According to Fiserv, this agreement will expand the ZashPay network, with the potential to reach more than one billion Visa account holders, and can increase the speed of many payments.

ZashPay currently enables payments to be sent directly to any US bank account in as little as one business day, and real-time payments will be available later in 2011.

Fiserv said initially the service will focus on payment delivery to eligible credit and debit account holders, with plans to expand to prepaid and international account holders in the future.

The service will be available to both consumers and small businesses using ZashPay.

Fiserv division president of digital channels Erich Litch said more than 700 financial institutions have signed up to offer ZashPay, and the service is already live at 500 banks and credit unions.

"Working with Visa allows us to deliver payments to even more consumers, more quickly and deepens the relationship that member financial institutions have with their customers," Litch said.