> For the complete documentation index, see [llms.txt](https://docs.alkemi.network/earn-contracts/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.alkemi.network/earn-contracts/docs/interestratemodel.md).

# InterestRateModel Interface (InterestRateModel.sol)

View Source: [contracts/InterestRateModel.sol](https://app.gitbook.com/s/-MQ0mmOovvt0G2zyJIgA/contracts/InterestRateModel.sol)

Any interest rate model should derive from this contract.

### Functions

* getSupplyRate(address asset, uint256 cash, uint256 borrows)
* getBorrowRate(address asset, uint256 cash, uint256 borrows)

#### getSupplyRate

Gets the current supply interest rate based on the given asset, total cash and total borrows

```javascript
function getSupplyRate(address asset, uint256 cash, uint256 borrows) public view
returns(uint256, uint256)
```

**Returns**

Success or failure and the supply interest rate per block scaled by 10e18

**Arguments**

| Name    | Type    | Description                                  |
| ------- | ------- | -------------------------------------------- |
| asset   | address | The asset to get the interest rate of        |
| cash    | uint256 | The total cash of the asset in the market    |
| borrows | uint256 | The total borrows of the asset in the market |

#### getBorrowRate

Gets the current borrow interest rate based on the given asset, total cash and total borrows

```javascript
function getBorrowRate(address asset, uint256 cash, uint256 borrows) public view
returns(uint256, uint256)
```

**Returns**

Success or failure and the borrow interest rate per block scaled by 10e18

**Arguments**

| Name    | Type    | Description                                  |
| ------- | ------- | -------------------------------------------- |
| asset   | address | The asset to get the interest rate of        |
| cash    | uint256 | The total cash of the asset in the market    |
| borrows | uint256 | The total borrows of the asset in the market |