# IDragonswapV2PoolImmutables

These parameters are fixed for a pool forever, i.e., the methods will always return the same values

### Functions[​](https://docs.uniswap.org/contracts/v3/reference/core/interfaces/pool/IUniswapV3PoolImmutables#functions) <a href="#functions" id="functions"></a>

#### factory[​](https://docs.uniswap.org/contracts/v3/reference/core/interfaces/pool/IUniswapV3PoolImmutables#factory) <a href="#factory" id="factory"></a>

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

The contract that deployed the pool, which must adhere to the IDragonswapV2Factory interface

**Return Values:**[**​**](https://docs.uniswap.org/contracts/v3/reference/core/interfaces/pool/IUniswapV3PoolImmutables#return-values)

| Type    | Description      |
| ------- | ---------------- |
| address | contract address |

#### token0[​](https://docs.uniswap.org/contracts/v3/reference/core/interfaces/pool/IUniswapV3PoolImmutables#token0) <a href="#token0" id="token0"></a>

```solidity
  function token0(
  ) external view returns (address)
```

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

**Return Values:**[**​**](https://docs.uniswap.org/contracts/v3/reference/core/interfaces/pool/IUniswapV3PoolImmutables#return-values-1)

| Type    | Description            |
| ------- | ---------------------- |
| address | token contract address |

#### token1[​](https://docs.uniswap.org/contracts/v3/reference/core/interfaces/pool/IUniswapV3PoolImmutables#token1) <a href="#token1" id="token1"></a>

```solidity
  function token1(
  ) external view returns (address)
```

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

**Return Values:**[**​**](https://docs.uniswap.org/contracts/v3/reference/core/interfaces/pool/IUniswapV3PoolImmutables#return-values-2)

| Type    | Description            |
| ------- | ---------------------- |
| address | token contract address |

#### fee[​](https://docs.uniswap.org/contracts/v3/reference/core/interfaces/pool/IUniswapV3PoolImmutables#fee) <a href="#fee" id="fee"></a>

```solidity
  function fee(
  ) external view returns (uint24)
```

The pool's fee in hundredths of a bip, i.e. 1e-6

**Return Values:**[**​**](https://docs.uniswap.org/contracts/v3/reference/core/interfaces/pool/IUniswapV3PoolImmutables#return-values-3)

| Type   | Description |
| ------ | ----------- |
| uint24 | fee         |

#### tickSpacing[​](https://docs.uniswap.org/contracts/v3/reference/core/interfaces/pool/IUniswapV3PoolImmutables#tickspacing) <a href="#tickspacing" id="tickspacing"></a>

```solidity
  function tickSpacing(
  ) external view returns (int24)
```

The pool tick spacing

Ticks can only be used at multiples of this value, minimum of 1 and always positive e.g.: a tickSpacing of 3 means ticks can be initialized every 3rd tick, i.e., ..., -6, -3, 0, 3, 6, ... This value is an int24 to avoid casting even though it is always positive.

**Return Values:**[**​**](https://docs.uniswap.org/contracts/v3/reference/core/interfaces/pool/IUniswapV3PoolImmutables#return-values-4)

| Type  | Description  |
| ----- | ------------ |
| int24 | tick spacing |

#### maxLiquidityPerTick[​](https://docs.uniswap.org/contracts/v3/reference/core/interfaces/pool/IUniswapV3PoolImmutables#maxliquiditypertick) <a href="#maxliquiditypertick" id="maxliquiditypertick"></a>

```solidity
  function maxLiquidityPerTick(
  ) external view returns (uint128)
```

The maximum amount of position liquidity that can use any tick in the range

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

**Return Values:**[**​**](https://docs.uniswap.org/contracts/v3/reference/core/interfaces/pool/IUniswapV3PoolImmutables#return-values-5)

| Type    | Description                      |
| ------- | -------------------------------- |
| uint128 | max amount of liquidity per tick |