solana-agent-kit/src/tools/fetch_price.ts

import { PublicKey } from "@solana/web3.js";

/**
 * Fetch the price of a given token quoted in USDC using Jupiter API
 * @param tokenId The token mint address
 * @returns The price of the token quoted in USDC
 */
export async function fetchPrice(tokenId: PublicKey): Promise<string> {
  try {
    const response = await fetch(`https://api.jup.ag/price/v2?ids=${tokenId}`);

    if (!response.ok) {
      throw new Error(`Failed to fetch price: ${response.statusText}`);
    }

    const data = await response.json();

    const price = data.data[tokenId.toBase58()]?.price;

    if (!price) {
      throw new Error("Price data not available for the given token.");
    }

    return price;
  } catch (error: any) {
    throw new Error(`Price fetch failed: ${error.message}`);
  }
}