SEC EDGAR filings, XBRL financials, Form 4 insider trades, 8-K events and 13F holdings.
Filingrail API is a free Finance API that requires apiKey authentication, is served over HTTPS and has unconfirmed CORS support.

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Geocode an address, validate an email, track a flight or pull stock data with one account, one dashboard and one API key.
Finage is a stock, currency, cryptocurrency, indices, and ETFs real-time & historical data provider
US federal, state and local income tax calculation for 2026, with the source of every figure
Yes. The Filingrail 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 Filingrail API uses apiKey authentication, so you need to register for credentials before making requests.
CORS support for the Filingrail API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The Filingrail API is served over HTTPS, so it's safe to use in production.