An equivalent to editcount for uploads (uploadcount?) would be useful for apps like Commons Android app. (See https://github.com/commons-app/apps-android-commons/pull/857.)
Commons Android app currently uses a Toolforge tool instead (For User:Whym it's https://tools.wmflabs.org/urbanecmbot/uploadsbyuser/uploadsbyuser.py?user=Whym .) Since this approach does not work well if we want to provide the app for non-Wikimedia wikis, I'd like to see it supported by MediaWiki itself.
Unlike the tool mentioned above, it would be good enough if the API can report the current user's upload count.