Cryo Explorer Ethereum Mainnet

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "IERC20.sol";
import "Address.sol";

/**
 * @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 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) + value;
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            uint256 newAllowance = oldAllowance - value;
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
        }
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) { // Return data is optional
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^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);
}

// SPDX-License-Identifier: MIT

pragma solidity ^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);
            }
        }
    }
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.9;

interface IStrategyZaps {
    function claimFromVaultAsUnderlying(
        uint256 amount,
        uint256 assetIndex,
        uint256 minAmountOut,
        address to
    ) external returns (uint256);

    function claimFromVaultAsFxs(
        uint256 amount,
        uint256 minAmountOut,
        address to
    ) external returns (uint256);

    function claimFromVaultAsEth(
        uint256 amount,
        uint256 minAmountOut,
        address to
    ) external returns (uint256);

    function claimFromVaultViaUniV2EthPair(
        uint256 amount,
        uint256 minAmountOut,
        address router,
        address outputToken,
        address to
    ) external;

    function claimFromVaultAsUsdt(
        uint256 amount,
        uint256 minAmountOut,
        address to
    ) external returns (uint256);

    function claimFromVaultAsCvx(
        uint256 amount,
        uint256 minAmountOut,
        address to,
        bool lock
    ) external returns (uint256);

    function claimFromVaultAsCvx(
        uint256 amount,
        uint256 minAmountOut,
        address to
    ) external returns (uint256);

    function claimFromVaultAsCrv(
        uint256 amount,
        uint256 minAmountOut,
        address to
    ) external returns (uint256);

    function claimFromVaultAsCvxCrv(
        uint256 amount,
        uint256 minAmountOut,
        address to
    ) external returns (uint256);

    function claimFromVaultAndStakeIn3PoolConvex(
        uint256 amount,
        uint256 minAmountOut,
        address to
    ) external returns (uint256);
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.9;

interface IGenericDistributor {
    function vault() external view returns (address);

    function merkleRoot() external view returns (bytes32);

    function week() external view returns (uint32);

    function frozen() external view returns (bool);

    function isClaimed(uint256 index) external view returns (bool);

    function setApprovals() external;

    function claim(
        uint256 index,
        address account,
        uint256 amount,
        bytes32[] calldata merkleProof
    ) external;

    function freeze() external;

    function unfreeze() external;

    function stake() external;

    function updateMerkleRoot(bytes32 newMerkleRoot, bool unfreeze) external;

    function updateDepositor(address newDepositor) external;

    function updateAdmin(address newAdmin) external;

    function updateVault(address newVault) external;

    event DepositorUpdated(
        address indexed oldDepositor,
        address indexed newDepositor
    );

    event AdminUpdated(address indexed oldAdmin, address indexed newAdmin);

    event VaultUpdated(address indexed oldVault, address indexed newVault);

    event MerkleRootUpdated(bytes32 indexed merkleRoot, uint32 indexed week);
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.9;

interface IGenericVault {
    function withdraw(address _to, uint256 _shares)
        external
        returns (uint256 withdrawn);

    function withdrawAll(address _to) external returns (uint256 withdrawn);

    function depositAll(address _to) external returns (uint256 _shares);

    function deposit(address _to, uint256 _amount)
        external
        returns (uint256 _shares);

    function harvest() external;

    function balanceOfUnderlying(address user)
        external
        view
        returns (uint256 amount);

    function totalUnderlying() external view returns (uint256 total);

    function totalSupply() external view returns (uint256 total);

    function underlying() external view returns (address);

    function strategy() external view returns (address);

    function platform() external view returns (address);

    function setPlatform(address _platform) external;

    function setPlatformFee(uint256 _fee) external;

    function setCallIncentive(uint256 _incentive) external;

    function setWithdrawalPenalty(uint256 _penalty) external;

    function setApprovals() external;

    function callIncentive() external view returns (uint256);

    function withdrawalPenalty() external view returns (uint256);

    function platformFee() external view returns (uint256);

    function balanceOf(address owner) external view returns (uint256);

    function allowance(address owner, address spender)
        external
        view
        returns (uint256);

    function approve(address spender, uint256 value) external returns (bool);

    function transfer(address to, uint256 value) external returns (bool);

    function transferFrom(
        address from,
        address to,
        uint256 value
    ) external returns (bool);
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.9;

import "SafeERC20.sol";
import "IStrategyZaps.sol";
import "IGenericDistributor.sol";
import "IGenericVault.sol";

contract stkCvxFxsDistributorZaps {
    using SafeERC20 for IERC20;

    address public immutable zaps;
    address public vault;
    IGenericDistributor public distributor;

    constructor(
        address _strategyZaps,
        address _distributor,
        address _vault
    ) {
        zaps = _strategyZaps;
        distributor = IGenericDistributor(_distributor);
        vault = _vault;
    }

    function setApprovals() external {
        IERC20(vault).safeApprove(zaps, 0);
        IERC20(vault).safeApprove(zaps, type(uint256).max);
    }

