The complete daily Derivasys BTC options surface report archive, with 24-hour ATM IV, RR25, BF25 and fitted-smile changes. Reports from 18 July 2026 also include linked news context.
Reports from 18 July 2026 include contextual news. Earlier reports contain measured surface analysis only.
Bitcoin one-week BF25 increased 0.25 volatility points to 2.12%, the day’s notable surface adjustment, while one-week ATM IV rose 0.90 points to 40.47%. The BF25 measure captures the relative richness of options away from the centre of the distribution. DerivaSys data showed front-end ATM IV averaging 39.36%, up 0.69 points; Bitcoin’s 24-hour spot-index return was 0.02%, and one-week implied volatility remained 7.40 points above seven-day realised volatility.
Bitcoin one-week RR25 rose 1.52 volatility points to 1.31%, leaving call-side volatility richer than put-side volatility after the 16:30 UTC cutoff. One-week ATM IV simultaneously rose 2.86 points to 39.57%, while Bitcoin spot fell 0.24% over 24 hours. DerivaSys data put one-week implied volatility 6.10 points above seven-day realised volatility.
Bitcoin’s one-week RR25 fell 1.38 volatility points to -0.22%, making put-side volatility richer than call-side volatility. The move ranked at the 78.7 percentile among comparable observations. One-week ATM IV stood 2.49 volatility points above seven-day realised volatility, even as the front end eased modestly.
Bitcoin’s six-month BF25 rose 0.12 volatility points to 2.68%, the day’s notable surface adjustment. Meanwhile, one-week ATM IV increased 2.36 points to 36.83% and the front-end average reached 37.24%, while longer-dated ATM IV was broadly unchanged. The result is a firmer near-term volatility surface alongside modestly richer six-month convexity.
Bitcoin one-week ATM IV rose 3.24 volatility points to 34.95%, a notable move at the 82.8 percentile of comparable history. The front end lifted more than longer maturities, while one-week RR25 moved toward call-side volatility. Bitcoin one-week implied volatility nevertheless remained 1.59 points below seven-day realised volatility.
Bitcoin two-week RR25 rose 2.89 volatility points to 1.99%, moving call-side volatility above put-side volatility in a large 96.2 percentile move. The adjustment coincided with a 5.75-point rise in one-week ATM IV, while the 1Y-minus-1W ATM slope became less steep.
Bitcoin one-week implied volatility fell 2.33 volatility points to 31.03%, leaving it 4.04 volatility points below seven-day realised volatility. At the same tenor, relative put-side volatility increased: 1W RR25 fell 1.07 volatility points to -1.02%. The longer-dated curve remained higher than the front end as the 1Y-minus-1W ATM IV slope widened to 10.97 volatility points.
BTC’s front end firmed into the 20:58 UTC cutoff, while the long end was largely unchanged and the curve flattened. The largest standard-tenor move was a routine 1W ATM IV increase, but 2W RR25 moved notably toward relative call-side volatility. Collected news supplied contemporaneous macro and crypto developments, yet the available reaction evidence does not establish a direct explanation for the closing repricing.
Bitcoin rose 1.55 per cent over the 24-hour window, but the options market did not chase the move: one-week implied volatility added only 0.19 points and one-month volatility slipped. Skew became less defensive, while seven-day realised volatility remained above the one-week implied measure. The news backdrop offered useful institutional and on-chain context, though neither item provides a convincing explanation for the restrained repricing.
Bitcoin fell 1.76 per cent over the 24-hour window as the market continued to digest Kevin Warsh’s warning that inflation could require tighter policy. The options response was more nuanced than the spot move: one-week implied volatility fell 3.69 points to 32.85 per cent, while two-week risk reversal moved sharply towards puts. One-week implied volatility now sits below seven-day realised volatility but above the quieter 24-hour measure, leaving the curve steeper rather than uniformly subdued.
Bitcoin ended the session below $80,000 as investors absorbed Kevin Warsh’s first major Jackson Hole address and a $6.4bn options expiry. The Federal Reserve chair offered little encouragement to those looking for an early easing signal, while the derivatives settlement removed a sizeable block of open interest. Against that backdrop, one-week implied volatility fell sharply and slipped below seven-day realised volatility, leaving the surface steeper rather than uniformly cheaper.
Front-end ATM IV fell sharply, while relative put-side volatility increased modestly and implied volatility remained below seven-day realised volatility.
ATM volatility declined at both the front and long ends, while RR25 shifted modestly toward puts and 1W implied volatility remained below seven-day realised volatility.
Front-end ATM IV rose sharply, with 1W IV reaching 44.02%, close to seven-day realised volatility of 44.90% but well below the 24-hour rate of 74.18%; RR25 moved toward calls and BF25 increased.
