
The Blogger APIs allows client applications to view and update Blogger content.
Blogger API is a free Social API that requires OAuth authentication, is served over HTTPS and has unconfirmed CORS support.
Get an overview and get started links for the API that enables client applications to view and update Blogger content.
Details from developers.google.com.

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The Blogger API is provided by Google for Developers (developers.google.com). Get an overview and get started links for the API that enables client applications to view and update Blogger content.
Yes. The Blogger 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.
Yes. The Blogger API uses OAuth authentication, so you need to register for credentials before making requests.
CORS support for the Blogger API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The Blogger API is served over HTTPS, so it's safe to use in production.