Check if a pool exists (V1)

When adding a new or existing liquidity pool, the initial step is typically to verify if the liquidity pool already exists before determining the next course of action. The factory contract provides a method to retrieve the pool address, if it exists, as shown below.

Checking if the liquidity pool exists using SaucerSwap’s REST API is also a suitable alternative. For more information, see Get V1 liquidity pools

Get the existing liquidity pool if it exists

No gas cost — read-only call. Get the existing liquidity pool’s CREATE2 EVM address if it exists. If the pool does not exist on-chain, a zero address will be returned. Function name: getPair

Parameter Name	Description
address tokenA	EVM address of the first token
address tokenB	EVM address of the second token

function getPair(
  address tokenA,
  address tokenB
) external view returns (address pair);

The ordering of tokens for tokenA and tokenB does not matter.

When working with HBAR, use the wrapped HBAR token ID (WHBAR) for either tokenA or tokenB.

Code overview

JSON RPC

Resources:

import * as ethers from 'ethers'; //V6

//Set one of Hedera's JSON RPC Relay as the provider
const provider = new ethers.JsonRpcProvider(hederaJsonRelayUrl, '', {
  batchMaxCount: 1, //workaround for V6
});

//load ABI data containing the Factory's getPair function
const interfaces = new ethers.Interface(abi);

const factoryContract = new ethers.Contract(factoryEvmAddress, interfaces.fragments, provider);
const result = await factoryContract.getPair(tokenA, tokenB); //(tokenB, tokenA) will give same result
const poolEvmAddress = result; //address pool

Next steps

Create a new pool (V1)

Create the pool if it does not exist yet.

Fetch all pools (V1)

List every V1 pool from the REST API.

Create a new pool (V1)Fetch all pools (V1)

⌘I

Getting started

V1 guides

V2 guides

V3 order book

More guides

Security

AI

Check if a pool exists (V1)

Get the existing liquidity pool if it exists

Code overview

Next steps

Create a new pool (V1)

Fetch all pools (V1)

​Get the existing liquidity pool if it exists

​Code overview

​Next steps

Create a new pool (V1)

Fetch all pools (V1)

Get the existing liquidity pool if it exists

Code overview

Next steps