Can US residents trade fx offshore?

Talked to a offshore broker, but still not sure if it is legal to have an account with them.

I really miss the days when FXCM was operating in the US!

No offense to your experience with them, but I had a seriously hard time making money with them. I didn't know until I switched brokers. FXCM used to lag up to 20 pips behind the rest of the market, then spike a candle to catch up. I kept trying to figure out what all the spikes were about, and how to trade them. It was awful. As soon as I started using a different broker, the market smoothed out and I realized what they had been doing. Also, I kept getting refunds for slippage based on fines they kept getting from regulators, probably due to all the spikes. I guess we had difference experiences.

Offshore destinations are famous for its light touch regulation if any, therefore US citizens as well as the rest of the world should be able to trade. They are attractive locations to forex and binary options brokers, as it is relatively easy and cost-effective for startups to register and run a brokerage business. Besides, offshore zones are generally known for their lax regulation and non-existent corporate taxes.
One of the most popular offshore jurisdictions are Belize, Mauritius, Saint Vincent and the Grenadines, Marshall Islands, British Virgin Islands, Cayman Islands, the Seychelles, Dominica and Vanuatu.