Quite expensive though. When I use an API, I usually assume (1) there will be some significant base volume, and (2) this volume has no upper bound, depending on my users behavior. For ~750 € you can only process 1k documents during the month... hard-capped? The price schemes seem to target entreprise but entreprises usually have bigger volumes than that. (But maybe I confuse API calls and document processing with your product?)
But it’s nice you released SDK in several common languages.
Good luck!