> For the complete documentation index, see [llms.txt](https://docs.rigoblock.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.rigoblock.com/solidity-api-reference/protocol/interfaces/v4/pool/ismartpoolimmutable.md).

# ISmartPoolImmutable

## ISmartPoolImmutable

### VERSION

```solidity
function VERSION() external view returns (string)
```

Returns a string of the pool version.

#### Return Values

| Name | Type   | Description                                |
| ---- | ------ | ------------------------------------------ |
| \[0] | string | String of the pool implementation version. |

### authority

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

Returns the address of the authority contract.

#### Return Values

| Name | Type    | Description                        |
| ---- | ------- | ---------------------------------- |
| \[0] | address | Address of the authority contract. |

### wrappedNative

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

Returns the address of the WETH9 contract.

*Used to convert WETH balances to ETH without executing an oracle call.*

#### Return Values

| Name | Type    | Description                    |
| ---- | ------- | ------------------------------ |
| \[0] | address | Address of the WETH9 contract. |

### tokenJar

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

Returns the address of the Rigoblock token jar contract.

*Used to transfer protocol fees to the buy-back-and-burn contract.*

#### Return Values

| Name | Type    | Description                        |
| ---- | ------- | ---------------------------------- |
| \[0] | address | Address of the token jar contract. |