Exchange Rate MCP Server

import os import httpx from fastmcp import FastMCP from dotenv import load_dotenv load_dotenv() mcp = FastMCP("Exchange Rate MCP Server") EXCHANGE_RATE_API_KEY = os.getenv("EXCHANGE_RATE_API_KEY") if not EXCHANGE_RATE_API_KEY: raise EnvironmentError("EXCHANGE_RATE_API_KEY is not set in environment variables.") @mcp.tool async def convert_currency(amount: float, base_curr: str, target_curr: str) -> str: """Convert an amount from one currency to another using current exchange rates.""" try: async with httpx.AsyncClient() as client: response = await client.get(f"https://v6.exchangerate-api.com/v6/{EXCHANGE_RATE_API_KEY}/pair/{base_curr.upper()}/{target_curr.upper()}/{amount}") response.raise_for_status() data = response.json() if data.get("result") == "error": error_type = data.get("error-type", "unknown") if error_type == "unknown-code": raise Exception(f"Unknown currency code: {base_curr} or {target_curr}") elif error_type == "malformed-request": raise Exception("Invalid request format") elif error_type == "invalid-key": raise Exception("Invalid API key") elif error_type == "inactive-account": raise Exception("API account inactive") elif error_type == "quota-reached": raise Exception("API quota exceeded") else: raise Exception(f"API error: {error_type}") return f"{amount} {base_curr.upper()} = {data.get('conversion_result'):.2f} {target_curr.upper()} (Rate: {data.get('conversion_rate')})" except httpx.HTTPStatusError as e: raise Exception(f"HTTP error occurred: {e.response.status_code} - {e.response.text}") except httpx.RequestError as e: raise Exception(f"Request error occurred: {str(e)}") except Exception as e: raise Exception(f"Unexpected error occurred: {str(e)}") if __name__ == "__main__": mcp.run()