Radar-detected hail history for any US address from NOAA NEXRAD Level-III hail detections, by year.
Hail History API is a free Weather API that requires no API key, is served over HTTPS and supports CORS, so it can be called from the browser.
Free keyless API for radar-detected hail history at any US address or coordinate. NOAA NEXRAD Level-III hail detections, per year, back to 2007. No key, no signup, CORS open.
Details from hail-history-noaa.netlify.app.

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Yes. The Hail History API is listed in the Weather category of the public-apis directory, which only includes APIs that are free or have a free tier. Check its documentation for rate limits and paid plans.
No. The Hail History API requires no authentication, so you can start making requests without signing up.
Yes. The Hail History API supports CORS, so front-end JavaScript can call it directly.
Yes. The Hail History API is served over HTTPS, so it's safe to use in production.