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.
Daily archive
Newest daily report first.
186 reports
Latest BTC daily · No relevant catalyst identified
Bitcoin two-week BF25 rose 0.44 volatility points to 1.94% over the daily observation window ending September 30, an exceptional convexity increase in Derivasys data. The change in options-surface curvature accompanied an easing of volatility near the underlying price. Bitcoin front-end ATM IV averaged 32.24% across one-week, two-week and one-month tenors, down 1.49 volatility points, distinguishing the butterfly adjustment from a broad increase in implied volatility.
Bitcoin one-week call-minus-put RR25 rose 1.07 volatility points to -0.24% over the 24-hour observation window ending September 29, according to Derivasys data. The shift reduced relative put-side richness and brought the skew close to neutral, although puts still carried slightly higher implied volatility than comparable calls. RR25 compares call-side and put-side volatility; this movement describes their relative balance rather than an absolute change in either wing. The skew adjustment accompanied softer volatility implied by options near the underlying's current price.
Derivasys data show Bitcoin six-month BF25 fell 0.30 volatility points to 2.05% over the daily observation window, an exceptional move against its recent history. BF25 measures how much implied volatility at the option wings differs from the at-the-money level; its decline does not mean every Bitcoin implied-volatility measure fell. Bitcoin one-week at-the-money implied volatility, drawn from options near the underlying price, rose 2.78 points to 34.60%. The contrasting moves put a quieter six-month butterfly alongside a firmer front end.
Derivasys data show Bitcoin one-week at-the-money implied volatility rose 2.06 volatility points to 32.76% over the observation window, concentrating the repricing in short-dated options. At-the-money IV is the volatility implied by options near Bitcoin’s current price. Bitcoin front-end ATM IV rose on average, while long-dated ATM IV edged down. The split matters because a rise in the short end alone gives a different reading from a parallel increase across maturities.
Bitcoin options became more put-rich at the three-month tenor between 25 September, 18:31 UTC and 26 September, 18:31 UTC. Derivasys data show Bitcoin three-month RR25, the implied-volatility difference between comparable calls and puts, falling 0.33 volatility points to minus 1.05%. That is a relative shift toward puts, rather than evidence that put implied volatility rose outright. Bitcoin one-week ATM IV also increased, but its move was routine against its available history. The two changes point to a firmer front-end volatility level alongside a more defensive medium-term skew.
Bitcoin one-week BF25 fell 0.34 volatility points to 1.65%, signalling lower relative pricing of wing volatility at the cutoff. Bitcoin one-week ATM IV also fell 2.56 volatility points to 29.94%, while the 24-hour spot-index return was -0.56%. One-week RR25 rose 1.24 volatility points to -0.91%, meaning the relative skew shifted toward calls but remained put-rich.
Bitcoin one-week ATM IV fell 2.10 volatility points to 31.70% over the observation window, while Derivasys data put front-end ATM IV at 33.00%, down 1.32 volatility points. One-week RR25 declined 0.86 volatility points to -2.60%, meaning put-side volatility became richer relative to call-side volatility even as the broad front end eased.
Bitcoin one-week RR25 fell 3.05 volatility points to -1.89%, shifting relative volatility toward puts from a call-rich reading at the prior cutoff. Bitcoin one-week ATM IV fell 2.46 volatility points to 34.13%, while Bitcoin front-end ATM IV across one week to one month averaged 34.55%, down 1.97 points. The Bitcoin 26SEP26 forward price fell 2.53% to $84,426.48. One-minute realised-volatility comparisons were unavailable.
Bitcoin two-week BF25 fell 0.79 volatility points to 1.70% over the observation window, an exceptional move at the 100th percentile of the available 30-day comparison set. BF25 measures the premium assigned to options away from the centre of the distribution. Separately, Bitcoin one-week ATM IV fell 2.86 points to 36.50%, while Derivasys data showed the nearest eligible forward proxy, 25SEP26, up 0.80% to $86,678.24.
Bitcoin one-week ATM IV rose 4.76 volatility points to 38.96% over the observation window, a large move at the 91.3 percentile of comparable history. The 24SEP26 Bitcoin forward-proxy price rose 5.80% to $85,954.72. Derivasys data also show the front-end ATM IV average rose faster than the long end, while three-month RR25 shifted toward calls but remained negative, leaving relative put-side volatility richer.
