solana-agent-kit/src/langchain/jupiter/fetch_price.ts

import { Tool } from "langchain/tools";
import { SolanaAgentKit } from "../../agent";

/**
 * Tool to fetch the price of a token in USDC
 */
export class SolanaFetchPriceTool extends Tool {
  name = "solana_fetch_price";
  description = `Fetch the price of a given token in USDC.

  Inputs:
  - tokenId: string, the mint address of the token, e.g., "JUPyiwrYJFskUPiHa7hkeR8VUtAeFoSYbKedZNsDvCN"`;

  constructor(private solanaKit: SolanaAgentKit) {
    super();
  }

  async _call(input: string): Promise<string> {
    try {
      const price = await this.solanaKit.fetchTokenPrice(input.trim());
      return JSON.stringify({
        status: "success",
        tokenId: input.trim(),
        priceInUSDC: price,
      });
    } catch (error: any) {
      return JSON.stringify({
        status: "error",
        message: error.message,
        code: error.code || "UNKNOWN_ERROR",
      });
    }
  }
}