Article classes are not part of our schema at the moment, and are not included in the response payloads of any of our APIs. Filtering is possible on our On-demand and Realtime streaming API using any of the fields on our schema. The Snapshots contain all the articles in a project-namespace. If using snapshots, you may choose to filter out the articles based on fields of the schema on your end, as per your use-case.
It is worth noting that while the highest quality assessment levels (know as “featured” and “good” in English) are reviewed in accordance to stringent standards, the community on each language project has independent quality assessment systems and processes