
RSS reader.
The Old Reader API is a free News API that requires apiKey authentication, is served over HTTPS and has unconfirmed CORS support.
The Old Reader API.
Details from github.com.

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The The Old Reader API is provided by theoldreader (github.com). The Old Reader API.
Yes. The The Old Reader API is listed in the News 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.
Yes. The The Old Reader API uses apiKey authentication, so you need to register for credentials before making requests.
CORS support for the The Old Reader API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The The Old Reader API is served over HTTPS, so it's safe to use in production.