Most binary options brokers offer a number of popular currency pairs – also called forex pairs – for their clients to trade. However, some brokers offer currencies only as traditional forex trading instruments, while others allow their clients to trade binary options with currencies as the underlying asset. Lastly, some brokers have the full package by offering both traditional currency trading and binary options currency trading.
In currency trading, the largest currencies are far more popular among traders than the smaller ones. This is mainly because large currencies tend to have tighter spreads between buy and sell prices, which helps keep the cost of trading down. Among all currency pairs, the EUR/USD is by far the most traded one.