Base Currency

The base currency is the first currency listed in a forex pair and represents what you are buying or selling. In EUR/USD, the euro is the base currency. When you buy this pair, you are buying euros while simultaneously selling US dollars. The exchange rate tells you how many units of the quote currency are needed to purchase one unit of the base currency.

Position sizes in forex are always measured in units of the base currency. A standard lot of EUR/USD is 100,000 euros. A mini lot of GBP/USD is 10,000 British pounds. This convention matters for margin calculations, because margin requirements are set as a percentage of the base currency notional value converted to your account currency. Understanding which side is the base clears up a lot of confusion about what you actually own during a trade.

For example, if you buy 1 standard lot of EUR/USD at 1.0850, you control 100,000 euros and you owe 108,500 US dollars. If the price rises to 1.0900, your 100,000 euros are now worth 109,000 US dollars, producing a 500 dollar profit. Conversely, if you sell EUR/USD, you are selling euros and buying dollars, profiting when the euro weakens.

In copy trading, understanding the base currency helps subscribers read pip values correctly across different pairs. SteadyFlowFX's 9 algorithms trade 8 currency pairs with varying base currencies, each producing a different dollar-per-pip value. Knowing which currency is the base on each copied trade helps subscribers verify position sizing and understand why profit calculations differ between pairs.