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OutageDeck API is a free Development API that requires no API key, is served over HTTPS and supports CORS, so it can be called from the browser.
Full reference for the OutageDeck public API: authentication, rate limits, the error contract, every endpoint with examples, and the OpenAPI 3.1 document.
Details from outagedeck.com.

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The OutageDeck API is provided by OutageDeck (outagedeck.com). Full reference for the OutageDeck public API: authentication, rate limits, the error contract, every endpoint with examples, and the OpenAPI 3.1 document.
Yes. The OutageDeck API is listed in the Development 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 OutageDeck API requires no authentication, so you can start making requests without signing up.
Yes. The OutageDeck API supports CORS, so front-end JavaScript can call it directly.
Yes. The OutageDeck API is served over HTTPS, so it's safe to use in production.