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RE: Why is median_history_price no longer the median of feed price? My investigation.

in #witness-category • 5 years ago (edited)

Thank you for this great write-up. It will take me a while to process this fully.

So this price feed is calculated like this right now?

285,502,123 STEEM / 13,077,523 SBD

9 x 13,077,523 = 117,697,707 SBD (STEEM SBD value MAX).

117,697,707 SBD / 285,502,123 STEEM = $0,413 = Price feed.

5 years ago in #witness-category by
$0.37
  • Past Payouts $0.37, 0.00 TRX
  • - Author $0.28, 0.00 TRX
  • - Curators $0.09, 0.00 TRX
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     5 years ago 

    To get the feed price, the better way is call get_feed_history(), For example:

    curl --data '{"jsonrpc": "2.0", "method": "call", "params": ["database_api", "get_feed_history", []], "id": 1}' https://api.steemit.com

    The result:

    The we just get feed price (median_history_price) by
    base / quote in current_median_history

    So it should be:
    117695452.311 / 285504114.958 = 0.41223732389396

    Use the value from get_dynamic_global_properties and the formula in https://github.com/steemit/steem/blob/master/libraries/chain/database.cpp#L3258 will got the same result, but get_feed_history handles all situations.

    Another thing to remember is median_history_price updated every hours, So the real-time results calculated by get_dynamic_global_properties may be slightly different

    $0.03
    • Past Payouts $0.03, 0.00 TRX
    • - Author $0.03, 0.00 TRX
    • - Curators $0.01, 0.00 TRX
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