Currenex is a technology provider not a trading platform..as above you will need to find a broker that uses the Currenex technology but it will include that brokers rates. If you download the demo from Currenex website these rates are not reflective of the rates you would get at a broker...
Is this retail or Institutional business? If institutional 90% of those platforms you have listed cannot be included in the list as they dont have the liquidity.
Currenex does not offer direct retail connection you are required to go through a whitelable partner so if you take a demo direct from the currenex website it could be very much different in terms of liquidity and functionality once you actually sign with one of their partners.