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/**
 *Submitted for verification at Etherscan.io on 2022-01-11
*/

// SPDX-License-Identifier: MIT

pragma solidity 0.8.9;



// Part: IBasicRewards

interface IBasicRewards {
    function stakeFor(address, uint256) external returns (bool);

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

    function earned(address) external view returns (uint256);

    function withdrawAll(bool) external returns (bool);

    function withdraw(uint256, bool) external returns (bool);

    function getReward() external returns (bool);

    function stake(uint256) external returns (bool);
}

// Part: ICurveFactoryPool

interface ICurveFactoryPool {
    function get_dy(
        int128 i,
        int128 j,
        uint256 dx
    ) external view returns (uint256);

    function get_balances() external view returns (uint256[2] memory);

    function add_liquidity(
        uint256[2] memory _amounts,
        uint256 _min_mint_amount,
        address _receiver
    ) external returns (uint256);

    function exchange(
        int128 i,
        int128 j,
        uint256 _dx,
        uint256 _min_dy,
        address _receiver
    ) external returns (uint256);
}

// Part: ICurvePool

interface ICurvePool {
    function remove_liquidity_one_coin(
        uint256 token_amount,
        int128 i,
        uint256 min_amount
    ) external;

    function calc_withdraw_one_coin(uint256 _token_amount, int128 i)
        external
        view
        returns (uint256);
}

// Part: ICurveTriCrypto

interface ICurveTriCrypto {
    function exchange(
        uint256 i,
        uint256 j,
        uint256 dx,
        uint256 min_dy,
        bool use_eth
    ) external;

    function get_dy(
        uint256 i,
        uint256 j,
        uint256 dx
    ) external view returns (uint256);
}

// Part: ICurveV2Pool

interface ICurveV2Pool {
    function get_dy(
        uint256 i,
        uint256 j,
        uint256 dx
    ) external view returns (uint256);

    function exchange_underlying(
        uint256 i,
        uint256 j,
        uint256 dx,
        uint256 min_dy
    ) external payable returns (uint256);
}

// Part: ICvxCrvDeposit

interface ICvxCrvDeposit {
    function deposit(uint256, bool) external;
}

// Part: ICvxMining

interface ICvxMining {
    function ConvertCrvToCvx(uint256 _amount) external view returns (uint256);
}

// Part: IVirtualBalanceRewardPool

interface IVirtualBalanceRewardPool {
    function earned(address account) external view returns (uint256);
}

// Part: OpenZeppelin/[email protected]/Address

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        // 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);
            }
        }
    }
}

// Part: OpenZeppelin/[email protected]/Context

/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

// Part: OpenZeppelin/[email protected]/IERC20

/**
 * @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);
}

// Part: OpenZeppelin/[email protected]/ReentrancyGuard

/**
 * @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 () {
        _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;
    }
}

// Part: OpenZeppelin/[email protected]/IERC20Metadata

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

// Part: OpenZeppelin/[email protected]/Ownable

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor () {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

// Part: OpenZeppelin/[email protected]/SafeERC20

/**
 * @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");
        }
    }
}

// Part: UnionBase

// Common variables and functions
contract UnionBase {
    address public constant CVXCRV_STAKING_CONTRACT =
        0x3Fe65692bfCD0e6CF84cB1E7d24108E434A7587e;
    address public constant CURVE_CRV_ETH_POOL =
        0x8301AE4fc9c624d1D396cbDAa1ed877821D7C511;
    address public constant CURVE_CVX_ETH_POOL =
        0xB576491F1E6e5E62f1d8F26062Ee822B40B0E0d4;
    address public constant CURVE_CVXCRV_CRV_POOL =
        0x9D0464996170c6B9e75eED71c68B99dDEDf279e8;

    address public constant CRV_TOKEN =
        0xD533a949740bb3306d119CC777fa900bA034cd52;
    address public constant CVXCRV_TOKEN =
        0x62B9c7356A2Dc64a1969e19C23e4f579F9810Aa7;
    address public constant CVX_TOKEN =
        0x4e3FBD56CD56c3e72c1403e103b45Db9da5B9D2B;

    uint256 public constant CRVETH_ETH_INDEX = 0;
    uint256 public constant CRVETH_CRV_INDEX = 1;
    int128 public constant CVXCRV_CRV_INDEX = 0;
    int128 public constant CVXCRV_CVXCRV_INDEX = 1;
    uint256 public constant CVXETH_ETH_INDEX = 0;
    uint256 public constant CVXETH_CVX_INDEX = 1;

