Shariah-compliant stock and ETF screening across 5 methodologies, zakat and purification.
Halal Terminal API is a free Finance API that requires apiKey authentication, is served over HTTPS and supports CORS, so it can be called from the browser.
Details from api.halalterminal.com.

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The Halal Terminal API is provided by Halal Terminal API (api.halalterminal.com).
Yes. The Halal Terminal 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 Halal Terminal API uses apiKey authentication, so you need to register for credentials before making requests.
Yes. The Halal Terminal API supports CORS, so front-end JavaScript can call it directly.
Yes. The Halal Terminal API is served over HTTPS, so it's safe to use in production.