10 Free APIs You Can Use Without an API Key (Just Send a Request)

No signup. No OAuth. No API key. Just send an HTTP request and get data back. Here are 10 APIs that work immediately: 1. Open-Meteo (Weather) import requests r = requests.get("https://api.open-meteo.com/v1/forecast", params={"latitude": 40.71, "longitude": -74.01, "current_weather": True}) print(f"NYC: {r.json()['current_weather']['temperature']}°C") 2. USGS Earthquakes r = requests.get("https://earthquake.usgs.gov/fdsnws/event/1/query", params={"format": "geojson", "minmagnitude": 5, "limit": 3}) for eq in r.json()['features']: print(f"M{eq['properties']['mag']} — {eq['properties']['place']}") 3. REST Countries r = requests.get("https://restcountries.com/v3.1/name/japan") c = r.json()[0] print(f"{c['name']['common']}: {c['population']:,} people") 4. Crossref (150M+ Academic Articles) r = requests.get("https://api.crossref.org/works", params={"query": "machine learning", "rows": 3}) for item in r.json()['message']['items']: print(item['title'][0][:60]) 5. OpenAlex (250M+ Papers) r = re