
US cold plunge and sauna venues with dated, source-quoted temperatures and prices.
FindSaunaPlunge API is a free Health API that requires no API key, is served over HTTPS and supports CORS, so it can be called from the browser.
Free JSON feed of 546 hand-checked US sauna and cold plunge venues — addresses, coordinates, temperatures, prices, check dates. CC BY 4.0, no key needed.
Details from findsaunaplunge.com.

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The FindSaunaPlunge API is provided by FindSaunaPlunge (findsaunaplunge.com). Free JSON feed of 546 hand-checked US sauna and cold plunge venues — addresses, coordinates, temperatures, prices, check dates. CC BY 4.0, no key needed.
Yes. The FindSaunaPlunge API is listed in the Health 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 FindSaunaPlunge API requires no authentication, so you can start making requests without signing up.
Yes. The FindSaunaPlunge API supports CORS, so front-end JavaScript can call it directly.
Yes. The FindSaunaPlunge API is served over HTTPS, so it's safe to use in production.