How our exchange rates work

Rates come from the Frankfurter blended daily feed, built from central-bank and official-source observations. They are reference mid-market values, not a bank offer. We store observations locally and refresh them on a schedule. A cross-rate divides the two USD-based observations from the same published date. We use the latest common date, which can be older than either currency’s latest individual observation. Weekends, publication schedules and gaps can affect dates. No forward-looking values are invented. Bank fees, card conversion fees, cash spreads and local alternative-market rates are not included. Some currencies have official or restricted rates that may differ substantially from prices available to you.

Cross-rate formula

If one USD represents A units of the first currency and B units of the second, the cross-rate is B ÷ A. Both observations must share the same date.

We retain up to five years of source observations where available. A newer currency or a gap in coverage can result in a shorter history. A peg-based rate is a reference calculation, not proof that funds can be exchanged at that rate.

Frankfurter documentation