Get any website's favicon by URL (SVG/PNG/ICO), with JSON metadata and fallbacks.
Favicondl API is a free Art & Design API that requires no API key, is served over HTTPS and supports CORS, so it can be called from the browser.
Free favicon API: get any website's icon by URL with one GET request, no API key. Redirect to the image or get JSON with the icon URL and its source.
Details from favicondl.com.

Unified API suite · now live
Geocode an address, validate an email, track a flight or pull stock data with one account, one dashboard and one API key.
The Favicondl API is provided by favicondl (favicondl.com). Free favicon API: get any website's icon by URL with one GET request, no API key. Redirect to the image or get JSON with the icon URL and its source.
Yes. The Favicondl API is listed in the Art & Design 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 Favicondl API requires no authentication, so you can start making requests without signing up.
Yes. The Favicondl API supports CORS, so front-end JavaScript can call it directly.
Yes. The Favicondl API is served over HTTPS, so it's safe to use in production.