EBay Inc.'s PayPal has begun restricting accounts of people it suspects of using the payment service to place bets on the NCAA basketball championship tournament.
PayPal has sent alerts to some users who have used the service in connection with March Madness wagers, saying that their account use has been "limited."
"After a recent review of your account activity, it has been determined that you are in violation of PayPal's Acceptable Use Policy regarding your sales / offers of March Madness sports pool," a representative of PayPal's brand risk management division wrote in an e-mail.
The user agreement for PayPal, eBay's fastest-growing business, prohibits U.S. account use for sending or receiving payments for "activities that involve gaming and/or any other activity with an entry fee and a prize." The widely followed men's college basketball championship kicks off this week.
The e-mail asks the user to sign an online "Acceptable Use Policy affidavit" to regain full use of the account.
Bergen Kay, a spokeswoman for San Jose, Calif.-based PayPal, declined to comment on how the company's system identifies alleged gamblers.
"PayPal follows all the legal and regulatory rules in the U.S. as it relates to gambling," she said.