Natural language understanding technology, including sentiment, entity and syntax analysis.
Google Cloud Natural API is a free Text Analysis API that requires apiKey authentication, is served over HTTPS and has unconfirmed CORS support.
Enables easy integration of Google natural language understanding technologies into developer applications.
Details from cloud.google.com.

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The Google Cloud Natural API is provided by Google Cloud Documentation (cloud.google.com). Enables easy integration of Google natural language understanding technologies into developer applications.
Yes. The Google Cloud Natural API is listed in the Text Analysis 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 Google Cloud Natural API uses apiKey authentication, so you need to register for credentials before making requests.
CORS support for the Google Cloud Natural API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The Google Cloud Natural API is served over HTTPS, so it's safe to use in production.