> 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-v1.9-directional-fees/v1.9-directional-fees-core/poolimmutables.md).

# PoolImmutables

## Variables

### address dataStorageOperator immutable

The contract that stores all the timepoints and can perform actions with them

### address factory immutable

The contract that deployed the pool, which must adhere to the IAlgebraFactory interface

### address token0 immutable

The first of the two tokens of the pool, sorted by address

### address token1 immutable

The second of the two tokens of the pool, sorted by address

## Functions

### maxLiquidityPerTick

`function maxLiquidityPerTick() external pure returns (uint128)` pure external

The maximum amount of position liquidity that can use any tick in the range *Developer note: This parameter is enforced per tick to prevent liquidity from overflowing a uint128 at any point, and also prevents out-of-range liquidity from being used to prevent adding in-range liquidity to a pool*

**Returns:**

| Name | Type    | Description                          |
| ---- | ------- | ------------------------------------ |
| \[0] | uint128 | The max amount of liquidity per tick |