When I last worked on a billing system about three years ago, we looked so hard to find an ACH provider. There was just nothing out there. This is an enormous advance.

The problem we had was that we issued moderately large invoices monthly - they could be from $1k to $50k. We wanted to be paid quickly, so we tried to convince our customers to pay by credit card (through Stripe) and enable automatic payments, but we had trouble when customers would bump up against credit card limits.

So, for our bigger clients, we were relegated to asking for checks to be sent by mail. This meant we couldn't automatically charge customers every month, and instead needed to badger them to send their check - all of a sudden, we needed an accounts receivable team. We couldn't just ignore the problem since these were our biggest accounts, too.

Stripe's pricing is almost comically friendly here - credit card transactions are usually in the ballpark of 2.7% + $0.30, so even when card limits weren't an issue, we'd be paying out the nose on the transaction - 2.7% of $10k is $270. The new ACH payments would cost just $5.

Anyways, this is a serious accomplishment. The underlying banking regulations and technologies around ACH are thorny. Good job, Stripe!