Through months of research I've narrowed down that if you scalp there's only one way to do it, and that's through a decent robot (none of this $99 rubbish). Most decent EAs are only available through a developer or an EA, sometimes you can get decent forex account managers to trade for you (requires research and they are limited).
Now the next step is to choose a broker that can handle your strategy without manipulation, market making activity, restrictions on trading and other games that they play to generate profits. Through testing and many hours researching, I found that you can only trade and generate profits through scalping on an true STP/DMA broker.
The next challenge are the trading conditions. Naturally, the lower the spreads, the better it is for scalping. Take into consideration that most STPs have their chart prices marked up - that means that if your EA/Robot reads prices off the chart rather than market watch, then you might experience some triggering issues.
My recommendation would be to find a broker with raw spreads and a low commission. The raw spread will give your EA the best possible platform to trigger your orders.
Of course, account conditions and order execution is crucial also. I currently trade with a broker that uses Equinix technology that reduces latency and the execution is super fast. As well, they have specific Liquidity providers who can handle all scalping strategies as well as very good conditions (EUUSD 0.2 -0.5)
I know these brokers are limited, and you won't find them among the biggest brokers lists as 99% of them are alleged market makers. You'll have to work a little harder and dig a little deeper as I did to find them
Hope this input helps you guys find a good broker for scalping?
Rick
seem you're already explain what i need to write down here, the method and thought you share here just like you already reading my mind. to find such brokers company are not easy, I'm now with Armada markets, would you mind to share your though about them. just like you stated, they also has a low spread 0.2-0.3 average on EU, commision based one, wont say i raw but it has low mark up. have a double cross check with fpa review page before i decided too, but it would be nice to have a proper review from expert scalper trader as you are .