Chime, the San Francisco-based challenger bank, confirmed that it experienced a brief outage Sunday that left customers unable to complete certain card and mobile transactions. 

Chime customers posted complaints on Twitter and Facebook stating they were unable to make card purchases or withdraw funds from ATMs and also got error messages when trying to get information on transactions.

"Chime experienced a brief outage on Sunday that affected our banking app and select card transactions," Kendra Boccelli, a spokesperson for Chime, told Mobile Payments Today via email. "Member deposits were not affected by the outage. We very quickly resolved the issue with one of our payment processing providers, and members have full access to their accounts as usual."

Customers recently experienced problems logging into their mobile accounts in July. Earlier this month Chime announced that it had grown to 5 million customers, making it the fastest growing challenger bank in the world. The bank reported 3 million customers in March when it announced $200 million in Series D funding.

Chime also launched a service called SpotMe, which provides overdraft protection on debit purchases for customers with direct deposits of at least $500 a month.  

Cover image courtesy of Chime.