How Does the Forex Market Work?
The forex market works as a decentralized, over-the-counter network where currencies are bought and sold between banks, institutions, brokers and individual traders — with no single central exchange. Prices are set continuously by supply and demand across overlapping global trading sessions, allowing the market to run almost 24 hours a day, five days a week.
Key Takeaways
- Forex has no central exchange; trading happens electronically across a global network of participants.
- The market runs continuously through four overlapping sessions: Sydney, Tokyo, London and New York.
- Prices are driven by supply, demand, interest rates, economic data and market sentiment.
- Retail traders access the market through a regulated broker, who in turn connects to liquidity providers.
- Liquidity and spreads vary throughout the day depending on which sessions are active.
The Structure of the Forex Market
Unlike stock markets, which trade on centralized exchanges like the NYSE or LSE, forex is an over-the-counter (OTC) market. This means trading happens directly between parties via electronic networks rather than through a single exchange. The market has a loose hierarchy:
- Interbank market — the largest banks in the world trade directly with each other and set the benchmark rates for major currency pairs.
- Liquidity providers — large banks and financial institutions that supply the buy/sell prices brokers use to fill client orders. See liquidity provider.
- Brokers — connect retail and institutional clients to liquidity providers, either passing trades through directly (a “no dealing desk” model) or, in some cases, taking the other side themselves.
- Retail traders — individuals trading through a broker’s platform, typically using MetaTrader 4 or MetaTrader 5.
This layered structure explains why the price you see on your platform is a composite of quotes from multiple sources rather than a single “official” market price.
Why Forex Trades Almost 24 Hours a Day
The forex market is organized around four major financial centers, each with its own trading session:
| Session | Approx. Hours (UTC) | Notes |
|---|---|---|
| Sydney | 21:00–06:00 | Market opens for the trading week |
| Tokyo | 23:00–08:00 | Asian session, active JPY pairs |
| London | 07:00–16:00 | Highest overall trading volume |
| New York | 12:00–21:00 | Overlaps with London for peak liquidity |
Because these sessions overlap — most notably London and New York — there’s rarely a moment during the trading week when no major center is active. The market typically opens Sunday evening (UTC) and runs continuously until Friday evening, then pauses over the weekend. For a full breakdown of session timing and which pairs move most in each window, see our education section on trading timeframes.
How Exchange Rates Are Determined
Currency prices move based on the balance of supply and demand, which in turn is influenced by:
- Interest rate decisions from central banks, since higher rates tend to attract foreign capital seeking better returns. See how interest rates move currencies.
- Economic data releases, such as GDP, employment figures and inflation reports (see what is CPI inflation).
- Geopolitical events and risk sentiment, which can drive flows into or out of safe-haven currencies.
- Market speculation, as traders and institutions position themselves ahead of anticipated events.
There’s no single entity that “sets” the exchange rate; instead, it emerges continuously from the aggregated buy and sell orders flowing through the market at any given moment.
Bid, Ask and the Spread
Every currency pair is quoted with two prices: the bid price (what you can sell at) and the ask price (what you can buy at). The difference between them is the spread, which represents one of the main costs of trading forex. For example, if EUR/USD is quoted at 1.0848/1.0850, the spread is 2 pips. For a full walkthrough of quotes, see How to Read a Forex Quote.
How Retail Traders Fit Into the Market
Retail traders make up a relatively small portion of total forex trading volume compared to banks and institutions, but the growth of online brokers has made the market highly accessible. To participate, you typically need:
- An account with a regulated broker.
- A trading platform, most commonly MetaTrader 4 or 5.
- An understanding of leverage and margin, since most retail forex trading uses margin accounts.
Different brokers use different execution models — some offer ECN or STP execution that routes orders directly to liquidity providers, while market maker brokers may take the other side of client trades internally. Our guide on ECN vs. market maker brokers explains the practical differences. Reviews of brokers such as IG, Pepperstone, IC Markets and XM detail each provider’s execution model and regulation.
Liquidity and Volatility Throughout the Day
Liquidity isn’t constant throughout the trading day. During the London-New York overlap, spreads on major pairs like EUR/USD or GBP/USD tend to be at their tightest because so many participants are active simultaneously. In contrast, during the gap between the New York close and Sydney/Tokyo open, liquidity can thin out, sometimes leading to wider spreads and choppier price action — a period often referred to informally as the “dead zone.”
Traders who rely on tight spreads and fast execution, such as scalpers, often concentrate their activity during the busiest overlap hours, while swing traders may care less about intraday liquidity fluctuations.
Why Understanding Market Structure Matters
Knowing how the forex market actually works helps explain practical realities every trader encounters — why spreads widen around major news releases, why some currency pairs are more liquid than others, and why execution speed matters more for some strategies than others. Before placing your first trade, it’s worth pairing this knowledge with our guides on what is forex trading and risk management in trading, since understanding the market’s mechanics is only half the picture — protecting your capital while trading in it is the other half.
Forex trading involves substantial risk, particularly when using leverage, and is not suitable for everyone. Always trade with capital you can afford to lose and consider practicing on a demo account before committing real funds.
Frequently asked questions
- Why does the forex market trade 24 hours a day?
- The forex market operates through overlapping trading sessions in Sydney, Tokyo, London and New York. As one financial center closes, another is opening or already active, allowing continuous trading from Sunday evening through Friday evening (in most time zones).
- Who sets forex exchange rates?
- There's no single price-setter. Exchange rates emerge from the collective buying and selling activity of banks, liquidity providers, institutions and retail traders, all competing to quote and trade at the best available price.
- Is the forex market regulated?
- There's no single global forex regulator since it's a decentralized, over-the-counter market. However, the brokers who provide retail access are regulated by national authorities such as the FCA, ASIC, and CySEC, which set rules for client fund protection and conduct.
- What is the most liquid time to trade forex?
- The overlap between the London and New York sessions, roughly early-to-mid afternoon UK time, typically sees the highest trading volume and tightest spreads for major currency pairs.