    IBasicRewards cvxCrvStaking = IBasicRewards(CVXCRV_STAKING_CONTRACT);
    ICurveV2Pool cvxEthSwap = ICurveV2Pool(CURVE_CVX_ETH_POOL);
    ICurveV2Pool crvEthSwap = ICurveV2Pool(CURVE_CRV_ETH_POOL);
    ICurveFactoryPool crvCvxCrvSwap = ICurveFactoryPool(CURVE_CVXCRV_CRV_POOL);

    /// @notice Swap CRV for cvxCRV on Curve
    /// @param amount - amount to swap
    /// @param recipient - where swapped tokens will be sent to
    /// @return amount of CRV obtained after the swap
    function _swapCrvToCvxCrv(uint256 amount, address recipient)
        internal
        returns (uint256)
    {
        return _crvToCvxCrv(amount, recipient, 0);
    }

    /// @notice Swap CRV for cvxCRV on Curve
    /// @param amount - amount to swap
    /// @param recipient - where swapped tokens will be sent to
    /// @param minAmountOut - minimum expected amount of output tokens
    /// @return amount of CRV obtained after the swap
    function _swapCrvToCvxCrv(
        uint256 amount,
        address recipient,
        uint256 minAmountOut
    ) internal returns (uint256) {
        return _crvToCvxCrv(amount, recipient, minAmountOut);
    }

    /// @notice Swap CRV for cvxCRV on Curve
    /// @param amount - amount to swap
    /// @param recipient - where swapped tokens will be sent to
    /// @param minAmountOut - minimum expected amount of output tokens
    /// @return amount of CRV obtained after the swap
    function _crvToCvxCrv(
        uint256 amount,
        address recipient,
        uint256 minAmountOut
    ) internal returns (uint256) {
        return
            crvCvxCrvSwap.exchange(
                CVXCRV_CRV_INDEX,
                CVXCRV_CVXCRV_INDEX,
                amount,
                minAmountOut,
                recipient
            );
    }

    /// @notice Swap cvxCRV for CRV on Curve
    /// @param amount - amount to swap
    /// @param recipient - where swapped tokens will be sent to
    /// @return amount of CRV obtained after the swap
    function _swapCvxCrvToCrv(uint256 amount, address recipient)
        internal
        returns (uint256)
    {
        return _cvxCrvToCrv(amount, recipient, 0);
    }

    /// @notice Swap cvxCRV for CRV on Curve
    /// @param amount - amount to swap
    /// @param recipient - where swapped tokens will be sent to
    /// @param minAmountOut - minimum expected amount of output tokens
    /// @return amount of CRV obtained after the swap
    function _swapCvxCrvToCrv(
        uint256 amount,
        address recipient,
        uint256 minAmountOut
    ) internal returns (uint256) {
        return _cvxCrvToCrv(amount, recipient, minAmountOut);
    }

    /// @notice Swap cvxCRV for CRV on Curve
    /// @param amount - amount to swap
    /// @param recipient - where swapped tokens will be sent to
    /// @param minAmountOut - minimum expected amount of output tokens
    /// @return amount of CRV obtained after the swap
    function _cvxCrvToCrv(
        uint256 amount,
        address recipient,
        uint256 minAmountOut
    ) internal returns (uint256) {
        return
            crvCvxCrvSwap.exchange(
                CVXCRV_CVXCRV_INDEX,
                CVXCRV_CRV_INDEX,
                amount,
                minAmountOut,
                recipient
            );
    }

    /// @notice Swap CRV for native ETH on Curve
    /// @param amount - amount to swap
    /// @return amount of ETH obtained after the swap
    function _swapCrvToEth(uint256 amount) internal returns (uint256) {
        return _crvToEth(amount, 0);
    }

