Smart account

A smart account is a wallet that’s run by code on the blockchain rather than by a single secret key. Because it’s a smart contract, it can enforce rules — spending limits, multiple approvers, recovery options — that an ordinary key-only wallet can’t.

Why it matters: this is the machinery that lets a card be self-custodial without being fragile. A plain wallet is all-or-nothing: lose the one private key and the money is gone. A smart account can add a safety net (a second signer, a recovery method, a daily cap), which is what makes “you hold your own funds” practical for spending rather than just for cold storage. The trade-off is a bit more setup and a little gas to operate it — but in return the card can only move money when you authorise it, and the rules live on-chain where the issuer can’t quietly change them.

For example: both Gnosis Pay and ether.fi Cash give each user a Safe smart account — the same widely-used contract wallet behind a lot of self-custody — as the on-chain wallet the card spends from. Your stablecoins or collateral sit in that Safe, you keep control, and a payment only settles when your account authorises it. That’s the opposite of a custodial card, where the company holds the wallet for you.