view returns (uint256); } // File: contracts\interfaces\IConvexDeposits.sol pragma solidity 0.6.12; interface IConvexDeposits { function deposit(uint256 _pid, uint256 _amount, bool _stake) external returns(bool); function deposit(uint256 _amount, bool _lock, address _stakeAddress) external; } // File: contracts\interfaces\ICvx.sol pragma solidity 0.6.12; interface ICvx { function reductionPerCliff() external view returns(uint256); function totalSupply() external view returns(uint256); function totalCliffs() external view returns(uint256); function maxSupply() external view returns(uint256); } // File: contracts\interfaces\CvxMining.sol pragma solidity 0.6.12; library CvxMining{ ICvx public constant cvx = ICvx(0x4e3FBD56CD56c3e72c1403e103b45Db9da5B9D2B); function ConvertCrvToCvx(uint256 _amount) external view returns(uint256){ uint256 supply = cvx.totalSupply(); uint256 reductionPerCliff = cvx.reductionPerCliff(); uint256 totalCliffs = cvx.totalCliffs(); uint256 maxSupply = cvx.maxSupply(); uint256 cliff = supply / reductionPerCliff; //mint if below total cliffs if(cliff < totalCliffs){ //for reduction% take inverse of current cliff uint256 reduction = totalCliffs - cliff; //reduce _amount = _amount * reduction / totalCliffs; //supply cap check uint256 amtTillMax = maxSupply - supply; if(_amount > amtTillMax){ _amount = amtTillMax; } //mint return _amount; } return 0; } } // File: contracts\interfaces\IBooster.sol pragma solidity 0.6.12; interface IBooster { function owner() external view returns(address); function setVoteDelegate(address _voteDelegate) external; function vote(uint256 _voteId, address _votingAddress, bool _support) external returns(bool); function voteGaugeWeight(address[] calldata _gauge, uint256[] calldata _weight ) external returns(bool); function poolInfo(uint256 _pid) external returns(address _lptoken, address _token, address _gauge, address _crvRewards, address _stash, bool _shutdown); } // File: @openzeppelin\contracts\math\SafeMath.sol pragma solidity >=0.6.0 <0.8.0; /** * @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; } } // File: @openzeppelin\contracts\token\ERC20\IERC20.sol pragma solidity >=0.6.0 <0.8.0; /** * @dev Interface of the ERC20 standard as defined in the EIP. */ interface IERC20 { /** * @dev Returns the amount of tokens in existence. */ function totalSupply() external view returns (uint256); /** * @dev Returns the amount of tokens owned by `account`. */ function balanceOf(address account) external view returns (uint256); /** * @dev Moves `amount` tokens from the caller's account to `recipient`. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transfer(address recipient, uint256 amount) external returns (bool); /** * @dev Returns the remaining number of tokens that `spender` will be * allowed to spend on behalf of `owner` through {transferFrom}. This is * zero by default. * * This value changes when {approve} or {transferFrom} are called. */ function allowance(address owner, address spender) external view returns (uint256); /** * @dev Sets `amount` as the allowance of `spender` over the caller's tokens. * * Returns a boolean value indicating whether the operation succeeded. * * IMPORTANT: Beware that changing an allowance with this method brings the risk * that someone may use both the old and the new allowance by unfortunate * transaction ordering. One possible solution to mitigate this race * condition is to first reduce the spender's allowance to 0 and set the * desired value afterwards: * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729 * * Emits an {Approval} event. */ function approve(address spender, uint256 amount) external returns (bool); /** * @dev Moves `amount` tokens from `sender` to `recipient` using the * allowance mechanism. `amount` is then deducted from the caller's * allowance. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transferFrom(address sender, address recipient, uint256 amount) external returns (bool); /** * @dev Emitted when `value` tokens are moved from one account (`from`) to * another (`to`). * * Note that `value` may be zero. */ event Transfer(address indexed from, address indexed to, uint256 value); /** * @dev Emitted when the allowance of a `spender` for an `owner` is set by * a call to {approve}. `value` is the new allowance. */ event Approval(address indexed owner, address indexed spender, uint256 value); } // File: @openzeppelin\contracts\utils\Address.sol pragma solidity >=0.6.2 <0.8.0; /** * @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); } } } } // File: @openzeppelin\contracts\token\ERC20\SafeERC20.sol pragma solidity >=0.6.0 <0.8.0; /** * @title SafeERC20 * @dev Wrappers around ERC20 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 SafeERC20 for IERC20;` statement to your contract, * which allows you to call the safe operations as `token.safeTransfer(...)