Standard Service using OData channel to get inventory data

Hi Experts,

       I have a requirement to get the inventory data using OData channel.I referred the following link & go through some sample gateway services.

http://scn.sap.com/docs/DOC-31221

There I saw the sample gateway to access flight details as well as bank details.My doubt is these services are standard one or custom one? Is there any standard services available to get data outside? If yes which all are standard services which is related to Inventory Part?

Thanks & Regards,

Muhammed Riyas V A