i have compared it to other brokers with whom i have accounts.If you find that the volume is not consistent between the two feeds...would you still argue that it has any use?
if you represent volume by a graph and draw this graph using data from different sources, the SHAPE of the graph will be the same.
Absolute volume may vary widely but relative volume will be the same.
Why do prices from all brokers align? because if it did not align, arbitrage would take place, and in fact there is software that is available that claims to do just this.
What i am trying to say is that we are comparing volume between bars and if we compare bars in the same broker, we will get an idea whether volume is normal or not normal for the price movement in question.
All this only pertains to spot forex.
There are others like Wyckoff Gavin Holmes and Anna Coulman who say the same thing:Anna has written a book on how to trade VPA with forex
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