Currency Pairs Explained

Understanding Currency Pairs

In the forex market, currencies are never traded in isolation — they are always quoted and traded as pairs. A currency pair consists of two currencies: the base currency (listed first) and the quote currency (listed second), separated by a forward slash. The base currency is the one you are buying or selling, and the quote currency tells you how much it costs.

For example, in the pair EUR/USD, the euro (EUR) is the base currency and the US dollar (USD) is the quote currency. If EUR/USD is priced at 1.0900, it means one euro is worth 1.0900 US dollars. When you "buy EUR/USD," you are buying euros and simultaneously selling dollars. When you "sell EUR/USD," you are selling euros and buying dollars.

The convention for which currency comes first in a pair is standardized by the international market. The order is based on a hierarchy established by the International Organization for Standardization (ISO) and long-standing interbank conventions. You cannot arbitrarily flip a pair — EUR/USD is the standard, not USD/EUR.

How to Read a Quote

A forex quote displays two prices: the bid (the price at which you can sell the base currency) and the ask (the price at which you can buy the base currency). For instance, if GBP/USD is quoted as 1.2650 / 1.2653, the bid is 1.2650 and the ask is 1.2653.

The difference between the bid and ask — in this case, 3 pips (0.0003) — is the spread. The spread is your immediate cost of entering a trade. If you buy GBP/USD at 1.2653, the pair needs to rise by at least 3 pips before you break even.

Most currency pairs are quoted to four decimal places (e.g., 1.2653). The exception is pairs involving the Japanese yen, which are quoted to two decimal places (e.g., USD/JPY at 149.85). Many brokers now display an extra digit — a fifth decimal place for most pairs, or a third for yen pairs — called a pipette, which represents one-tenth of a pip.

Major Pairs

The major currency pairs are the most heavily traded pairs in the forex market. They all include the US dollar on one side and are characterized by high liquidity, tight spreads, and abundant market analysis. The seven major pairs are:

• EUR/USD (Euro / US Dollar): The most traded pair in the world, accounting for roughly 23% of all forex volume. Known for tight spreads and smooth price action.
• USD/JPY (US Dollar / Japanese Yen): The second most traded pair. Heavily influenced by the interest rate differential between the US and Japan and by risk sentiment in global markets.
• GBP/USD (British Pound / US Dollar):Often called "Cable" (a reference to the transatlantic telegraph cable used to transmit prices in the 19th century). Known for higher volatility than EUR/USD.
• USD/CHF (US Dollar / Swiss Franc): The Swiss franc is considered a safe-haven currency. This pair often moves inversely to EUR/USD.
• AUD/USD (Australian Dollar / US Dollar):Closely tied to commodity prices, particularly iron ore and gold, due to Australia's resource-heavy economy.
• USD/CAD (US Dollar / Canadian Dollar):Strongly influenced by crude oil prices, as Canada is one of the world's largest oil exporters.
• NZD/USD (New Zealand Dollar / US Dollar):Similar to AUD/USD but with lower liquidity. Influenced by dairy commodity prices and the Reserve Bank of New Zealand's monetary policy.

Minor and Cross Pairs

Minor pairs (also called cross pairs or crosses) are currency pairs that do not include the US dollar. They are formed by combining two major currencies. While they have less liquidity than the majors, they still offer plenty of trading opportunities. Popular minor pairs include:

• EUR/GBP: Reflects the relative strength of the eurozone versus the UK economy. Tends to have lower volatility.
• EUR/JPY: A popular pair for carry trades and risk sentiment analysis. Combines the euro with the low-yielding yen.
• GBP/JPY:Known for its high volatility, earning it the nickname "The Dragon" among traders. Daily ranges of 150–200 pips are not uncommon.
• AUD/JPY: A classic risk-on/risk-off barometer. Tends to rise when global markets are optimistic and fall during periods of fear.
• EUR/AUD, GBP/CAD, AUD/NZD: Other commonly traded crosses that offer unique trading dynamics based on regional economic factors.

Spreads on minor pairs are typically wider than on majors — often 2–5 pips compared to 0.5–1.5 pips for the most liquid major pairs. This higher cost should be factored into your trading plan.

Exotic Pairs

Exotic pairs consist of one major currency paired with the currency of a developing or emerging-market economy. Examples include USD/TRY (US Dollar / Turkish Lira), EUR/ZAR (Euro / South African Rand), USD/MXN (US Dollar / Mexican Peso), and GBP/SGD (British Pound / Singapore Dollar).

Exotic pairs come with significantly wider spreads — often 10–50 pips or more — and lower liquidity. Price movements can be sharp and unpredictable, especially around political events or central bank decisions in the emerging-market country. Swap costs (the overnight financing charge) can also be substantial, either positive or negative, due to the large interest rate differentials between the two economies.

Exotic pairs are generally more suitable for experienced traders who understand the unique risks involved. Beginners are usually advised to focus on major and minor pairs until they have developed a solid foundation in forex trading.

Currency Correlation

Currency correlation measures how two currency pairs move in relation to each other. A correlation of +1.0 means the pairs move in perfect lockstep; a correlation of -1.0 means they move in exactly opposite directions; and 0 means there is no relationship.

Some well-known correlations include:

• EUR/USD and USD/CHF have a strong negative correlation (approximately -0.90). When EUR/USD rises, USD/CHF tends to fall, and vice versa. This is because both pairs have the USD on opposite sides.
• EUR/USD and GBP/USD have a strong positive correlation (approximately +0.80). Both pairs tend to move in the same direction because they share the USD as the quote currency.
• AUD/USD and NZD/USD are positively correlated due to the geographic and economic similarities between Australia and New Zealand.
• USD/CAD and crude oil have a negative correlation — when oil prices rise, the Canadian dollar tends to strengthen, pushing USD/CAD lower.

Understanding correlation is critical for risk management. If you hold simultaneous long positions in EUR/USD and GBP/USD, you are essentially doubling your exposure to US dollar weakness. Conversely, being long EUR/USD and long USD/CHF at the same time creates offsetting positions that may cancel each other out. Always check correlations before opening multiple positions to avoid unintended concentration of risk.