Quote from buzz buzz:
Can I trade on Currenex for instance?
Yes, you can trade on CurrenEx. PFG Best, ODLS, Capital,
Man, Fimat... all offer CurrenEx access.
Other liquid quasi-ECN's include LavaFX and HotspotFXI.
The above named brokers can give you access to these
also.
If you want access to EBS Prime try RBS, UBS, or ABN/Amro.
Smaller broker-owned ECN's giving access to interbank
liquidity include EFX/MB, CoesFX, and IB's IDealPro. The
first two of these have sufficient liquidity for a $1 million
account size.
EFX/MB just placed first in Barron's survey of online brokers.