Forex How effectively can volume be implemented in forex?

As I understand it, volume in currency market (unlike in stock markets) is impossible to accurately measure in real time - since there is no centralised exchange through which it is traded. Correct me if I'm wrong, but the 'Real Volume' indicator on your platform just shows the volume of trades passing through your broker. Does this make the volume indicator useless, or is it a representative sample of the actual volume?

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