The global credit-card company's entry into digital wallets will tie into its PayPass point-of-sale system, with nearly 500,000 locations around the world where consumers can tap a card or phone with NFC (near-field communications) to make a purchase. But with the new offering, called PayPass Wallet Services, MasterCard will also allow third parties to create payment systems under their own brands.

MasterCard announced the system at an event on Monday evening in New Orleans, the night before the CTIA Wireless trade show begins. In a Tuesday morning keynote speech at the show, the company will also unveil a partnership with Intel to help PC makers build PayPass tap-to-pay hardware into ultrabooks.

To use PayPass Wallet, consumers will sign up and provide information for as many as 25 credit cards, including brands other than MasterCard, plus shipping information. When making an online or mobile purchase, they will be able to choose a card and a shipping destination from among the selections they've entered.

When buying on the Web or a phone, users will tap the PayPass Wallet Services logo and be prompted for a single password. Once that is entered, they will choose a card and shipping site and click to complete the transaction. Using an NFC-equipped phone at an in-store terminal, they will also get that "carousel" of selections, though they will have to choose a card from their list that could be used with the PayPass tap-to-pay system.

What sets MasterCard's offering apart from announced by Visa, Google, PayPal and others is how much the company is opening up its platform to third parties, said Gartner wireless analyst Mark Hung. Banks and other partners will be able to adopt PayPass Wallet Services in two different ways: They can use MasterCard's own service under their own brand or just use the company's API (application programming interface) to build their own platform. The only sign of MasterCard in partners' offerings will be the company logo built into the PayPass Wallet logo.