An educated Martian, looking at the way planet Earth has organized its payment and settlement systems, would find his fingers or sense pods itching to rip them up and start again. Unfortunately these payment systems are not going to benefit from a Martian invasion anytime soon. There is so much vested interest in keeping large chunks of the status quo that change is slow. The main inertia comes from the banks: the beginning and end of practically every transaction, be it online or offline. They are dragging their feet because of the use they make of the free float between order and settlement, and because changing payment systems is expensive.
So bank customers are faced in this electronic age with money-transfer mechanisms that can take three to four days just to make a retail payment from one high street bank to another. Correspondent banking across national borders is a joke. A money transfer can take more than a week and cost $30. Banking practices in a small country such as Finland show that the technology and security are there to make a retail transfer between banks in real time, triggered by a single person-to-person phone call.
Insecure and inflexible
Visa or MasterCard would tell the Martian that they already have an efficient international multi-currency credit-card payment mechanism with hundreds of millions of customers between them.