# WarpX V3 Factory

#### Creating a New Pool <a href="#user-content-creating-a-new-pool" id="user-content-creating-a-new-pool"></a>

```
function createPool(address tokenA, address tokenB, uint24 fee) external returns (address pool)
```

Creates a liquidity pool for the given token pair and fee tier.

* Tokens can be passed in any order; they will be sorted internally
* Reverts if the pool already exists or if the fee tier is not supported
* Returns the address of the newly created pool

**Parameters:**

| Name     | Type    | Description                                              |
| -------- | ------- | -------------------------------------------------------- |
| `tokenA` | address | One of the two tokens in the pool                        |
| `tokenB` | address | The other token in the pool                              |
| `fee`    | uint24  | Fee tier (e.g., 500, 3000, 10000) in hundredths of a bip |

**Example:**

```
address pool = factory.createPool(USDC, WETH, 3000); // 0.30% fee tier
```

#### Querying Existing Pools <a href="#user-content-querying-existing-pools" id="user-content-querying-existing-pools"></a>

```
function getPool(address tokenA, address tokenB, uint24 fee) external view returns (address pool)
```

Returns the pool address for a token pair and fee tier, or `address(0)` if it doesn't exist.

**Parameters:**

| Name     | Type    | Description          |
| -------- | ------- | -------------------- |
| `tokenA` | address | First token address  |
| `tokenB` | address | Second token address |
| `fee`    | uint24  | Fee tier             |

**Example:**

```
address pool = factory.getPool(USDC, WETH, 3000);require(pool != address(0), "Pool does not exist");
```

#### Checking Fee Tier Validity <a href="#user-content-checking-fee-tier-validity" id="user-content-checking-fee-tier-validity"></a>

```
function feeAmountTickSpacing(uint24 fee) external view returns (int24)
```

Returns the tick spacing for a fee tier, or `0` if the fee tier is not enabled.

**Parameters:**

| Name  | Type   | Description         |
| ----- | ------ | ------------------- |
| `fee` | uint24 | Fee amount to check |

**Example:**

```
int24 tickSpacing = factory.feeAmountTickSpacing(3000);require(tickSpacing != 0, "Fee tier not supported");
```

### Supported Fee Tiers <a href="#user-content-supported-fee-tiers" id="user-content-supported-fee-tiers"></a>

| Fee           | Tick Spacing | Use Case                             |
| ------------- | ------------ | ------------------------------------ |
| 100 (0.01%)   | 1            | Stablecoin pairs (e.g., USDC/USDT)   |
| 500 (0.05%)   | 10           | Correlated assets (e.g., WETH/stETH) |
| 3000 (0.30%)  | 60           | Most token pairs                     |
| 10000 (1.00%) | 200          | Exotic or high-volatility pairs      |


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