> 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/collateral-factors-risk-steward.md).

# CollateralFactorsRiskSteward

## CollateralFactorsRiskSteward

Contract that can update collateral factors and liquidation thresholds received from `RiskStewardReceiver`.

## Solidity API

#### COLLATERAL\_FACTORS

The update type for collateral factor and liquidation threshold.

```solidity
string COLLATERAL_FACTORS
```

***

#### COLLATERAL\_FACTORS\_KEY

The update type key for collateral factors (keccak256 hash of COLLATERAL\_FACTORS)

```solidity
bytes32 COLLATERAL_FACTORS_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 and dispatch 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 |

***

#### setSafeDeltaBps

Sets the safe delta bps.

```solidity
function setSafeDeltaBps(uint256 safeDeltaBps_) external
```

**Parameters**

| Name           | Type    | Description            |
| -------------- | ------- | ---------------------- |
| safeDeltaBps\_ | uint256 | The new safe delta bps |

**📅 Events**

* Emits SafeDeltaBpsUpdated with the old and new safe delta bps

**⛔️ Access Requirements**

* Controlled by AccessControlManager

**❌ Errors**

* Throws InvalidSafeDeltaBps if the safe delta bps is greater than MAX\_BPS
* Throws RedundantValue if the new safe delta bps is equal to the current value

***

#### 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 collateral factor and liquidation threshold are unchanged

***

#### applyUpdate

Applies a collateral parameter update from the `RiskStewardReceiver`. Delta validation and timelock checks are already performed by `RiskStewardReceiver` before execution.

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

**Parameters**

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

**📅 Events**

* Emits CollateralFactorsUpdated with updateId

**⛔️ 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

***


---

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