    /// @notice Swap CRV for native ETH on Curve
    /// @param amount - amount to swap
    /// @param minAmountOut - minimum expected amount of output tokens
    /// @return amount of ETH obtained after the swap
    function _swapCrvToEth(uint256 amount, uint256 minAmountOut)
        internal
        returns (uint256)
    {
        return _crvToEth(amount, minAmountOut);
    }

    /// @notice Swap CRV for native ETH on Curve
    /// @param amount - amount to swap
    /// @param minAmountOut - minimum expected amount of output tokens
    /// @return amount of ETH obtained after the swap
    function _crvToEth(uint256 amount, uint256 minAmountOut)
        internal
        returns (uint256)
    {
        return
            crvEthSwap.exchange_underlying{value: 0}(
                CRVETH_CRV_INDEX,
                CRVETH_ETH_INDEX,
                amount,
                minAmountOut
            );
    }

    /// @notice Swap native ETH for CRV on Curve
    /// @param amount - amount to swap
    /// @return amount of CRV obtained after the swap
    function _swapEthToCrv(uint256 amount) internal returns (uint256) {
        return _ethToCrv(amount, 0);
    }

    /// @notice Swap native ETH for CRV on Curve
    /// @param amount - amount to swap
    /// @param minAmountOut - minimum expected amount of output tokens
    /// @return amount of CRV obtained after the swap
    function _swapEthToCrv(uint256 amount, uint256 minAmountOut)
        internal
        returns (uint256)
    {
        return _ethToCrv(amount, minAmountOut);
    }

    /// @notice Swap native ETH for CRV on Curve
    /// @param amount - amount to swap
    /// @param minAmountOut - minimum expected amount of output tokens
    /// @return amount of CRV obtained after the swap
    function _ethToCrv(uint256 amount, uint256 minAmountOut)
        internal
        returns (uint256)
    {
        return
            crvEthSwap.exchange_underlying{value: amount}(
                CRVETH_ETH_INDEX,
                CRVETH_CRV_INDEX,
                amount,
                minAmountOut
            );
    }

    /// @notice Swap native ETH for CVX on Curve
    /// @param amount - amount to swap
    /// @return amount of CRV obtained after the swap
    function _swapEthToCvx(uint256 amount) internal returns (uint256) {
        return _ethToCvx(amount, 0);
    }

    /// @notice Swap native ETH for CVX on Curve
    /// @param amount - amount to swap
    /// @param minAmountOut - minimum expected amount of output tokens
    /// @return amount of CRV obtained after the swap
    function _swapEthToCvx(uint256 amount, uint256 minAmountOut)
        internal
        returns (uint256)
    {
        return _ethToCvx(amount, minAmountOut);
    }

    /// @notice Swap native ETH for CVX on Curve
    /// @param amount - amount to swap
    /// @param minAmountOut - minimum expected amount of output tokens
    /// @return amount of CRV obtained after the swap
    function _ethToCvx(uint256 amount, uint256 minAmountOut)
        internal
        returns (uint256)
    {
        return
            cvxEthSwap.exchange_underlying{value: amount}(
                CVXETH_ETH_INDEX,
                CVXETH_CVX_INDEX,
                amount,
                minAmountOut
            );
    }

    modifier notToZeroAddress(address _to) {
        require(_to != address(0), "Invalid address!");
        _;
    }
}

// Part: ClaimZaps

contract ClaimZaps is ReentrancyGuard, UnionBase {
    using SafeERC20 for IERC20;

    // Possible options when claiming
    enum Option {
        Claim,
        ClaimAsETH,
        ClaimAsCRV,
        ClaimAsCVX,
        ClaimAndStake
    }

    /// @notice Set approvals for the tokens used when swapping
    function _setApprovals() internal {
        IERC20(CRV_TOKEN).safeApprove(CURVE_CRV_ETH_POOL, 0);
        IERC20(CRV_TOKEN).safeApprove(CURVE_CRV_ETH_POOL, type(uint256).max);