Bitcoin two-week RR25 fell 1.28 volatility points to -0.26% at the 16:30 UTC cutoff, moving from call-rich to put-rich pricing and marking a notable 80.5 percentile move in comparable history. Bitcoin two-week ATM IV simultaneously fell 0.85 points to 33.70%, while Bitcoin’s 24-hour spot-index return was -0.83%. Derivasys data show one-week ATM IV at 33.98%, 3.14 points below seven-day realised volatility of 37.12%.
Bitcoin two-week BF25 rose 0.45 volatility points to 2.06%, marking the day’s most notable surface adjustment, while Bitcoin one-week ATM IV rose 2.51 points to 34.63%. Bitcoin’s 24-hour spot-index return was 1.22%, and Bitcoin one-week ATM IV was 1.68 points below seven-day realised volatility at the cutoff. Derivasys data show the front end repriced more than longer maturities.
Bitcoin two-week RR25 rose 1.34 volatility points to 0.69%, reversing from a Bitcoin two-week RR25 reading of -0.65% and leaving calls richer than puts at the cutoff. Bitcoin’s two-week RR25 move was notable at the 82.3 percentile of comparable history. Bitcoin’s 24-hour spot-index return was 5.73%, while Bitcoin one-week ATM IV of 32.05% stood 3.54 volatility points below Bitcoin seven-day realised volatility of 35.59%, according to Derivasys data.
Bitcoin one-week ATM IV fell 7.15 volatility points to 29.56% over the 24-hour observation window, a large reset in Derivasys data. Bitcoin spot-index return was positive 1.16% over the same 24 hours. At the cutoff, Bitcoin one-week ATM IV stood 7.20 volatility points below seven-day realised volatility of 36.76%, meaning the options-implied measure was below the completed trailing realised measure.
Bitcoin one-week ATM IV fell 6.73 volatility points to 36.61% over the 24-hour observation window, a 95.2 percentile move in Derivasys history. Bitcoin’s 24-hour spot-index return was -0.87%, while one-week ATM IV remained 2.01 volatility points above seven-day realised volatility of 34.60%. The reset was concentrated at the front end, where ATM IV averaged 36.12%.
Bitcoin one-month RR25 fell 1.71 volatility points to -2.10%, leaving put volatility richer than call volatility at the 21:01 UTC cutoff. The shift was large relative to its available history, while Bitcoin one-week ATM IV rose 1.20 volatility points to 39.43%. Bitcoin’s 24-hour spot-index return was -3.91%, and Bitcoin one-week ATM IV stood 4.40 volatility points above seven-day realised volatility. Derivasys data show a more defensive relative-volatility profile even as front-end implied volatility rose only modestly.
Bitcoin’s one-week RR25 increased 0.62 volatility points to -0.15%, leaving put-side volatility still richer than call-side volatility but materially less so than at the prior snapshot. At the same time, one-week ATM IV fell 1.50 points to 36.60%, while the 24-hour spot-index return was 1.84%.
Bitcoin one-week ATM IV rose 3.33 volatility points to 38.10% over the observation window, placing the short-dated volatility gauge at the 74.1 percentile of its available level history. The 24-hour spot-index return was -0.18%, while Bitcoin one-week ATM IV remained 6.96 points above seven-day realised volatility at the cutoff. DerivaSys data show the repricing concentrated at the front end: front-end ATM IV gained 2.12 points, versus a 0.11-point increase in the long-end average.
Bitcoin one-week RR25 fell 0.48 volatility points to -0.37%, shifting relative volatility toward puts and leaving puts richer than calls at the cutoff. Bitcoin’s 24-hour spot-index return was -0.37%, while one-week ATM IV of 34.76% remained 3.34 points above seven-day realised volatility, according to DerivaSys data.
Bitcoin one-week ATM IV fell 2.65 volatility points to 36.34% over the observation window, even as the 24-hour spot-index return was positive 1.00%. Derivasys data show the move was notable against comparable history. One-week implied volatility nevertheless remained 5.18 points above seven-day realised volatility, while 24-hour realised volatility was higher.
Bitcoin one-month RR25 fell 0.97 volatility points to minus 0.38% over the observation window, shifting the relative price of puts above calls. The move was notable at the 81.3 percentile of comparable full-history observations. At the same cutoff, one-week ATM IV was 38.99%, down 1.48 points, while the Bitcoin spot-index return over 24 hours was minus 2.30%. DerivaSys data show a lower volatility level alongside a more defensive skew.
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.
