Currency pair explained: base and quote currency definition
By Ken Chigbo, Founder, KenMacro. Published 2026-05-13.
Quick answer
A currency pair is two currencies quoted together in the foreign exchange market, with the first listed as the base and the second as the quote. The price shows how many units of the quote currency are needed to buy one unit of the base. EUR/USD at 1.0850 means one euro costs 1.0850 US dollars.
What is currency pair?
A currency pair is the standard quotation format in foreign exchange, expressing the relative value of one currency against another. The first currency is the base, the second is the quote or counter currency, and the exchange rate states how many units of the quote currency are required to purchase a single unit of the base. Pairs are grouped into majors, which involve the US dollar against other liquid currencies, minors or crosses, which exclude the dollar, and exotics, which pair a major currency with an emerging market currency. The ISO 4217 three letter codes, such as EUR, USD, JPY and GBP, are used universally across interbank and retail venues.
How traders use currency pair
Retail traders use currency pairs as the unit of execution on platforms such as MT4, MT5 and cTrader, with EUR/USD, GBP/USD, USD/JPY and AUD/USD carrying the deepest liquidity and tightest spreads during the London and New York sessions. The desk monitors pair selection against the macro driver in play: dollar pairs respond to FOMC and US CPI prints, EUR pairs to ECB policy and German data, JPY pairs to BoJ intervention risk and US yield differentials. Position sizing is calculated in the quote currency then converted, and pip values shift accordingly. Institutional desks frequently trade crosses such as EUR/GBP or AUD/NZD to isolate a specific monetary policy divergence without taking dollar exposure, which retail traders can replicate when the macro thesis is currency specific rather than dollar driven.
Worked example of a currency pair quote
Consider GBP/JPY quoted at 195.40. Sterling is the base, the Japanese yen is the quote, and the price states that one British pound is worth 195.40 yen. If the rate rises to 196.40, sterling has strengthened against the yen, or equivalently the yen has weakened against sterling, by 100 pips. A trader holding a long GBP/JPY position profits from this move, while a short position records a loss of the same magnitude. The directional language always references the base currency, so buying GBP/JPY means buying pounds and simultaneously selling yen in equal notional value.
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Frequently asked
What is the difference between the base and quote currency?
The base currency is the first currency listed in the pair and represents the unit being priced. The quote currency, listed second, is the currency used to express that price. In USD/CAD at 1.3650, the US dollar is the base and the Canadian dollar is the quote, meaning one US dollar buys 1.3650 Canadian dollars. All profit and loss calculations originate in the quote currency before being converted to the account denomination.
Why is the US dollar in most major currency pairs?
The US dollar is the global reserve currency and the dominant settlement currency for international trade, commodities and cross border lending. Roughly 88 per cent of all foreign exchange transactions involve the dollar on one side according to BIS triennial surveys. This concentration produces the tightest spreads and deepest liquidity in dollar pairs, which is why EUR/USD, USD/JPY, GBP/USD and USD/CHF are categorised as majors and quoted on every retail and institutional venue.
What are exotic currency pairs?
Exotic currency pairs combine a major currency, usually the US dollar or euro, with the currency of an emerging market economy such as the Turkish lira, South African rand, Mexican peso or Thai baht. Examples include USD/TRY, USD/ZAR and EUR/MXN. Exotics carry wider spreads, lower liquidity outside local trading hours, and higher swap costs. They are more sensitive to political risk and central bank intervention than majors, which makes them less suitable for short term retail strategies.
How are currency pair prices quoted?
Most pairs are quoted to four or five decimal places, with the fourth decimal representing one pip. EUR/USD at 1.08502 has a fifth decimal pip fraction, sometimes called a pipette. Yen pairs are quoted to two or three decimal places because of the yen’s lower nominal value, so USD/JPY at 149.85 has its pip at the second decimal. Brokers display bid and ask prices simultaneously, with the spread being the difference and the trader’s immediate transaction cost.
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