        IERC20(CVXCRV_TOKEN).safeApprove(CVXCRV_STAKING_CONTRACT, 0);
        IERC20(CVXCRV_TOKEN).safeApprove(
            CVXCRV_STAKING_CONTRACT,
            type(uint256).max
        );

        IERC20(CVXCRV_TOKEN).safeApprove(CURVE_CVXCRV_CRV_POOL, 0);
        IERC20(CVXCRV_TOKEN).safeApprove(
            CURVE_CVXCRV_CRV_POOL,
            type(uint256).max
        );
    }

    function _claimAs(
        address account,
        uint256 amount,
        Option option
    ) internal {
        _claim(account, amount, option, 0);
    }

    function _claimAs(
        address account,
        uint256 amount,
        Option option,
        uint256 minAmountOut
    ) internal {
        _claim(account, amount, option, minAmountOut);
    }

    /// @notice Zap function to claim token balance as another token
    /// @param account - recipient of the swapped token
    /// @param amount - amount to swap
    /// @param option - what to swap to
    /// @param minAmountOut - minimum desired amount of output token
    function _claim(
        address account,
        uint256 amount,
        Option option,
        uint256 minAmountOut
    ) internal nonReentrant {
        if (option == Option.ClaimAsCRV) {
            _swapCvxCrvToCrv(amount, account, minAmountOut);
        } else if (option == Option.ClaimAsETH) {
            uint256 _crvBalance = _swapCvxCrvToCrv(amount, address(this));
            uint256 _ethAmount = _swapCrvToEth(_crvBalance, minAmountOut);
            (bool success, ) = account.call{value: _ethAmount}("");
            require(success, "ETH transfer failed");
        } else if (option == Option.ClaimAsCVX) {
            uint256 _crvBalance = _swapCvxCrvToCrv(amount, address(this));
            uint256 _ethAmount = _swapCrvToEth(_crvBalance);
            uint256 _cvxAmount = _swapEthToCvx(_ethAmount, minAmountOut);
            IERC20(CVX_TOKEN).safeTransfer(account, _cvxAmount);
        } else if (option == Option.ClaimAndStake) {
            require(cvxCrvStaking.stakeFor(account, amount), "Staking failed");
        } else {
            IERC20(CVXCRV_TOKEN).safeTransfer(account, amount);
        }
    }
}

// Part: OpenZeppelin/[email protected]/ERC20

/**
 * @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, IERC20Metadata {
    mapping (address => uint256) private _balances;

    mapping (address => mapping (address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * The defaut value of {decimals} is 18. To select a different value for
     * {decimals} you should overload it.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */
    constructor (string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual override 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 this function is
     * overridden;
     *
     * 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 override returns (uint8) {
        return 18;
    }

    /**
     * @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);

        uint256 currentAllowance = _allowances[sender][_msgSender()];
        require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance");
        _approve(sender, _msgSender(), currentAllowance - amount);

        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] + 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) {
        uint256 currentAllowance = _allowances[_msgSender()][spender];
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        _approve(_msgSender(), spender, currentAllowance - subtractedValue);

        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);

        uint256 senderBalance = _balances[sender];
        require(senderBalance >= amount, "ERC20: transfer amount exceeds balance");
        _balances[sender] = senderBalance - amount;
        _balances[recipient] += 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 += amount;
        _balances[account] += 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);

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        _balances[account] = accountBalance - amount;
        _totalSupply -= 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 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: UnionVault.sol

contract UnionVault is ClaimZaps, ERC20, Ownable {
    using SafeERC20 for IERC20;

