Daily BTC options market report · 24-hour comparison

Bitcoin options see one-week implied volatility fall 0.88 points to 31.79%

Name: BTC options surface changes for 2026-10-20
Creator: Derivasys
License: https://www.derivasys.com/research-artifact-license/v1

BTC 1W ATM IV fell 0.88 vol points to 31.79% over the daily comparison.

By Sean Gordon — Derivasys Research

Published 20 Oct 2026, 20:12 UTC · Generated 20 Oct 2026, 16:33 UTC · Snapshot 20 Oct 2026, 16:31 UTC

Snapshot · 20 Oct 2026, 16:31 UTC

Scheduled edition reference: 2026-10-20 16:31:00 UTC. Native observations below retain their actual fit times.

Report comparison baseline → current snapshot: 2026-10-19 16:31:00 UTC → 2026-10-20 16:31:00 UTC
Report native fit age at scheduled reference: 0 minutes

Changes use these stored market-snapshot baselines. The comparison baseline may differ from the snapshot used in the previous published edition.

BTCSpot-index 24h +0.73%1W ATM IV 31.79%1W RR25 -2.40 vol pts1W BF25 +1.76 vol pts1W IV − 7D RV -3.65 vol pts

BTC1W ATM IV 31.79%1W IV Δ -0.88 vol pts

Full snapshot readings

BTCSpot-index 24h +0.73%1W ATM IV 31.79%1W RR25 -2.40 vol pts1W BF25 +1.76 vol pts1W IV − 7D RV -3.65 vol pts

Lead move: BTC 1W ATM IV Δ -0.88 vol pts → 31.79% · percentile rank 43.5% by absolute move · 1-day moves · 30-day window (n=23).

Combined market read · daily observation window

The move in context.

BTC spot rose 0.73%; 1W ATM IV fell 0.88 volatility points to 31.79% over the daily window. RR25 moved toward calls (+0.97 points); BF25 wing premium increased (+0.01 points).

Uses the stored headline’s selected tenor. Cutoffs 19 Oct, 16:31 UTC to 20 Oct, 16:31 UTC.

Previous publication · research context

2026-10-19: “Bitcoin options: 1w butterfly falls 0.38 volatility points”

Previous publication cutoff 19 Oct, 16:31 UTC. Today’s market comparison starts at 19 Oct, 16:31 UTC. Snapshot clocks align for the measured comparison below.

Previous publication JSON · SHA-256 d76936d5d33c228997cf5787ec01f0591d15d5b499acdf8d8a39b4e7a76deba1

Prior watch: measured outcome

Against the 2026-10-19 daily edition.

BTC 1W ATM IV: prior change -1.86 → current change -0.88 volatility points; same direction.
BTC spot-index return: prior change +1.09 → current change +0.73 percent; same direction.
BTC 1W RR25: prior change +0.74 → current change +0.97 volatility points; same direction.
BTC 1W BF25: prior change -0.38 → current change +0.01 volatility points; direction reversed.

BTC 1W BF25 ≤ 1.75 volatility points (hold the observed endpoint) at 20 Oct, 16:31 UTC: not met (observed 1.76 volatility points).
BTC 1W BF25 ≥ 2.13 volatility points (full retrace to the prior endpoint) at 20 Oct, 16:31 UTC: not met (observed 1.76 volatility points).

Next daily cutoff: measurable checks

Hold the observed level: BTC 1W ATM IV ≤ 31.79 percent at 21 Oct, 16:31 UTC. Current level 31.79; threshold is the current observed endpoint.
Full retrace: BTC 1W ATM IV ≥ 32.67 percent at 21 Oct, 16:31 UTC. Current level 31.79; 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. Stored editorial receipt independently reconstructed against native endpoints.

Canonical current report JSON · SHA-256 9793537044c3ab47cef1da8236aa1ca27895af918d60b3dbb559f57171e46d2a

Prior artifact: /v1/btc/daily/2026-10-19/d76936d5d33c228997cf5787ec01f0591d15d5b499acdf8d8a39b4e7a76deba1.json · SHA-256 d76936d5d33c228997cf5787ec01f0591d15d5b499acdf8d8a39b4e7a76deba1

Consumed endpoint proof: 76e6d7d18e2596a768cb8d4bbcd4d0f07a41dafb03b7f0262bf2a8fa8c8ded16

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 2026-10-20T16:31:00+00:00 to 2026-10-21T16:31:00+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 2026-10-20T16:31:00+00:00 to 2026-10-21T16:31:00+00:00.

Bitcoin options see one-week implied volatility fall 0.88 points to 31.79%. ATM implied-volatility term structure from Derivasys data. — Source: Derivasys options data. ATM implied-volatility; unsupported tenors remain blank. Cite this report.

Chart download and reuse terms

Download 1280 × 720 chart · Reuse terms

Chart reading: BTC -0.88 vol points between the stored daily endpoints.
Relative-value reading: The reading measures ATM implied volatility at the chart’s stated tenor.
Combined surface read: ATM IV fell (BTC); RR25 moved toward calls (BTC); BF25 wing premium increased (BTC); 1W IV was below 7D RV (BTC).

The day in markets.

Smile rotation is the fitted IV change at +0.15 log-moneyness minus the change at −0.15, in volatility points. A positive reading indicates a relative shift toward the call side.

Tuesday 20 October

Bitcoin options see one-week implied volatility fall 0.88 points to 31.79%

The 1W ATM IV change for BTC was -0.88 volatility points over the stored comparison.

Cointelegraph reports a prospective BTC treasury transaction. This is background reporting; a direct link to the options observation is not established. Decrypt reported: “Abandoned Bitcoin? Wallet Targeted by Noah Doe Lawsuit Moves $33 Million”. This is background reporting; a direct link to the options observation is not established.

Macro

Selected canonical sources are retained below as context.

Abandoned Bitcoin? Wallet Targeted by Noah Doe Lawsuit Moves $33 MillionDecrypt · 16:46 UTC

Crypto

Metaplanet to take 93.7% stake in Super League through 2,100 BTC dealCointelegraph · 16:41 UTC

Links identify the underlying reporting for retained events; entries without a retained link are marked.

BTC volatility context · Derivasys DS30 and Bitfinex BVIV

Model-derived and market-implied volatility.

