Check Marketiva address here.
http://www.marketiva.com/index.ncre?page=locations
There are not registered with CFTC or NFA yet so they can't provide services to US people at the moment. U can't expect it very soon because Marketiva just launched last year. :)
Marketiva implement zero-interest policy right now which means no overnight interest charged/paid. I like to trade with them,they're good forex dealer. :)
I am happy trading with them,already joined few months ago,so far so good. They implement zero-interest policy right now which means no interest charged/paid. :)