
Social news for CS and entrepreneurship.
HackerNews API is a free Social API that requires no API key, is served over HTTPS and has unconfirmed CORS support.
Documentation and Samples for the Official HN API.
Details from github.com.

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The HackerNews API is provided by HackerNews (github.com). Documentation and Samples for the Official HN API.
Yes. The HackerNews API is listed in the Social 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 HackerNews API requires no authentication, so you can start making requests without signing up.
CORS support for the HackerNews API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The HackerNews API is served over HTTPS, so it's safe to use in production.