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Usually they are pretty close because of arbitrage opportunities. I haven't done the math lately, but usually open markets keep things in sync.

oh ok. So internal market is ok to use to sell sbd, but using convert option is not good, right? Thanks

Convert is helpful when SBD are below $1 (and you think they will remain below $1 for more than 3.5 days). Otherwise, use the internal market or sell on an external exchange.