
Best open-source password manager.
BitWarden API is a free Security API that requires OAuth authentication, is served over HTTPS and has unconfirmed CORS support.
Details from bitwarden.com.

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The BitWarden API is provided by Bitwarden (bitwarden.com).
Yes. The BitWarden 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 BitWarden API uses OAuth authentication, so you need to register for credentials before making requests.
CORS support for the BitWarden API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The BitWarden API is served over HTTPS, so it's safe to use in production.