Growth in automated clearing house transactions slowed in the second quarter, but the dollar value of those transactions increased slightly.

The number of ACH transactions completed rose 1.5% year over year, to 3.89 billion, according to recent figures from Nacha, the Herndon, Va., electronic payments association. The dollar value rose 7.6%, to $8 trillion.

In the first quarter, transaction volume grew 2.9% while dollar volume increased 5% year over year.

ACH categories that had the biggest growth in transaction volume include the back-office conversion of checks, which rose 26%; consumer-initiated entries, which rose 21.6%; and point of purchase entries, which rose 11.1%.

The biggest transaction declines on the network occurred in the categories of re-presented check entry (27.3%) and accounts receivable entry (6.6%).

The figures do not include "on-us" transactions, or ones in which ACH receiver and initiator are the same bank.