Derivasys DS30 is model-derived volatility; Bitfinex BVIV is a market-implied reference. Values and their difference are shown in volatility points.

DS30 · Derivasys model-derived

40.83 vol points

Measurement 20 Oct 2026, 16:31:00 UTC

At report cutoff · 0 min measurement lag

BVIV · Bitfinex market reference

39.50 vol points

Measurement 20 Oct 2026, 16:29:58 UTC

At report cutoff · 1 min measurement lag

Measurement age 62s · report-cutoff maximum 90s · persisted source maximum 15s · source availability: streaming · comparison eligible

BVIV minus DS30

-1.33 vol points

As of 20 Oct 2026, 16:31 UTC. Measurement freshness is shown separately for each index.

02 · Options market read

What the volatility surface did.

5 of 6 headline tenors were comparable at both endpoints. The largest ATM IV move was 1W at -0.88 volatility points, to 31.79%.

Derived directly from structured Derivasys surface data

Relevant context found; no confirmed catalyst

Relevant market events

2 relevant events were retained for the comparison window.

Confidencelow causal confidence

News is presented as contextual association unless the structured evidence supports a stronger relationship.

Selected events

01
Metaplanet to take 93.7% stake in Super League through 2,100 BTC dealCointelegraph · 16:41 UTC
broader crypto · neutral · low confidence
Selection methodology
Events are selected using relevance scoring and event-level deduplication.
Retained as contemporaneous price context alongside Forward 23OCT26: +518.06 USD (+0.63%) to 82481.79 USD; the surface data does not establish a causal relationship.
Matched signals: Forward 23OCT26: +518.06 USD (+0.63%) to 82481.79 USD
02
Abandoned Bitcoin? Wallet Targeted by Noah Doe Lawsuit Moves $33 MillionDecrypt · 16:46 UTC
broader crypto · neutral · low confidence
Selection methodology
Events are selected using relevance scoring and event-level deduplication.
Retained as contemporaneous price context alongside Forward 23OCT26: +518.06 USD (+0.63%) to 82481.79 USD; the surface data does not establish a causal relationship.
Matched signals: Forward 23OCT26: +518.06 USD (+0.63%) to 82481.79 USD

04 · Detailed analysis

What changed across the BTC volatility surface.

Implied versus realised

At the 16:31 UTC cutoff, 1W ATM IV was 31.79%, 3.65 volatility points below seven-day realised volatility of 35.44%; 24-hour realised volatility was 36.57% and 30-day realised volatility was 33.64%.

Front end

Front-end ATM IV decreased, averaging -0.35 volatility points to 34.24% across 1W, 2W and 1M.

Long end

Six-month ATM IV was broadly unchanged at 37.66% (+0.07 volatility points); 1Y was unavailable.

Skew

RR25 moved towards calls, averaging +0.31 volatility points to -2.68 volatility points across the five available headline tenors.

Convexity

BF25 was broadly unchanged, averaging -0.01 volatility points to 1.97 volatility points across the five available headline tenors.

Largest standard-tenor move

The largest standard-tenor ATM IV move was -0.88 volatility points at 1W, to 31.79%.

24h spot-index return

BTC spot-index return was +0.73% over 24 hours.

7d spot-index return

BTC spot-index return was -1.05% over seven days.

Universe roll: added 24OCT26; removed 20OCT26. Comparisons use common expiries only.

05 · Standard-tenor ranking

Largest surface events

Largest eligible smile rotation

23OCT26, +4.61 vol pts

Largest standard-tenor RR25 move

1W, +0.97 vol pts

Largest standard-tenor ATM IV move

1W, -0.88 vol pts

Largest eligible SVI rho move

27NOV26, +0.1548 param

Largest standard-tenor BF25 move

2W, -0.13 vol pts

Largest eligible SVI sigma move

30OCT26, +0.0651 param

06 · ATM volatility

Standard-tenor ATM implied volatility.

Tenor	Current (vol %)	Comparison snapshot (vol %)	Change (vol pts)	Relative change
1W	31.79	32.67	-0.88 vol pts	-2.69%
2W	35.06	35.19	-0.13 vol pts	-0.37%
1M	35.87	35.91	-0.04 vol pts	-0.11%
3M	36.70	36.63	+0.07 vol pts	+0.19%
6M	37.66	37.59	+0.07 vol pts	+0.19%
9M	38.35	38.27	+0.08 vol pts	+0.21%
1Y	Unavailable	Unavailable	Unavailable	Unavailable

Source: Derivasys Research — structured data

07 · Risk reversals

RR25 skew moved most at 1W.

RR25 moved towards calls, averaging +0.31 volatility points to -2.68 volatility points across the five available headline tenors. Negative RR25 denotes a richer 25-delta put wing under the call-minus-put convention.

Tenor	Current (vol pts)	Comparison snapshot (vol pts)	Change (vol pts)
1W	-2.40	-3.37	+0.97 vol pts
2W	-2.91	-3.84	+0.93 vol pts
1M	-3.24	-3.33	+0.09 vol pts
3M	-2.80	-2.58	-0.22 vol pts
6M	-2.04	-1.82	-0.22 vol pts
9M	-1.70	-1.64	-0.06 vol pts
1Y	Unavailable	Unavailable	Unavailable

Source: Derivasys Research — structured data

08 · Butterflies

BF25 convexity changed most at 2W.

BF25 was broadly unchanged, averaging -0.01 volatility points to 1.97 volatility points across the five available headline tenors. BF25 measures the average 25-delta wing premium over ATM IV.

Tenor	Current (vol pts)	Comparison snapshot (vol pts)	Change (vol pts)
1W	1.76	1.75	+0.01 vol pts
2W	1.75	1.88	-0.13 vol pts
1M	1.86	1.95	-0.09 vol pts
3M	2.22	2.16	+0.06 vol pts
6M	2.28	2.16	+0.12 vol pts
9M	2.24	2.14	+0.10 vol pts
1Y	Unavailable	Unavailable	Unavailable

Source: Derivasys Research — structured data

09 · Expiry effects

Near-settlement moves, shown with context.

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.

0.6d

Smile rotation

21OCT26, +16.25 vol pts

1.6d

Smile rotation

22OCT26, +6.81 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.

