
Polish company data: 3M+ KRS and CEIDG entities with financial statements, people and rankings.
Compabase API is a free Business API that requires apiKey authentication, is served over HTTPS and has unconfirmed CORS support.
REST API for 3M+ Polish companies from KRS and CEIDG: search, financial statements, people, beneficial owners, public tenders, EU funds and compliance registers.
Details from compabase.com.

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The Compabase API is provided by Compabase (compabase.com). REST API for 3M+ Polish companies from KRS and CEIDG: search, financial statements, people, beneficial owners, public tenders, EU funds and compliance registers.
Yes. The Compabase API is listed in the Business 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 Compabase API uses apiKey authentication, so you need to register for credentials before making requests.
CORS support for the Compabase API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The Compabase API is served over HTTPS, so it's safe to use in production.