BTC front-end volatility rises as skew turns call-rich
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.
BTCSpot-index 24h +0.31%1W ATM IV 34.67%1W RR25 +1.13 vol pts1W BF25 +1.81 vol pts1W IV − 7D RV Unavailable
BTC1W ATM IV 34.67%Spot-index 24h +0.31%
Full snapshot readings
BTCSpot-index 24h +0.31%1W ATM IV 34.67%1W RR25 +1.13 vol pts1W BF25 +1.81 vol pts1W IV − 7D RV Unavailable
Combined market read · daily observation window
The move in context.
BTC spot-index return unavailable; 1W ATM IV rose 1.11 volatility points to 34.67% over the daily window. RR25 moved toward calls (+0.96 points); BF25 wing premium decreased (-0.08 points); partial native coverage (3/4 measurements).
One-week surface context; the published headline retains its original evidence basis. Cutoffs 30 Aug, 20:58 UTC to 31 Aug, 20:58 UTC.
Measured change since prior report
Prior comparison unavailable: the exact adjacent published edition could not be verified.
A structured watchlist was not recorded or could not be verified in the prior edition; this compares measured changes only.
Next daily cutoff: measurable checks
These checks are reconstructed from this edition’s stored endpoints; they were not recorded in the original report.
Hold the observed level: BTC 1W ATM IV ≥ 34.67 percent at . Current level 34.67; threshold is the current observed endpoint.
Full retrace: BTC 1W ATM IV ≤ 33.56 percent at . Current level 34.67; threshold is the previous observed endpoint.
Measurement basis and receipt
These are observed-level conditions for the next aligned cutoff, with no forecast or trade action. Spot uses exact index endpoints where available; ATM IV is quoted in percent and its change, RR25 and BF25 in volatility points. Derived from verified legacy artifact endpoints.
BTC:atmIv:1W:observed-current-level: rows[asset=BTC].report.tenors[tenor=1W].atmIv.previous; rows[asset=BTC].report.tenors[tenor=1W].atmIv.current; rows[asset=BTC].report.tenors[tenor=1W].atmIv.change; evaluation window 2026-08-31T20:58:00+00:00 to 2026-09-01T20:58:00+00:00.
BTC:atmIv:1W:observed-previous-level: rows[asset=BTC].report.tenors[tenor=1W].atmIv.previous; rows[asset=BTC].report.tenors[tenor=1W].atmIv.current; rows[asset=BTC].report.tenors[tenor=1W].atmIv.change; evaluation window 2026-08-31T20:58:00+00:00 to 2026-09-01T20:58:00+00:00.
01 · Daily briefing
Macro · Crypto · Options
The day in markets.
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.
BTC front end firms into cutoff
One-week ATM IV increased while two-week skew shifted toward relative call-side volatility.
Macro
Rate expectations and Iran developments were reported during the window.
Links identify the underlying reporting for retained events; entries without a retained link are marked.
02 · Options market read
What the volatility surface did.
6 of 6 headline tenors were comparable at both endpoints. The largest ATM IV move was 1W at +1.11 volatility points, to 34.67%.
Derived directly from structured Derivasys surface data
03 · Catalyst check
30 Aug 2026, 20:58 UTC to 31 Aug 2026, 20:58 UTC
Relevant context found; no confirmed catalyst
Relevant market events
2 relevant events were retained for the comparison window.
News collection was incomplete; the retained events do not establish full coverage.
Confidencelow causal confidence
News is presented as contextual association unless the structured evidence supports a stronger relationship.
04 · Detailed analysis
What changed across the BTC volatility surface.
Implied versus realised
At the 20:58 UTC cutoff, 1W ATM IV was 34.67%, 3.34 volatility points below seven-day realised volatility of 38.01%; 24-hour realised volatility was 42.01% and 30-day realised volatility was 36.11%.
Front end
Front-end ATM IV increased, averaging +0.72 volatility points to 35.01% across 1W, 2W and 1M.
Long end
Long-dated ATM IV was broadly unchanged, averaging +0.06 volatility points to 41.16% across 6M and 1Y.
Skew
RR25 moved towards calls, averaging +0.69 volatility points to 0.22 volatility points across the six available headline tenors.
Convexity
BF25 was broadly unchanged, averaging +0.02 volatility points to 2.26 volatility points across the six available headline tenors.
Largest standard-tenor move
The largest standard-tenor ATM IV move was +1.11 volatility points at 1W, to 34.67%.
Universe roll: no additions; removed 31AUG26. Comparisons use common expiries only.
RR25 moved towards calls, averaging +0.69 volatility points to 0.22 volatility points across the six available headline tenors. Negative RR25 denotes a richer 25-delta put wing under the call-minus-put convention.
