The foreign exchange (forex) market is where currencies are bought and sold 24 hours a day, five days a week. With daily trading volume exceeding $9.6 trillion in April 2025, according to the Bank for International Settlements (BIS) Triennial Survey, it is the world's largest and most liquid financial market. This guide explains how buying and selling forex works, from the basic mechanics to advanced considerations.
Buying and selling forex is the simultaneous exchange of one currency for another. Unlike stocks or commodities, forex trading always involves a currency pair: you are buying one currency (the base currency) and selling another (the quote currency). The exchange rate tells you how much of the quote currency you need to buy one unit of the base currency.
For example, the pair EUR/USD represents the euro (EUR) as the base and the US dollar (USD) as the quote. If EUR/USD is 1.1050, it means 1 euro equals 1.1050 dollars. Buying this pair means you expect the euro to appreciate against the dollar; selling (going short) means you expect the euro to depreciate.
According to the BIS April 2025 survey, the US dollar was on one side of 89% of all transactions, underscoring its central role in the global currency market. The euro, yen, and pound are the next most actively traded currencies.
Every forex trade is expressed as a pair: Base/Quote. The base currency is the one you are buying or selling, and the quote currency is the one you are using to make the exchange. There are three broad categories of pairs:
When you place a trade, you specify the size (lot) and direction. A standard lot is 100,000 units of the base currency. Leverage allows you to control a large position with a relatively small margin. For example, with 50:1 leverage (the maximum allowed for retail traders in the US under CFTC rules), you can control a $100,000 position with just $2,000 in margin. This amplifies both gains and losses.
The CFTC (Commodity Futures Trading Commission) mandates that retail forex brokers in the United States register with the agency and become members of the NFA (National Futures Association). The NFA provides the BASIC database, which allows investors to verify a firm's registration status and disciplinary history. This is a critical step before opening an account.
Every currency pair has two prices: the bid (the price at which the market buys the base from you—your selling price) and the ask (the price at which the market sells the base to you—your buying price). The difference between them is the spread, which is the broker's commission.
A pip (percentage in point) is the smallest standard price movement in a currency pair. For most pairs (EUR/USD, GBP/USD), a pip is 0.0001 of the exchange rate. For JPY pairs (USD/JPY), a pip is 0.01. Many brokers now quote to a fifth decimal place (fractional pips or pipettes), which allows for tighter spreads and more precise pricing.
| Currency Pair | Typical Spread (USD Standard) | Pip Value per Standard Lot | Liquidity Tier |
|---|---|---|---|
| EUR/USD | 0.6 – 1.2 pips | $10 per pip | Highest |
| USD/JPY | 0.8 – 1.5 pips | ≈$10 per pip | Very High |
| GBP/USD | 0.8 – 1.8 pips | $10 per pip | High |
| USD/CHF | 0.9 – 2.0 pips | ≈$10 per pip | High |
| EUR/JPY | 1.2 – 2.5 pips | ≈$10 per pip | Medium |
| USD/TRY | 15 – 50 pips | ≈$10 per pip | Low |
Spreads are indicative and vary by broker, time of day, market conditions, and account type. Verify current spreads with your broker.
The vast majority of forex trading is speculative—traders aim to profit from exchange rate fluctuations. Retail traders, hedge funds, and proprietary trading desks all participate in this market.
Multinational corporations use forex to hedge against foreign currency exposures. For instance, an American company with a subsidiary in Europe might sell EUR/USD forward to protect against a decline in the euro relative to the dollar.
Importers and exporters buy or sell currencies to pay for goods and services. Central banks also intervene in the forex market to stabilise or adjust their domestic currency's value.
Individual traders speculate on currency movements using leverage, typically with mini or micro lots.
Banks, asset managers, and hedge funds trade large blocks of currencies for profit or to meet client needs.
Before buying or selling a currency pair, traders evaluate several factors. Below is a comparison of two major approaches to evaluating forex trades.
| Criteria | Fundamental Analysis | Technical Analysis |
|---|---|---|
| Focus | Economic data, interest rates, geopolitical events | Price charts, patterns, indicators |
| Time Horizon | Medium to long term | Short to medium term |
| Key Data | GDP, CPI, employment, central bank policy | Support/resistance, moving averages, RSI |
| Decision Trigger | Economic release or policy change | Technical signal (e.g., breakout, crossover) |
| Source | Federal Reserve, BIS, IMF | Broker platform, charting software |
This is one of the most dangerous misconceptions. According to the CFTC, two out of three retail forex traders lose money each quarter. Forex trading requires education, discipline, and a sound risk management system. There is no guaranteed path to profits.
Not necessarily. A trader with a win rate of 40% can be profitable if they have a positive risk-reward ratio (e.g., average win is three times average loss). This is known as the “reward-to-risk” approach, and it is a fundamental tenet of sound trading. Many experienced traders have win rates below 50%.
While economic fundamentals matter, currencies are also influenced by global capital flows, risk sentiment, and carry trade dynamics. The BIS notes that “global factors, such as US monetary policy, often dominate local fundamentals in determining exchange rates”.
This is only true if your broker offers negative balance protection—which is not always guaranteed. In volatile markets, a stop-loss can be gaped, and you may end up owing more than your deposit (a debit balance). The CFTC requires brokers to disclose this risk. Always read the risk disclosure carefully.
Leveraged forex trading carries substantial risk of loss and is not suitable for all investors. The CFTC warns that “the high degree of leverage can work against you as well as for you. Before deciding to trade foreign exchange, you should carefully consider your investment objectives, level of experience, and risk appetite.”
This guide does not provide personalised financial, legal, or tax advice. Always verify current rules, fees, spreads, rates, broker availability, and platform terms with the relevant authority or provider before making any trading decision. The NFA BASIC database is a critical resource for checking broker registration and disciplinary history.
Buying and selling forex means exchanging one currency for another simultaneously. You buy one currency (the base) and sell another (the quote), profiting from changes in the exchange rate.
You make money by correctly predicting that the base currency will appreciate or depreciate against the quote currency. If you buy a pair and the base rises, you profit; if it falls, you lose.
A pip is the smallest standard price move in a currency pair. For most pairs, a pip is 0.0001. For JPY pairs, a pip is 0.01. Pips measure changes in exchange rates and are used to calculate profits and losses.
A long position means buying a currency pair expecting the base currency to rise. A short position means selling the base currency expecting it to fall. In both cases, you are trading the direction of the base currency relative to the quote.
In the US, the CFTC limits retail leverage to 50:1 for major pairs and 20:1 for minor pairs. In other jurisdictions, leverage can be much higher (up to 500:1), but this substantially increases risk.
The spread is the difference between the bid (sell) price and the ask (buy) price. It represents the broker's commission. Spreads vary by currency pair, market conditions, and broker. Major pairs tend to have the tightest spreads.
Yes, forex trading is regulated by the CFTC and the NFA in the US. Retail brokers must register with the CFTC and become NFA members. The NFA BASIC database allows you to verify registration and disciplinary history.
Risks include leverage risk (amplified losses), market risk (volatility), counterparty risk (broker default), and fraud. The CFTC warns that two out of three retail forex traders lose money.