Aspect filters refine (limit) the number of items returned by a find request. Obtain input values for aspectFilter fields from an aspectHistogramContainer returned in the response of a previous query.

By issuing a series of find queries, you can continually refine the items returned in your responses. Do this by repeating a query using the aspect values returned in one response as the input values to your next query.

For example, the aspectHistogramContainer in a response on Men's Shoes could contain an aspect of Size, along with "aspect values" for the different sizes currently available in Men's Shoes. By populating aspectFilter fields with the values returned in an aspectHistogramContainer, you can refine the item results returned by your new query.

Note: If a call that specifies an outputSelector value of AspectHistogram returns aspectHistogramContainer.domainName, this is a sign that aspect histogram data might not be returned if you also specify an aspectFilter in the next call. To ensure that aspect histogram data is returned for the next call, add a domainFilter to the call as well.

Specifies the category from which you want to retrieve item listings. This field can be repeated to include multiple categories.

If a specified category ID doesn't match an existing category for the site, eBay returns an invalid-category error message. To determine valid categories, use the Shopping API GetCategoryInfo call.

Up to three (3) categories can be specified.

Category searches are not supported on the eBay Italy site (global ID EBAY-IT) at this time.

Restricts results to items listed within the specified domain. Domains are a buy-side grouping of items. such as shoes or digital cameras. A domain can span multiple eBay categories.

Reduce the number of items returned by a find request using item filters. Use itemFilter to specify name/value pairs. You can include multiple item filters in a single request.

Defines what data to return, in addition to the default set of data, in a response.

If you don't specify this field, eBay returns a default set of item fields. Use outputSelector to include more information in the response. The additional data is grouped into discrete nodes. You can specify multiple nodes by including this field multiple times, as needed, in the request.

If you specify this field, the additional fields returned can affect the call's response time (performance), including in the case with feedback data.