Suppressed outside the observable listed-expiry range: 1Y.

Expiry	Time left	Forward now (USD)	Forward change (USD)	ATM IV now	ATM IV change	RR25 change	BF25 change
21OCT26Expiry effect	0.6 days	82,441.81	+509.80 USD	26.00%	-2.07 vol pts	+2.76 vol pts	-0.20 vol pts
22OCT26Expiry effect	1.6 days	82,467.8	+517.30 USD	28.84%	-1.06 vol pts	+1.60 vol pts	-0.06 vol pts
23OCT26	2.6 days	82,481.79	+518.06 USD	29.78%	-1.12 vol pts	+1.37 vol pts	+0.23 vol pts
30OCT26	9.6 days	82,597.35	+526.21 USD	32.19%	-1.11 vol pts	+1.04 vol pts	-0.08 vol pts
6NOV26	16.6 days	82,657.84	+518.07 USD	36.01%	-0.37 vol pts	+0.97 vol pts	-0.15 vol pts
27NOV26	37.6 days	82,917.61	+507.85 USD	35.83%	+0.07 vol pts	-0.18 vol pts	-0.06 vol pts
25DEC26	65.6 days	83,280.2	+532.58 USD	36.11%	+0.05 vol pts	-0.21 vol pts	+0.03 vol pts
26MAR27	156.6 days	84,352.56	+544.22 USD	37.32%	+0.05 vol pts	-0.30 vol pts	+0.10 vol pts
25JUN27	247.6 days	85,518.1	+593.51 USD	38.21%	+0.08 vol pts	-0.07 vol pts	+0.13 vol pts
24SEP27	338.6 days	86,630.52	+608.10 USD	38.60%	+0.05 vol pts	-0.06 vol pts	+0.06 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.

21OCT26rotation towards calls · wing steepening

22OCT26rotation towards calls · wing steepening

23OCT26rotation towards calls · wing steepening

30OCT26rotation towards calls · wing steepening

6NOV26rotation towards calls

27NOV26limited movement

25DEC26limited movement

26MAR27limited movement

25JUN27parallel shift higher

24SEP27parallel shift higher

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.

21OCT26

22OCT26

23OCT26

30OCT26

6NOV26

27NOV26

25DEC26

26MAR27

25JUN27

24SEP27

-0.30kATM+0.30k

Completed-session cross-asset context

Crypto volatility against US equity risk.

BTC 30-day implied volatility was 2.0 times VIX, while its 30-session return correlation with SPX was mixed at 0.57.

Implied-volatility premium

BTC 30-day ATM IV was 36.00%, against VIX at 18.44: a 17.56-point spread and 1.95× ratio.

Daily-close realised-volatility regime

BTC reported crypto realised volatility was 20.77%, versus SPX reported realised volatility of 9.04%. The spread ranked at percentile rank 7.8% of 258 prior observations.

Equity co-movement

Return correlation with SPX was 0.568 over 30 aligned sessions and 0.343 over 60 sessions. VIX9D, VIX and VIX3M closed at 17.93, 18.44 and 19.60.

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 19 Oct 2026, 20:00 UTC. Implied volatility and completed-session realised volatility use their respective observation windows shown above.

Evidence and methodology

market-context-v1. Persisted Derivasys canonical index and 30-calendar-day fixed-tenor surface; benchmarks supplied by yahoo_finance (^GSPC, ^VIX, ^VIX9D, ^VIX3M). All reported metric observation timestamps and cryptoSnapshotTimestamp/benchmarkTimestamp: 2026-10-19T20:00:00Z. IngestedAt: 2026-10-19T22:30:51.494556Z. Quality valid; freshness fresh, ageSeconds 73860 evaluatedAt 2026-10-20T16:31:00Z. Alignment tolerance 600 seconds. IV and RV levels/spreads use volatility_points; ratios use ratio; correlations use correlation_coefficient; percentiles use percentile_rank. Crypto RV: 20 calendar-day close-to-close log returns, sqrt(365); SPX RV: 20 US trading-session log returns, sqrt(252); mixed clocks remain explicit. Correlations use 30/60 aligned US-session daily returns. Returned IV-spread and IV-ratio percentiles are null, each with sampleCount 34; benchmark VIX-family realised-volatility readings are null. Other returned diagnostics: ivSpreadChange1d 1.3599992370605491; ivRatioChange1d 0.14187237739501501; rvSpreadChange1d 0.7888157250058221; rvRatioChange1d 0.2506272382283954; returnCorrelation30Percentile 59.307359307359306 (231 observations); returnCorrelation60Percentile 8.771929824561404 (171 observations).

Index evidence and methodology

DS30 · Source measurement 20 Oct 2026, 16:31:00 UTC; observed receipt not recorded; ingested not recorded. Freshness: At report cutoff, evaluated 20 Oct 2026, 16:31:00 UTC. Measurement age 0s · report-cutoff maximum 120s · comparison eligible. Derivasys model-free 30-calendar-day implied volatility from fitted BTC SVI slices

BVIV · Source measurement 20 Oct 2026, 16:29:58 UTC; observed receipt 20 Oct 2026, 16:30:00 UTC; ingested 20 Oct 2026, 16:30:00 UTC. Freshness: At report cutoff, evaluated 20 Oct 2026, 16:31:00 UTC. Measurement age 62s · report-cutoff maximum 90s · persisted source maximum 15s · source availability: streaming · comparison eligible. Bitfinex BVIV reference price from the status channel

BVIV minus independently selected latest eligible DS30 at or before the requested cutoff

Source index JSON

RV observation windows and sampling

The 24-hour, seven-day and 30-day RV windows are assessed independently using observed one-minute index returns, annualised on a 365-day basis. Recorded minimums: at least 98% coverage over 24 hours, 97% coverage over seven days, 99.5% coverage over 30 days, with no gap longer than 60 minutes. Returns spanning gaps are excluded, not interpolated; unavailable windows remain unreported. The exact 24-hour spot return requires prices at both endpoints.

Evidence, source data and methodology

Scheduled edition reference: 2026-10-20 16:31:00 UTC. Native observations below retain their actual fit times.

