A true ECN is a system that allows routing your trade to another member of the ECN. The vendor or agency that provides the software (and sometimes hardware) could be a neutral broker or just a technology provider agency. If is a neutral broker their commission per transaction should be very low. They won’t take the other side of your trade and might offering you to deposit with them but as extra services.
An ECN broker is the preferred choice of many forex traders as these are known to provide one of the best trading conditions in forex business. In this regard it is very important to identify an ECN broker from a market maker. Now there are some brokers that are both ECN and STP and such brokers are opted by many traders because they offer faster and more efficient execution of trades, tighter spreads, low commissions, and more precise pricing. Check out the list fx-list.com/ecn-forex-brokers of Forex Brokers that presumably offer true ECN trading accounts, alongside with other types of accounts. The net connects various brokerage companies, liquidity providers and individual traders in one place