After repeated queries, the online auction company said Friday that it will not institute such a rule in the United States. But it remains unclear whether eBay will still try it in other countries. eBay often tests big changes in smaller markets before expanding them worldwide, and says it is open to that in this case.

"We are going to take learnings from it and apply them accordingly," said eBay spokesman Usher Lieberman.

eBay says it wants to reduce disputes and restore trust in its marketplace with the PayPal-only plan. Because eBay and PayPal can share information on each transaction, eBay says use of PayPal allows it to stop fraud more efficiently than outside payment services. Pressing that safety argument in a heated discussion with Australian users, an eBay executive compared the new rule to banning the sale of heroin on street corners.

But critics lament that PayPal is costlier than other payment options, and they suspect eBay is just interested in increasing PayPal's revenue. Australian banks say the plan will eliminate competition.

"Competition will be restricted, innovation and development will be constrained, new entry will be discouraged and PayPal will be able to increase fees and charges to eBay users," the Australian Bankers Association said in a filing Thursday.

Because eBay sellers are commonly independent merchants who don't accept credit cards, PayPal acts as a go-between. Buyers use their credit cards and bank account information to make payments, and PayPal relays the funds to sellers' PayPal accounts, charging them 30 cents plus a commission -- up to 4.4 percent in Australia. Bank transfers, the second-most common method of payment on eBay Australia, cost 20 cents each.

Australia's bankers group says PayPal is not as immune to fraud as eBay claims. While PayPal does keep bank and credit-card account information secret between trading partners, the bankers group said it does not verify identity as banks do.

eBay's financial reports indicate that PayPal is getting better at cracking down. Its loss rate is 0.24 percent, down from 0.33 percent a year ago. That means that for every $100 transacted with the service, PayPal has to eat 24 cents because of fraud.

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