    address private constant TRIPOOL =
        0xbEbc44782C7dB0a1A60Cb6fe97d0b483032FF1C7;
    address private constant THREECRV_TOKEN =
        0x6c3F90f043a72FA612cbac8115EE7e52BDe6E490;
    address private constant USDT_TOKEN =
        0xdAC17F958D2ee523a2206206994597C13D831ec7;
    address private constant TRICRYPTO =
        0xD51a44d3FaE010294C616388b506AcdA1bfAAE46;
    address private constant CVX_MINING_LIB =
        0x3c75BFe6FbfDa3A94E7E7E8c2216AFc684dE5343;
    address private constant THREE_CRV_REWARDS =
        0x7091dbb7fcbA54569eF1387Ac89Eb2a5C9F6d2EA;
    address private constant CVXCRV_DEPOSIT =
        0x8014595F2AB54cD7c604B00E9fb932176fDc86Ae;
    address public platform = 0x9Bc7c6ad7E7Cf3A6fCB58fb21e27752AC1e53f99;

    uint256 public withdrawalPenalty = 100;
    uint256 public constant MAX_WITHDRAWAL_PENALTY = 150;
    uint256 public platformFee = 500;
    uint256 public constant MAX_PLATFORM_FEE = 2000;
    uint256 public callIncentive = 500;
    uint256 public constant MAX_CALL_INCENTIVE = 500;
    uint256 public constant FEE_DENOMINATOR = 10000;

    ICurvePool private tripool = ICurvePool(TRIPOOL);
    ICurveTriCrypto private tricrypto = ICurveTriCrypto(TRICRYPTO);

    event Harvest(address indexed _caller, uint256 _value);
    event Deposit(address indexed _from, address indexed _to, uint256 _value);
    event Withdraw(address indexed _from, address indexed _to, uint256 _value);

    event WithdrawalPenaltyUpdated(uint256 _penalty);
    event CallerIncentiveUpdated(uint256 _incentive);
    event PlatformFeeUpdated(uint256 _fee);
    event PlatformUpdated(address indexed _platform);

    constructor()
        ERC20(
            string(abi.encodePacked("Unionized cvxCRV")),
            string(abi.encodePacked("uCRV"))
        )
    {}

    /// @notice Set approvals for the contracts used when swapping & staking
    function setApprovals() external onlyOwner {
        IERC20(THREECRV_TOKEN).safeApprove(TRIPOOL, 0);
        IERC20(THREECRV_TOKEN).safeApprove(TRIPOOL, type(uint256).max);

        IERC20(CVX_TOKEN).safeApprove(CURVE_CVX_ETH_POOL, 0);
        IERC20(CVX_TOKEN).safeApprove(CURVE_CVX_ETH_POOL, type(uint256).max);

        IERC20(USDT_TOKEN).safeApprove(TRICRYPTO, 0);
        IERC20(USDT_TOKEN).safeApprove(TRICRYPTO, type(uint256).max);

        IERC20(CRV_TOKEN).safeApprove(CVXCRV_DEPOSIT, 0);
        IERC20(CRV_TOKEN).safeApprove(CVXCRV_DEPOSIT, type(uint256).max);

        IERC20(CRV_TOKEN).safeApprove(CURVE_CVXCRV_CRV_POOL, 0);
        IERC20(CRV_TOKEN).safeApprove(CURVE_CVXCRV_CRV_POOL, type(uint256).max);

        _setApprovals();
    }

    /// @notice Updates the withdrawal penalty
    /// @param _penalty - the amount of the new penalty (in BIPS)
    function setWithdrawalPenalty(uint256 _penalty) external onlyOwner {
        require(_penalty <= MAX_WITHDRAWAL_PENALTY);
        withdrawalPenalty = _penalty;
        emit WithdrawalPenaltyUpdated(_penalty);
    }

    /// @notice Updates the caller incentive for harvests
    /// @param _incentive - the amount of the new incentive (in BIPS)
    function setCallIncentive(uint256 _incentive) external onlyOwner {
        require(_incentive <= MAX_CALL_INCENTIVE);
        callIncentive = _incentive;
        emit CallerIncentiveUpdated(_incentive);
    }

    /// @notice Updates the part of yield redirected to the platform
    /// @param _fee - the amount of the new platform fee (in BIPS)
    function setPlatformFee(uint256 _fee) external onlyOwner {
        require(_fee <= MAX_PLATFORM_FEE);
        platformFee = _fee;
        emit PlatformFeeUpdated(_fee);
    }

