
Point-in-time SEC EDGAR fundamentals over /v1.
Arkleon API is a free Finance API that requires apiKey authentication, is served over HTTPS and has unconfirmed CORS support.
Point-in-time SEC EDGAR fundamentals, as filed and keyed to the date each filing became public. Query any historical date for the filings of record known then.
Details from arkleon.com.

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The Arkleon API is provided by Arklēon (arkleon.com). Point-in-time SEC EDGAR fundamentals, as filed and keyed to the date each filing became public. Query any historical date for the filings of record known then.
Yes. The Arkleon 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 Arkleon API uses apiKey authentication, so you need to register for credentials before making requests.
CORS support for the Arkleon API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The Arkleon API is served over HTTPS, so it's safe to use in production.