I turned out that https://ultrafx.com/ does act as an introducing broker as well with 1K minimum, so I will go ahead and try them out. First I will try to connect SierraCharts to LMAX and test the performace as I already have an app connected to SC. This way I could save a lot of time developing an app. Hopefully this way I won't waste more than 1-2ms which is more than okay for me. BTW SC also uses their VPS for the LMAX connection.