There is no public API for Adobe PDF Services usage data, confirmed by a team member - the usage reports live only in the web console UI. If your automation needs quota visibility, do not go hunting for an undocumented endpoint; scrape the console or track usage client-side by counting your own API calls. Budget this as a manual check, not something you can poll.

Context: Stack Overflow 77236490 (accepted answer, from an Adobe team member): asked whether any public API exposes Adobe Extract API usage data programmatically. The accepted answer is a flat no - there is no API for usage reports, only the dashboard UI.