BF25 was broadly unchanged, averaging +0.02 volatility points to 2.26 volatility points across the six available headline tenors. BF25 measures the average 25-delta wing premium over ATM IV.
Contracts with fewer than 2 full days to expiry remain in the tables but are excluded from headline rankings. Settlement proximity, time decay, changing liquidity and fewer quotes can exaggerate their changes.
0.5d
Smile rotation
1SEP26, -14.29 vol pts1.5d
Smile rotation
2SEP26, +3.70 vol pts
10 · Volatility term structure
Today against the previous 24-hour snapshot.
Only fixed tenors bracketed by listed expiries at both snapshots are charted. The listed-expiry table preserves the observable exchange maturities underneath those interpolated points.
CurrentComparison snapshot
Expiry
Time left
Forward now (USD)
Forward change (USD)
ATM IV now
ATM IV change
RR25 change
BF25 change
1SEP26Expiry effect
0.5 days
78,852.15
+200.29 USD
33.90%
-1.47 vol pts
-2.15 vol pts
-0.47 vol pts
2SEP26Expiry effect
1.5 days
78,859.95
+194.93 USD
33.79%
+0.44 vol pts
+0.47 vol pts
-0.19 vol pts
3SEP26
2.5 days
78,871.76
+194.48 USD
35.32%
+2.28 vol pts
+0.59 vol pts
-0.21 vol pts
4SEP26
3.5 days
78,883.8
+198.19 USD
35.75%
+2.39 vol pts
+1.00 vol pts
+0.06 vol pts
11SEP26
10.5 days
78,934.88
+206.49 USD
34.32%
+0.62 vol pts
+1.11 vol pts
-0.09 vol pts
18SEP26
17.5 days
79,002.89
+220.94 USD
35.33%
+0.32 vol pts
+1.12 vol pts
-0.04 vol pts
25SEP26
24.5 days
79,045.39
+222.25 USD
35.08%
+0.42 vol pts
+1.32 vol pts
+0.16 vol pts
30OCT26
59.5 days
79,452.31
+239.89 USD
36.07%
+0.21 vol pts
+0.43 vol pts
+0.05 vol pts
27NOV26
87.5 days
79,768.12
+229.14 USD
37.88%
+0.31 vol pts
+0.44 vol pts
-0.02 vol pts
25DEC26
115.5 days
80,096.2
+213.06 USD
38.74%
+0.18 vol pts
+0.84 vol pts
+0.06 vol pts
26MAR27
206.5 days
80,997.29
+210.38 USD
40.32%
+0.03 vol pts
+0.40 vol pts
0.00 vol pts
25JUN27
297.5 days
82,001.71
+191.10 USD
41.71%
+0.04 vol pts
+0.20 vol pts
+0.02 vol pts
11 · Smile movement
Reconstructed SVI smiles for every common expiry.
Each overlay uses the stored five-parameter SVI fit and the snapshot-specific time to expiry. Ultra-short expiries are displayed but do not determine the headline ranking.
1SEP26rotation towards puts · wing steepening2SEP26rotation towards calls · wing steepening3SEP26rotation towards calls · wing steepening4SEP26rotation towards calls · wing steepening11SEP26rotation towards calls18SEP26rotation towards calls25SEP26rotation towards calls30OCT26rotation towards calls27NOV26rotation towards calls25DEC26rotation towards calls26MAR27limited movement25JUN27limited movement
Surface movement heatmap
Each cell is the fitted IV change in volatility points. Rows are listed expiries; columns run from the put wing through ATM to the call wing.
IV lowerIV higher
1SEP26
2SEP26
3SEP26
4SEP26
11SEP26
18SEP26
25SEP26
30OCT26
27NOV26
25DEC26
26MAR27
25JUN27
-0.30kATM+0.30k
Completed-session cross-asset context
Crypto volatility against US equity risk.
BTC 30-day implied volatility was 2.5 times VIX, while its 30-session return correlation with SPX was low at 0.10.
Implied-volatility premium
BTC 30-day ATM IV was 36.73%, against VIX at 14.43: a 22.30-point spread and 2.55× ratio.
Realised-volatility regime
BTC reported crypto realised volatility was 45.92%, versus SPX reported realised volatility of 10.58%. The spread ranked at percentile rank 74.9% of 223 prior observations.
Equity co-movement
Return correlation with SPX was 0.104 over 30 aligned sessions and 0.376 over 60 sessions. VIX9D, VIX and VIX3M closed at 11.22, 14.43 and 17.48.
RV comparison basis unverified: this edition does not record the recognised provider methodology for both horizons and annualisation conventions. The displayed spread rank does not establish matched-horizon comparability.
As of 28 Aug 2026, 20:00 UTC. Implied volatility and completed-session realised volatility use their respective observation windows shown above.
