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I really doubt it. Changelly will have to do the change themselves on the exchange and thus have to charge a % to make sure they don't get under.

Do you mean on the "market" that is linked to in our Steem Wallet?
I haven't tried that yet.
Or do you mean an exchange like Kraken or Poloniex?

I mean Poloniex and Bittrex. Steem isn't on Kraken, yet... For some reason the internet market price is lower than on external market. It might not always be true.