The API would provide a way for application developers to inform their users of the amount of credits required to perform an operation prior to them executing it. This would be useful for example when a user has access to an application but the developer has provided some extra paid functionality and wants to use AGO, but in doing so will consume credits that they want to charge the user for.
The API could work by taking the resource Id of the published AGO resource (service) and the proposed operation e.g. geocode n items against service with id xxxxxxxxxx.
