I've been looking for a true stp broker for high frequency trading strategy.

The strategy is implemented by an EA so need MT4 trading account with low spread and low commission too.

I have a shortlist of Yadix and JFD. Both have good execution, JFD have many stocks that I'll never trade and commissions are high, Yadix is slightly faster execution and better filling (less slippage) for me, and the commissions on their ECN account are very low.

Profits have been good and steady with no delays or problems on the withdrawals of profits at Yadix. I'd recommend Yadix for institutional high frequency trading.