The Marketplace Insights API enables you with the ability to search for sold items on eBay by keyword, GTIN, category, and more. It searches for sold eBay items by various URI query parameters and retrieves the sales history of the items. This API uses the resource for item_sales to retrieve the sales history of eBay items that have been sold up to 90 days in the past. It allows you to search by keyword, category, eBay product ID (ePID), or GTIN, or a combination. Ebay is an online marketplace.