F1 season schedule with UTC session start times as JSON, RSS and iCal.
WhensTheRace API is a free Sports & Fitness API that requires no API key, is served over HTTPS and supports CORS, so it can be called from the browser.
The F1 2026 calendar as free JSON + RSS + JSON Feed. No API key, CORS-open, fetch() it from any site.
Details from whenstherace.com.

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The WhensTheRace API is provided by When's the Race (whenstherace.com). The F1 2026 calendar as free JSON + RSS + JSON Feed. No API key, CORS-open, fetch() it from any site.
Yes. The WhensTheRace API is listed in the Sports & Fitness 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 WhensTheRace API requires no authentication, so you can start making requests without signing up.
Yes. The WhensTheRace API supports CORS, so front-end JavaScript can call it directly.
Yes. The WhensTheRace API is served over HTTPS, so it's safe to use in production.