Thanks, @prbuckley, it was a painful two years of working very closely with one of the largest processors in the US, FIS, their core banking software actually powers thousands of banks, so we essentially, built a virtualization layer on top of their older systems. We intend to open these APIs down the road for others to build upon...stay tuned :) (I am a founder here)
We've been experimenting with a service that allows us to issue virtual fixed-limit cards. In other words, when we setup the card we deposit a certain amount into that card. Those funds are taken out of our bank account.
Once that money is used-up the card is no-longer usable and a new one has to be issued. This is a pain.
We've been looking for a solution that would allow us to create and issue virtual check cards linked to a central bank account. In this scenario the cards would still have spending limits but can be refreshed/renewed as needed. An API would be fantastic.