> ## Documentation Index
> Fetch the complete documentation index at: https://docs.mellow.finance/llms.txt
> Use this file to discover all available pages before exploring further.

# DepositWrapper

### Overview

`DepositWrapper` contract is a utility that wraps deposits of various tokens into a specific vault asset. It allows for deposits in ETH, WETH, stETH and wstETH.

### Key Features

* **Token Conversion**: Converts between ETH, WETH, stETH, and wstETH for deposits.
* **Direct Deposit**: Supports direct deposits into the vault with security checks.
* **Allowance Management**: Adjusts ERC20 allowances securely before deposit.

### Core Methods

1. **Deposit Function**
   * `deposit(address, address, uint256, uint256, uint256)`: Facilitates deposits into the vault after converting tokens.
     * **to**: The address receiving LP tokens after the deposit.
     * **token**: The address of the input token (WETH, stETH, wstETH, or native ETH).
     * **amount**: The amount of the input token.
     * **minLpAmount**: Minimum acceptable amount of LP tokens to be minted.
     * **deadline**: Time before which the deposit must be completed.
     * **Returns**: The amount of LP tokens minted.
     * **Errors**:
       * `InvalidTokenList`: If the vault does not exclusively accept wstETH.
       * `InvalidAmount`: If the input amount is zero or doesn't match `msg.value` for ETH.
       * `InvalidToken`: If the input token is not recognized.
     * **Event**:
       * `DepositWrapperDeposit(address, address, uint256, uint256, uint256)`: Emitted after a successful deposit.
         * **sender**: Address of the sender.
         * **token**: Address of the input token.
         * **amount**: Amount deposited.
         * **lpAmount**: Amount of LP tokens minted.
         * **deadline**: Deadline of the deposit operation.
2. **Conversion Helpers**
   * `_wethToWsteth(uint256)`: Converts WETH to wstETH through stETH.
   * `_ethToSteth(uint256)`: Converts native ETH to stETH.
   * `_stethToWsteth(uint256)`: Converts stETH to wstETH.
3. **Fallback Method**
   * `receive()`: Allows receiving ETH only from the WETH contract.
     * **Error**:
       * `InvalidSender`: Raised if ETH is received from an address other than WETH.