    /// @notice Claim from distributor and transfer back tokens to zap
    function _claim(
        uint256 index,
        address account,
        uint256 amount,
        bytes32[] calldata merkleProof
    ) internal {
        distributor.claim(index, account, amount, merkleProof);
        IERC20(vault).safeTransferFrom(msg.sender, address(this), amount);
    }

    /// @notice Claim from distributor as cvxFXS
    /// @param index - claimer index
    /// @param account - claimer account
    /// @param amount - claim amount
    /// @param merkleProof - merkle proof for the claim
    /// @param minAmountOut - minimum amount of underlying tokens expected
    /// @param to - address to send withdrawn underlying to
    /// @return amount of underlying withdrawn
    function claimFromDistributorAsUnderlying(
        uint256 index,
        address account,
        uint256 amount,
        bytes32[] calldata merkleProof,
        uint256 minAmountOut,
        address to
    ) external returns (uint256) {
        _claim(index, account, amount, merkleProof);
        return IGenericVault(vault).withdrawAll(to);
    }

    /// @notice Claim from distributor as FXS
    /// @param index - claimer index
    /// @param account - claimer account
    /// @param amount - claim amount
    /// @param merkleProof - merkle proof for the claim
    /// @param minAmountOut - minimum amount of underlying tokens expected
    /// @param to - address to send withdrawn underlying to
    /// @return amount of underlying withdrawn
    function claimFromDistributorAsFxs(
        uint256 index,
        address account,
        uint256 amount,
        bytes32[] calldata merkleProof,
        uint256 minAmountOut,
        address to
    ) external returns (uint256) {
        _claim(index, account, amount, merkleProof);
        return
            IStrategyZaps(zaps).claimFromVaultAsFxs(amount, minAmountOut, to);
    }

    /// @notice Claim from distributor as USDT.
    /// @param index - claimer index
    /// @param account - claimer account
    /// @param amount - claim amount
    /// @param merkleProof - merkle proof for the claim
    /// @param minAmountOut - the min expected amount of USDT to receive
    /// @param to - the adress that will receive the USDT
    /// @return amount of USDT obtained
    function claimFromDistributorAsUsdt(
        uint256 index,
        address account,
        uint256 amount,
        bytes32[] calldata merkleProof,
        uint256 minAmountOut,
        address to
    ) external returns (uint256) {
        _claim(index, account, amount, merkleProof);
        return
            IStrategyZaps(zaps).claimFromVaultAsUsdt(amount, minAmountOut, to);
    }

    /// @notice Claim to any token via a univ2 router
    /// @notice Use at your own risk
    /// @param amount - amount of uCRV to unstake
    /// @param minAmountOut - min amount of output token expected
    /// @param router - address of the router to use. e.g. 0xd9e1cE17f2641f24aE83637ab66a2cca9C378B9F for Sushi
    /// @param outputToken - address of the token to swap to
    /// @param to - address of the final recipient of the swapped tokens
    function claimFromDistributorViaUniV2EthPair(
        uint256 index,
        address account,
        uint256 amount,
        bytes32[] calldata merkleProof,
        uint256 minAmountOut,
        address router,
        address outputToken,
        address to
    ) external {
        _claim(index, account, amount, merkleProof);
        IStrategyZaps(zaps).claimFromVaultViaUniV2EthPair(
            amount,
            minAmountOut,
            router,
            outputToken,
            to
        );
    }

    /// @notice Claim from distributor as ETH.
    /// @param index - claimer index
    /// @param account - claimer account
    /// @param amount - claim amount
    /// @param merkleProof - merkle proof for the claim
    /// @param minAmountOut - min amount of ETH expected
    /// @param to - address to lock on behalf of
    function claimFromDistributorAsEth(
        uint256 index,
        address account,
        uint256 amount,
        bytes32[] calldata merkleProof,
        uint256 minAmountOut,
        address to
    ) external {
        _claim(index, account, amount, merkleProof);
        IStrategyZaps(zaps).claimFromVaultAsEth(amount, minAmountOut, to);
    }

    /// @notice Claim from distributor as CVX and optionally lock.
    /// @param index - claimer index
    /// @param account - claimer account
    /// @param amount - claim amount
    /// @param merkleProof - merkle proof for the claim
    /// @param minAmountOut - min amount of CVX expected
    /// @param to - address to lock on behalf of
    /// @param lock - whether to lock the Cvx or not
    function claimFromDistributorAsCvx(
        uint256 index,
        address account,
        uint256 amount,
        bytes32[] calldata merkleProof,
        uint256 minAmountOut,
        address to,
        bool lock
    ) external {
        _claim(index, account, amount, merkleProof);
        IStrategyZaps(zaps).claimFromVaultAsCvx(amount, minAmountOut, to, lock);
    }
}