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.
If you found this indicator useful, please feel free to tip so that I can continue making more free indicators!
BTC: 1JkcVwaPZfvpqxGio4iz2aENa2gj8oowxi
ETH: 0x71d509eeb9f86296c3f55bb7e882d9e69e393b2a
EOS: 0x71d509eeb9f86296c3f55bb7e882d9e69e393b2a