Report comparison baseline → current snapshot: 2026-10-19 16:31:00 UTC → 2026-10-20 16:31:00 UTC
Report native fit age at scheduled reference: 0 minutes

Changes use these stored market-snapshot baselines. The comparison baseline may differ from the snapshot used in the previous published edition.

Lead signal · 20 Oct 2026, 16:31 UTC

The measurement behind the lead chart

BTC 1W ATM IV 31.79% · Δ -0.88 vol pts

BTC percentile rank 43.5% by absolute move · 30-day window (n=23); 1-day moves sampled daily UTC; 2026-09-19 to 2026-10-19

Original report summary

BTC 1W ATM IV is 31.79 percent, compared with 32.67 percent at the prior cutoff. The diary separates sourced context from measured market changes; the timing of an event alone does not establish a causal link.

At report cutoff · Levels and stored endpoint changes

What matters now

Vol: BTC 1W ATM IV 31.79% · Δ -0.88 vol pts

Skew: BTC 1W RR25 -2.40 vol pts · Δ +0.97 vol pts

Relative value: BTC 1W IV 31.79% / 7D RV 35.44% · spread -3.65 vol pts

Vol

BTC 1W ATM IV 31.79% · Δ -0.88 vol ptspercentile rank 43.5% by absolute move · 30-day window (n=23); 1-day moves sampled daily UTC; 2026-09-19 to 2026-10-19

Skew

BTC 1W RR25 -2.40 vol pts · Δ +0.97 vol ptspercentile rank 69.6% by absolute move · 30-day window (n=23); 1-day moves sampled daily UTC; 2026-09-19 to 2026-10-19

Wings

BTC 1W BF25 1.76 vol pts · Δ +0.01 vol ptspercentile rank 0.0% by absolute move · full history (n=44); 1-day moves sampled daily UTC; 2026-08-29 to 2026-10-19

IV versus RV

BTC 1W IV 31.79% / 7D RV 35.44% · spread -3.65 vol pts

Δ compares the report’s stored surface endpoints. IV versus RV is a level comparison, not a daily change.

Historical move evidence

BTC 1W ATM IV: percentile rank 43.5% by absolute move · 30-day window (n=23); 1-day moves sampled daily UTC; 2026-09-19 to 2026-10-19

BTC 1W RR25: percentile rank 69.6% by absolute move · 30-day window (n=23); 1-day moves sampled daily UTC; 2026-09-19 to 2026-10-19

BTC 1W BF25: percentile rank 0.0% by absolute move · full history (n=44); 1-day moves sampled daily UTC; 2026-08-29 to 2026-10-19

Technical appendix: measurement and history provenance

Download the full canonical report and evidence receipts (JSON). Artifact SHA-256: 9793537044c3ab47cef1da8236aa1ca27895af918d60b3dbb559f57171e46d2a.

Bitcoin options see one-week implied volatility fall 0.88 points to 31.79% Quiet describes only daily options-surface movements under the stored operational policy; it makes no weekly stabilization claim.

Percentile sample windows, horizons and receipts

Samples use daily UTC observations. Weekly moves can be rolling and overlapping; observation counts do not imply independent periods. Missing legacy bounds and source revisions remain unavailable.

