I have been holding a zero prime account with stp trading for over 6 months. What is of vital importance to me as a scalper is the execution speed. Fortunately, there is no difference between the ask price and the executed price with this broker, even during times of strong market volatility. Spreads on major currency pairs are quite competitive and I did not see any manipulation on the charts. The deposit and withdrawal process via crypto was also very fast, taking less than 2 hours. I hope this quality of service continues.