I don't have any financial stake in them, I'm just a pleased patron, but it's this stuff that had me leaping to be an early adopter of Final[0].
Flat out, it's a credit card- but with their site or app you can generate single use numbers and CV2, or you can generate merchant locked numbers for things like Uber. There's a lot more they offer, but those two things are what I got it for and how I use it.