Multi-currency accounts move the spread rather than remove it

Multi-currency accounts and travel cards are sold as a way to avoid exchange costs. They compress those costs considerably, but the conversion still has to be paid for by someone.

Holding a balance is not the same as converting one

These accounts let a user hold several currencies at once. Spending from a balance already held in the local currency involves no conversion at the point of sale.

The conversion happened earlier, when the balance was funded. That is the transaction where the rate and the fee applied, whatever the app displayed at the moment of payment.

Spending in a currency not held triggers a conversion at the time of the transaction, which is a different and usually less favourable event than a planned exchange.

The advertised rate is a mid-market rate plus a fee

Most of these providers quote the interbank mid-market rate, which sits between the buy and sell prices, and then charge an explicit percentage or flat fee on top.

This is genuinely cheaper than a wide retail spread, because the cost is separated and visible rather than hidden inside the rate. It is not the same as free.

Fee structures also tier: a monthly allowance converted at one rate, and everything beyond it at a higher one. Heavy use crosses into the more expensive band without announcement.

Markets close and pricing widens

Currency markets are thin or closed at weekends and on public holidays. Providers protect themselves by widening their pricing or adding a surcharge during those periods.

Funding an account on a Friday afternoon rather than a Saturday night is therefore a real difference in cost, for reasons that have nothing to do with the traveller.

The same applies to thinly traded currencies at any time of week, where the provider is buying in a shallow market and prices that risk into the rate it offers.

The card network is a separate layer

Even with a local balance, a merchant terminal may offer to charge in the cardholder's home currency. Accepting that hands conversion back to the merchant's provider at their rate.

Declining and paying in the local currency keeps the conversion inside the account, which is the whole reason for holding it. The choice appears on the terminal, not in the app.

Failure modes worth planning for

These accounts are usually app-based, which ties access to a phone and a data connection. A lost phone abroad can suspend access at the moment it is most needed.

Some are electronic money institutions rather than banks, so deposit guarantees may differ. Keeping the travel balance small and the main balance elsewhere limits the exposure without losing the benefit.