EBay said its marketplaces business, which includes its main auction website, saw the fastest growth since 2006.
The marketplaces make money by charging fees to potential sellers listing items for sale.
It also generates revenue from transaction fees for users of its online payment system, PayPal, which it is expanding beyond the internet to mobile devices and physical stores.
PayPal had 113.2 million active accounts at the end of the second quarter, up 13% from a year ago.
Earlier on Wednesday, a blog by an e-commerce software provider highlighted a speech made last month by eBay executive Devin Wenig in which he said the active user base on eBay's online marketplace was growing at more than 10% a year.