From WikiApiary, tracking ApiOutput and over 3,200 other skins

Name: ApiOutput (ID: 164686) Default skin image
Author(s): No authors provided.
Description: This is the skin used to show results when the API is called by humans. It was introduced with MW 1.24.
Related extensions: This skin has no related extensions.
Derived from: This skin is not derived from another skin.
Website count: 3 (0.02%) (Skipped on 10447 sites.)
Websites using as default 0
Websites skipping it 10447
Segments Day: 4 Hour: 22

ApiOutput is not default on any website running MediaWiki 1.22 or greater.

ApiOutput is an available skin on websites: