Reference

Why your card transaction abroad is more expensive than it looks.

A typical bank-issued card abroad applies the Visa or Mastercard reference rate plus a 2–3% issuer markup. The total round-trip cost is rarely shown on the receipt.

How a card transaction is priced

When you tap your card at a foreign merchant, three rates are involved:

Merchant local price. The amount the merchant charges in local currency.
Network reference rate. Visa or Mastercard publishes a daily reference rate for each pair. This is the rate at which the merchant's currency is converted to your card's billing currency.
Issuer markup. Your card issuer adds a fee on top of the network rate. Typical: 2.5–3%. Premium “travel” cards: 0%.

The receipt shows the local-currency price. Your card statement shows the billing-currency price, which is local-currency × network-rate × (1 + issuer-markup). The markup is rarely itemised.

Network reference rates: Visa vs. Mastercard

Visa and Mastercard each publish a daily reference rate. The two networks usually agree to within 0.1%, but for rare currency pairs they can diverge by 0.3–0.5%. Check both:

Visa: visa.com exchange rate calculator
Mastercard: mastercard.us currency converter

Both networks' reference rates are within 0.5% of mid-market, which is the best retail FX available. The remaining cost is the issuer markup.

Dynamic Currency Conversion (DCC): always decline

// At a foreign POS terminal you may be asked: “Pay in EUR or in your home currency?” The latter is DCC. The terminal converts at a rate set by the acquiring bank, typically 3–7% above the network reference rate. Always decline DCC and pay in the local currency. Your card issuer will then convert at the network rate plus its own markup, which is almost always cheaper than DCC.

Cards with 0% FX markup

A growing number of cards advertise no FX markup on foreign transactions. They convert at the network reference rate with no issuer addition. Examples vary by jurisdiction; check current terms before relying on any specific product:

UK: First Direct, Halifax Clarity, Chase UK debit, Starling, Monzo (subject to fair-use limits).
EU: N26, Revolut Standard (within plan limits), Wise card, bunq.
US: Charles Schwab debit, Capital One Venture, most premium travel rewards cards.

These cards still expose you to the bid-ask spread, but at the network rate the spread is small (typically <0.5%). They are the closest a retail consumer comes to mid-market FX.

How to verify your card's actual rate

Pay a small amount abroad (€10), wait for the transaction to settle, then compare the GBP/USD/etc. amount on your statement to the mid-market rate from this site at the transaction date. The difference is your true round-trip cost. Cards advertising “no FX fee” that show a difference greater than 1% are quietly applying a fee somewhere.