The guys at Balanced are doing a great job. I'm using their service for a product I've built to manage gyms [1] and it is working great. This is cool b/c that wasn't the original intention of how their product would be used (i.e. not a marketplace) but it supports our use case well. Also, the ACH API is one of the BIG differentiators of their product when compared to something like Stripe (which is also very cool, but lacks the processing ACH API).