Bitcoin options see one-week butterfly premium fall

BTC · Surface cutoff 25 Sept 2026, 17:28:00 UTC. 7d RV requires at least 97% valid one-minute returns and no price gap over 60 minutes; coverage is 99.3056% with 68 missing price minutes across 2 intervals and a largest gap of 67 minutes.

{
  "source": "canonical/BTC-USD-INDEX (DERIBIT and OKX indexes)",
  "fallbackObservations": 72,
  "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": "2026-09-25T17:28:00+00:00",
  "spotWindowStart": "2026-09-24T17:28:00+00:00",
  "spotMetric": "spot-index return",
  "spotUnit": "percent",
  "spotMove24hPercent": -0.56,
  "rv24hPercent": null,
  "rv7dPercent": null,
  "rv30dPercent": null,
  "observations": {
    "24h": 1370,
    "7d": 10010,
    "30d": 43130
  },
  "coverage": {
    "24h": {
      "status": "unavailable",
      "observedReturns": 1370,
      "expectedReturns": 1440,
      "coveragePercent": 95.1389,
      "missingPriceMinutes": 68,
      "missingIntervals": 2,
      "largestMissingRunMinutes": 67,
      "unavailableReason": "24h RV requires at least 98% valid one-minute returns and no price gap over 60 minutes; coverage is 95.1389% with 68 missing price minutes across 2 intervals and a largest gap of 67 minutes."
    },
    "7d": {
      "status": "unavailable",
      "observedReturns": 10010,
      "expectedReturns": 10080,
      "coveragePercent": 99.3056,
      "missingPriceMinutes": 68,
      "missingIntervals": 2,
      "largestMissingRunMinutes": 67,
      "unavailableReason": "7d RV requires at least 97% valid one-minute returns and no price gap over 60 minutes; coverage is 99.3056% with 68 missing price minutes across 2 intervals and a largest gap of 67 minutes."
    },
    "30d": {
      "status": "unavailable",
      "observedReturns": 43130,
      "expectedReturns": 43200,
      "coveragePercent": 99.838,
      "missingPriceMinutes": 68,
      "missingIntervals": 2,
      "largestMissingRunMinutes": 67,
      "unavailableReason": "30d RV requires at least 99.5% valid one-minute returns and no price gap over 60 minutes; coverage is 99.8380% with 68 missing price minutes across 2 intervals and a largest gap of 67 minutes."
    }
  },
  "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": 29.94,
  "oneWeekIvMinus7dRvPoints": null,
  "oneWeekIvMinus24hRvPoints": null,
  "oneWeekIvMinus30dRvPoints": null
}