ProPay, a distant second to X.com in person-to-person payments, is positioning itself for spiraling growth through an alliance with AuctionWatch.com, the monster of auction Web sites.

X.com, however, will be difficult to catch. The online financial services provider has three million PayPal person-to-person payment accounts, compared with ProPay's previously reported 100,000. Plus, X.com already has an alliance with AuctionWatch, which monitors activities at many popular auction sites, including Ebay.com, Yahoo.com, and Amazon.com.

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