Evidence and methodology
Persisted common US session. BTC realised volatility is annualised on sqrt(365); SPX realised volatility is annualised on sqrt(252). Null IV percentiles are preserved because no eligible prior observations were available.
Evidence, source data and methodology
Report comparison baseline → current snapshot
2026-08-30 20:58:00 UTC → 2026-08-31 20:58:00 UTC
Changes use these stored market-snapshot baselines. The comparison baseline may differ from the snapshot used in the previous published edition.
Original report summary
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.
At report cutoff · Levels and stored endpoint changes
What matters now
Vol: BTC 1W ATM IV 34.67% · Δ +1.11 vol pts
Skew: BTC 1W RR25 1.13 vol pts · Δ +0.96 vol pts
Wings: BTC 1W BF25 1.81 vol pts · Δ -0.08 vol pts
Vol
BTC 1W ATM IV 34.67% · Δ +1.11 vol ptspercentile rank 43.3% by absolute move · 30-day window (n=30)
Skew
BTC 1W RR25 1.13 vol pts · Δ +0.96 vol ptspercentile rank 64.3% by absolute move · full history (n=129)
These diagnostics preserve the fitted-surface audit trail without competing with the main market story.
Show SVI parameter changes and normalized Greeks
SVI diagnostics
Daily movement in a, b, rho, m and sigma.
Among ranking-eligible expiries, the largest absolute rho change occurred at 30OCT26; the largest sigma change occurred at 25DEC26.
Expiry
Δ a
Δ b
Δ rho
Δ m
Δ sigma
Smile classification
1SEP26
+0.01190
-0.02580
-0.13250
-0.07840
+0.04840
rotation towards puts, wing steepening
2SEP26
+0.00790
-0.01430
+0.07360
+0.04040
+0.00240
rotation towards calls, wing steepening
3SEP26
-0.00230
-0.00870
+0.02970
+0.01250
+0.06130
rotation towards calls, wing steepening
4SEP26
+0.00530
-0.00910
+0.02620
+0.00760
-0.00990
rotation towards calls, wing steepening
11SEP26
+0.00450
-0.00940
+0.02060
+0.00010
+0.00390
rotation towards calls
18SEP26
+0.01060
-0.01490
+0.04830
+0.02060
-0.02580
rotation towards calls
25SEP26
+0.01870
-0.01520
+0.04770
+0.02640
-0.08220
rotation towards calls
30OCT26
-0.01100
-0.00520
+0.13340
+0.06790
+0.05040
rotation towards calls
27NOV26
+0.01250
-0.02540
+0.07170
+0.06030
-0.00050
rotation towards calls
25DEC26
+0.05470
-0.01570
-0.06300
-0.04370
-0.14150
rotation towards calls
26MAR27
+0.02740
-0.00950
-0.02640
-0.03030
-0.05900
limited movement
25JUN27
+0.04700
-0.01770
-0.02330
-0.02230
-0.08340
limited movement
Current surface characteristics
Where normalized model Greek intensity is highest.
These are comparable Black-forward Greeks for a one-BTC ATM-forward call at each listed expiry—not portfolio exposure, open interest or a prediction of dealer positioning.
Thresholds are asset-specific policies recorded in this edition. Each window is assessed independently; returns spanning gaps are excluded. Partial estimates may miss volatility during gaps.
RV coverage and methodology
BTC · Unavailable · Surface cutoff 31 Aug 2026, 20:58:00 UTC · 7D coverage not recorded / not recorded required · largest 7D gap not recorded / not recorded maximum · maximum gap not recorded. RV suppressed — valid 7D coverage was not recorded. Full 7D coverage policy was not recorded.
Derivasys proprietary historical SVI surface and canonical BTC index databases
Realised volatility
Annualised root-mean-square of one-minute canonical BTC-USD index log returns using a 365-day basis; all windows end at the current snapshot.
Comparison window
Nearest successful surface snapshots approximately 24 hours apart
RR convention
25-delta call IV minus 25-delta put IV
BF convention
Average 25-delta wing IV minus ATM forward IV
Fixed tenors
Fixed-tenor measures are interpolated independently at 1W, 2W, 1M, 3M, 6M, 9M and 1Y; headline rankings prioritise 1W, 2W, 1M, 3M, 6M and 1Y.
Smile reconstruction
Listed-expiry smiles are reconstructed from stored SVI total-variance parameters on a fixed log-moneyness grid.
Ultra-short expiries
Expiries with fewer than 2 full days remaining stay in detailed tables but are excluded from headline rankings. Settlement proximity, time decay, changing liquidity and fewer quotes can exaggerate their changes.
Greek normalization
Black forward Greeks for a normalized one-BTC ATM-forward call, zero rate, fitted SVI IV
Catalyst policy
Only sufficiently relevant, reliably sourced events are shown; otherwise no catalyst is assigned.
