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sbd_exchange_rate is basically the price of steem in usd. I think any node should have that, but I'm not sure

I was playing with that earlier and it didn't seem to match up with what I was seeing on steemprices. I'm also not sure if you can get a rate at a given point in time.

I do it manually, but I check steemd.com and look at witnesses when they publish the price feed.... @delegate.lafona is very consistent.