I'm doing some work for a client and need to create a line graph of historical premium between BTCUSD and BTCUSD Quarterly.
https://testnet.binancefuture.com/fapi/v1/premiumIndex?symbol=BTCUSDT https://testnet.binancefuture.com/fapi/v1/premiumIndex?symbol=BTCUSDT_210326
However when I hit these 2 urls I get almost exactly the same price, but when I view the March 2021 on the Binance platform it does show a much higher price.
Has anybody come across this and is there a way to calculate what the future price is actually trading at.
Any guidance would be much appreciated
Thanks