A reference rate is a published exchange rate for two currencies on a set date. A card statement, a cash desk, a dynamic currency conversion offer and a customs or refund quote can each show a different rate for the same money. Only the reference rate works as a neutral benchmark, and only if you know its date.
The rates you will meet
Five kinds of rate appear on a foreign purchase or refund. Each is set by a different party, for a different purpose.
| Rate | Set by | What to watch |
|---|---|---|
| Reference rate | Published from central-bank and official reference data | A benchmark with an observation date, not a rate anyone is obliged to give you |
| Card network rate | The card network, applied when the transaction posts | Can differ from the reference rate on that day, and your issuer may add a fee |
| Dynamic currency conversion rate | The merchant or ATM provider | Includes the provider's margin, so compare it with a reference rate for the same date |
| Cash exchange rate | The exchange desk | Often a spread between buying and selling, and sometimes a commission, so read the posted terms |
| Customs or refund rate | The customs authority or refund operator | Check the authority's current page or the operator's quote; do not assume it matches the reference rate |
Why BorderBasket shows the observation date
Each currency on this site has its own observation date. Two figures on the same page can therefore come from different days, so check the date next to each one before you compare them. A rate from several days ago is still a useful benchmark for a price comparison, but it is not the rate your card will use today.
Treat the observation date as part of the number. A rate and a price from the same day are comparable. A rate from last week set against a price from today is not, unless you account for the gap. BorderBasket's price figures are dated official-store observations, not live stock or guarantees, and the rates are dated in the same way.
Worked example: a yen price at illustrative rates
Take a 50,000 JPY price. The reference rate in this example is 0.0065 US dollars per yen, an illustrative figure for a single date. The card's rate for the transaction is 0.0066, and the card adds a 3% foreign transaction fee on the converted amount. Those inputs give three different totals.
| At the reference rate | 50,000 × 0.0065 = 325.00 |
|---|---|
| At the card rate, before fee | 50,000 × 0.0066 = 330.00 |
| Card fee at 3% | 330.00 × 0.03 = 9.90 |
| Statement total | 330.00 + 9.90 = 339.90 |
| Gap to the reference rate | 339.90 − 325.00 = 14.90, or 4.6% |
The 14.90 splits into two parts. The card rate sits 5.00 above the reference figure, since 0.0066 is about 1.5% above 0.0065, and the fee adds 9.90. Only the fee depends on your card's fee schedule. The rate depends on the figure applied on the day the transaction posts, which you can read on the statement but cannot predict.
Check the direction of the rate before you multiply. 0.0065 US dollars per yen is the same rate as about 153.8 yen per dollar, because 1 ÷ 0.0065 is 153.8. Multiplying a yen price by yen per dollar gives about 7.7 million for this 50,000 yen price, which is an immediate sign that the direction is wrong. The currency converter uses dated reference rates and lets you add a card fee, so you can set a statement figure against the benchmark.
Which rate answers which question
Use the reference rate to decide whether a price is worth comparing at all. It is the same benchmark for every route, so prices in the same currency from two shops can be lined up on it. Use your card rate and fee to estimate what a card payment will cost, since that is what your statement will show. Use the operator's written quote for a refund, because the operator sets the figure that reaches you.
Mixing these up is a common reason a comparison and the final statement disagree. A reference-rate comparison can look favorable, then the card rate and fee push the real cost above the home price. Once you have a converted figure, the full landed-cost calculator places it beside the home price and the charges that apply to your route.
How to sanity-check a quote
A quote that looks wrong usually is. Run these checks before you accept one:
- Confirm the date of the rate and the date of the price. A quote for today set against a rate from last month is not a like-for-like comparison.
- Confirm the direction. Convert 1,000 yen first: at 0.0065 US dollars per yen it should come to 6.50 before any fee or spread.
- Ask whether the figure includes a fee, a spread or a commission. A quote well above both the reference figure and the card rate plus fee needs a reason.
- For a refund, ask the operator which rate it uses, on which date, and what fee it deducts. The quote should show each step, so you can run the arithmetic yourself.
Customs and refund quotes
Customs authorities and refund operators are not bound to use the reference rate. Where a value or a payout is converted, check the authority's current page or the operator's written quote for the rate it uses. Our explainer on why a tax refund is smaller than the tax covers the other deductions a payout can carry, and the rate is one of them.
Use the reference rate as a benchmark that tells you whether a quote is in a plausible range. Do not treat it as the amount you will be paid. The payout is whatever the operator confirms in writing, after its own rate and fee. For the card side of the same question, see how foreign transaction fees work on purchases and refunds.