> For the complete documentation index, see [llms.txt](https://docs-v4.venus.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs-v4.venus.io/technical-reference/reference-governance/irm-risk-steward.md).

# IRMRiskSteward

## IRMRiskSteward

Contract that can update interest rate models updates received from RiskStewardReceiver.

## Solidity API

#### INTEREST\_RATE\_MODEL

The update type for interest rate model

```solidity
string INTEREST_RATE_MODEL
```

***

#### INTEREST\_RATE\_MODEL\_KEY

The update type key for interest rate model (keccak256 hash of INTEREST\_RATE\_MODEL)

```solidity
bytes32 INTEREST_RATE_MODEL_KEY
```

***

#### CORE\_POOL\_COMPTROLLER

Address of the BNB Core Pool Comptroller.

```solidity
contract ICorePoolComptroller CORE_POOL_COMPTROLLER
```

***

#### RISK\_STEWARD\_RECEIVER

Address of the RiskStewardReceiver used to validate incoming updates

```solidity
contract IRiskStewardReceiver RISK_STEWARD_RECEIVER
```

***

#### constructor

Sets the immutable CORE\_POOL\_COMPTROLLER and RISK\_STEWARD\_RECEIVER addresses and disables initializers

```solidity
constructor(address corePoolComptroller_, address riskStewardReceiver_) public
```

**Parameters**

| Name                  | Type    | Description                              |
| --------------------- | ------- | ---------------------------------------- |
| corePoolComptroller\_ | address | The address of the Core Pool Comptroller |
| riskStewardReceiver\_ | address | The address of the RiskStewardReceiver   |

**❌ Errors**

* Throws ZeroAddressNotAllowed if any of the addresses are zero

***

#### initialize

Initializes the contract as ownable and access controlled.

```solidity
function initialize(address accessControlManager_) external
```

**Parameters**

| Name                   | Type    | Description                               |
| ---------------------- | ------- | ----------------------------------------- |
| accessControlManager\_ | address | The address of the access control manager |

***

#### applyUpdate

Applies an interest rate model update from the RiskStewardReceiver. Directly updates the market interest rate model on the vToken.

```solidity
function applyUpdate(struct RiskParameterUpdate update) external
```

**Parameters**

| Name   | Type                       | Description                         |
| ------ | -------------------------- | ----------------------------------- |
| update | struct RiskParameterUpdate | RiskParameterUpdate update to apply |

**📅 Events**

* Emits InterestRateModelUpdated with the updateId, market and new IRM address

**⛔️ Access Requirements**

* Only callable by the RiskStewardReceiver

**❌ Errors**

* Throws OnlyRiskStewardReceiver if the sender is not the RiskStewardReceiver
* Throws UnsupportedUpdateType if the update type is not supported

***

#### isSafeForDirectExecution

Checks if an update is safe for direct execution (no timelock required)

```solidity
function isSafeForDirectExecution(struct RiskParameterUpdate update) external view returns (bool)
```

**Parameters**

| Name   | Type                       | Description         |
| ------ | -------------------------- | ------------------- |
| update | struct RiskParameterUpdate | The update to check |

**Return Values**

| Name | Type | Description                                                                |
| ---- | ---- | -------------------------------------------------------------------------- |
| \[0] | bool | True if update is safe for direct execution, false if timelock is required |

**❌ Errors**

* Throws UnsupportedUpdateType if the update type is not supported
* Throws RedundantValue if the new IRM address is equal to the current IRM address

***


---

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