Essentially all forex brokers regulated by the UK’s Financial Conduct Authority (FCA) offers at least some of the major currency pairs for trading. These currencies include the US dollar-related trading pairs EUR/USD, USD/JPY, GBP/USD, and USD/CHF, which are the most liquid trading pairs in the forex market.
In general, the most traded and most liquid currency pairs also have the lowest spreads between their buy and sell prices at any given time. As a trader, it is highly important to ensure that this spread is as small as possible with the broker you choose. As all professional traders know, high spreads easily adds up over time and eats into your trading profits.