Every forex price you see on a trading platform has already been passed along a chain of institutions before it reaches you. Unlike stocks, there is no single exchange where all currency trades happen. This article walks through that chain — from the interbank market at the top to the retail trader at the bottom — and explains why it matters for the spreads and execution quality you experience.

Forex has no central marketplace

The foreign exchange market is an over-the-counter (OTC) market: a decentralized network of banks, financial institutions and brokers that trade directly with one another rather than through one central exchange or clearing house. There is no single official exchange rate. Different banks in different centres quote slightly different prices at the same moment, and arbitrage — traders profiting from tiny price differences — keeps those quotes very close together.

That structure has two practical consequences for you. First, the "market price" you see is always a price, not the price: it depends on which broker, liquidity provider and venue is behind your quote. Second, because trading is OTC, your protection depends on the regulation of the specific broker you deal with, not on a central exchange's rulebook.

Tier one: the interbank market

At the top of the market sit the largest international banks and securities dealers, who act as dealers for very large currency trades — often hundreds of millions of dollars in a single transaction. This dealing network is commonly called the interbank market.

Access to this tier is not open. Banks trade with counterparties they have credit relationships with, and the size of a participant's "line" — how much money they can commit per trade — largely determines their level of access. The bigger and more trusted you are, the tighter the pricing you can obtain.

How big is the market?

The Bank for International Settlements (BIS) surveys FX turnover every three years. Its 2025 Triennial Survey, covering April 2025 across 52 jurisdictions, found:

• Average daily turnover of about $9.6 trillion, up 28% from $7.5 trillion in 2022.

• Inter-dealer trading (dealers trading with each other) accounted for about 46% of turnover.

• Dealers' trading with other financial institutions — smaller banks, hedge funds, institutional investors and the like — accounted for about 50%.

• By instrument: FX swaps were the most traded at roughly $4 trillion/day (42%), spot about $3 trillion/day (31%), outright forwards about $1.8 trillion/day (19%), and options about 7%.

• The United Kingdom remained the largest trading centre at 37.8% of turnover, with the United States at 18.6%, Singapore 11.8%, Hong Kong 7.0% and Japan 3.5%.

Two observations follow. Spot trading — the type most relevant to short-term retail traders — is only about a third of the market; the rest is swaps, forwards and options used mostly for hedging and funding. And London's dominance is why a currency's quoted price usually defaults to the London market price.

Where the trades actually happen

Because there is no central exchange, prices form on a patchwork of venues: interdealer electronic broking platforms (historically EBS and Thomson Reuters Dealing), direct bank-to-bank trades, and single-dealer platforms operated by the large banks themselves. These venues compete, and each shows its own order book. No single venue is "the forex market" — they are interconnected marketplaces whose prices stay aligned mainly through arbitrage.

The middle tiers: funds, corporates and smaller banks

Below the top-tier dealers, the market widens. Smaller regional banks — which the BIS counts under "other financial institutions" — were the dominant customer group in 2025, averaging $2.4 trillion per day (about 24% of global turnover). Institutional investors such as pension funds, insurers and asset managers accounted for roughly 13%, and hedge funds and proprietary trading firms about 8%. Large multinational corporations also trade, mainly to hedge cross-border payrolls and currency exposure rather than to speculate.

A useful pattern holds at every step down: as trade sizes shrink and access tiers drop, the spread between bid and ask widens. A dealer who can guarantee large, reliable flow can demand tighter pricing; a smaller participant pays more.

The retail layer: where brokers fit

Retail traders sit at the bottom of this structure and participate indirectly. A retail broker — whether acting as an agency routing your orders to liquidity providers, or as a market maker taking the other side — aggregates prices from its own upstream sources and presents them to you on its platform.

The broker's quote is therefore typically a small markup on the upstream interbank or liquidity-provider price. A simplified, illustrative example shows the mechanism:

• Suppose a liquidity provider quotes EUR/USD at 1.08500 / 1.08502 (a 0.2-pip spread).

• A broker adding 0.5 pip on each side would show you 1.08495 / 1.08507 (a 1.2-pip spread).

• The added distance is the broker's gross revenue from the quote before costs; execution models differ in how much of it is a spread markup versus a separate commission.

(These figures are purely illustrative arithmetic, not observed broker data. Actual markups vary by broker, account type and market conditions.)

What this layer means in practice:

• Two brokers can show slightly different prices at the same second — both are "real", they just come from different upstream sources and markups.

• Spreads widen when upstream liquidity thins — around news releases, at session rollovers, or in thin hours — because the broker's own cost of accessing liquidity widens first.

• Execution quality is part of the total cost. A headline spread means little if fills slip beyond it; comparing typical spreads on your trading hours is more meaningful than comparing minimum advertised spreads.

Why the structure matters for trust

Because forex is OTC, the counterparty you actually deal with is your broker, and the rules that protect you are those of the broker's own regulator — not a central exchange. Understanding the hierarchy helps you ask the right questions: where does this broker get its prices, who are its liquidity providers, how does it execute orders, and what happens to my position if the broker fails? A broker that is transparent about its place in this chain is generally easier to trust than one that markets "interbank access" without explaining the layers in between.

No position in the market hierarchy — retail included — removes trading risk. The structure explains where your price comes from; it does not make any trade safer.