A 6.92% hourly reversal at the week's high forces a fresh margin schedule for leveraged clients
Should the risk team raise BTC margin requirements now, using this week's 87.8% annualised realised volatility and the 6.92% hour, or keep the schedule set in the calmer weeks before?
The market facts are real; the decision maker is illustrative.
The week and the position
In the week of 27 July 2020, BTC rose 11.48% to 11,071.35 with a 22.25% range, a low of 9,917.21 on Monday and a high of 12,123.46 on Sunday at 04:00 UTC. That Sunday hour carried the week's largest 1h move, -6.92%, and Sunday was also the worst day, at -6.18%. Realised volatility reached 87.8% annualised, dollar volume was 1.81 times the prior 12-week average, and perpetual funding averaged 0.0663% per eight hours, peaking at 0.1395%. The four prior weeks ranged from -1.01% to +7.85%. An illustrative risk team sets margin for leveraged BTC clients under terms written before this week, when weekly returns ran from -1.01% to +7.85%.
Judgment
The schedule was built for weeks like the prior four and now faces a market that moved 22.25% in range and 6.92% against longs within one hour at the top. Raise both initial and maintenance margin for leveraged BTC positions, and set the levels from the worst hourly move and the 87.8% realised volatility rather than the 11.48% weekly return, since maintenance is breached by the hour, not the week. The team accepts that higher margin reduces leveraged volume on the venue while average eight-hour funding stays positive at 0.0663%.
What would change it
If realised volatility falls back towards the prior weeks' levels for several consecutive weeks and no further hourly move approaches 6.92%, the schedule can be stepped back down. If funding turns negative, the crowded long positioning argument for tighter margin weakens.
What sets this case apart
Margin is set from the worst hour of a rising week, not from the weekly gain, and the reversal trigger ties relaxation to sustained volatility decay.