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?
Poloniex and Bitfinex are huge exchanges. Polo also offers margin trading. The rest of the altcoin market has been dead in volume so Monero will naturally be way up there in volume.