FX markup is a markup or fee added by your bank when converting a transaction from a foreign currency to your card account currency, and it may be in addition to other international fees.
Key points
Therefore, the dollar exchange rate you see in the news is not necessarily the final rate on your statement.
Before you travel, check your card's fee schedule and ask about the conversion rate, markup, and any fees for purchases or withdrawals.
The figures, fees and limits in this answer vary by bank and change over time — confirm them with your bank or the official source before acting.