The Verify Auth Token API lets you verify that a user is signed in to Userbase. This is useful if you want the user to interact with a service separate from Userbase, such as another database, or only serve content to authenticated users for example. It returns successfully if the user is signed in.
curl 'https://v1.userbase.com/v1/admin/auth-tokens/$AUTH_TOKEN' \
-XGET \
-H 'Authorization: Bearer $ACCESS_TOKEN'