cryptopanic_news_server.py

from mcp.server.fastmcp import FastMCP
from cryptopanic_news import get_posts
import os
from dotenv import load_dotenv
load_dotenv(override=True)

mcp = FastMCP("cryptopanic_news_server")

@mcp.tool()
async def get_crypto_news(currencies_ls: list | str | None = None) -> str:
    """Fetch latest cryptocurrency news from CryptoPanic.

    Args:
        currencies_ls: The list of cryptocurrency symbols to filter news by. Accepts a single string (e.g. "BTC") or a list of symbols (e.g. ["HYPE", "ETC", "BTC", "XRP"]). 

        If set to None, retrieves the general CryptoPanic news feed 
        without filtering by any specific currency.
    """
    token = os.getenv("CRYPTOPANIC_API_KEY")
    if not token:
        return "Error: CRYPTOPANIC_API_KEY not set."

    # Allow a single string or a list
    if isinstance(currencies_ls, str):
        currencies_ls = [currencies_ls]

    data = get_posts(
        auth_token=token,
        kind="news",
        currencies=currencies_ls,
        page=1
    )

    if not isinstance(data, dict):
        return f"Error: Unexpected API response: {data!r}"

    results = []
    for post in data.get("results", []):
        title = post.get("title") or "No title"
        desc = post.get("description") or ""
        pub  = post.get("published_at") or "Unknown time"
        results.append(f"title: {title}\n{desc[:200]}\npublished at: {pub}\n")

    return "\n".join(results) if results else "No recent crypto news found."

if __name__ == "__main__":
    mcp.run(transport='stdio')