i don't see any real advantages of trading on FXCM. they are not any better than any other fx shop, with metatrader or without. and you must trade big money to qulify for their API trading.
as far as i am aware of FXCM also offers currenex access via FIX for big accounts, but their conditions are far from the best offers of other brokers.

What about Man Financial?
They said they are ECN broker.
MF Global Canada - Products & Services - Online FX Trading

yes, MAN offers currenex too

and... can you make a bridge?

yes, i have it already (mt4 to currenex), but without feed yet.
read my post ECN Trading

I thing you need access to MT4 Server.
When you will have a feed?

sure, making feed on the server end is better, but it is possible to make offline charts with currenex data and trade on them (see my 1st post). of course it will not replace "market watch" quotes and it will not be possible to trade manually. but MT is used mainly as autotrading platform and manul trading can be done in any other terminal (including my .NET software)

for now i do not have plans for it.
if you are ready to invest some money to pay for my work, then i think i could complete it in 1 month.

what are your goals of going to trade on currenex/ECN? what benefits do you hope to achieve?

I allready testing MT4/Currenex.
I have a problem with pipets.
EA's are not working properly.
Many trades are looking for login
between MT4 and client trading station.
That will be interesting.

not sure i get completely what you are saying.
if you have some product already, then deal with it's seller/developer. this forum will not help you with that.

I already testing the bridge between MT4 and Currenex.
But feed is as: 1.40775 (5 digits after .), last one is pipet.
What I'm looking is link between 2 client trading stations,
as MT4 and ABC. On MT4 you can use EA's, on FXCM no.