Credits Pricing

Credits are the currency used in ArcGIS Online to purchase premium services including feature storage, analysis tools, and premium data. Credits are included with every ArcGIS Online subscription. Additional credits can be purchased and added to your subscription at any time.

To purchase credits you must have a 'foundational' user type.  Every subscription requires at least one foundational user type to activate and administer ArcGIS Online or ArcGIS Enterprise. Creator users and GIS Professional users are the two foundational user types.  You can purchase one of these user types here