Ask HN: Best banks for a programmatic ACH interface?

I'm trying to research the best options to do payouts. It seems that currently ACH is most readily available through your bank (assuming they offer it). Both Stripe and Feefighters are planning to offer ACH in the future, but it's unclear when those offerings will become available. Does anyone have any feedback? Maybe some good articles about getting set up with ACH, bonus if it involves marketplace web applications utilizing ACH to make payments to their customers. Maybe ultimately PayPal is a better way to go?