Ask HN: Virtual credit cards with access rules?

I've been wondering recently about the possibility of an abstraction layer above credit cards where numbers can be created and controlled by the user in a certain way. I'm aware of EntroPay who offer prepaid virtual cards.

Is anyone offering a master card with full access to my account, but allowing users to spin up virtual cards that work in different ways? e.g., I could create one which only works with a wildcard match of "amazon" on the transactor field. Or a virtual card which is capped at $300/month (retainer for an employee) or one which has a maximum of $100 (gift card for a friend). Or only works in a particular country or currency. And can all be shut down whenever required.

Would this even be possible with the way credit cards are currently set up?