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A market with no exchange

Lesson 1 · about 8 min

If you came from Trading 101, you learned about markets with an exchange in the middle: one order book, one official last price, one tape everyone can read. The currency market has none of that. Understanding why is the difference between a beginner who is confused by their broker's quotes and one who knows exactly what they are looking at.

Over the counter

Foreign exchange (FX, forex) is an over-the-counter (OTC) market. There is no building, no matching engine and no single order book. Instead there is a network of banks, non-bank market makers, funds, corporations and brokers, each dealing directly with a handful of counterparties.

When a bank sells euros to another bank, that trade is a private contract between the two of them. Nobody is required to publish it. The Bank for International Settlements estimated turnover at roughly $7.5 trillion per day in its 2022 survey, which makes FX the largest financial market on Earth, and almost none of that volume is visible to you in real time.

Feature Exchange-traded (stocks, futures) FX spot (OTC)
Where trades match Central exchange Bilaterally, between counterparties
Official last price Yes, on the tape No; each venue has its own
Volume data Public and complete Partial, venue-specific, mostly private
Counterparty Clearing house The dealer or broker you trade with
Trading hours Exchange session Continuous, Sunday evening to Friday evening

What "the price" means in FX

Because there is no central tape, there is no single EUR/USD price. At any instant, dozens of dealers are quoting slightly different bids and asks. When a chart shows 1.0850, that is one venue's quote, or an aggregate of a few venues, at that moment. Another broker's chart may show 1.0851 or 1.0849 for the same second.

This is normal, not a scam. Two things follow from it:

  1. Your broker's quote is the only one that fills your order. A price you see on a news site or a different platform is information, not a tradeable level.
  2. "Volume" on an FX chart is tick volume, the number of price changes in the bar, not the number of units traded. It is a rough proxy for activity, nothing more.

Key idea: In FX there is no such thing as "the" price, only the price your particular counterparty is willing to deal at right now. Every quote you see is somebody's offer, not a public record.

Spot, forwards and what retail traders actually trade

Professionals trade several FX products:

  • Spot. An agreement to exchange two currencies at today's rate, settling two business days later (T+2). This is the reference price everything else hangs off.
  • Forwards and swaps. Agreements to exchange at a future date, priced off spot plus the interest rate difference. Most of the $7.5 trillion is here.
  • Currency futures. Exchange-listed contracts (for example on the CME) with a central tape. A minority of volume, but transparent.

Retail traders almost never take delivery of currency. What you trade with a retail FX broker is typically a rolling spot contract or a contract for difference (CFD) that mirrors the spot rate. The position is rolled forward every day at 5pm New York time (Module 3 covers this), and the interest difference is charged or paid as a "swap." You never own euros; you own a contract with your broker whose value moves with the euro.

That last sentence matters. In stocks, your broker holds shares for you at a custodian. In retail FX, your broker is usually your counterparty. The next three lessons deal with what that means.

Why it is still tradeable

None of this makes FX unfair. It makes it a dealer market, the same structure as corporate bonds or physical commodities. Dealers compete on price, and because the major pairs are so liquid, competition keeps quotes tight: a good broker's EUR/USD spread in the London session is often under one pip, which is a fraction of a hundredth of a percent.

What you give up is transparency. What you get is a market that is open almost 24 hours, five days a week, in sizes from a thousand units up.

Try it: Open two free charting platforms (or your broker's platform and a public charting site) side by side on EUR/USD on a one-minute chart. Note the quote on each at the same second. They will usually differ by a fraction of a pip. That gap is the OTC structure made visible.

Recap

  • FX is over the counter: trades are private contracts between counterparties, not matched on a central exchange.
  • There is no official last price or public tape; every chart shows one venue's quote.
  • Retail traders trade rolling spot contracts or CFDs with a broker, not actual currency.
  • Chart "volume" in FX is tick count, not units traded.
  • Dealer competition keeps major-pair spreads tight, but the quote that matters is the one your own broker shows.

See it drawn

Original diagrams for the ideas on this page. Illustrative, not real market data.

Bid-ask spread in an order bookSell orders stacked above buy orders with a gap between the best of each.SELLERS (asks)50.0690050.051,40050.0460050.011,10050.002,30049.99800spread = 0.03BUYERS (bids)
The bid-ask spread. Buy orders sit below, sell orders above, and the gap between the best bid (50.01) and best ask (50.04) is the spread you pay to cross. Bar length shows the size resting at each price.
How a position size is worked outAccount size, risk per trade and stop distance feed into one box giving the number of shares.ACCOUNT SIZE$25,000your capitalRISK PER TRADE1%of the accountSTOP DISTANCE$0.50entry to stopPOSITION SIZE500 sharesrisk budget: $25,000 × 1% = $250position size: $250 ÷ $0.50 = 500 shares
Working out a position size. Three numbers decide how big a trade is: the account, the share of it put at risk, and the distance from entry to stop. One percent of $25,000 is a $250 budget, and a $0.50 stop divides into that 500 times.