> For the complete documentation index, see [llms.txt](https://docs.algebra.finance/algebra-integral-documentation/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.algebra.finance/algebra-integral-documentation/algebra-v1-technical-reference/contracts/api-reference-v2.0-directional-fees/v2.0-directional-fees-periphery/iperipheryimmutablestate.md).

# IPeripheryImmutableState

Immutable state

Functions that return immutable state of the router

*Developer note: Credit to Uniswap Labs under GPL-2.0-or-later license: <https://github.com/Uniswap/v3-periphery>*

## Functions

### factory

`function factory() external view returns (address)` view external

**Returns:**

| Name | Type    | Description                                |
| ---- | ------- | ------------------------------------------ |
| \[0] | address | Returns the address of the Algebra factory |

### poolDeployer

`function poolDeployer() external view returns (address)` view external

**Returns:**

| Name | Type    | Description                              |
| ---- | ------- | ---------------------------------------- |
| \[0] | address | Returns the address of the pool Deployer |

### WNativeToken

`function WNativeToken() external view returns (address)` view external

**Returns:**

| Name | Type    | Description                         |
| ---- | ------- | ----------------------------------- |
| \[0] | address | Returns the address of WNativeToken |