> For the complete documentation index, see [llms.txt](https://docs.fringe.fi/smart-contract-documentation/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.fringe.fi/smart-contract-documentation/interest-rate-model/jumpratemodelv2.md).

# Jump Rate Model V 2

*Arr00*

> Compound's JumpRateModel Contract V2 for V2 cTokens

Supports only for V2 cTokens

## Methods

### baseRatePerBlock

```solidity
function baseRatePerBlock() external view returns (uint256)
```

The base interest rate which is the y-intercept when utilization rate is 0

#### Returns

| Name | Type    | Description |
| ---- | ------- | ----------- |
| \_0  | uint256 | undefined   |

### blocksPerYear

```solidity
function blocksPerYear() external view returns (uint256)
```

The approximate number of blocks per year that is assumed by the interest rate model

#### Returns

| Name | Type    | Description |
| ---- | ------- | ----------- |
| \_0  | uint256 | undefined   |

### getBorrowRate

```solidity
function getBorrowRate(uint256 cash, uint256 borrows, uint256 reserves) external view returns (uint256)
```

Calculates the current borrow rate per block

#### Parameters

| Name     | Type    | Description                          |
| -------- | ------- | ------------------------------------ |
| cash     | uint256 | The amount of cash in the market     |
| borrows  | uint256 | The amount of borrows in the market  |
| reserves | uint256 | The amount of reserves in the market |

#### Returns

| Name | Type    | Description                                                         |
| ---- | ------- | ------------------------------------------------------------------- |
| \_0  | uint256 | The borrow rate percentage per block as a mantissa (scaled by 1e18) |

### getSupplyRate

```solidity
function getSupplyRate(uint256 cash, uint256 borrows, uint256 reserves, uint256 reserveFactorMantissa) external view returns (uint256)
```

#### Parameters

| Name                  | Type    | Description |
| --------------------- | ------- | ----------- |
| cash                  | uint256 | undefined   |
| borrows               | uint256 | undefined   |
| reserves              | uint256 | undefined   |
| reserveFactorMantissa | uint256 | undefined   |

#### Returns

| Name | Type    | Description |
| ---- | ------- | ----------- |
| \_0  | uint256 | undefined   |

### isInterestRateModel

```solidity
function isInterestRateModel() external view returns (bool)
```

Indicator that this is an InterestRateModel contract (for inspection)

#### Returns

| Name | Type | Description |
| ---- | ---- | ----------- |
| \_0  | bool | undefined   |

### jumpMultiplierPerBlock

```solidity
function jumpMultiplierPerBlock() external view returns (uint256)
```

The multiplierPerBlock after hitting a specified utilization point

#### Returns

| Name | Type    | Description |
| ---- | ------- | ----------- |
| \_0  | uint256 | undefined   |

### kink

```solidity
function kink() external view returns (uint256)
```

The utilization point at which the jump multiplier is applied

#### Returns

| Name | Type    | Description |
| ---- | ------- | ----------- |
| \_0  | uint256 | undefined   |

### multiplierPerBlock

```solidity
function multiplierPerBlock() external view returns (uint256)
```

The multiplier of utilization rate that gives the slope of the interest rate

#### Returns

| Name | Type    | Description |
| ---- | ------- | ----------- |
| \_0  | uint256 | undefined   |

### owner

```solidity
function owner() external view returns (address)
```

The address of the owner, i.e. the Timelock contract, which can update parameters directly

#### Returns

| Name | Type    | Description |
| ---- | ------- | ----------- |
| \_0  | address | undefined   |

### updateJumpRateModel

```solidity
function updateJumpRateModel(uint256 baseRatePerYear, uint256 multiplierPerYear, uint256 jumpMultiplierPerYear, uint256 kink_) external nonpayable
```

Update the parameters of the interest rate model (only callable by owner, i.e. Timelock)

#### Parameters

| Name                  | Type    | Description                                                            |
| --------------------- | ------- | ---------------------------------------------------------------------- |
| baseRatePerYear       | uint256 | The approximate target base APR, as a mantissa (scaled by 1e18)        |
| multiplierPerYear     | uint256 | The rate of increase in interest rate wrt utilization (scaled by 1e18) |
| jumpMultiplierPerYear | uint256 | The multiplierPerBlock after hitting a specified utilization point     |
| kink\_                | uint256 | The utilization point at which the jump multiplier is applied          |

### utilizationRate

```solidity
function utilizationRate(uint256 cash, uint256 borrows, uint256 reserves) external pure returns (uint256)
```

Calculates the utilization rate of the market: `borrows / (cash + borrows - reserves)`

#### Parameters

| Name     | Type    | Description                                             |
| -------- | ------- | ------------------------------------------------------- |
| cash     | uint256 | The amount of cash in the market                        |
| borrows  | uint256 | The amount of borrows in the market                     |
| reserves | uint256 | The amount of reserves in the market (currently unused) |

#### Returns

| Name | Type    | Description                                           |
| ---- | ------- | ----------------------------------------------------- |
| \_0  | uint256 | The utilization rate as a mantissa between \[0, 1e18] |

## Events

### NewInterestParams

```solidity
event NewInterestParams(uint256 baseRatePerBlock, uint256 multiplierPerBlock, uint256 jumpMultiplierPerBlock, uint256 kink)
```

#### Parameters

| Name                   | Type    | Description |
| ---------------------- | ------- | ----------- |
| baseRatePerBlock       | uint256 | undefined   |
| multiplierPerBlock     | uint256 | undefined   |
| jumpMultiplierPerBlock | uint256 | undefined   |
| kink                   | uint256 | undefined   |