Maybe purse.io can be included there, I know it isn't gift card provider but at some point you can pay with crypto and buy things on amazon, instead of buying dedicated gift card, you buy item and pay with discount. Idk, it's your choice.
Btw I have one question, for example imagine that I want to buy something from sephora and receive that item in America but they don't accept cards from my country (repeat again, for example), so I can't buy item. By purchasing Sephora's gift card, am I capable to buy item that way or still they need some information on my card and billing address? Or gift card and shipping address will complete this task?