Why can't I swap with some SPL tokens when I use Jupiter v6 Swap API?

Question

I am gonna buy and sell SPL tokens using Jupiter Quote API and Swap API. My code works with some tokens but I failed with some tokens. However, I can see lots of holders for those tokens on Solcan. I am not sure what is wrong.

This is main code snippet.

import { Wallet } from "@project-serum/anchor";
import axios from "axios";

const JUP_API = "https://quote-api.jup.ag/v6"; 

export const getSwapInfo = async (tokenA: string, tokenB: string, amount: number, slippageBps: number) => {
  const res = await axios.get(`${JUP_API}/quote?inputMint=${tokenA}&outputMint=${tokenB}&amount=${amount}&slippageBps=${slippageBps}`);
  const swapinfo = res.data;
  return swapinfo;
  // Get the serialized transactions to perform the swap
};

export const getSwapTransaction = async (quoteResponse: any, anchorWallet: Wallet) => {
  const swapResponse = await axios.post(`${JUP_API}/swap`, {
    // quoteResponse from /quote api
    quoteResponse,
    userPublicKey: anchorWallet.publicKey.toString(),
    wrapAndUnwrapSol: true,
    prioritizationFeeLamports: 200000, // or custom lamports: 1000
  });
  return swapResponse.data.swapTransaction;
};

  const connection = new Connection(RPC_URL, "confirmed");
  const tokenDecimals = await getTokenDecimals(connection, tokenAddress);
  const slippageBps = parseInt(process.env.SLIPPAGEBPS || "") || 50;
  let swapInfo: any;
  swapInfo = await getSwapInfo(
    NATIVE_MINT.toBase58(),
    tokenAddress,
    amount * LAMPORTS_PER_SOL,
    slippageBps
  );

  const swapTransaction = await getSwapTransaction(swapInfo, anchorWallet);
  const swapTransactionBuf = Buffer.from(swapTransaction, "base64");
  const latestBlockHash = await connection.getLatestBlockhash();
  const versionedTransaction =
    VersionedTransaction.deserialize(swapTransactionBuf);
  versionedTransaction.message.recentBlockhash = latestBlockHash.blockhash;
  versionedTransaction.sign([anchorWallet.payer]);

Answer 1

I tried with your code and it worked well.

But if you have issues for some SPL tokens, I think you need to update Jupiter v6 API.

Jupiter v6 API is already old and you can use new API version.

Please check this link: https://station.jup.ag/docs/.

I tried with this API - "https://api.jup.ag/swap/v1" and it also worked well.

I hope this helps you.