Thread:Extension talk:FlaggedRevs/API and FlaggedRevs (2)/reply

You can check if the article is reviewed with this: - https://fi.wikipedia.org/w/api.php?action=query&prop=info|flagged&titles=Turku

If stable_revid=lastrevid then page is reviewed and it doesn't have pending changes If stable_revid!=lastrevid then page is reviewed and it have pending changes if there is no flagged information then page is unreviewed

However i don't think that you can get information of date + author of old version with single query.