Why the Exchange Rate You See Online Isn't the Rate You Get
Google shows one exchange rate. Your bank offers you a slightly worse one. Your credit card statement shows a different number again. None of these are wrong, exactly — but only one of them is the rate that institutions actually trade at, and the gap between that number and what you're offered is where a quiet markup lives.
What the "mid-market rate" actually is
The mid-market rate — sometimes called the interbank rate — is the midpoint between the buy and sell prices that banks and large financial institutions trade currencies at with each other, in enormous volume. It's the number you see on Google, XE, or Reuters, and it's the closest thing to a "true" exchange rate at any given moment. It is almost never the rate offered to an individual converting or spending money.
The markup: how the difference quietly adds up
Banks, card networks, and currency exchange kiosks build a margin into the rate they offer you — typically anywhere from well under 1% at the cheapest providers to 3–5% or more at banks, airport kiosks, and some traditional wire transfers. On a $2,000 currency exchange, a 3% markup is $60 that never shows up as a line-item "fee" — it's baked silently into the exchange rate itself.
This is why two providers can both advertise "no conversion fee" and still charge meaningfully different effective costs: the fee was never the primary cost. The rate was.
Dynamic Currency Conversion: the "helpful" prompt that isn't
If you've ever paid with a card abroad and been asked "would you like to pay in US dollars instead?" — that's Dynamic Currency Conversion (DCC). It sounds convenient: a locked-in price in your home currency instead of an unfamiliar one. In practice, DCC almost always applies a worse exchange rate than your card network's own conversion would use. Declining DCC and choosing to pay in the local currency typically gets you closer to the mid-market rate via your card network's own conversion.
When the spread actually matters
For a single coffee abroad, a percentage point of markup is a rounding error. It matters much more in a few specific situations: large one-time transactions like a property purchase or tuition payment, recurring transfers such as being paid in a foreign currency while living abroad, and frequent travel or expat life where the markup compounds across many transactions over a year. In those cases, even a 1–2 percentage point difference in rate can be worth actively shopping for.
How to actually compare providers
The only reliable comparison is: check the actual rate you're being offered against the current mid-market rate for the same currency pair, at the same moment. A provider advertising "0% fees" with a rate 3% off the mid-market number is more expensive than one charging a transparent 1% fee at a rate close to mid-market. Look at the total effective cost — rate spread plus any explicit fee — rather than either number in isolation.
To see today's mid-market rate for a quick conversion, the free Currency Converter gives you a reference point before you accept whatever rate a bank, card, or kiosk offers. If you're specifically sending money abroad rather than just converting for reference, the cost structure is similar but has its own wrinkles — see our breakdown of the real cost of sending money abroad.
