The Feed Beta API gives you the ability to:

• Download an entire category of items from a specific eBay marketplace.
• Download all the items listed in a specific day, category, and marketplace.
• Download the item group variation information for an item
• Curate the items off-line by item aspects, price, product, payment method, ship-to location, etc.
• Keep the item information up-to-date using hourly feed files.
• Track changes to the status of priority items within specified campaigns using daily priority item feed files.