Contracts are XBTM21 (June 21) XBTUSD (Perpetual contract)
This idea plots (XBTM21 - XBTUSD) as the blue series and plots XBTUSD as the candlestick series
The bitmex june future was trading at a $6,000 premium earlier today! Now has dropped back to $5,000.
Upon expiry the future spread will drift to zero ... So, selling short the future vs. spot you have is a great arbitrage trade if you want to capture the premium risk-free
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People are now paying a ~$7,000 premium (per BTC) for futures which expire in two months. This premium will go to zero by June 25th. There's money to be made here arbitraging contracts
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Update: that premium has now crashed - hit zero on the first dump then rebounded somewhat. Now drifting down to it's eventual target of $0