    /// @notice Updates the address to which platform fees are paid out
    /// @param _platform - the new platform wallet address
    function setPlatform(address _platform)
        external
        onlyOwner
        notToZeroAddress(_platform)
    {
        platform = _platform;
        emit PlatformUpdated(_platform);
    }

    /// @notice Query the amount currently staked
    /// @return total - the total amount of tokens staked
    function totalUnderlying() public view returns (uint256 total) {
        return cvxCrvStaking.balanceOf(address(this));
    }

    /// @notice Query the total amount of currently claimable CRV
    /// @return total - the total amount of CRV claimable
    function outstandingCrvRewards() public view returns (uint256 total) {
        return cvxCrvStaking.earned(address(this));
    }

    /// @notice Query the total amount of currently claimable CVX
    /// @return total - the total amount of CVX claimable
    function outstandingCvxRewards() external view returns (uint256 total) {
        return
            ICvxMining(CVX_MINING_LIB).ConvertCrvToCvx(outstandingCrvRewards());
    }

    /// @notice Query the total amount of currently claimable 3CRV
    /// @return total - the total amount of 3CRV claimable
    function outstanding3CrvRewards() external view returns (uint256 total) {
        return
            IVirtualBalanceRewardPool(THREE_CRV_REWARDS).earned(address(this));
    }

    /// @notice Returns the amount of cvxCRV a user can claim
    /// @param user - address whose claimable amount to query
    /// @return amount - claimable amount
    /// @dev Does not account for penalties and fees
    function balanceOfUnderlying(address user)
        external
        view
        returns (uint256 amount)
    {
        require(totalSupply() > 0, "No users");
        return ((balanceOf(user) * totalUnderlying()) / totalSupply());
    }

    /// @notice Returns the address of the underlying token
    function underlying() external view returns (address) {
        return CVXCRV_TOKEN;
    }

    /// @notice Claim rewards and swaps them to cvxCrv for restaking
    /// @dev Can be called by anyone against an incentive in cvxCrv
    function harvest() public {
        // claim rewards
        cvxCrvStaking.getReward();

        // sell CVX rewards for ETH
        uint256 _cvxAmount = IERC20(CVX_TOKEN).balanceOf(address(this));
        if (_cvxAmount > 0) {
            cvxEthSwap.exchange_underlying{value: 0}(
                CVXETH_CVX_INDEX,
                CVXETH_ETH_INDEX,
                _cvxAmount,
                0
            );
        }

        // pull 3crv out as USDT, swap for ETH
        uint256 _threeCrvBalance = IERC20(THREECRV_TOKEN).balanceOf(
            address(this)
        );
        if (_threeCrvBalance > 0) {
            tripool.remove_liquidity_one_coin(_threeCrvBalance, 2, 0);

            uint256 _usdtBalance = IERC20(USDT_TOKEN).balanceOf(address(this));
            if (_usdtBalance > 0) {
                tricrypto.exchange(0, 2, _usdtBalance, 0, true);
            }
        }
        // swap everything to CRV
        uint256 _crvBalance = IERC20(CRV_TOKEN).balanceOf(address(this));
        uint256 _ethBalance = address(this).balance;
        if (_ethBalance > 0) {
            _crvBalance += _swapEthToCrv(address(this).balance);
        }
        if (_crvBalance > 0) {
            uint256 _quote = crvCvxCrvSwap.get_dy(
                CVXCRV_CRV_INDEX,
                CVXCRV_CVXCRV_INDEX,
                _crvBalance
            );
            // swap on Curve if there is a premium for doing so
            if (_quote > _crvBalance) {
                _swapCrvToCvxCrv(_crvBalance, address(this));
            }
            // otherwise deposit & lock
            else {
                ICvxCrvDeposit(CVXCRV_DEPOSIT).deposit(_crvBalance, true);
            }
        }
        uint256 _cvxCrvBalance = IERC20(CVXCRV_TOKEN).balanceOf(address(this));

        emit Harvest(msg.sender, _cvxCrvBalance);

