https://en.wikipedia.org/wiki/ACH_Network

In the United States, the ACH Network is the national automated clearing house (ACH) for electronic funds transfers established in the 1960s and 1970s. It is a financial utility owned by US banks, and is one of the largest payments networks in the United States, both by volume and by customer reach; virtually every bank account in the US, whether personal or commercial, is connected to the network.