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Online Foreign Exchange Brokerages: Which ones are good & reputable for smaller trades? 
I used Oanda.com for Forex trading a couple years ago. I am in the US but I think it's available in the UK as well. At the time, they had no commissions and their spreads were comparable or better than other brokers. The spreads would just quite considerably when a big event like a Fed meeting or the unemployment figures come out, but I suspect that that is the same everywhere (or they have constant spreads and reject trades).  They did not push the high leverages like other brokers were at the time. I considered this to be very reputable, because though the profits to be gotten through 100:1 leverage are great advertising, the reality is that one unexpected spike and a newbie would lose a bunch of money in a margin call.