Frozen percentile denominators
Asset / tenor / metric	Cohort	Count / horizon	Actual bounds	Overlap / provenance
BTC 1W atmIv	move30d	23 samples; 1 days; daily UTC observations	2026-09-19 → 2026-10-19 2026-09-19T16:31:00+00:00 → 2026-10-19T16:31:00+00:00	No period overlap in this cohort; source revision unknown; `sha256:1976f9232ccf3aac30475816011dfd3256408f7aff155ab5f8a8fd8bda76436f`
BTC 1W atmIv	moveFullHistory	44 samples; 1 days; daily UTC observations	2026-08-29 → 2026-10-19 2026-08-29T16:31:00+00:00 → 2026-10-19T16:31:00+00:00	No period overlap in this cohort; source revision unknown; `sha256:1cd6e5a37d4a72d44d62ed15db1d2fd8496fe5977246437533fb03c67dc386e9`
BTC 1W atmIv	levelFullHistory	48 samples; 0 days; daily UTC observations	2026-08-29 → 2026-10-19 2026-08-29T16:31:00+00:00 → 2026-10-19T16:31:00+00:00	No period overlap in this cohort; source revision unknown; `sha256:4f82f7f06ffe4a0cb6b72e1fc30fcef5b9ce815117e0a291f0264d7d0ef41c76`
BTC 1W bf25	move30d	23 samples; 1 days; daily UTC observations	2026-09-19 → 2026-10-19 2026-09-19T16:31:00+00:00 → 2026-10-19T16:31:00+00:00	No period overlap in this cohort; source revision unknown; `sha256:68491b523683eaf37393f878ee78fe5f866777a6854d7ef7b0b80188c0ace7bd`
BTC 1W bf25	moveFullHistory	44 samples; 1 days; daily UTC observations	2026-08-29 → 2026-10-19 2026-08-29T16:31:00+00:00 → 2026-10-19T16:31:00+00:00	No period overlap in this cohort; source revision unknown; `sha256:b113f493a2108ba3f3db15a0a2cf837056ae7584bfc4f3348e876671fb93d315`
BTC 1W bf25	levelFullHistory	48 samples; 0 days; daily UTC observations	2026-08-29 → 2026-10-19 2026-08-29T16:31:00+00:00 → 2026-10-19T16:31:00+00:00	No period overlap in this cohort; source revision unknown; `sha256:762aa83aa5c19f6a10440958369e1be16b5fdb2ead517b5ac6fe57150446f1c2`
BTC 1W rr25	move30d	23 samples; 1 days; daily UTC observations	2026-09-19 → 2026-10-19 2026-09-19T16:31:00+00:00 → 2026-10-19T16:31:00+00:00	No period overlap in this cohort; source revision unknown; `sha256:5e18ee096b64a95665b8b812e0f8db494a3cfd379a3b6f290830d0eb2d6e76d0`
BTC 1W rr25	moveFullHistory	44 samples; 1 days; daily UTC observations	2026-08-29 → 2026-10-19 2026-08-29T16:31:00+00:00 → 2026-10-19T16:31:00+00:00	No period overlap in this cohort; source revision unknown; `sha256:b4bf56ff0218c769d8fba6eb3dd29350368b961db01ce4b5122a03ca5aed20d1`
BTC 1W rr25	levelFullHistory	48 samples; 0 days; daily UTC observations	2026-08-29 → 2026-10-19 2026-08-29T16:31:00+00:00 → 2026-10-19T16:31:00+00:00	No period overlap in this cohort; source revision unknown; `sha256:e550ff66927b973dafcd6ce9211c844e7421447b9fbf4d5a47bd719f52bb8833`
BTC 2W atmIv	move30d	23 samples; 1 days; daily UTC observations	2026-09-19 → 2026-10-19 2026-09-19T16:31:00+00:00 → 2026-10-19T16:31:00+00:00	No period overlap in this cohort; source revision unknown; `sha256:8210856b65b51392317f3bb30300a68bfad4d86e232eb2d98553f872f985396c`
BTC 2W atmIv	moveFullHistory	44 samples; 1 days; daily UTC observations	2026-08-29 → 2026-10-19 2026-08-29T16:31:00+00:00 → 2026-10-19T16:31:00+00:00	No period overlap in this cohort; source revision unknown; `sha256:bc7b0dbfa374aab2e2f1ee68a710fbc8a4b2c05d0de4e7d456aa2c40b9050f18`
BTC 2W atmIv	levelFullHistory	48 samples; 0 days; daily UTC observations	2026-08-29 → 2026-10-19 2026-08-29T16:31:00+00:00 → 2026-10-19T16:31:00+00:00	No period overlap in this cohort; source revision unknown; `sha256:3f68a13e00d20d2f4945624737a7f0ed046e5148242dbf13eae4cae011a34b30`
BTC 2W bf25	move30d	23 samples; 1 days; daily UTC observations	2026-09-19 → 2026-10-19 2026-09-19T16:31:00+00:00 → 2026-10-19T16:31:00+00:00	No period overlap in this cohort; source revision unknown; `sha256:6b71243eae2d9460125b2ba2e7b0fe6f65e3942e63ca5ecf42516278d2b9642b`
BTC 2W bf25	moveFullHistory	44 samples; 1 days; daily UTC observations	2026-08-29 → 2026-10-19 2026-08-29T16:31:00+00:00 → 2026-10-19T16:31:00+00:00	No period overlap in this cohort; source revision unknown; `sha256:f69b1c197a6ce93deb8afc992965d1817ec87a48417b0633b06a5e9e3a9eef92`
BTC 2W bf25	levelFullHistory	48 samples; 0 days; daily UTC observations	2026-08-29 → 2026-10-19 2026-08-29T16:31:00+00:00 → 2026-10-19T16:31:00+00:00	No period overlap in this cohort; source revision unknown; `sha256:c09cf9e7bec2d9c77bbb36b6eb7b2b07d2112ada2a6629c18099d1e5f82f0910`
BTC 2W rr25	move30d	23 samples; 1 days; daily UTC observations	2026-09-19 → 2026-10-19 2026-09-19T16:31:00+00:00 → 2026-10-19T16:31:00+00:00	No period overlap in this cohort; source revision unknown; `sha256:33db864023d43768e1bac024144f141b718164e56662f14447e9bce380ee1b4a`
BTC 2W rr25	moveFullHistory	44 samples; 1 days; daily UTC observations	2026-08-29 → 2026-10-19 2026-08-29T16:31:00+00:00 → 2026-10-19T16:31:00+00:00	No period overlap in this cohort; source revision unknown; `sha256:34874dc8c9b28f0d25ab90dfe1af502db45f8ec864b9f3e1ace269981c605c4c`
BTC 2W rr25	levelFullHistory	48 samples; 0 days; daily UTC observations	2026-08-29 → 2026-10-19 2026-08-29T16:31:00+00:00 → 2026-10-19T16:31:00+00:00	No period overlap in this cohort; source revision unknown; `sha256:69f1d6e48a3742c2116098553705befd2b8c6c05e777214158eb24f3ebea7f82`
BTC 1M atmIv	move30d	23 samples; 1 days; daily UTC observations	2026-09-19 → 2026-10-19 2026-09-19T16:31:00+00:00 → 2026-10-19T16:31:00+00:00	No period overlap in this cohort; source revision unknown; `sha256:6d5d1f0a3ee9c7bd8fb4c2082802dbcf9c7a0e1975a6b27c1b0ddb283b5553c7`
BTC 1M atmIv	moveFullHistory	44 samples; 1 days; daily UTC observations	2026-08-29 → 2026-10-19 2026-08-29T16:31:00+00:00 → 2026-10-19T16:31:00+00:00	No period overlap in this cohort; source revision unknown; `sha256:b5f896ec4a40c3e772ec4e6e812766991bf602d3b027e848f9b51f3d4bf3bf70`
BTC 1M atmIv	levelFullHistory	48 samples; 0 days; daily UTC observations	2026-08-29 → 2026-10-19 2026-08-29T16:31:00+00:00 → 2026-10-19T16:31:00+00:00	No period overlap in this cohort; source revision unknown; `sha256:acfbb318e45da15fd61c033adf67c262642889d80328c72538ab4023b9904d57`