`, etc. */ library SafeERC20 { using SafeMath for uint256; using Address for address; function safeTransfer(IERC20 token, address to, uint256 value) internal { _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value)); } function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal { _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value)); } /** * @dev Deprecated. This function has issues similar to the ones found in * {IERC20-approve}, and its usage is discouraged. * * Whenever possible, use {safeIncreaseAllowance} and * {safeDecreaseAllowance} instead. */ function safeApprove(IERC20 token, address spender, uint256 value) internal { // safeApprove should only be called when setting an initial allowance, // or when resetting it to zero. To increase and decrease it, use // 'safeIncreaseAllowance' and 'safeDecreaseAllowance' // solhint-disable-next-line max-line-length require((value == 0) || (token.allowance(address(this), spender) == 0), "SafeERC20: approve from non-zero to non-zero allowance" ); _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value)); } function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal { uint256 newAllowance = token.allowance(address(this), spender).add(value); _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance)); } function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal { uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: 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(IERC20 token, bytes memory data) private { // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that // the target address contains contract code and also asserts for success in the low-level call. bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed"); if (returndata.length > 0) { // Return data is optional // solhint-disable-next-line max-line-length require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed"); } } } // File: @openzeppelin\contracts\utils\Context.sol pragma solidity >=0.6.0 <0.8.0; /* * @dev Provides information about the current execution context, including the * sender of the transaction and its data. While these are generally available * via msg.sender and msg.data, they should not be accessed in such a direct * manner, since when dealing with 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; } } // File: @openzeppelin\contracts\token\ERC20\ERC20.sol pragma solidity >=0.6.0 <0.8.0; /** * @dev Implementation of the {IERC20} interface. * * This implementation is agnostic to the way tokens are created. This means * that a supply mechanism has to be added in a derived contract using {_mint}. * For a generic mechanism see {ERC20PresetMinterPauser}. * * TIP: For a detailed writeup see our guide * https://forum.zeppelin.solutions/t/how-to-implement-erc20-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 ERC20 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 {IERC20-approve}. */ contract ERC20 is Context, IERC20 { using SafeMath for uint256; 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 name of the token. */ function name() public view virtual returns (string memory) { return _name; } /** * @dev Returns the symbol of the token, usually a shorter version of the * name. */ function symbol() public view virtual returns (string memory) { return _symbol; } /** * @dev Returns the number of decimals used to get its user representation. * For example, if `decimals` equals `2`, a balance of `505` tokens should * be displayed to a user as `5,05` (`505 / 10 ** 2`). * * Tokens usually opt for a value of 18, imitating the relationship between * Ether and Wei. This is the value {ERC20} uses, unless {_setupDecimals} is * called. * * NOTE: This information is only used for _display_ purposes: it in * no way affects any of the arithmetic of the contract, including * {IERC20-balanceOf} and {IERC20-transfer}. */ function decimals() public view virtual returns (uint8) { return _decimals; } /** * @dev See {IERC20-totalSupply}. */ function totalSupply() public view virtual override returns (uint256) { return _totalSupply; } /** * @dev See {IERC20-balanceOf}. */ function balanceOf(address account) public view virtual override returns (uint256) { return _balances[account]; } /** * @dev See {IERC20-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 virtual override returns (bool) { _transfer(_msgSender(), recipient, amount); return