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I think the prop is called "median_price_feed". There are a few more witnesses which are setting this prop (having price feed bias above 0%), me included. What you get when you call get_median_price_feed on the blockchain is pretty much the ratio between SBD and STEEM in rewards (the base and quote ratio, I mean).

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STEEM 0.17
TRX 0.14
JST 0.028
BTC 59631.75
ETH 2622.60
USDT 1.00
SBD 2.41