Online accounting software, built for your business.
Zoho Books API is a free Finance API that requires OAuth authentication, is served over HTTPS and has unconfirmed CORS support.

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Yes. The Zoho Books API is listed in the Finance 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 Zoho Books API uses OAuth authentication, so you need to register for credentials before making requests.
CORS support for the Zoho Books API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The Zoho Books API is served over HTTPS, so it's safe to use in production.