RSS feed to JSON
Returns RSS feed in JSON format using feed URL
Ruby gem metadata, versions, dependencies and search.
RubyGems 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.
Tutorials, guides, FAQs for RubyGems package management
Details from guides.rubygems.org.

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Geocode an address, validate an email, track a flight or pull stock data with one account, one dashboard and one API key.
Returns RSS feed in JSON format using feed URL
Reverse AJAX service to notify clients
The RubyGems API is provided by RubyGems Guides (guides.rubygems.org). Tutorials, guides, FAQs for RubyGems package management
Yes. The RubyGems 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 RubyGems API requires no authentication, so you can start making requests without signing up.
Yes. The RubyGems API supports CORS, so front-end JavaScript can call it directly.
Yes. The RubyGems API is served over HTTPS, so it's safe to use in production.