The eBay Buy Feed API provides access to a rich selection of items and provides details on those items to users of the developer's website or application. A list of possible categories of items is available through the eBay Taxonomy API. The feeds are refreshed once per day and do not provide real time prices, availability, etc. Feed files are provided in .gzip TSV format.
In its effort to "deliver a developer-centric platform", eBay today announced that it is making its image recognition technology available to developers through an Image Search API. The API gives developers the ability to implement image search functionality into their apps.