Fetching Pair Reserves

Fetching live reserves is useful for knowing the liquidity on each side of the pair before you trade. The snippet below re-uses the wallet client you created in Quick Start, so no extra setup is needed.

• If you are following our example using Avalanche Fuji, you can use the Address 0x237591AaF2FCCb34464Ceae9EeA1eb6f375843AF .
• If you are trying to swap in a mainnet chain, you can check out Find all available Pairs

1. Pick a pair address

// AUSD / CTK pair on Avalanche Fuji Testnet
const TESTNET_PAIR_AUSD_CTK = '0x237591AaF2FCCb34464Ceae9EeA1eb6f375843AF';

In order to query the reserves from the contract, we'll call the methods reserve0 and reserve1

2. Helper to read raw reserves

/**
 * Returns the raw on-chain reserves (no decimal conversion).
 */
async function getPairReserves(
  pair: `0x${string}`,
): Promise<{ reserve0: bigint; reserve1: bigint }> {
  const reserve0 = await client.readContract({
    address: pair,
    abi: stableSwapAbi,
    functionName: "reserve0",
  });

  const reserve1 = await client.readContract({
    address: pair,
    abi: stableSwapAbi,
    functionName: "reserve1",
  });

  return { reserve0, reserve1 };
}

3. Run the query

(async () => {
  const { reserve0, reserve1 } = await getPairReserves(TESTNET_PAIR_AUSD_CTK);

  console.log(`Reserves token0 (AUSD – 6 dec):`, reserve0);
  console.log(`Reserves token1 (CTK  – 18 dec):`, reserve1);
})();

Reserves token0 (AUSD – 6 dec): 1000000000000n
Reserves token1 (CTK  – 18 dec): 1000000000000000000000000n

This is the value stored by the contract. In order to convert this units to human readable values, we'll need to divide the output by the ERC20 token decimals.