Warnely
Composite travel-safety scores for 180 countries (FCDO + US State + GPI + WGI + live incident wire), OpenAPI 3.1 spec, CC BY 4.0

Collaboratively edited knowledge base operated by the Wikimedia Foundation.
Wikidata API is a free Open Data API that requires OAuth authentication, is served over HTTPS and has unconfirmed CORS support.
Details from wikidata.org.

Unified API suite · now live
Geocode an address, validate an email, track a flight or pull stock data with one account, one dashboard and one API key.
Composite travel-safety scores for 180 countries (FCDO + US State + GPI + WGI + live incident wire), OpenAPI 3.1 spec, CC BY 4.0
Brazilian company profiles by CNPJ, CNAE establishment counts and municipality coordinates
The Wikidata API is provided by Wikidata (wikidata.org).
Yes. The Wikidata API is listed in the Open Data 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 Wikidata API uses OAuth authentication, so you need to register for credentials before making requests.
CORS support for the Wikidata API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The Wikidata API is served over HTTPS, so it's safe to use in production.