The foreign exchange (FX) market is a global, decentralized network where participants exchange one currency for another and establish their relative prices. It serves businesses, investors, financial institutions, households and public-sector bodies—not just traders speculating on currency movements. Most FX activity takes place over the counter (OTC), while standardized currency futures trade on exchanges.
The main FX transaction types are spot, outright forwards, FX swaps, currency options and currency futures. They differ in when currencies are exchanged, whether the parties must complete the exchange, and where the contract trades.
How the foreign exchange market works
There is no single global FX exchange or central order book through which all currency trades pass. Instead, the market is a network of dealers, customers and electronic venues. Spot transactions and most FX derivatives are OTC: parties can deal bilaterally or arrange trades through platforms, rather than use one centralized marketplace.
Dealers intermediate trades and manage the resulting currency risk. A customer may contact a dealer directly, use a single-dealer system, request quotes from several dealers, or trade through an electronic venue. Some platforms use anonymous central limit order books; voice execution is also available. These overlapping channels make the market decentralized and fragmented.
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The Bank for International Settlements (BIS) reported that, in its April 2025 survey snapshot, 59% of FX trading was executed electronically. Dealers matched more than 80% of customer trades within their own internal liquidity pools. Voice trading remained useful for larger spot transactions and bespoke derivatives. These figures describe that survey period and its definitions, not fixed market constants. BIS analysis of FX trading execution.
What the main types of FX transactions are
People sometimes call spot, forwards, swaps and options different “FX markets.” More precisely, these are transaction or instrument types within the broader currency market. Most trade OTC; futures are a notable standardized, exchange-traded alternative.
| Instrument | When and how currencies are exchanged | Obligation or right | Typical use |
|---|---|---|---|
| Spot | Agreed now, with delivery or cash settlement within the applicable spot convention; the BIS statistical definition uses settlement within two business days. | The agreed exchange is expected to settle. | Currency conversion and near-term payments. |
| Outright forward | The rate is agreed now for exchange on a future date, more than two business days after the transaction under the BIS glossary. | The parties agree to exchange currencies at the contracted rate and date. | Hedging a future currency exposure or taking a position on exchange-rate movements. |
| FX swap | One currency exchange occurs first, followed by a reverse exchange at a later date. | The two exchanges are agreed as part of the arrangement. | Currency funding, liquidity management, hedging or taking a position. |
| Currency option | The contract specifies an exchange rate and a period during which the right may be exercised. | The buyer has a right, not an obligation, to buy or sell one currency against another. | Managing currency risk while retaining a choice about whether to exchange. |
| Currency futures | A standardized contract is traded on an organized exchange. | Contract terms are standardized; these are not the same as privately negotiated OTC forwards. | Exchange-traded currency exposure. |
These definitions follow the BIS OTC derivatives statistics glossary and the BIS’s analysis of FX execution. Spot conventions can vary by currency pair, so two business days is a standard statistical description, not an exception-free rule for every transaction.
Spot: exchange at the prevailing agreed rate
In a spot trade, the parties agree on an exchange rate and exchange the currencies under the pair’s spot settlement convention. It is the usual instrument for a conversion that needs to be settled soon, though the trade date and settlement date are not necessarily the same.
Outright forwards: agree on a future rate
A forward sets the exchange rate today for a currency exchange at a specified future date. A company expecting to receive or pay foreign currency can use a forward to reduce uncertainty about the home-currency value of that future cash flow. A market participant can also use one to take a view on future currency movements.
FX swaps: exchange now and reverse later
An FX swap combines an initial exchange of currencies with an agreed reverse exchange at a later date. This structure can help participants obtain currency funding for a period or manage currency liquidity and risk. In the BIS April 2022 survey, FX swaps were the largest instrument category and accounted for more than half of turnover; that observation applies to that survey, not necessarily to every period. BIS review of the April 2022 FX survey.
Currency options: a right rather than a requirement
A currency option gives its holder the right, but not the obligation, to buy or sell one currency against another at a specified rate during a specified period. That choice distinguishes an option from a forward, in which the parties agree to make the exchange on the contract terms.
Currency futures: standardized and exchange-traded
Currency futures are standardized contracts traded on organized exchanges. That makes their trading channel different from the predominantly OTC spot and derivatives market. Futures are one part of FX activity, not a substitute for the whole global market.
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Participants include banks and other dealers, hedge funds, principal trading firms, institutional investors, non-financial companies, households and official-sector financial institutions. The latter category includes central banks, sovereign wealth funds, international financial institutions, development banks and agencies in BIS classifications.
- Businesses exchange currency to pay suppliers, receive overseas revenue, invest across borders or hedge future receipts and expenses.
- Financial institutions and investors may convert currencies, fund positions, hedge exposures or seek investment returns.
- Dealers and non-bank liquidity providers facilitate trading and manage the risks associated with providing prices and liquidity.
- Households may need currency for travel, remittances, overseas purchases or other cross-border payments.
- Public-sector institutions may transact for reserve management, public financing or other official purposes.
FX therefore supports commerce and finance as well as trading activity. BIS research describes the market as serving different needs, including conversion, hedging, funding and investment. BIS Working Paper 1094.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How large the FX market is
Average daily OTC FX spot and derivatives turnover was $9.5 trillion in April 2025, according to the BIS. That survey result was 27% higher than the April 2022 figure of $7.5 trillion. The BIS associated the increase with heightened volatility following US tariff announcements and increased trading with financial customers. These are gross average daily turnover figures for the specified survey months—not the amount invested, the market’s net value, or a guaranteed reading for any other day. BIS overview of the 2025 FX survey.
The comparison also illustrates why a turnover statistic needs a date: April 2022 and April 2025 are separate survey snapshots, and activity changes over time. The $7.5 trillion figure is useful as historical context rather than as a current daily estimate.
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What the market structure means for participants
Because much FX trading is OTC and spread across dealers and venues, the price and execution a customer sees can depend on the instrument, trade size, counterparty and channel. The market’s electronic share does not mean every trade happens on one public platform: dealers’ internal liquidity pools and voice transactions remain part of the structure.
FX oversight also differs by jurisdiction and product. The BIS working paper notes that regulatory oversight is lighter than in equity and bond markets in most countries; this should not be read as saying that FX is unregulated everywhere. Applicable requirements depend on where a participant trades and what product is involved. BIS Working Paper 1094.
Quick Recap
A concise way to distinguish the terms
- Spot means an exchange under the currency pair’s near-term settlement convention.
- Forward means an exchange rate agreed now for exchange at a future date.
- Swap means an initial currency exchange paired with a later reverse exchange.
- Option means a right to exchange at specified terms, without an obligation to do so.
- Future means a standardized currency contract traded on an organized exchange.
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