[keycloak-user] Custom REST endpoint not associated with a specific REALM

Hi, We are looking to implement a REST endpoint that will be used to query the REALM information associated with a specified user. The REST endpoint will be publicly available and used as part of the Authentication process, identifying which Keycloak REALM should be used during the client authentication process. We've created REST endpoints that are available through a REALM, such as "/auth/realms/master/admin-extensions/...". Those specific REALMs are accessed post authentication. For this REST endpoint, we're looking to access it generically pre authentication. Is it possible to create a custom REST endpoint that's not associated with a specific REALM? Thanks, Michael