trade within the spread

Hi traders,

with ECN broker it's usually possible to place a trade within the spread. You therefore can try to choose your own spread.
I've never tried how well that works.

For me as an MB-Trading client with MT4 - would it be possible to get these orders filled in volatile times?
Do scalpers always place orders within the spread or is it just a theoretical opportunity which actually no one uses?
If you can set your own spread and it's probable that the order gets filled, why don't everyone does it then?

I would be happy to hear about your experience in this matter!

best regards,
tradeigel.

What do you mean when you say "within the spread"?As i know spread is what broker earns, giving us access to forex. and when we start order we pay spread at first. so how it can be to place orders within the spread?