The Isis Mobile Wallet is expected to roll out nationwide later this year, but without the support of one of its initial credit card partners.
Capital One confirmed to PCMag that it plans to end its pilot test with the NFC venture, claiming it has gathered enough insight, but will "continue to work with Isis to evaluate options for a continued presence in the Isis Mobile Wallet."
Droid Life also published an email that Capital One sent to customers, which warned them that the pilot test would end this month. The bank promised that users' account information and terms will remain unchanged, and that this move will not impact other cards stored in the digital wallet.
"We are so grateful to have customers like you who are eager to test the latest technology and provide feedback on cool new mobile solutions," the email said. "We are incredibly thankful for your participation in the pilot."
The program also includes American Express, Chase, and Barclaycard. Still, Capital One's move to ditch Isis is making some nervous about the future of the project, which must contend with rivals like Google Wallet and PayPal Here.
"While Capital One cards are not currently available, we continue to work with Capital One in order to define the future of mobile payments," an Isis spokesman said via email.
Isis — a joint venture between AT&T, Verizon, and T-Mobile — launched in Austin and Salt Lake City last fall, following a series of delays. Using NFC technology, consumers and merchants can transfer money, make payments, or offer discounts and loyalty perks.
In July 2011, the commerce venture revealed early relationships with the top four U.S. payment networks: Visa, MasterCard, American Express, and Discover.
There is no word on when the system will launch nationwide; the Android-only service is also expected to reach the iOS, Windows Phone 8, and BlackBerry 10 platforms by the end of the year.
Check out the Isis Mobile Wallet in action in the video below.
Editor's Note: This story was updated at 12:15 p.m. Eastern with comment from Capital One.