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Keep in mind that the volume for NEM on CMC is not correct.
What you mean is not correct? I always tough it was accurate enough? Can you elaborate on that please? thanks.
Have a look:
https://coinmarketcap.com/currencies/nem/#marketsAbout $5 million from Zaif exchange is "** Volume Excluded - No Trading Fees".
Still, 5 million less is nothing compared to the any of the top 10 in volume. Have a look. 13 million volume is still not much.