# InterestRateModel

*The interest rate model used by UTokens*

### BORROW\_RATE\_MAX\_MANTISSA

```solidity
uint256 BORROW_RATE_MAX_MANTISSA
```

*Maximum borrow rate that can ever be applied (0.005% / block)*

### interestRatePerBlock

```solidity
uint256 interestRatePerBlock
```

*IInterest rate per block*

### ReserveFactorExceeded

```solidity
error ReserveFactorExceeded()
```

### BorrowRateExceeded

```solidity
error BorrowRateExceeded()
```

### LogNewInterestParams

```solidity
event LogNewInterestParams(uint256 interestRate)
```

@dev Update interest parameters event @param interestRate New interest rate, 1e18 = 100%

### constructor

```solidity
constructor(uint256 interestRatePerBlock_) public
```

### getBorrowRate

```solidity
function getBorrowRate() public view returns (uint256)
```

*Get borrow rate per block*

### getSupplyRate

```solidity
function getSupplyRate(uint256 reserveFactorMantissa) public view returns (uint256)
```

*Get supply rate for given reserve factor If reserve factor is 100% interest acrues to the reserves If reserves factor is 0 interest acrues to uDAI minters*

#### Parameters

| Name                  | Type    | Description                 |
| --------------------- | ------- | --------------------------- |
| reserveFactorMantissa | uint256 | The reserve factor (scaled) |

### setInterestRate

```solidity
function setInterestRate(uint256 _interestRatePerBlock) external
```

*Set new interest rate per block Interest rate per block must be less than the max rate 0.005% / block*

#### Parameters

| Name                   | Type    | Description   |
| ---------------------- | ------- | ------------- |
| \_interestRatePerBlock | uint256 | Interest rate |