true; } /** * @dev See {IERC20-allowance}. */ function allowance(address owner, address spender) public view virtual override returns (uint256) { return _allowances[owner][spender]; } /** * @dev See {IERC20-approve}. * * Requirements: * * - `spender` cannot be the zero address. */ function approve(address spender, uint256 amount) public virtual override returns (bool) { _approve(_msgSender(), spender, amount); return true; } /** * @dev See {IERC20-transferFrom}. * * Emits an {Approval} event indicating the updated allowance. This is not * required by the EIP. See the note at the beginning of {ERC20}. * * 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 virtual override returns (bool) { _transfer(sender, recipient, amount); _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: 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 {IERC20-approve}. * * Emits an {Approval} event indicating the updated allowance. * * Requirements: * * - `spender` cannot be the zero address. */ function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) { _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 {IERC20-approve}. * * Emits an {Approval} event indicating the updated allowance. * * Requirements: * * - `spender` cannot be the zero address. * - `spender` must have allowance for the caller of at least * `subtractedValue`. */ function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) { _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero")); 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), "ERC20: transfer from the zero address"); require(recipient != address(0), "ERC20: transfer to the zero address"); _beforeTokenTransfer(sender, recipient, amount); _balances[sender] = _balances[sender].sub(amount, "ERC20: 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 virtual { require(account != address(0), "ERC20: mint to the zero address"); _beforeTokenTransfer(address(0), account, amount); _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 virtual { require(account != address(0), "ERC20: burn from the zero address"); _beforeTokenTransfer(account, address(0), amount); _balances[account] = _balances[account].sub(amount, "ERC20: 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 internal function is equivalent to `approve`, and can be used to * e.g. set automatic allowances for certain subsystems, etc. * * Emits an {Approval} event. * * Requirements: * * - `owner` cannot be the zero address. * - `spender` cannot be the zero address. */ function _approve(address owner, address spender, uint256 amount) internal virtual { require(owner != address(0), "ERC20: approve from the zero address"); require(spender != address(0), "ERC20: approve to the zero address"); _allowances[owner][spender] = amount; emit Approval(owner, spender, amount); } /** * @dev Sets {decimals} to a value other than the default one of 18. * * WARNING: This function should only be called from the constructor. Most * applications that interact with token contracts will not expect * {decimals} to ever change, and may work incorrectly if it does. */ function _setupDecimals(uint8 decimals_) internal virtual { _decimals = decimals_; } /** * @dev Hook that is called before any transfer of tokens. This includes * minting and burning. * * Calling conditions: * * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens * will be to transferred to `to`. * - when `from` is zero, `amount` tokens will be minted for `to`. * - when `to` is zero, `amount` of ``from``'s tokens will be burned. * - `from` and `to` are never both zero. * * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. */ function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { } } // File: @openzeppelin\contracts\utils\ReentrancyGuard.sol pragma solidity >=0.6.0 <0.8.0; /** * @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 percentage 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; } } // File: contracts\wrappers\ConvexStakingWrapper.sol pragma solidity 0.6.12; pragma experimental ABIEncoderV2; //Example of a tokenize a convex staked position. //if used as collateral some modifications will be needed to fit the specific platform //Based on Curve.fi's gauge wrapper implementations at https://github.com/curvefi/curve-dao-contracts/tree/master/contracts/gauges/wrappers contract ConvexStakingWrapper is ERC20, ReentrancyGuard { using SafeERC20 for IERC20; using SafeMath for uint256; struct EarnedData { address token; uint256 amount; } struct RewardType { address reward_token; address reward_pool; uint128 reward_integral; uint128 reward_remaining; mapping(address => uint256) reward_integral_for; mapping(address => uint256) claimable_reward; } //constants/immutables address public constant convexBooster = address(0xF403C135812408BFbE8713b5A23a04b3D48AAE31); address public constant crv = address(0xD533a949740bb3306d119CC777fa900bA034cd52); address public constant cvx = address(0x4e3FBD56CD56c3e72c1403e103b45Db9da5B9D2B); address public curveToken; address public convexToken; address public convexPool; uint256 public convexPoolId; address public collateralVault; uint256 private constant CRV_INDEX = 0; uint256 private constant CVX_INDEX = 1; //rewards RewardType[] public rewards; mapping(address => uint256) public registeredRewards; //management bool public isShutdown; bool public isInit; address public owner; string internal _tokenname; string internal _tokensymbol; event Deposited(address indexed _user, address indexed _account, uint256 _amount, bool _wrapped); event Withdrawn(address indexed _user, uint256 _amount, bool _unwrapped); event OwnershipTransferred(address indexed previousOwner, address indexed newOwner); constructor() public ERC20( "StakedConvexToken", "stkCvx" ){ } function initialize(uint256 _poolId) virtual external { require(!isInit,"already init"); owner = msg.sender; emit OwnershipTransferred(address(0), owner); (address _lptoken, address _token, , address _rewards, , ) = IBooster(convexBooster).poolInfo(_poolId); curveToken = _lptoken; convexToken = _token; convexPool = _rewards; convexPoolId = _poolId; _tokenname = string(abi.encodePacked("Staked ", ERC20(_token).name() )); _tokensymbol = string(abi.encodePacked("stk", ERC20(_token).symbol())); isShutdown = false; isInit = true; // collateralVault = _vault; //add rewards addRewards(); setApprovals(); } function name() public view override returns (string memory) { return _tokenname; } function symbol() public view override returns (string memory) { return _tokensymbol; } function decimals() public view override returns (uint8) { return 18; } modifier onlyOwner() { require(owner == msg.sender, "Ownable: caller is not the 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; } function renounceOwnership() public virtual onlyOwner { emit OwnershipTransferred(owner, address(0)); owner = address(0); } function shutdown() external onlyOwner { isShutdown = true; } function setApprovals() public { IERC20(curveToken).safeApprove(convexBooster, 0); IERC20(curveToken).safeApprove(convexBooster, uint256(-1)); IERC20(convexToken).safeApprove(convexPool, 0); IERC20(convexToken).safeApprove(convexPool, uint256(-1)); } function addRewards() public { address mainPool = convexPool; if (rewards.length == 0) { rewards.push( RewardType({ reward_token: crv, reward_pool: mainPool, reward_integral: 0, reward_remaining: 0 }) ); rewards.push( RewardType({ reward_token: cvx, reward_pool: address(0), reward_integral: 0, reward_remaining: 0 }) ); registeredRewards[crv] = CRV_INDEX+1; //mark registered at index+1 registeredRewards[cvx] = CVX_INDEX+1; //mark registered at index+1 //send to self to warmup state IERC20(crv).transfer(address(this),0); //send to self to warmup state IERC20(cvx).transfer(address(this),0); } uint256 extraCount = IRewardStaking(mainPool).extraRewardsLength(); for (uint256 i = 0; i < extraCount; i++) { address extraPool = IRewardStaking(mainPool).extraRewards(i); address extraToken = IRewardStaking(extraPool).rewardToken(); if(extraToken == cvx){ //update cvx reward pool address rewards[CVX_INDEX].reward_pool = extraPool; }else if(registeredRewards[extraToken] == 0){ //add new token to list rewards.push( RewardType({ reward_token: IRewardStaking(extraPool).rewardToken(), reward_pool: extraPool, reward_integral: 0, reward_remaining: 0 }) ); registeredRewards[extraToken] = rewards.length; //mark registered at index+1 } } } function rewardLength() external view returns(uint256) { return rewards.length; } function _getDepositedBalance(address _account) internal virtual view returns(uint256) { if (_account == address(0) || _account == collateralVault) { return 0; } //get balance from collateralVault return balanceOf(_account); } function _getTotalSupply() internal virtual view returns(uint256){ //override and add any supply needed (interest based growth) return totalSupply(); } function _calcRewardIntegral(uint256 _index, address[2] memory _accounts, uint256[2] memory _balances, uint256 _supply, bool _isClaim) internal{ RewardType storage reward = rewards[_index]; //get difference in balance and remaining rewards //getReward is unguarded so we use reward_remaining to keep track of how much was actually claimed uint256 bal = IERC20(reward.reward_token).balanceOf(address(this)); // uint256 d_reward = bal.sub(reward.reward_remaining); if (_supply > 0 && bal.sub(reward.reward_remaining) > 0) { reward.reward_integral = reward.reward_integral + uint128(bal.sub(reward.reward_remaining).mul(1e20).div(_supply)); } //update user integrals for (uint256 u = 0; u < _accounts.length; u++) { //do not give rewards to address 0 if (_accounts[u] == address(0)) continue; if (_accounts[u] == collateralVault) continue; if(_isClaim && u != 0) continue; //only update/claim for first address and use second as forwarding uint userI = reward.reward_integral_for[_accounts[u]]; if(_isClaim || userI < reward.reward_integral){ if(_isClaim){ uint256 receiveable = reward.claimable_reward[_accounts[u]].add(_balances[u].mul( uint256(reward.reward_integral).sub(userI)).div(1e20)); if(receiveable > 0){ reward.claimable_reward[_accounts[u]] = 0; //cheat for gas savings by transfering to the second index in accounts list //if claiming only the 0 index will update so 1 index can hold forwarding info //guaranteed to have an address in u+1 so no need to check IERC20(reward.reward_token).safeTransfer(_accounts[u+1], receiveable); bal = bal.sub(receiveable); } }else{ reward.claimable_reward[_accounts[u]] = reward.claimable_reward[_accounts[u]].add(_balances[u].mul( uint256(reward.reward_integral).sub(userI)).div(1e20)); } reward.reward_integral_for[_accounts[u]] = reward.reward_integral; } } //update remaining reward here since balance could have changed if claiming if(bal != reward.reward_remaining){ reward.reward_remaining = uint128(bal); } } function _checkpoint(address[2] memory _accounts) internal nonReentrant{ //if shutdown, no longer checkpoint in case there are problems if(isShutdown) return; uint256 supply = _getTotalSupply(); uint256[2] memory depositedBalance; depositedBalance[0] = _getDepositedBalance(_accounts[0]); depositedBalance[1] = _getDepositedBalance(_accounts[1]); IRewardStaking(convexPool).getReward(address(this), true); _claimExtras(); uint256 rewardCount = rewards.length; for (uint256 i = 0; i < rewardCount; i++) { _calcRewardIntegral(i,_accounts,depositedBalance,supply,false); } } function _checkpointAndClaim(address[2] memory _accounts) internal nonReentrant{ uint256 supply = _getTotalSupply(); uint256[2] memory depositedBalance; depositedBalance[0] = _getDepositedBalance(_accounts[0]); //only do first slot IRewardStaking(convexPool).getReward(address(this), true); _claimExtras(); uint256 rewardCount = rewards.length; for (uint256 i = 0; i < rewardCount; i++) { _calcRewardIntegral(i,_accounts,depositedBalance,supply,true); } } //claim any rewards not part of the convex pool function _claimExtras() internal virtual{ //override and add external reward claiming } function user_checkpoint(address _account) external returns(bool) { _checkpoint([_account, address(0)]); return true; } function totalBalanceOf(address _account) external view returns(uint256){ return _getDepositedBalance(_account); } //run earned as a mutable function to claim everything before calculating earned rewards function earned(address _account) external returns(EarnedData[] memory claimable) { IRewardStaking(convexPool).getReward(address(this), true); _claimExtras(); return _earned(_account); } //run earned as a non-mutative function that may not claim everything, but should report standard convex rewards function earnedView(address _account) external view returns(EarnedData[] memory claimable) { return _earned(_account); } function _earned(address _account) internal view returns(EarnedData[] memory claimable) { uint256 supply = _getTotalSupply(); // uint256 depositedBalance = _getDepositedBalance(_account); uint256 rewardCount = rewards.length; claimable = new EarnedData[](rewardCount); for (uint256 i = 0; i < rewardCount; i++) { RewardType storage reward = rewards[i]; //change in reward is current balance - remaining reward + earned uint256 bal = IERC20(reward.reward_token).balanceOf(address(this)); uint256 d_reward = bal.sub(reward.reward_remaining); //some rewards (like minted cvx) may not have a reward pool directly on the convex pool so check if it exists if(reward.reward_pool != address(0)){ //add earned from the convex reward pool for the given token d_reward = d_reward.add(IRewardStaking(reward.reward_pool).earned(address(this))); } uint256 I = reward.reward_integral; if (supply > 0) { I = I + d_reward.mul(1e20).div(supply); } uint256 newlyClaimable = _getDepositedBalance(_account).mul(I.sub(reward.reward_integral_for[_account])).div(1e20); claimable[i].amount = claimable[i].amount.add(reward.claimable_reward[_account].add(newlyClaimable)); claimable[i].token = reward.reward_token; //calc cvx minted from crv and add to cvx claimables //note: crv is always index 0 so will always run before cvx if(i == CRV_INDEX){ //because someone can call claim for the pool outside of checkpoints, need to recalculate crv without the local balance I = reward.reward_integral; if (supply > 0) { I = I + IRewardStaking(reward.reward_pool).earned(address(this)).mul(1e20).div(supply); } newlyClaimable = _getDepositedBalance(_account).mul(I.sub(reward.reward_integral_for[_account])).div(1e20); claimable[CVX_INDEX].amount = CvxMining.ConvertCrvToCvx(newlyClaimable); claimable[CVX_INDEX].token = cvx; } } return claimable; } function getReward(address _account) external { //claim directly in checkpoint logic to save a bit of gas _checkpointAndClaim([_account, _account]); } function getReward(address _account, address _forwardTo) external { require(msg.sender == _account, "!self"); //claim directly in checkpoint logic to save a bit of gas //pack forwardTo into account array to save gas so that a proxy etc doesnt have to double transfer _checkpointAndClaim([_account,_forwardTo]); } //deposit a curve token function deposit(uint256 _amount, address _to) external { require(!isShutdown, "shutdown"); //dont need to call checkpoint since _mint() will if (_amount > 0) { _mint(_to, _amount); IERC20(curveToken).safeTransferFrom(msg.sender, address(this), _amount); IConvexDeposits(convexBooster).deposit(convexPoolId, _amount, true); } emit Deposited(msg.sender, _to, _amount, true); } //stake a convex token function stake(uint256 _amount, address _to) external { require(!isShutdown, "shutdown"); //dont need to call checkpoint since _mint() will if (_amount > 0) { _mint(_to, _amount); IERC20(convexToken).safeTransferFrom(msg.sender, address(this), _amount); IRewardStaking(convexPool).stake(_amount); } emit Deposited(msg.sender, _to, _amount, false); } //withdraw to convex deposit token function withdraw(uint256 _amount) external { //dont need to call checkpoint since _burn() will if (_amount > 0) { _burn(msg.sender, _amount); IRewardStaking(convexPool).withdraw(_amount, false); IERC20(convexToken).safeTransfer(msg.sender, _amount); } emit Withdrawn(msg.sender, _amount, false); } //withdraw to underlying curve lp token function withdrawAndUnwrap(uint256 _amount) external { //dont need to call checkpoint since _burn() will if (_amount > 0) { _burn(msg.sender, _amount); IRewardStaking(convexPool).withdrawAndUnwrap(_amount, false); IERC20(curveToken).safeTransfer(msg.sender, _amount); } //events emit Withdrawn(msg.sender, _amount, true); } function _beforeTokenTransfer(address _from, address _to, uint256 _amount) internal override { _checkpoint([_from, _to]); } } // File: contracts\wrappers\ConvexStakingWrapperFrax.sol pragma solidity 0.6.12; interface IFraxFarm { function lockedLiquidityOf(address account) external view returns (uint256 amount); } //Staking wrapper for Frax Finance platform //use convex LP positions as collateral while still receiving rewards contract ConvexStakingWrapperFrax is ConvexStakingWrapper { using SafeERC20 for IERC20; using SafeMath for uint256; constructor() public{} function initialize(uint256 _poolId) override external { require(!isInit,"already init"); owner = msg.sender; emit OwnershipTransferred(address(0), owner); (address _lptoken, address _token, , address _rewards, , ) = IBooster(convexBooster).poolInfo(_poolId); curveToken = _lptoken; convexToken = _token; convexPool = _rewards; convexPoolId = _poolId; _tokenname = string(abi.encodePacked("Staked ", ERC20(_token).name(), " Frax" )); _tokensymbol = string(abi.encodePacked("stk", ERC20(_token).symbol(), "-frax")); isShutdown = false; isInit = true; //set vault later // collateralVault = _vault; //add rewards addRewards(); setApprovals(); } function setVault(address _vault) external onlyOwner{ require(collateralVault == address(0), "already set"); collateralVault = _vault; } function _getDepositedBalance(address _account) internal override view returns(uint256) { if (_account == address(0) || _account == collateralVault) { return 0; } uint256 collateral; if(collateralVault != address(0)){ collateral = IFraxFarm(collateralVault).lockedLiquidityOf(_account); } return balanceOf(_account).add(collateral); } }
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A token is a representation of an on-chain or off-chain asset. The token page shows information such as price, total supply, holders, transfers and social links. Learn more about this page in our Knowledge Base.