Despite being able to trade 24 hours a day, 5 days a week, you shouldn’t (Forex trading is not quite 24.7). You should only trade a forex pair when it’s active, and when you’ve got enough volume. Trading forex at weekends will see small volume. Take GBP/USD for example, there are specific hours where you have enough volatility to create profits that are likely to negate the bid price spread and commission costs.
The sheer size of the forex, or foreign exchange, market dominates all others — even the stock market. Every payment that crosses currencies contributes to its fluctuations and momentum. And without a centralized marketplace, forex activity buzzes practically without cease, with traders waking up and doing business everywhere, in every time zone. To get a piece of the action, you need a forex brokerage with best-in-class technology and stellar support.
The need to exchange currencies is the primary reason why the forex market is the largest, most liquid financial market in the world. It dwarfs other markets in size, even the stock market, with an average traded value of around U.S. $2,000 billion per day. (The total volume changes all the time, but as of August 2012, the Bank for International Settlements (BIS) reported that the forex market traded in excess of U.S. $4.9 trillion per day.)