All marke makers, no matter who must always stay at Interbank prices. The only different is adding 2 pips or so to the spread, thats it. People have to understand, quick searching for something that is right in front of you. When I traded Interbank prices, all it was tighter spread and more slippage. If any market maker is off the market by 10 pips, there will be millions among millions traded on 1 click, because they are lagging in time. You can also compare Broker to broker. I have
demo accounts of all other brokers while I trade my account. You can see who is the slow guy. They get nailed. Technically, thats when you are also put on manual execution after a few times. When the brokers P/L is printed everyday, if not by every hour, they look and see who is nailing them. IF it is very quick and fast, and they go back and double check the market prices and they were off market, thats when I called you and had a talk. That was the part of the job I hated. I didn't make any friends anytime there.
But in summary. We are looking at Interbank prices, period. Just different spreads. IF a broker is off market they will get killed, plain and simple.