Pageview information about Wikimedia sites, which has been available for a while through the standalone Pageviews REST API [1], is now available in the action API as well, through the prop=pageviews [2], list=mostviewed [3] and meta=siteviews [4] API modules. An example: 

https://en.wikipedia.org/w/api.php?action=query&format=jsonfm&errorformat=plaintext&prop=pageviews&list=mostviewed&meta=siteviews&titles=Main+Page&formatversion=2&pvipdays=3&pvimlimit=3&pvisdays=3

The new API modules basically act as a proxy to the REST API, and are meant as a less flexible but more convenient alternative for people who already use the action API.

[1] https://wikitech.wikimedia.org/wiki/Analytics/PageviewAPI

[2] https://en.wikipedia.org/w/api.php?action=help&modules=query%2Bpageviews

[3] https://en.wikipedia.org/w/api.php?action=help&modules=query%2Bmostviewed

[4] https://en.wikipedia.org/w/api.php?action=help&modules=query%2Bsiteviews

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