Exchange rate margins explained

The mid-market rate is the midpoint between the highest price a buyer will pay and the lowest price a seller will accept for a currency pair on the global interbank market. It is the rate you see on Google, Reuters or an FX terminal. Nobody transacts exactly at it, but it is the only neutral reference point available.

Every consumer-facing provider prices away from the mid-market rate. The question is not whether there is a margin, but how large it is and whether the provider tells you.

Take the amount your recipient receives, divide by the mid-market rate, and compare that to what you paid. Example: you pay 1,000 USD, the recipient gets 17,000 MXN, and mid-market is 17.42. 17,000 / 17.42 = 975.89 USD of value delivered, so your total cost was 24.11 USD, or 2.41%.

Do this once for each provider you are considering, at the same moment in time, for the same amount. Rate comparisons taken hours apart are meaningless because the underlying market has moved.

Cross-border card transactions carry the same problem in a different wrapper. Dynamic currency conversion at a foreign terminal or website typically costs 3-6% versus letting your issuer convert. The tell is being offered a choice to pay 'in your home currency' — that choice is the markup.

Card issuers may also add a foreign-transaction fee on top of the network conversion rate. Read the card's fee schedule rather than assuming the network rate is what you pay.

There is a business argument for disclosure, not just an ethical one. Customers who discover an undisclosed margin after the fact churn at far higher rates than customers who saw the margin up front and accepted it. Trust compounds; hidden spread does not.

TotalRemit.ai prices from the mid-market rate and shows the margin as a line item on the quote before you confirm. The rate you accept is the rate that settles.