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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 0.29
JST 0.047
BTC 73596.33
ETH 2159.67
USDT 1.00
SBD 0.51