Dwolla doesn't have to convince them, they are essentially plugging into the ACH - which all banks subscribe (connect/transact to). The notion is that Dwolla is the online equivalent of an electronic cheque being processed.
How can Dwolla persuade banks when banks earn more revenue from debit card transactions?
How can ACH be used to move money between a customer’s own checking and savings or investment accounts?1 ansIs there a way to let users transfer money to each other directly from their bank accounts inside my app?1 ansHow does an app enable transfers between two different bank accounts?1 ansWhich company or API can assist with enabling ACH deposits into mutual funds?1 ans