Ncdjango has two built-in interfaces. The first is a partial implementation of the ArcGIS Server Rest API <arcgis> (http://resources.arcgis.com/en/help/rest/apiref/index.html?mapserver.html). The second is a simple data <data> API for querying things like value range, classifications of data, and data through time (for time-enabled datasets) at a single point.
You can also add your own interface, which is explained in custom.
arcgis data custom