Bookmarking service.
Pocket API is a free Documents & Productivity API that requires OAuth authentication, is served over HTTPS and has unconfirmed CORS support.

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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.
HTML and URL to PDF API with templates and a free tier
Yes. The Pocket API is listed in the Documents & Productivity 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 Pocket API uses OAuth authentication, so you need to register for credentials before making requests.
CORS support for the Pocket API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The Pocket API is served over HTTPS, so it's safe to use in production.