Understanding Currency Pairs: Majors, Minors and Exotics

Foreign exchange is the only market in which you never buy or sell a single asset. Every transaction is a relationship: you buy one currency and, at the same moment, sell another. That relationship is expressed as a currency pair, and understanding how pairs are built, quoted and grouped is the first step towards reading the world's largest financial market with confidence.

How a currency pair is quoted

Each currency is identified by a three-letter ISO 4217 code — USD for the US dollar, EUR for the euro, JPY for the Japanese yen, GBP for the British pound. A pair places two of these codes side by side, such as EUR/USD. The first code is the base currency and the second is the quote (or counter) currency. The price tells you how many units of the quote currency are needed to buy one unit of the base currency.

If EUR/USD is quoted at 1.1500 (illustrative), one euro costs 1.15 US dollars. Buying the pair means buying euros and selling dollars; you benefit if the euro strengthens relative to the dollar. Selling the pair is the reverse position. Because every trade is relative, a rising pair can reflect strength in the base currency, weakness in the quote currency, or both.

Bid, ask and the spread

Every quote has two sides. The bid is the price at which the market will buy the base currency from you; the ask (or offer) is the price at which it will sell it to you. The difference is the spread, the most visible cost of trading. Spreads are measured in pips — for most pairs the fourth decimal place (0.0001), and for yen pairs the second decimal place (0.01). Liquid pairs in active hours typically carry the tightest spreads; thinly traded pairs, or any pair during quiet periods and major news, can see spreads widen considerably.

The three families of currency pairs

Market participants group pairs by liquidity and by whether the US dollar is involved. The US dollar sits on one side of almost nine in ten FX transactions, according to the Bank for International Settlements (BIS) Triennial Survey, which also measured global turnover at US$9.6 trillion per day in April 2025. That dominance shapes the whole structure of the market.

The majors

EUR/USD is the most actively traded pair in the world, reflecting the size of the two economies it connects. USD/JPY is heavily influenced by the interest-rate gap between the United States and Japan; GBP/USD — known as "cable", after the transatlantic telegraph cable once used to transmit its price — responds strongly to UK data and Bank of England policy. USD/CAD, AUD/USD and NZD/USD are often described as "commodity currencies" because the underlying economies are significant exporters of energy, metals or agricultural products. USD/CHF involves the Swiss franc, historically regarded as a defensive currency in periods of stress.

The minors

Crosses allow a view on two economies without taking a direct position in the dollar. A trader who expects the euro area to outperform the United Kingdom, for example, can express that idea precisely through EUR/GBP. Crosses are liquid, but because their prices are frequently derived from two dollar pairs, their spreads tend to be slightly wider than those of the majors.

The exotics

Exotic pairs can move sharply on domestic politics, capital controls, sovereign credit events or central bank intervention. Their interest-rate differentials are often large, which affects the cost or credit of holding positions overnight. Liquidity can thin dramatically outside local trading hours. Exotics are not inherently "better" or "worse" than majors — but they demand smaller position sizes, wider risk tolerances and a clear understanding of the local macro story.

What moves a currency pair?

Because a pair is a ratio, its direction depends on the relative outlook for two economies. The most important drivers are:

• Interest-rate differentials — capital tends to flow towards currencies offering higher real returns, and expectations for central bank policy often matter more than the current rate.
• Economic data — inflation, employment, GDP, purchasing managers' indices and retail sales shape those policy expectations.
• Risk sentiment — in periods of stress, investors have historically favoured the US dollar, Japanese yen and Swiss franc; in calmer periods, higher-yielding and commodity-linked currencies often attract flows.
• Trade and capital flows — persistent current-account surpluses or deficits, and large cross-border investment flows, influence longer-term trends.
• Geopolitics and policy surprises — elections, sanctions, tariffs and unexpected central bank actions can reprice a pair in seconds.

A currency pair is not a single price. It is a running verdict on two economies, two central banks and the flows between them.

Choosing which pairs to follow

Professional desks rarely spread attention across dozens of pairs. They concentrate on a focused list where they understand the drivers, know the typical daily range and can monitor the relevant economic calendar. For most participants, a sensible starting point is two or three majors, studied across different sessions and volatility regimes, before adding crosses or exotics. Whatever the selection, position size should always be adjusted for each pair's volatility — a move that is routine in GBP/JPY might be exceptional in EUR/CHF.

Currency pairs are the vocabulary of the FX market. Once the structure is clear — base against quote, majors against crosses and exotics, relative outlooks rather than absolute ones — every chart, headline and data release becomes easier to interpret. Trading them, however, involves leverage and a real risk of loss, and should only be undertaken with a disciplined, well-understood risk framework.

This article is published by OT PMC Research for general education and information only. It does not constitute investment advice, a recommendation or an offer to buy or sell any financial instrument, and it does not take account of your objectives, financial situation or needs. Figures labelled "illustrative" or "example" are hypothetical.