Read and write Tumblr Data.
Tumblr API is a free Social API that requires OAuth authentication, is served over HTTPS and has unconfirmed CORS support.
Tumblr is a place to express yourself, discover yourself, and bond over the stuff you love. It's where your interests connect you with your people.
Details from tumblr.com.

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The Tumblr API is provided by Tumblr (tumblr.com). Tumblr is a place to express yourself, discover yourself, and bond over the stuff you love. It's where your interests connect you with your people.
Yes. The Tumblr 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 Tumblr API uses OAuth authentication, so you need to register for credentials before making requests.
CORS support for the Tumblr API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The Tumblr API is served over HTTPS, so it's safe to use in production.