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It uses the weighted median of the week between the request and the conversion to calculate the amount of Steem you get. Doesn't help when you sell those at a loss.

Thanks! I was going to edit this post once I found out that it was the median price for the entire week! I'll leave it as is for the sake of readability since all the edits can be seen on the blockchain, but the Steemit UI doesn't show them.