By Alistair Barr

SAN FRANCISCO (Reuters) - EBay Inc reported holiday quarter results that just beat Wall Street expectations, but the e-commerce company also gave a cautious forecast for 2013.

EBay shares climbed 1.2 percent to $53.53 in after-hours trading following the announcement.

Expectations were high ahead of the results because sales data from outside sources suggested strong sales growth from eBay's online marketplace and a solid increase in transactions processed by the company's PayPal payments business.

EBay's online marketplace, one of the largest in the world, has lagged behind the growth of e-commerce and Amazon.com Inc for several years. But under Chief Executive John Donahoe, eBay has invested to improve the buying experience by upgrading search capabilities and prodding sellers to provide more services such as free shipping and easier returns.

The explosive growth of mobile shopping and popular mobile shopping applications have also attracted hundreds of thousands of new consumers to eBay's marketplace in the past year.

On Wednesday, eBay said fourth-quarter revenue jumped 18 percent to $3.99 billion. Profit came in at $927 million, or 70 cents a share, in the period. That compares with profit of $789 million, or 60 cents a share, in the same quarter last year.

EBay was expected to earn 69 cents a share on revenue of $3.98 billion, according to Thomson Reuters I/B/E/S.

"Generally speaking the results are very much in line with expectations," said R.J. Hottovy, an equity analyst at Morningstar.

EBay forecast 2013 revenue of $16 billion to $16.5 billion and profit of $2.70 to $2.75 a share. Wall Street was calling for revenue of $16.3 billion and profit of $2.74 a share, according to Thomson Reuters I/B/E/S.

(Reporting By Alistair Barr; Editing by Bernard Orr)