Monero is #2 in volume today on coinmarketcap.com
Second only to Bitcoin in volume. (Monero 24hr volume = $10,682,800)
Sheesh, how is this possible with so few exchanges trading Monero?
It is possible because XMR/XBT on Poloniex is the 4th largest Bitcoin market.
https://coinmarketcap.com/currencies/bitcoin/#markets I have seen in the past where it was the largest Bitcoin market.