Is there an API to fetch information on the number of document transactions?

I am using the free 'trial' of PDF Services API in my project and I was hoping to add a usage subcommand to my CLI for bells and whistles, but I haven't found any way to fetch the number of used doc transactions/total left this month or anything like that.

For me, it's not an essential feature as my tool doesn't process many documents, but it is still a very useful feature.