app/price_fetcher.py

"""
Background price cache using public CoinGecko
(If you have Gemini keys, swap endpoints & add auth)
"""
import httpx, logging, os

COINGECKO_URL = (
    "https://api.coingecko.com/api/v3/simple/price"
    "?ids=bitcoin,ethereum,dogecoin&vs_currencies=usd"
)

CURRENT_PRICES = {"bitcoin": "‑‑", "ethereum": "‑‑", "dogecoin": "‑‑"}

def fetch_prices() -> None:
    global CURRENT_PRICES
    try:
        resp = httpx.get(COINGECKO_URL, timeout=5)
        resp.raise_for_status()
        data = resp.json()
        CURRENT_PRICES = {
            "bitcoin": data["bitcoin"]["usd"],
            "ethereum": data["ethereum"]["usd"],
            "dogecoin": data["dogecoin"]["usd"],
        }
        logging.info("⛓  prices updated")
    except Exception as e:
        logging.warning(f"Price fetch failed: {e}")