crypto-feargreed-mcp

Instructions

Implementation Reference

• main.py:62-66 (handler)

  The handler function for the 'get_current_fng_tool' tool. It is decorated with @mcp.tool() for registration and delegates to the helper get_current_fng() after logging.

  @mcp.tool()
  async def get_current_fng_tool(ctx: Context) -> str:
      """Get the current Crypto Fear & Greed Index as a tool."""
      ctx.info("Fetching current Fear & Greed Index")
      return await get_current_fng()

• main.py:14-32 (helper)

  Supporting resource function that implements the core logic of fetching and formatting the current Crypto Fear & Greed Index from the API endpoint.

  @mcp.resource("fng://current")
  async def get_current_fng() -> str:
      """Get the current Crypto Fear & Greed Index"""
      try:
          async with httpx.AsyncClient() as client:
              response = await client.get(API_URL, params={"limit": 1})
              response.raise_for_status()
              data = response.json()["data"][0]
              timestamp = datetime.fromtimestamp(int(data["timestamp"]))
              return (
                  f"Crypto Fear & Greed Index (as of {timestamp} UTC):\n"
                  f"Value: {data['value']}\n"
                  f"Classification: {data['value_classification']}"
              )
      except httpx.HTTPStatusError as e:
          return f"Error fetching current FNG: {str(e)}"
      except Exception as e:
          return f"Unexpected error: {str(e)}"