You mean have a debit card that you top up and then tap to pay with x402?
Right now you can have onramp for up to $500 a week without KYC (apply pay, credit card only US). You need a UI for this though no backend handling right now.
There’s some inspiring projects that combine cards and stablecoins and x402 like
@AbhinavBuilds work or this one that came out recently
Terminal introduces the first native stablecoin tap to pay: with Burner you don't need to fight with QR codes or apps, simply tap the same way you would with a traditional credit card.