FedACH is the Federal Reserve Banks' Automated Clearing House (ACH) service. In 2007, FedACH processed about 37 million transactions per day with an average aggregate value of about $58 billion. (For comparison, in 2007, Fedwire processed about 537,000 transfers per day valued at nearly $2.7 trillion.)
References
FedACH Wikipedia(Text) CC BY-SA