BTC 1M bf25	move30d	23 samples; 1 days; daily UTC observations	2026-09-19 → 2026-10-19 2026-09-19T16:31:00+00:00 → 2026-10-19T16:31:00+00:00	No period overlap in this cohort; source revision unknown; `sha256:80f3fed6a4c72a9c26f112ab1461696d6553919ba5f30b239ffee78de5e63ac8`
BTC 1M bf25	moveFullHistory	44 samples; 1 days; daily UTC observations	2026-08-29 → 2026-10-19 2026-08-29T16:31:00+00:00 → 2026-10-19T16:31:00+00:00	No period overlap in this cohort; source revision unknown; `sha256:4158682a11fd4bf59fc1353230b034f24b037960e72f3e2101ae6f1d5e8dacf5`
BTC 1M bf25	levelFullHistory	48 samples; 0 days; daily UTC observations	2026-08-29 → 2026-10-19 2026-08-29T16:31:00+00:00 → 2026-10-19T16:31:00+00:00	No period overlap in this cohort; source revision unknown; `sha256:cb7db5518d229077afbfa8719bfdccfe2126c1e1f61c418e63a1f36f1f94c905`
BTC 1M rr25	move30d	23 samples; 1 days; daily UTC observations	2026-09-19 → 2026-10-19 2026-09-19T16:31:00+00:00 → 2026-10-19T16:31:00+00:00	No period overlap in this cohort; source revision unknown; `sha256:ad59d4a7391cc5c4d706d56696ada1ae882359f95cbdf010a5e0541dd6117ed6`
BTC 1M rr25	moveFullHistory	44 samples; 1 days; daily UTC observations	2026-08-29 → 2026-10-19 2026-08-29T16:31:00+00:00 → 2026-10-19T16:31:00+00:00	No period overlap in this cohort; source revision unknown; `sha256:1e48dd83b8b058c9f552d588a2692cf46c75bffae1671bcad2142cc32d47f065`
BTC 1M rr25	levelFullHistory	48 samples; 0 days; daily UTC observations	2026-08-29 → 2026-10-19 2026-08-29T16:31:00+00:00 → 2026-10-19T16:31:00+00:00	No period overlap in this cohort; source revision unknown; `sha256:f2f9ef78b18f0674a2b03ae76d5773435b7a792702505b0584b7ef25bc105c5f`
BTC 3M atmIv	move30d	23 samples; 1 days; daily UTC observations	2026-09-19 → 2026-10-19 2026-09-19T16:31:00+00:00 → 2026-10-19T16:31:00+00:00	No period overlap in this cohort; source revision unknown; `sha256:49bbc5aa70218d43964da119e4dcb28e2191d736ae93dbb950a6cadf0e9c7355`
BTC 3M atmIv	moveFullHistory	44 samples; 1 days; daily UTC observations	2026-08-29 → 2026-10-19 2026-08-29T16:31:00+00:00 → 2026-10-19T16:31:00+00:00	No period overlap in this cohort; source revision unknown; `sha256:baa1550fc4e2910d9ca86d12c2b2b4a2220ed6fe1ea6db27cc16473fb8732990`
BTC 3M atmIv	levelFullHistory	48 samples; 0 days; daily UTC observations	2026-08-29 → 2026-10-19 2026-08-29T16:31:00+00:00 → 2026-10-19T16:31:00+00:00	No period overlap in this cohort; source revision unknown; `sha256:7f46e4d4aef6a624b81c1e0da08fbea134b86027c89919583f1aee120e0d6a5f`
BTC 3M bf25	move30d	23 samples; 1 days; daily UTC observations	2026-09-19 → 2026-10-19 2026-09-19T16:31:00+00:00 → 2026-10-19T16:31:00+00:00	No period overlap in this cohort; source revision unknown; `sha256:5cd62e9147cc4e3096acba224c5cfcb9e1776f9ce25232ef0159f07c48211f6d`
BTC 3M bf25	moveFullHistory	44 samples; 1 days; daily UTC observations	2026-08-29 → 2026-10-19 2026-08-29T16:31:00+00:00 → 2026-10-19T16:31:00+00:00	No period overlap in this cohort; source revision unknown; `sha256:e52a7957497e9e2cb6df2c79604c28444ea81259ce15d350fb6f1c714327cd13`
BTC 3M bf25	levelFullHistory	48 samples; 0 days; daily UTC observations	2026-08-29 → 2026-10-19 2026-08-29T16:31:00+00:00 → 2026-10-19T16:31:00+00:00	No period overlap in this cohort; source revision unknown; `sha256:58c13bbf17106e4ba2af867817b9d12c54170a75ed7b87a991928a7e33c5d082`
BTC 3M rr25	move30d	23 samples; 1 days; daily UTC observations	2026-09-19 → 2026-10-19 2026-09-19T16:31:00+00:00 → 2026-10-19T16:31:00+00:00	No period overlap in this cohort; source revision unknown; `sha256:f4757c017b4b1943cc0089b0eee5f5b1c10a5882bc8899d402f9362607fad2d1`
BTC 3M rr25	moveFullHistory	44 samples; 1 days; daily UTC observations	2026-08-29 → 2026-10-19 2026-08-29T16:31:00+00:00 → 2026-10-19T16:31:00+00:00	No period overlap in this cohort; source revision unknown; `sha256:9f14d0ad254c1365ead509475ac8b74445c2472db5b594e253cf2c86ea866d4f`
BTC 3M rr25	levelFullHistory	48 samples; 0 days; daily UTC observations	2026-08-29 → 2026-10-19 2026-08-29T16:31:00+00:00 → 2026-10-19T16:31:00+00:00	No period overlap in this cohort; source revision unknown; `sha256:e1dad0f4e927e8cff92702ae8739d5807f32d968296db63b7ecb4466ed7bc331`
BTC 6M atmIv	move30d	23 samples; 1 days; daily UTC observations	2026-09-19 → 2026-10-19 2026-09-19T16:31:00+00:00 → 2026-10-19T16:31:00+00:00	No period overlap in this cohort; source revision unknown; `sha256:604aad8519645bfa2675a0ee2c341827403e9e1b9ae4566c88fe99964f8dba88`
BTC 6M atmIv	moveFullHistory	44 samples; 1 days; daily UTC observations	2026-08-29 → 2026-10-19 2026-08-29T16:31:00+00:00 → 2026-10-19T16:31:00+00:00	No period overlap in this cohort; source revision unknown; `sha256:cd9969128e6db3b340a999ca24619653ad6361e437e2b1f0bdf6cdaf05227bfe`
BTC 6M atmIv	levelFullHistory	48 samples; 0 days; daily UTC observations	2026-08-29 → 2026-10-19 2026-08-29T16:31:00+00:00 → 2026-10-19T16:31:00+00:00	No period overlap in this cohort; source revision unknown; `sha256:70e904fbeff5ebf1f9174c69c89d1b7bbb8fab6cd4ea54700bc2b6ce529b05cb`
BTC 6M bf25	move30d	23 samples; 1 days; daily UTC observations	2026-09-19 → 2026-10-19 2026-09-19T16:31:00+00:00 → 2026-10-19T16:31:00+00:00	No period overlap in this cohort; source revision unknown; `sha256:99c3ff0f7f3041e0933951b9d57d5aa8ba5a9e1c178000e4f00f8a22ea90a04f`
BTC 6M bf25	moveFullHistory	44 samples; 1 days; daily UTC observations	2026-08-29 → 2026-10-19 2026-08-29T16:31:00+00:00 → 2026-10-19T16:31:00+00:00	No period overlap in this cohort; source revision unknown; `sha256:bb641c8002d708bf3e6d618f467081e3b8702b4dfd4d8a6747dc8fea41741832`
BTC 6M bf25	levelFullHistory	48 samples; 0 days; daily UTC observations	2026-08-29 → 2026-10-19 2026-08-29T16:31:00+00:00 → 2026-10-19T16:31:00+00:00	No period overlap in this cohort; source revision unknown; `sha256:ef7006bae1446411b01814dc7b118d8ccbfb343bcf5332d73279824cd9677c0d`
