
One works from an exchange with nothing installed. The other is a single signature in Phantom. Neither asks you to make an account, and both cost the card's face value and nothing more.
Nothing to install, connect or sign — this works straight from a centralised exchange. You get an address used once, belonging only to your order, which is how the payment is matched to you without our knowing anything about you.
For SOL, USDC, $Spend and 47 tokenized stocks. One signature does the sale and the payment together, so there is never a moment where you have paid and hold nothing.
Before your wallet is ever asked to sign, the browser reads the transaction itself: exactly one transfer, the exact amount quoted, the exact destination, no unknown programs and no token approvals. Anything else is refused before the popup opens.
Read the docs