Free APIGeo & WeatherNo keyOfficial

USGS Earthquake Catalog

Real-time and historical earthquakes as GeoJSON, fully free with no key

The USGS Earthquake Hazards Program publishes real-time earthquake data as GeoJSON via fixed summary feeds (CDN-cached, ~1 min refresh) and a parameterized FDSN event query for historical searches by time, magnitude and area. No API key, signup or auth is required, and CORS is open.

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Free tier

Free public US government data, no key.

Rate limits

No published hard limit or auth; send a meaningful User-Agent and avoid sustained bursts beyond ~5-10 req/s against the FDSN query service.

Auth

No key

Base URL

https://earthquake.usgs.gov

What you'd build with it

Alert or notify on significant quakes near a coordinate in real time
Map recent seismic activity on a dashboard
Query historical earthquakes for analysis or backtesting
Feed a Claude Skill that summarizes regional seismic risk

Key endpoints

GET/earthquakes/feed/v1.0/summary/{mag}_{period}.geojsonPrebuilt feeds, e.g. all_day, 2.5_week, significant_month
GET/fdsnws/event/1/queryQuery events by time, magnitude, region (GeoJSON/CSV/XML)
GET/fdsnws/event/1/countCount events matching filters

Members

Members get the runnable recipe

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