The Auxiliary Data Interface Delivery Point (AUXIP) is the pick-up point for Sentinel Auxiliary products.  The AUXIP allows clients to straightforwardly discover and retrieve available products through standard interfaces, in this case an OData RESTful API. Clients of the AUXIP are intended to be downloaders whose principal use case requires systematic (or at least regular) retrieval of published Sentinel Auxiliary data products. Examples of AUXIP clients include Production services (both systematic and on-demand), which use the Auxiliary data for the generation of products, Long Term Archives (LTAs), Sentinel Data Hubs (which in turn make the Auxiliary products available to end users), end-to-end Operations Performance monitoring, Reference System, and possibly clients requiring data for Instrument and Product Performance investigations.

The AUXIP is the point of retrieval for newly published Sentinel Auxiliary data products and, as such, it is managed by the various services delivering Auxiliary data. These include the Auxiliary Data Gathering Service the POD Service and the Cal/Val Service. Auxiliary products are supplied on a rolling archive, retention period for the Auxiliary data is specified in the technical specifications for each service, the main purpose of the rolling archive is to provide a buffer allowing the recovery of data in case of unavailability. The API and standard use scenario allow authorized users to discover, with a simple set of filters, the list of products which need to be retrieved in batches, for example since the last check, and then to perform the downloads.

In common with the other Interface Delivery Points, data published by authorized services are to be also registered with the Traceability Service to ensure a long term record the authenticity of all data within the CSC GS.