Every currency price has two numbers, and the gap between them is where the money is made. This is a plain-English tour of the FX spread — what it is, what it actually costs you in dollars, why your spread is not the same as the next customer’s, and the things a dealer is under no obligation to tell you.
The world’s biggest market has no building, no opening bell, and no closing price on the evening news. Yet the foreign exchange market turns over $9.6 trillion every day and sets the price of every dollar, euro, and yen that crosses a border. Here is how it works — and why it touches your life more often than you think.
The most heavily traded instrument in the world’s biggest financial market is one most people have never heard of. It is not a stock, a bond, or bitcoin. It is not even the spot currency trade we followed in What is Spot? It is the FX swap — roughly $4 trillion changing hands every day, about 42% of all foreign exchange turnover (BIS, April 2025).
The FX market isn’t one pool but a layered hierarchy: a thin wholesale core of tier-1 banks and non-bank market makers sets the reference price, while everyone else reaches it through prime brokers, prime-of-prime providers, and ECNs. Here’s how the layers fit together — and what “last look” really means.
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