BTC Contango indicator

This is a Bitcoin contango indicator, which tells you the difference in price between the price of the specified BTC futures contract and the current spot price. A viable strategy is to sell when "contango" occurs, which means the futures price is greater than the spot price (green line, above 0), and buy when it is below.

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BTC: 1JkcVwaPZfvpqxGio4iz2aENa2gj8oowxi
ETH: 0x71d509eeb9f86296c3f55bb7e882d9e69e393b2a
EOS: 0x71d509eeb9f86296c3f55bb7e882d9e69e393b2a