VulDB API allows to initiate queries for one or more items along with transactional bots.
VulDB API is a free Security API that requires apiKey authentication, is served over HTTPS and has unconfirmed CORS support.

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