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They have a common technological base.
They are both the work of Dan Larimer and his team.
You can trade STEEM and SBD on the BitShares internal exchange (aka OpenLedger).

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STEEM 0.29
TRX 0.12
JST 0.033
BTC 63318.34
ETH 3108.17
USDT 1.00
SBD 3.97