Sort:  

We have 2 options. First and simple is internal exchange. Second is Poloniex, but now its looks like under maintenance https://poloniex.com/exchange#BTC_SBD

Coin Marketplace

STEEM 0.17
TRX 0.15
JST 0.028
BTC 60638.91
ETH 2449.26
USDT 1.00
SBD 2.52