
Plain-English explanations of US public companies with SEC filings and earnings data.
Zelothorn API is a free Finance API that requires no API key, is served over HTTPS and supports CORS, so it can be called from the browser.
A JSON API returning plain-language company summaries, earnings beat/miss results, and SEC filings. GET /api/v1/company/:ticker.
Details from zelothorn.com.

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US market data from SEC, FINRA, CFTC and the Fed: filings, insiders, earnings dates, short interest
The Zelothorn API is provided by Zelothorn Developer API (zelothorn.com). A JSON API returning plain-language company summaries, earnings beat/miss results, and SEC filings. GET /api/v1/company/:ticker.
Yes. The Zelothorn 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.
No. The Zelothorn API requires no authentication, so you can start making requests without signing up.
Yes. The Zelothorn API supports CORS, so front-end JavaScript can call it directly.
Yes. The Zelothorn API is served over HTTPS, so it's safe to use in production.