Hi Sarah
Good Question!!
Please find below details for reference.
A standard license comes with 1000 credits per month and advanced licenses come with 2000 per month for the geocoding. Paid plans are available for additional 10,000 or 20,000 credits per month, which a user can upgrade anytime by clicking the Upgrade Plan link on the Pro Tab. However, the most important thing is those credits, which are unused & cannot be rolled over to the next month.
Based on the accuracy levels of geocoding services, different amounts of credits are charged as per the usage: City/Postcode level : 1 credit will be charged per table row processing; Moreover, for the Street/Rooftop level - 5 credits will be charged for the same.
Hope this helps!
-Thanks