This year, Bill Me Later's total payment volume should reach $1 billion, the companies said in a presentation to investors.

The Danish classifieds sites, one linked to newspaper Den Blå Avis and one for automobile buyers, will bring eBay an additional 186 million monthly page views, the company said. It now owns classifieds sites covering 1,000 cities in 20 countries.

The two sites "give us technology we can use to improve our other classified sites," Donahoe said. Worldwide, eBay has more classifieds traffic and three to four times more classifieds revenue than the well-known classifieds site Craigslist, he said, adding that eBay also holds a stake in Craigslist.

Alongside these acquisitions, eBay said it will lay off 1,000 staff and several hundred temporary workers. The worldwide layoffs will allow the company to cut costs, it said, although they will result in restructuring charges of up to $80 million in the fourth quarter.

"We have been very strategic about where these reductions will take place," said Donahoe. The cuts will save the company around $150 million a year, he said.