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Though SBD is pegged, it fluctuates too at its peak $2 to $0.85. USDT is for external traders in the exchanges (Poloniex or Bittrex) who want to be in or out. When somebody in steemit, they can trade within steemit market with STEEM/SBD, that is a different issue.

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STEEM 0.06
TRX 0.28
JST 0.047
BTC 66941.38
ETH 1999.27
USDT 1.00
SBD 0.46