At this moment our best Forex broker in Cayman Islands is: FP Markets. If you are browsing for an alternative to B4 Binary you should start there. To each of the top brokers available for you, see our list: Forex Trading Cayman Islands. If you wish to visit B4 Binary anyway, www.b4binary.com is their website.
Get the full details here: Is Forex trading legal in Cayman Islands?