Sort:  

Excellent question. Sadly none of the exchanges here list overall volume over a period of time. However, one exchange, Coinsecure, is listing 50 BTC sell orders. That's the closest I can get to volume... It's still a fairly small market, but the price is real.

Coin Marketplace

STEEM 0.06
TRX 0.28
JST 0.048
BTC 71504.81
ETH 2065.39
USDT 1.00
SBD 0.51