How Does the Forex Market Work?
An inside look at how the decentralized, round-the-clock forex market actually sets prices and connects banks, institutions, and retail traders.
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The forex market is the mechanism by which currencies are bought, sold, and priced against each other, nearly 24 hours a day on weekdays, across a decentralized global network rather than through any single exchange. Unlike a stock market, there is no central building or exchange floor where every forex trade takes place. Instead, forex trading happens over-the-counter (OTC) — directly between participants, or through electronic networks that connect them.
No central exchange — so who sets the price?
Because there is no single exchange, prices are set by supply and demand across a web of banks, financial institutions, and trading venues that continuously quote buy and sell prices to each other. The largest commercial and investment banks form what is often called the interbank market, trading enormous volumes directly between themselves and acting as the main source of liquidity for everyone else. Their quotes ripple outward to smaller banks, brokers, and ultimately to individual retail traders, with each layer typically adding a small markup along the way.
When you open a trade with a retail broker, you are not usually trading directly with a bank. Your broker aggregates prices from its own liquidity sources — which might include banks, larger brokers, or other financial institutions — and offers you a price based on them, executing your order either by matching it internally against other clients or passing it through to the wider market.
Why forex trades around the clock
The forex market operates nearly 24 hours a day, five days a week, because it is made up of major financial centers in different time zones that each open and close in sequence: Sydney, Tokyo, London, and New York. As one major session winds down, another is just getting started, which is why forex is often described as a 24-hour market. There is no single opening bell or closing bell the way there is for a stock exchange — trading simply moves from one region to the next as the day progresses. Trading does pause over the weekend, when most financial centers around the world are closed.
What actually moves currency prices
At the most basic level, currency prices move because of changing supply and demand — driven by factors like interest rate decisions from central banks, inflation data, economic growth figures, political events, and shifts in overall market sentiment about risk. Large institutional flows (a central bank adjusting its reserves, a multinational corporation hedging revenue earned overseas) can move prices meaningfully, while retail trading activity, in aggregate, has comparatively little influence on major currency pairs.
Why forex is called the largest financial market
Forex is often described as the largest and most liquid financial market in the world, far bigger by daily trading volume than any single stock exchange. That scale comes from the sheer number and variety of participants involved — not just banks and funds, but import/export businesses converting revenue between currencies, travelers exchanging money, and governments managing their own reserves — all trading continuously across overlapping time zones rather than concentrating activity into a single daily session the way a stock exchange does.
Retail access to the market
Individual traders access this market through a broker, which provides a trading platform, live price quotes, and the infrastructure needed to open and close positions. The broker’s own business model — whether it routes your trades out to external liquidity providers or takes the other side of your trade itself — affects execution quality and is worth understanding before choosing where to open an account. That distinction, along with how different brokers are regulated, is covered in detail elsewhere in this Learn series.
Understanding that forex is a decentralized, continuously quoted market — rather than a single exchange with one official price — explains a lot of what beginners find confusing at first: why the same currency pair can show a very slightly different price at two different brokers at the same moment, why spreads tend to widen around major news events, and why the market never really “closes” the way a stock exchange does, except over the weekend.