Yes. They only do bank to bank. But there is definitely a business model here.

If you can offer subscription model and can do bank to bank transfer with 0.5% fees, you will disrupt the whole subscription industry relying on visa/Master card monopoly. Not only this, banks also charge very high currency conversion fees which you can disrupt.

You of course need to build lot of things from scratch but with most of the banking now a days going online with new APIs, it is possible.