Is it possible to check service credit usage in ArcGIS Online for Organizations?

Yes, it is possible to check service credit usage in ArcGIS Online for Organizations when users are signed in to the organization with the correct user types, roles, and privileges. Administrators may use the following steps to view detailed account usage:

1. Log in to the ArcGIS Online account.
2. Navigate to the Organization tab.
3. Select the Status page.

Detailed account usage for the users' organization is available for perusal within the page. For more details, refer to ArcGIS Online: View and report status.
An alternative is to use the dashboard, which receives information and reports detailing activities in relation to groups, users, and items. This free JavaScript web application provides a thorough service credit usage overview. The overview includes activity information, such as the most active user within an organization and the number of registered services.