        // if this is the last call, no restake & no fees
        if (totalSupply() == 0) {
            return;
        }

        if (_cvxCrvBalance > 0) {
            uint256 _stakingAmount = _cvxCrvBalance;
            // Deduce and pay out incentive to caller (not needed for final exit)
            if (callIncentive > 0) {
                uint256 incentiveAmount = (_cvxCrvBalance * callIncentive) /
                    FEE_DENOMINATOR;
                IERC20(CVXCRV_TOKEN).safeTransfer(msg.sender, incentiveAmount);
                _stakingAmount = _stakingAmount - incentiveAmount;
            }
            // Deduce and pay platform fee
            if (platformFee > 0) {
                uint256 feeAmount = (_cvxCrvBalance * platformFee) /
                    FEE_DENOMINATOR;
                IERC20(CVXCRV_TOKEN).safeTransfer(platform, feeAmount);
                _stakingAmount = _stakingAmount - feeAmount;
            }
            cvxCrvStaking.stake(_stakingAmount);
        }
    }

    /// @notice Deposit user funds in the autocompounder and mints tokens
    /// representing user's share of the pool in exchange
    /// @param _to - the address that will receive the shares
    /// @param _amount - the amount of cvxCrv to deposit
    /// @return _shares - the amount of shares issued
    function deposit(address _to, uint256 _amount)
        public
        notToZeroAddress(_to)
        returns (uint256 _shares)
    {
        require(_amount > 0, "Deposit too small");

        uint256 _before = totalUnderlying();
        IERC20(CVXCRV_TOKEN).safeTransferFrom(
            msg.sender,
            address(this),
            _amount
        );
        cvxCrvStaking.stake(_amount);

        // Issues shares in proportion of deposit to pool amount
        uint256 shares = 0;
        if (totalSupply() == 0) {
            shares = _amount;
        } else {
            shares = (_amount * totalSupply()) / _before;
        }
        _mint(_to, shares);
        emit Deposit(msg.sender, _to, _amount);
        return shares;
    }

    /// @notice Deposit all of user's cvxCRV balance
    /// @param _to - the address that will receive the shares
    /// @return _shares - the amount of shares issued
    function depositAll(address _to) external returns (uint256 _shares) {
        return deposit(_to, IERC20(CVXCRV_TOKEN).balanceOf(msg.sender));
    }

    /// @notice Unstake cvxCrv in proportion to the amount of shares sent
    /// @param _shares - the number of shares sent
    /// @return _withdrawable - the withdrawable cvxCrv amount
    function _withdraw(uint256 _shares)
        internal
        returns (uint256 _withdrawable)
    {
        require(totalSupply() > 0);
        // Computes the amount withdrawable based on the number of shares sent
        uint256 amount = (_shares * totalUnderlying()) / totalSupply();
        // Burn the shares before retrieving tokens
        _burn(msg.sender, _shares);
        // If user is last to withdraw, harvest before exit
        if (totalSupply() == 0) {
            harvest();
            cvxCrvStaking.withdraw(totalUnderlying(), false);
            _withdrawable = IERC20(CVXCRV_TOKEN).balanceOf(address(this));
        }
        // Otherwise compute share and unstake
        else {
            _withdrawable = amount;
            // Substract a small withdrawal fee to prevent users "timing"
            // the harvests. The fee stays staked and is therefore
            // redistributed to all remaining participants.
            uint256 _penalty = (_withdrawable * withdrawalPenalty) /
                FEE_DENOMINATOR;
            _withdrawable = _withdrawable - _penalty;
            cvxCrvStaking.withdraw(_withdrawable, false);
        }
        return _withdrawable;
    }

    /// @notice Unstake cvxCrv in proportion to the amount of shares sent
    /// @param _to - address to send cvxCrv to
    /// @param _shares - the number of shares sent
    /// @return withdrawn - the amount of cvxCRV returned to the user
    function withdraw(address _to, uint256 _shares)
        public
        notToZeroAddress(_to)
        returns (uint256 withdrawn)
    {
        // Withdraw requested amount of cvxCrv
        uint256 _withdrawable = _withdraw(_shares);
        // And sends back cvxCrv to user
        IERC20(CVXCRV_TOKEN).safeTransfer(_to, _withdrawable);
        emit Withdraw(msg.sender, _to, _withdrawable);
        return _withdrawable;
    }