BTC 6M rr25	move30d	23 samples; 1 days; daily UTC observations	2026-09-19 → 2026-10-19 2026-09-19T16:31:00+00:00 → 2026-10-19T16:31:00+00:00	No period overlap in this cohort; source revision unknown; `sha256:5fbe980ea43334e9021110bf349444630a3119a024f65153a4418fb1e45d6bbf`
BTC 6M rr25	moveFullHistory	44 samples; 1 days; daily UTC observations	2026-08-29 → 2026-10-19 2026-08-29T16:31:00+00:00 → 2026-10-19T16:31:00+00:00	No period overlap in this cohort; source revision unknown; `sha256:9323f830e57d83596cf289c43853d1bf4f51b0a2313806e77993f2fe1792a289`
BTC 6M rr25	levelFullHistory	48 samples; 0 days; daily UTC observations	2026-08-29 → 2026-10-19 2026-08-29T16:31:00+00:00 → 2026-10-19T16:31:00+00:00	No period overlap in this cohort; source revision unknown; `sha256:489eaa1a01328d8a2159df80cdedf1c2226a16cf4b953d879df5a56e7a8bfa9e`
BTC 9M atmIv	move30d	23 samples; 1 days; daily UTC observations	2026-09-19 → 2026-10-19 2026-09-19T16:31:00+00:00 → 2026-10-19T16:31:00+00:00	No period overlap in this cohort; source revision unknown; `sha256:03c2deb096e1b85b9b171a71a4338c4ad4ae203802d7ce037bbd873e6b705afc`
BTC 9M atmIv	moveFullHistory	44 samples; 1 days; daily UTC observations	2026-08-29 → 2026-10-19 2026-08-29T16:31:00+00:00 → 2026-10-19T16:31:00+00:00	No period overlap in this cohort; source revision unknown; `sha256:0d5ed14bc61718d327c67a0136aa10552606fd865df8fddc988104d0f3870a9d`
BTC 9M atmIv	levelFullHistory	48 samples; 0 days; daily UTC observations	2026-08-29 → 2026-10-19 2026-08-29T16:31:00+00:00 → 2026-10-19T16:31:00+00:00	No period overlap in this cohort; source revision unknown; `sha256:9ccc60591f01b901ec8a9145dfb2417c604ce15f0dd853606aaf95ade588414f`
BTC 9M bf25	move30d	23 samples; 1 days; daily UTC observations	2026-09-19 → 2026-10-19 2026-09-19T16:31:00+00:00 → 2026-10-19T16:31:00+00:00	No period overlap in this cohort; source revision unknown; `sha256:97bdadd8caea223549806ca092963df50c574546bd2c728c0e3df56df927af27`
BTC 9M bf25	moveFullHistory	44 samples; 1 days; daily UTC observations	2026-08-29 → 2026-10-19 2026-08-29T16:31:00+00:00 → 2026-10-19T16:31:00+00:00	No period overlap in this cohort; source revision unknown; `sha256:4cda7d95b310b60c8ed3e47433b08beef5501ecf3b5490042601fecdb84069a8`
BTC 9M bf25	levelFullHistory	48 samples; 0 days; daily UTC observations	2026-08-29 → 2026-10-19 2026-08-29T16:31:00+00:00 → 2026-10-19T16:31:00+00:00	No period overlap in this cohort; source revision unknown; `sha256:ae7de6605262c732ba19b9b3cf1eacb73c3fc57ca6be89036ef05497e4178411`
BTC 9M rr25	move30d	23 samples; 1 days; daily UTC observations	2026-09-19 → 2026-10-19 2026-09-19T16:31:00+00:00 → 2026-10-19T16:31:00+00:00	No period overlap in this cohort; source revision unknown; `sha256:df9aa2b6ddf675ba4d9b66a7f7817b0edf0fd3f2fab60ac8b4ee0e277c92fb75`
BTC 9M rr25	moveFullHistory	44 samples; 1 days; daily UTC observations	2026-08-29 → 2026-10-19 2026-08-29T16:31:00+00:00 → 2026-10-19T16:31:00+00:00	No period overlap in this cohort; source revision unknown; `sha256:b37bd71a1678be20a428f1ff58efb61a7c9fab329598cb1c173243e2e95ff214`
BTC 9M rr25	levelFullHistory	48 samples; 0 days; daily UTC observations	2026-08-29 → 2026-10-19 2026-08-29T16:31:00+00:00 → 2026-10-19T16:31:00+00:00	No period overlap in this cohort; source revision unknown; `sha256:ddcbdcb408648775bc3ed4584e320fadcb6011c19c70d0a176a00f852a628873`
BTC 1Y atmIv	move30d	0 samples; 1 days; daily UTC observations	Unavailable → Unavailable Exact start unavailable → Exact end unavailable	No period overlap in this cohort; source revision unknown; `sha256:4f53cda18c2baa0c0354bb5f9a3ecbe5ed12ab4d8e11ba873c2f11161202b945`
BTC 1Y atmIv	moveFullHistory	0 samples; 1 days; daily UTC observations	Unavailable → Unavailable Exact start unavailable → Exact end unavailable	No period overlap in this cohort; source revision unknown; `sha256:4f53cda18c2baa0c0354bb5f9a3ecbe5ed12ab4d8e11ba873c2f11161202b945`
BTC 1Y atmIv	levelFullHistory	0 samples; 0 days; daily UTC observations	Unavailable → Unavailable Exact start unavailable → Exact end unavailable	No period overlap in this cohort; source revision unknown; `sha256:4f53cda18c2baa0c0354bb5f9a3ecbe5ed12ab4d8e11ba873c2f11161202b945`
BTC 1Y bf25	move30d	0 samples; 1 days; daily UTC observations	Unavailable → Unavailable Exact start unavailable → Exact end unavailable	No period overlap in this cohort; source revision unknown; `sha256:4f53cda18c2baa0c0354bb5f9a3ecbe5ed12ab4d8e11ba873c2f11161202b945`
BTC 1Y bf25	moveFullHistory	0 samples; 1 days; daily UTC observations	Unavailable → Unavailable Exact start unavailable → Exact end unavailable	No period overlap in this cohort; source revision unknown; `sha256:4f53cda18c2baa0c0354bb5f9a3ecbe5ed12ab4d8e11ba873c2f11161202b945`
BTC 1Y bf25	levelFullHistory	0 samples; 0 days; daily UTC observations	Unavailable → Unavailable Exact start unavailable → Exact end unavailable	No period overlap in this cohort; source revision unknown; `sha256:4f53cda18c2baa0c0354bb5f9a3ecbe5ed12ab4d8e11ba873c2f11161202b945`
BTC 1Y rr25	move30d	0 samples; 1 days; daily UTC observations	Unavailable → Unavailable Exact start unavailable → Exact end unavailable	No period overlap in this cohort; source revision unknown; `sha256:4f53cda18c2baa0c0354bb5f9a3ecbe5ed12ab4d8e11ba873c2f11161202b945`
BTC 1Y rr25	moveFullHistory	0 samples; 1 days; daily UTC observations	Unavailable → Unavailable Exact start unavailable → Exact end unavailable	No period overlap in this cohort; source revision unknown; `sha256:4f53cda18c2baa0c0354bb5f9a3ecbe5ed12ab4d8e11ba873c2f11161202b945`
BTC 1Y rr25	levelFullHistory	0 samples; 0 days; daily UTC observations	Unavailable → Unavailable Exact start unavailable → Exact end unavailable	No period overlap in this cohort; source revision unknown; `sha256:4f53cda18c2baa0c0354bb5f9a3ecbe5ed12ab4d8e11ba873c2f11161202b945`

