For accurate volume information you would need to aggregate volume data from major liquidity venues. There are some websites, forexfactory, myfxbook...etc, which provide volume information. But, i am not sure how accurate these data are.
Volume in forex uses price ticks. As price changes up and down, volume adds up. High volume has lots of such simple tick shifts, while low volume has very little. What does that tell us? In theory, increasing volume indicates growing interest, buttressing an existing trend or signaling a new one. That said, I haven't been able to create or improve a system with volume indicators.
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