If you have a crypto wallet with a card, you have two balances, and confusing them is the usual reason a payment fails. Here is what each one holds, how money moves between them and what that costs.
Published September 30, 2026 · 2 min read
The wallet balance is your crypto held in the account: USDT, USDC, BTC and ETH. It grows when a deposit is credited after the network confirms it, and it can be rearranged by swapping coins inside the wallet, which costs 0% at the rate with no markup. In Nexus Pay this is the main store of value, the place where funds arrive first. It is not what a shop terminal or an ATM sees when you pay by card.
The card balance is the money you have moved onto the card from the wallet balance. Every card payment or ATM withdrawal draws on this amount and nothing else. The card only spends the available balance, with no credit and no overdraft. That is why a full wallet does not help at the till if the card itself has not been topped up.
The table sets the two side by side. The main point is that the wallet is where funds are held and the card is where they are spent. Money passes from one to the other in a single direction that you trigger yourself, wallet to card.
| Aspect | Wallet balance | Card balance |
|---|---|---|
| What it holds | Crypto: USDT, USDC, BTC, ETH | Money moved over from the wallet |
| Main purpose | Holding and swapping coins | Paying in shops and withdrawing cash at ATMs |
| How it is funded | Deposits over the supported networks | Transfer from the wallet balance at 0.1% |
| Can it pay at a till or ATM | No, the card does not draw on it directly | Yes, this is what a payment or withdrawal uses |
| If it runs out | Deposit more crypto | Payments are declined until you top up from the wallet |
The card is designed to spend only money that has been moved onto it, at a 0.1% transfer fee. This keeps the two roles separate: the wallet holds your crypto, and the card holds a spending amount you chose. It also limits exposure. If you freeze the card in the app, which takes one tap, what is on the card is the amount you decided to put there, not your entire holdings. The card can also be unfrozen in one tap.
Moving money from the wallet balance to the card costs 0.1%. The fee page gives an example: 1000 USDT moved to the card becomes $999.00. Paying in shops adds 0%, while an ATM withdrawal costs 0.25%, so the same 1000 USDT withdrawn at an ATM leaves $996.50 before any fee from the ATM owner. The ATM fee is charged per withdrawal, so one larger withdrawal costs less than several small ones for the same total.
A common approach is to keep most of the value in the wallet and move onto the card only what you plan to spend. Some practical ways to apply it:
Each top-up carries the 0.1% fee, so it is worth balancing convenience against the number of transfers. This is general information, not financial advice.
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