> 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/interestratemodel.md).

# Interest Rate Model

*Compound*

> Compound's InterestRateModel Interface

## Methods

### getBorrowRate

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

Calculates the current borrow interest rate per block

#### Parameters

| Name     | Type    | Description                                            |
| -------- | ------- | ------------------------------------------------------ |
| cash     | uint256 | The total amount of cash the market has                |
| borrows  | uint256 | The total amount of borrows the market has outstanding |
| reserves | uint256 | The total amount of reserves the market has            |

#### Returns

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

### getSupplyRate

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

Calculates the current supply interest rate per block

#### Parameters

| Name                  | Type    | Description                                            |
| --------------------- | ------- | ------------------------------------------------------ |
| cash                  | uint256 | The total amount of cash the market has                |
| borrows               | uint256 | The total amount of borrows the market has outstanding |
| reserves              | uint256 | The total amount of reserves the market has            |
| reserveFactorMantissa | uint256 | The current reserve factor the market has              |

#### Returns

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

### isInterestRateModel

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

Indicator that this is an InterestRateModel contract (for inspection)

#### Returns

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