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It seems that the internal market prices can and do vary from the external prices.

In my case I used BTC to purchase STEEM through Changelly.

I see - I am new to this whole crypto concept and don't have any of those resources. So I'm on the internal market for now :)

Coin Marketplace

STEEM 0.15
TRX 0.24
JST 0.033
BTC 91880.20
ETH 2498.95
USDT 1.00
SBD 0.68