The exchange-rate margin is the difference between the mid-market rate and the rate a provider actually offers a customer. It is usually the largest cost in a currency conversion or international transfer, often larger than the visible fee, which is why quotes are best compared against the mid-market rate.
The margin hides in the rate itself. A provider advertising "zero fees" can still price a transfer expensively by quoting a rate several per cent away from the mid-market figure; the money simply moves from a visible line item into an invisible one. Regulators, including Australia’s competition watchdog, have repeatedly highlighted this as the reason foreign-exchange pricing is hard to compare.
Working the margin out takes one division. Convert the provider’s quoted rate and the live mid-market rate into the same direction, and the percentage gap between them is the margin. On a large transfer, a margin of a few per cent can dwarf any flat fee attached to the transaction.
The ACCC's 2019 foreign currency inquiry published a worked example that shows both operations. On 12 February 2019 a consumer bought US$200 in cash at an airport, against a WM/Reuters benchmark rate, the wholesale mid-market reference, of 0.7072 US dollars to the Australian dollar and an offered rate of 0.6300. Subtract: the gap is 0.0772. Divide it by the benchmark: the margin is 10.9 per cent. Turn both rates the other way up, into Australian dollars per US dollar, and they read 1.4140 and 1.5873, a gap of 0.1733 that is 12.3 per cent of 1.4140. The ACCC's own dollar figures follow the second reading: US$200 that cost the supplier A$283 at the benchmark was sold for A$318, a mark-up of A$35, with A$12 of fees charged on top. One margin, two percentages, and the divisor decides which.
Every corridor page on Tradergy carries the live mid-market rate precisely so that this comparison takes seconds. The site never quotes provider rates and never recommends a provider.
Longer read: Understanding transfer fees and exchange-rate margins. Why a no-fee transfer can cost more than one with a fee, how the margin hides inside the rate, and the one comparison that captures both charges.
The practical companion to this definition is the send-money corridor pages.
Related terms
Mid-market rate · Remittance · Dynamic currency conversion (DCC) · All terms
Primary authority: ACCC. Definition reviewed against the authority’s published material; this page is reference information, not advice.
Common questions
How do I work out the margin on a quote?
Compare the quoted rate with the live mid-market rate for the same pair, in the same direction. The percentage difference between the two is the margin. Adding any flat fee to that margin gives the true total cost of the transfer.
Is a "fee-free" transfer actually free?
Rarely. Providers that charge no explicit fee generally recover their revenue through the exchange-rate margin instead. The only way to see the real cost is to check the offered rate against the mid-market benchmark at that moment.
Is the margin the same for every currency?
No. Providers typically quote tighter margins on high-volume currencies such as the US dollar and euro, and wider ones on less-traded or more restricted currencies. The same provider can be competitive in one corridor and expensive in another.