This script tracks the premium of the Bitcoin Perpetual futures at Bimex exchange relative to 3 different reference prices.
The difference between this script and already published scripts is that it tracks the premium relative to 3 different reference prices. This tends to produce slightly different results.
This script is also open source, so you can verify the calculations, or use it as a basis for your own script.
The 3 plots uses the following reference prices:
Blue Area:
Bitmex Index price, ticker: BITMEX:XBT
Red line:
Bitmex Perpetual Premium, ticker XBTUSDPI
(This one is not used as reference, but simply plots the ticker*100)
Orange line:
The reference here is a price calculated by the tickers in trading view based on the Bitmex indices with weighing as follows:
Bitstamp:28,81%
Bittrex:5,5%
Coinbase: 38,07%
Gemini: 7,34%
Kraken: 20,28
Please note that Bitmex changes the bases of its indices regularly. Bitmex might also "rule out" on of these exchanges if there is a short term problem.