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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

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STEEM 0.06
TRX 0.32
JST 0.063
BTC 68104.09
ETH 2138.99
USDT 1.00
SBD 0.47