The country's credit-card giants are gearing up to slug it out at the checkout counter once again.

After years of prohibiting merchants who accept its cards from steering customers to other brands, American Express Co. is lifting those restrictions.

The change comes after a federal judge in February found that AmEx's rules on the matter were anticompetitive; a separate court this week denied the company's request to keep the rules in place pending its appeal.

That means starting next month, merchants will be able to offer discounts or rebates to customers paying with a card from Visa Inc. or MasterCard Inc. or display signs showing which card brand they prefer. Visa and MasterCard also could negotiate lower fees with certain merchants in exchange for the merchant agreeing to steer customers toward their cards.

Merchants, who pay a percentage of each card transaction to card-issuing banks, have long griped that they pay more when customers swipe an AmEx card than when they use other types of plastic.

"These fees are a part of doing business, but you'd be silly not to consider all of your options," said Evan Johnson, an owner of Rocky's Aqua Restaurant in Clinton, Conn. The seafood restaurant has a "We prefer Visa" sticker posted near the front door, which Mr. Johnson says is a relic of the card firm's advertising campaign from the 1990s.

AmEx says it will remove the prohibition on customer steering as it pursues its appeal. "Steering is not a good thing for consumers and we believe many merchants agree," the company said in a statement.

MasterCard already is planning to take advantage of merchants' new flexibility, spreading the word to its employees who deal with merchant contracts, says Chris McWilton, president of North America for the Purchase, N.Y.-based network.

He declined to comment on MasterCard's specific plans to promote its brand to merchants who also accept AmEx, but "these are all things we have been thinking about for some time because we saw this coming down the pike."

A spokeswoman for Visa declined to comment.

Merchant fees vary widely depending on which type of card is used, along with other costs that can be added by middlemen processors. And large merchants are often able to use their size to negotiate lower fees with the card networks. The fee structure has become more complicated in recent years as lenders issued cards that are loaded with rewards and other perks. Such cards are more expensive for merchants to accept than nonrewards cards, and are closer to the rates that AmEx charges.

For example, some retailers will pay 1.47% of a transaction plus another 10 cents when a customer uses a plain-vanilla Visa credit card, but the rate jumps to 2.10% plus 10 cents for a high-end Visa rewards card, according to a public listing of Visa's rates. The merchant may also pay other fees to middlemen for those Visa transactions.

AmEx charged an average rate of 2.49% of each transaction in the first quarter, according to a regulatory filing. In a trial last summer, several AmEx executives testified that the company no longer maintains a premium over Visa and MasterCard rates. The six-week trial stemmed from a 2010 lawsuit in which the Justice Department contended that AmEx's prohibition on steering inhibits competition and raises fees for consumers.

It isn't clear how or if business owners will try to sway customers to use certain cards, including debit cards that are cheaper for merchants than credit cards. Such attempts can be tricky and risk annoying customers who don't want to be told which cards they should use.

Kroger Co. Chief Executive Rodney McMullen said the grocery chain is evaluating its options, but it is too early to tell what the removal of the AmEx restriction will mean for its relationships with specific card companies.

"We continue to look for ways to help save on [card] fees so that we can pass those savings to our customers," he said in an interview.

Gas-station owners who get their fuel from Sinclair Oil Corp. typically pay 6.5 cents a gallon when customers use a Visa card to pay for gas at $3 a gallon, but the price goes up by roughly two cents for an AmEx card, says Russell Gibson, manager of marketing technical service for the fuel distributor. He was one of a number of merchants who testified against AmEx at the trial last summer.

While it is up to each gas-station owner to set their own card policy, Mr. Gibson says he will consider alerting them to the change in AmEx rules. "The jury is still out, but the fact is that we now have choices where before we did not," he said.

U.S. District Judge Nicholas Garaufis, who oversaw the AmEx case, laid out specific language that AmEx must use to alert merchants to the rule change. The notification also warns merchants that they aren't permitted to disparage AmEx or mischaracterize its brand.

Merchants also won't be permitted to charge customers more for using an AmEx card, although they can offer a discount for using a card other than Amex.

Annie Gasparro contributed to this article.

Write to Robin Sidel at robin.sidel@wsj.com

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