12 · Technical appendix

Model parameters and normalized Greeks.

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 27NOV26; the largest sigma change occurred at 30OCT26.

Expiry	Δ a	Δ b	Δ rho	Δ m	Δ sigma	Smile classification
21OCT26	+0.01640	-0.02310	+0.18090	+0.07060	-0.09200	rotation towards calls, wing steepening
22OCT26	+0.01280	-0.01350	+0.06280	+0.02300	-0.07980	rotation towards calls, wing steepening
23OCT26	+0.00220	+0.00730	-0.01390	-0.01560	-0.05530	rotation towards calls, wing steepening
30OCT26	-0.01570	+0.01320	-0.03690	-0.02660	+0.06510	rotation towards calls, wing steepening
6NOV26	-0.00910	-0.00050	+0.04430	+0.01430	+0.04690	rotation towards calls
27NOV26	+0.01940	-0.03700	+0.15480	+0.15740	-0.00210	limited movement
25DEC26	+0.02710	-0.01620	+0.03150	+0.04840	-0.05670	limited movement
26MAR27	+0.00790	-0.01170	+0.09290	+0.12270	-0.01640	limited movement
25JUN27	-0.02510	+0.01660	+0.02350	+0.02300	+0.01730	parallel shift higher
24SEP27	+0.02350	+0.00050	-0.04430	-0.04120	-0.06390	parallel shift higher

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.

Highest Gamma21OCT26, 0.000443 1 / USD

Highest Theta Decay21OCT26, -278.621739 USD / day

Highest Vanna24SEP27, 0.001888 delta / vol pt

Highest Vega24SEP27, 327.19187 USD / vol pt

Highest Volga24SEP27, -0.292942 USD / vol pt²

7D realised volatility · data quality

Asset	Recorded RV	Status	Coverage / required	Longest gap / maximum
BTC	35.44%	Available	100% / 97% required	0 min / 60 min maximum

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 · Available · Surface cutoff 20 Oct 2026, 16:31:00 UTC · 7D coverage 100% / 97% required · largest 7D gap 0 min / 60 min maximum · maximum gap 60 min.

24h: complete; 1440/1440 observed returns; 100% coverage; 98% minimum; 0 min largest gap.

30d: complete; 43200/43200 observed returns; 100% coverage; 99.5% minimum; 0 min largest gap.

7d: complete; 10080/10080 observed returns; 100% coverage; 97% minimum; 0 min largest gap.

Source data JSON

13 · Methodology and provenance

Generated from measured Derivasys surface data.

Current snapshot: 20 Oct 2026, 16:31 UTC
Comparison snapshot: 19 Oct 2026, 16:31 UTC
Source: 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 published only when listed expiries bracket the target at both comparison snapshots. Targets outside either observable range are suppressed, not extrapolated; headline rankings use only supported tenors.
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.

Continue through Derivasys

From today’s report to the underlying methods.

Live dashboard All reports Daily metrics data Latest BTC daily Latest weekly API Volatility surface guide What is SVI? Risk reversals Butterflies Local volatility Variance swaps

The move in context.

Previous publication · research context

Prior watch: measured outcome

Next daily cutoff: measurable checks

The day in markets.

Macro

Crypto

Model-derived and market-implied volatility.

What the volatility surface did.

Relevant market events

What changed across the BTC volatility surface.

Largest surface events

Standard-tenor ATM implied volatility.

RR25 skew moved most at 1W.

BF25 convexity changed most at 2W.

Near-settlement moves, shown with context.

Today against the previous 24-hour snapshot.

Reconstructed SVI smiles for every common expiry.

Surface movement heatmap

Crypto volatility against US equity risk.

The measurement behind the lead chart

What matters now

Vol

Skew

Wings

IV versus RV

Model parameters and normalized Greeks.

Daily movement in a, b, rho, m and sigma.

Where normalized model Greek intensity is highest.

7D realised volatility · data quality

Generated from measured Derivasys surface data.

From today’s report to the underlying methods.

Get reports by email