Wikimetrics allows you to select a set of users, also known as a "cohort", select a metric to be computed for each of these users, and retrieve the response in JSON or CSV format.
Owner-only
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Applicable project
meta.wikimedia.org
OAuth "callback URL"
https://metrics.wmflabs.org/auth/meta_mw
Allow consumer to specify a callback in requests and use "callback" URL above as a required prefix.