{"schemaVersion":1,"asset":"BTC","reportDate":"2026-09-30","timestamps":{"currentSnapshotAt":"2026-09-30T16:30:00+00:00","previousSnapshotAt":"2026-09-29T16:30:00+00:00","generatedAt":"2026-09-30T16:30:44+00:00"},"comparison":{"status":"available","note":null},"provenance":{"reportArtifact":"published daily report","sourceReport":"BTC","sourceReportHref":"/reports/2026-09-30","source":"Derivasys proprietary historical SVI surface and canonical BTC index databases","comparison":"Nearest successful surface snapshots approximately 24 hours apart","rrConvention":"25-delta call IV minus 25-delta put IV","bfConvention":"Average 25-delta wing IV minus ATM forward IV","fixedTenors":"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.","realisedVolatility":"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."},"tenors":[{"tenor":"1W","targetExpiry":1791390600290,"availability":"available","unavailableReason":null,"atmIv":{"current":30.86,"previous":33.16,"change":-2.3,"percentChange":-6.94},"rr25":{"current":-0.75,"previous":-0.4,"change":-0.35,"percentChange":-87.5},"bf25":{"current":1.85,"previous":1.5,"change":0.35,"percentChange":23.33}},{"tenor":"2W","targetExpiry":1791995400290,"availability":"available","unavailableReason":null,"atmIv":{"current":32.41,"previous":33.47,"change":-1.06,"percentChange":-3.17},"rr25":{"current":-0.54,"previous":-0.66,"change":0.12,"percentChange":18.18},"bf25":{"current":1.94,"previous":1.5,"change":0.44,"percentChange":29.33}},{"tenor":"1M","targetExpiry":1793377800290,"availability":"available","unavailableReason":null,"atmIv":{"current":33.44,"previous":34.55,"change":-1.11,"percentChange":-3.21},"rr25":{"current":-1,"previous":-0.56,"change":-0.44,"percentChange":-78.57},"bf25":{"current":2.12,"previous":1.78,"change":0.34,"percentChange":19.1}},{"tenor":"3M","targetExpiry":1798648200290,"availability":"available","unavailableReason":null,"atmIv":{"current":36.76,"previous":37.28,"change":-0.52,"percentChange":-1.39},"rr25":{"current":-0.69,"previous":-0.55,"change":-0.14,"percentChange":-25.45},"bf25":{"current":2.09,"previous":2.01,"change":0.08,"percentChange":3.98}},{"tenor":"6M","targetExpiry":1806510600290,"availability":"available","unavailableReason":null,"atmIv":{"current":37.72,"previous":38.06,"change":-0.34,"percentChange":-0.89},"rr25":{"current":-0.46,"previous":-0.21,"change":-0.25,"percentChange":-119.05},"bf25":{"current":2.22,"previous":2.17,"change":0.05,"percentChange":2.3}},{"tenor":"9M","targetExpiry":1814373000290,"availability":"available","unavailableReason":null,"atmIv":{"current":38.54,"previous":38.76,"change":-0.22,"percentChange":-0.57},"rr25":{"current":-0.18,"previous":-0.09,"change":-0.09,"percentChange":-100},"bf25":{"current":2.38,"previous":2.29,"change":0.09,"percentChange":3.93}},{"tenor":"1Y","targetExpiry":1822321800290,"availability":"unavailable","unavailableReason":"The target tenor falls outside the listed-expiry range at one or both snapshots; extrapolated values are suppressed.","atmIv":{"current":null,"previous":null,"change":null,"percentChange":null},"rr25":{"current":null,"previous":null,"change":null,"percentChange":null},"bf25":{"current":null,"previous":null,"change":null,"percentChange":null}}],"realisedVolatility":{"source":"canonical/BTC-USD-INDEX (DERIBIT and OKX indexes)","fallbackObservations":88,"fallbackPolicy":"Missing canonical minutes use the stored Deribit index first, then the stored OKX index; canonical bars always take precedence.","samplingInterval":"1 minute","annualizationBasis":"365 days","windowEnd":"2026-09-30T16:30:00+00:00","spotWindowStart":"2026-09-29T16:30:00+00:00","spotMetric":"spot-index return","spotUnit":"percent","spotMove24hPercent":1.3,"rv24hPercent":41.44,"rv7dPercent":33.59,"rv30dPercent":35.3,"observations":{"24h":1440,"7d":10080,"30d":43200},"coverage":{"24h":{"status":"complete","observedReturns":1440,"expectedReturns":1440,"coveragePercent":100,"missingPriceMinutes":0,"missingIntervals":0,"largestMissingRunMinutes":0,"unavailableReason":null},"7d":{"status":"complete","observedReturns":10080,"expectedReturns":10080,"coveragePercent":100,"missingPriceMinutes":0,"missingIntervals":0,"largestMissingRunMinutes":0,"unavailableReason":null},"30d":{"status":"complete","observedReturns":43200,"expectedReturns":43200,"coveragePercent":100,"missingPriceMinutes":0,"missingIntervals":0,"largestMissingRunMinutes":0,"unavailableReason":null}},"coveragePolicy":{"version":"observed-minute-returns-v1","minimumCoveragePercent":null,"minimumCoveragePercentByWindow":{"24h":98,"7d":97,"30d":99.5},"maximumMissingRunMinutes":60,"methodology":"Each RV window qualifies independently. RV annualises the mean squared observed one-minute log return; returns spanning gaps are excluded, not interpolated or zero-filled. Partial estimates assume observed minutes are representative and may miss volatility during gaps."},"spotUnavailableReason":null,"oneWeekAtmIvPercent":30.86,"oneWeekIvMinus7dRvPoints":-2.73,"oneWeekIvMinus24hRvPoints":-10.58,"oneWeekIvMinus30dRvPoints":-4.44,"oneWeekIvTo7dRvRatio":null,"spreadPercentile":null},"realisedVolatilityUnavailableReason":null}