# BoostedSavingsVault V2 {% tabs %} {% tab title="Ethereum Mainnet" %} | Contract | Address | | -------------------------------------------------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------- | | [imUSD Vault](https://github.com/mstable/mStable-contracts/blob/master/contracts/rewards/boosted-staking/BoostedVault.sol) | [0x78befca7de27d07dc6e71da295cc2946681a6c7b](https://etherscan.io/address/0x78befca7de27d07dc6e71da295cc2946681a6c7b) | | [imBTC Vault](https://github.com/mstable/mStable-contracts/blob/master/contracts/rewards/boosted-staking/BoostedVault.sol) | [0xf38522f63f40f9dd81abafd2b8efc2ec958a3016](https://etherscan.io/address/0xf38522f63f40f9dd81abafd2b8efc2ec958a3016) | | {% endtab %} | | | {% endtabs %} | | ## Functions ### stake() `function stake (uint256 _amount) external` Stakes a given amount of the StakingToken for the sender | Parameter | Type | Description | | --------- | ------- | --------------------- | | `_amount` | uint256 | Units of StakingToken | ### stake() `function stake (address _beneficiary, uint256 _amount) external` Stakes a given amount of the StakingToken for a given beneficiary | Parameter | Type | Description | | -------------- | ------- | ------------------------------------------ | | `_beneficiary` | address | Staked tokens are credited to this address | | `_amount` | uint256 | Units of StakingToken | ### exit() `function exit () external` Withdraws stake from pool and claims any unlocked rewards.Note, this function is costly - the args for \_claimRewardsshould be determined off chain and then passed to other fn ### exit() `function exit (uint256 _first, uint256 _last) external` Withdraws stake from pool and claims any unlocked rewards. | Parameter | Type | Description | | --------- | ------- | ----------------------------------------- | | `_first` | uint256 | Index of the first array element to claim | | `_last` | uint256 | Index of the last array element to claim | ### withdraw() `function withdraw (uint256 _amount) external` Withdraws given stake amount from the pool | Parameter | Type | Description | | --------- | ------- | ------------------------------------- | | `_amount` | uint256 | Units of the staked token to withdraw | ### withdrawAndUnwrap() 1. Redeems the underlying mAsset tokens for bAsset tokens. 2. Swaps the underlying mAsset tokens for fAsset tokens in a Feeder Pool. Redeems staked interest-bearing asset tokens for either bAsset or fAsset tokens. Withdraws a given staked amount of interest-bearing assets from the vault, redeems the interest-bearing asset for the underlying mAsset and either `function withdrawAndUnwrap (uint256 _amount, uint256 _minAmountOut, address _output, address _beneficiary, address _router, bool _isBassetOut) external returns (uint256 outputQuantity)` | Parameter | Type | Description | | | --------------- | ------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ---------- | | `_amount` | uint256 | Units of the staked interest-bearing asset tokens to withdraw. eg imUSD or imBTC. | | | `_minAmountOut` | uint256 | Minimum units of `output` tokens to be received by the beneficiary. This is to the same decimal places as the `output` token. | | | `_output` | address |

Asset to receive in exchange for the redeemed mAssets. This can be a bAsset or a fAsset. For example:

| | `_beneficiary` | address | Address to send `output` tokens to. | | | `_router` | address | mAsset address if the `output` is a bAsset. Feeder Pool address if the `output` is a fAsset. | | | `_isBassetOut` | bool | `true` if `output` is a bAsset. `false` if `output` is a fAsset | | ### claimReward() `function claimReward () external` Claims only the tokens that have been immediately unlocked, not includingthose that are in the lockers. ### claimRewards() `function claimRewards () external` Claims all unlocked rewards for sender.Note, this function is costly - the args for \_claimRewardsshould be determined off chain and then passed to other fn ### claimRewards() `function claimRewards (uint256 _first, uint256 _last) external` Claims all unlocked rewards for sender. Both immediately unlockedrewards and also locked rewards past their time lock. | Parameter | Type | Description | | --------- | ------- | ----------------------------------------- | | `_first` | uint256 | Index of the first array element to claim | | `_last` | uint256 | Index of the last array element to claim | ### pokeBoost() `function pokeBoost () external` Pokes a given account to reset the boost ### getRewardToken() `function getRewardToken () external returns (contract IERC20)` Gets the RewardsToken ### lastTimeRewardApplicable() `function lastTimeRewardApplicable () public returns (uint256)` Gets the last applicable timestamp for this reward period ### rewardPerToken() `function rewardPerToken () public returns (uint256)` Calculates the amount of unclaimed rewards per token since last update,and sums with stored to give the new cumulative reward per token ### earned() `function earned (address _account) public returns (uint256)` Returned the units of IMMEDIATELY claimable rewards a user has to receive. Note - thisdoes NOT include the majority of rewards which will be locked up. | Parameter | Type | Description | | ---------- | ------- | ------------ | | `_account` | address | User address | ### unclaimedRewards() `function unclaimedRewards (address _account) external returns (uint256 amount, uint256 first, uint256 last)` Calculates all unclaimed reward data, finding both immediately unlocked rewardsand those that have passed their time lock. | Parameter | Type | Description | | ---------- | ------- | ------------ | | `_account` | address | User address | ### notifyRewardAmount() `function notifyRewardAmount (uint256 _reward) external` Notifies the contract that new rewards have been added.Calculates an updated rewardRate based on the rewards in period. | Parameter | Type | Description | | --------- | ------- | ----------------------------------------------------- | | `_reward` | uint256 | Units of RewardToken that have been added to the pool | --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://developers.mstable.org/contracts/vaults/boostedsavingsvault-1.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.