I'm not very sure as I haven't really happen to come across a card that let's you pay with crypto directly. Most people make use of exchanges or regular P2p transactions to convert from crypto to fiat to be able to make payment but spending crypto directly from a card isn't something I'm quite familiar with. Anyways most sites these days actually have crypto currencies as payment options and they usually make use of the most popular coins.

If you are Looking to pay for something via a website check to be sure if they accept crypto as a form of payments and if not I think what you will have to do is to convert the amount you wish to pay with from crypto to fiat.