FX and Top-Up Fees Explained: Where Crypto Card Costs Hide

Crypto card fees rarely appear as a single number. A purchase can pass through several conversions, each with its own cost. Once you know where the layers are, you can compare cards on what you actually pay rather than on the headline offer.

What an FX fee is

An FX fee, or foreign exchange fee, is charged when you pay in a currency different from your card’s base currency. If your balance is in euros and you buy something priced in US dollars, the provider converts the amount and may add a percentage on top.

Some cards waive FX fees up to a monthly limit, then charge above it. Others waive them only on certain plans. The fee schedule will say which.

Spread versus explicit fee

There are two ways a provider can charge for conversion:

• Explicit fee. A visible percentage or flat charge listed separately. Easy to spot.
• Spread. A margin built into the exchange rate itself. You see only the final rate, so the cost is hidden unless you compare it with the mid-market rate.

A card can advertise “no fees” while still earning a spread. That is not necessarily dishonest, but it means you need to check the rate, not just the fee list.

The layers on a crypto card

1. Top-up fee. Charged when you load funds, especially by debit or credit card.
2. Crypto to fiat conversion. When the provider sells your crypto, either at top-up or at payment time, it may apply a spread.
3. FX fee. Applied if the purchase currency differs from your balance currency.
4. ATM fees. Withdrawals can carry a provider fee, a fee from the ATM operator and an FX charge, all at once. Many cards include a free monthly allowance, then charge above it.
5. Other fees. Card issuance, delivery, monthly plans or inactivity charges.

A worked example

Here is a purely hypothetical example with round numbers. It does not describe any real card.

You hold crypto and want to buy something priced at $500 while your card is set to euros. The card charges a 1% top-up fee, a 1% spread when converting crypto to euros and a 2% FX fee on foreign currency payments.

• Top-up: you load the equivalent of $500, paying about $5 in top-up fees.
• Conversion spread: roughly another $5 is lost in the crypto to euro rate.
• FX fee: about $10 on the dollar purchase.

You can model your own spending and rewards with our cashback calculator.

How to read a fee schedule

• Find the official fee page or terms, not a summary in an advert.
• Note which fees are percentages and which are flat amounts; flat fees hurt small transactions most.
• Look for monthly allowances and what happens once you exceed them.
• Check whether fees differ by plan, region or funding method.
• Test with a small purchase and compare the rate you got with the mid-market rate.

Travelling soon? Our guide on avoiding FX fees abroad covers practical habits, such as declining merchant currency conversion.

Frequently asked questions