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estimated value is based on the average price of steem over the last 7 days.

It used to be that but was changed to 3.5

yes

was gonna check steemd if anything there would show any signs of why, but seems to be down currently, for anyone else too?

It seems like the feed itself is fine, because nothing has happened to pending payouts (which are also directly from the feed). I am guessing there is some change to the display logic.

steemd.com is up for me.