When it comes to radically altering the fabric of digital payments, there is no startup more interesting than Dwolla. The Iowa-based company has built its own alternative to the credit card networks and Automated Clearing House (ACH), the decades-old infrastructure which powers everything from bank transfers to cutting-edge payment companies like Square. First, it can avoid the hefty interchange fees levied by the credit card companies. The problem with that is, as soon as people need to move their money back into the old system for any reason, you’re in big trouble, because all the same fees and wait times will apply. Users need to be able to pay merchants and transfer money to friends without ever leaving the Dwolla system.