Unauthenticated search is still possible and allowed, just as long as you use a proper User Agent string. See https://musicbrainz.org/doc/Development/XML_Web_Se

Unauthenticated search is still possible and allowed, just as long as you use a proper User Agent string. See https://musicbrainz.org/doc/Development/XML_Web_Service/Version_2#Before_getting_started https://musicbrainz.org/doc/Development/XML_Web_Service/Vers... "Do I need an API key?" and "Do I need to provide authentication?" (In fact, I don't think there is a way to do authenticated searches.)