The trouble is that you either need cryptocurrency or you need some prearranged entity that both parties trust. With current credit cards, that prearranged enti

The trouble is that you either need cryptocurrency or you need some prearranged entity that both parties trust. With current credit cards, that prearranged entity is Visa/MC/Amex/Discover. I don't see cryptocurrency being practical for this use, or ever widely accepted even if somehow practical. Maybe the new FedNow could serve as that foundation with card processing built on top. But then you have issues like, what about disputes and fraud? With existing credit cards, buyer and seller have both agreed in advance to abide by certain rules. With an open standard, I as a buyer could stand up my own service that makes the payment and then retracts it, or if FedNow doesn't allow retracting payments then I as a seller could make one that refuses to refund the money and I can just not give the buyer their item. (And yeah, this is already illegal, but we see plenty of nefarious activity like this online anyway.)