    /// @notice Withdraw all of a users' position as cvxCRV
    /// @param _to - address to send cvxCrv to
    /// @return withdrawn - the amount of cvxCRV returned to the user
    function withdrawAll(address _to)
        external
        notToZeroAddress(_to)
        returns (uint256 withdrawn)
    {
        return withdraw(_to, balanceOf(msg.sender));
    }

    /// @notice Zap function to withdraw as another token
    /// @param _to - address to send cvxCrv to
    /// @param _shares - the number of shares sent
    /// @param option - what to swap to
    function withdrawAs(
        address _to,
        uint256 _shares,
        Option option
    ) external notToZeroAddress(_to) {
        uint256 _withdrawn = _withdraw(_shares);
        _claimAs(_to, _withdrawn, option);
    }

    /// @notice Zap function to withdraw all shares to another token
    /// @param _to - address to send cvxCrv to
    /// @param option - what to swap to
    function withdrawAllAs(address _to, Option option)
        external
        notToZeroAddress(_to)
    {
        uint256 _withdrawn = _withdraw(balanceOf(msg.sender));
        _claimAs(_to, _withdrawn, option);
    }

    /// @notice Zap function to withdraw as another token
    /// @param _to - address to send cvxCrv to
    /// @param _shares - the number of shares sent
    /// @param option - what to swap to
    /// @param minAmountOut - minimum desired amount of output token
    function withdrawAs(
        address _to,
        uint256 _shares,
        Option option,
        uint256 minAmountOut
    ) external notToZeroAddress(_to) {
        uint256 _withdrawn = _withdraw(_shares);
        _claimAs(_to, _withdrawn, option, minAmountOut);
    }

    /// @notice Zap function to withdraw all shares to another token
    /// @param _to - address to send cvxCrv to
    /// @param option - what to swap to
    /// @param minAmountOut - minimum desired amount of output token
    function withdrawAllAs(
        address _to,
        Option option,
        uint256 minAmountOut
    ) external notToZeroAddress(_to) {
        uint256 _withdrawn = _withdraw(balanceOf(msg.sender));
        _claimAs(_to, _withdrawn, option, minAmountOut);
    }

    receive() external payable {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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ame":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"approve","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"user","type":"address"}],"name":"balanceOfUnderlying","outputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"callIncentive","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"subtractedValue","type":"uint256"}],"name":"decreaseAllowance","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_to","type":"address"},{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"deposit","outputs":[{"internalType":"uint256","name":"_shares","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_to","type":"address"}],"name":"depositAll","outputs":[{"internalType":"uint256","name":"_shares","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"harvest","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"addedValue","type":"uint256"}],"name":"increaseAllowance","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"outstanding3CrvRewards","outputs":[{"internalType":"uint256","name":"total","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"outstandingCrvRewards","outputs":[{"internalType":"uint256","name":"total","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"outstandingCvxRewards","outputs":[{"internalType":"uint256","name":"total","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"platform","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"platformFee","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"setApprovals","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_incentive","type":"uint256"}],"name":"setCallIncentive","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_platform","type":"address"}],"name":"setPlatform","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_fee","type":"uint256"}],"name":"setPlatformFee","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_penalty","type":"uint256"}],"name":"setWithdrawalPenalty","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalUnderlying","outputs":[{"internalType":"uint256","name":"total","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"sender","type":"address"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"underlying","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_to","type":"address"},{"internalType":"uint256","name":"_shares","type":"uint256"}],"name":"withdraw","outputs":[{"internalType":"uint256","name":"withdrawn","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_to","type":"address"}],"name":"withdrawAll","outputs":[{"internalType":"uint256","name":"withdrawn","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_to","type":"address"},{"internalType":"enum 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ClaimZaps.Option","name":"option","type":"uint8"},{"internalType":"uint256","name":"minAmountOut","type":"uint256"}],"name":"withdrawAs","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"withdrawalPenalty","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"stateMutability":"payable","type":"receive"}]

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