Callook.info vs Wikipedia

Callook.info is a free, keyless lookup service for FCC-licensed US amateur radio callsigns, returning license status, operator class, name, and registered address as either JSON or XML. A live request for a real callsign returns a wildcard Access-Control-Allow-Origin header with no authentication required, confirming it's safe to call directly from browser code.

The MediaWiki action API that powers Wikipedia gives keyless access to full-text search, page content/extracts, revision history, and category membership across every language edition. A live probe of en.wikipedia.org/w/api.php confirms open, keyless reads and resolves the CORS story: browsers must append the documented `origin=*` query parameter (a plain Origin header alone is rejected as a "mismatch"), after which the response carries a wildcard Access-Control-Allow-Origin.