{
  "schemaVersion": 3,
  "reportDate": "2026-09-16",
  "generatedAt": "2026-09-16T16:30:48+00:00",
  "currentSnapshotAt": "2026-09-16T16:30:00+00:00",
  "previousSnapshotAt": "2026-09-15T16:30:00+00:00",
  "sourceSnapshots": {
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      "id": 386630,
      "timestamp": "2026-09-16T16:30:00+00:00"
    },
    "previous": {
      "id": 376589,
      "timestamp": "2026-09-15T16:30:00+00:00"
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  "windowHours": 24.0,
  "currency": "ETH",
  "methodology": {
    "source": "Derivasys proprietary historical SVI surface and canonical ETH 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",
    "greeks": "Black forward Greeks for a normalized one-ETH ATM-forward call, zero rate, fitted SVI IV",
    "commentary": "Metrics and takeaways are deterministic. Daily headlines and introductions may be model-assisted, constrained to the same stored facts; weekly prose is deterministic.",
    "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.",
    "smileReconstruction": "Listed-expiry smiles are reconstructed from stored SVI total-variance parameters on a fixed log-moneyness grid.",
    "ultraShortExpiry": "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.",
    "causalClaims": "The report describes observed surface and realised-volatility changes only and does not infer unsupported market drivers, flows or forecasts.",
    "realisedVolatility": "Annualised root-mean-square of one-minute canonical ETH-USD index log returns using a 365-day basis; all windows end at the current snapshot."
  },
  "realisedVolatility": {
    "source": "canonical/ETH-USD-INDEX (DERIBIT and OKX indexes)",
    "fallbackObservations": 85,
    "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": "2026-09-16T16:30:00+00:00",
    "spotWindowStart": "2026-09-15T16:30:00+00:00",
    "spotMetric": "spot-index return",
    "spotUnit": "percent",
    "spotMove24hPercent": -1.07,
    "rv24hPercent": 59.58,
    "rv7dPercent": 50.76,
    "rv30dPercent": 56.27,
    "observations": {
      "24h": 1440,
      "7d": 10080,
      "30d": 43200
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    "oneWeekAtmIvPercent": 53.07,
    "oneWeekIvMinus7dRvPoints": 2.31,
    "oneWeekIvMinus24hRvPoints": -6.51,
    "oneWeekIvMinus30dRvPoints": -3.2
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  "fitQuality": {
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    "previousObjective": 0.22362243,
    "currentLiveError": 90.4285356,
    "previousLiveError": 253.99791994
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  "coverage": {
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    "previousListedExpiries": 11,
    "comparedListedExpiries": 10,
    "addedExpiries": [
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    "removedExpiries": [
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      "2W",
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    "suppressedFixedTenors": [
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  "commentary": {
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    "model": "gpt-5.6-terra",
    "headline": "Ether short-dated implied volatility retreats but retains a realised premium",
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    "newsSummary": "Decrypt reported combined outflows from Bitcoin, Ethereum and XRP ETFs of roughly $593 million. NPR reported expectations for a Federal Reserve interest-rate increase.",
    "marketContextSummary": "Both retained reports are relevant market context, but neither supplies a measured Ether-options reaction that would support a causal account of the front-end compression.",
    "marketContext": [
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        "title": "News Check",
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    "text": "1W ATM IV fell 6.05 volatility points to 53.07%, a notable move at the 86th percentile among 29 comparable historical observations. At the cutoff, realised volatility measured 59.58% over 24 hours, 50.76% over seven days and 56.27% over 30 days. Front-end ATM IV averaged 52.16%, -3.99 points from the prior snapshot, while the long end averaged 54.87%, -0.28 points. 1W RR25 moved 0.73 volatility points toward calls to -0.56%, leaving puts richer than calls. 1W BF25 fell 0.81 volatility points to 3.32%. The nearest eligible forward, 19SEP26, fell $29.63 (-1.22%) to $2,394.89. Relevant context found; no confirmed catalyst; the strongest assessed relationship has low causal confidence.",
    "wordCount": 106,
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    "evidenceFields": [
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  "facts": [
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      "id": "realised-vol",
      "label": "Implied versus realised",
      "text": "At the 16:30 UTC cutoff, 1W ATM IV was 53.07%, 2.31 volatility points above seven-day realised volatility of 50.76%; 24-hour realised volatility was 59.58% and 30-day realised volatility was 56.27%."
    },
    {
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    {
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      "text": "Long-dated ATM IV decreased, averaging -0.28 volatility points to 54.87% across 6M and 1Y."
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    {
      "id": "rr25",
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      "text": "RR25 moved towards calls, averaging +0.40 volatility points to -0.23% across the six headline tenors."
    },
    {
      "id": "bf25",
      "label": "Convexity",
      "text": "BF25 decreased, averaging -0.25 volatility points to 3.48% across the six headline tenors."
    },
    {
      "id": "largest-standard-tenor",
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      "text": "The largest standard-tenor ATM IV move was -6.05 volatility points at 1W, to 53.07%.",
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      "value": -6.05
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  "summaryMetrics": {
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      },
      "direction": "toward calls",
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    "largestBf25Move": {
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    "nearestEligibleForwardMove": {
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    }
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  "tenors": [
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      "tenor": "1W",
      "targetExpiry": 1790181000813,
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  "marketDiary": {
    "schemaVersion": 1,
    "source": "local-news-mcp",
    "generatedAt": "2026-09-16T16:30:00+00:00",
    "window": {
      "startAt": "2026-09-15T16:30:00+00:00",
      "endAt": "2026-09-16T16:30:00+00:00",
      "endExclusive": true
    },
    "headline": "Ether options cool as short-dated volatility compresses materially",
    "standfirst": "Ether one-week ATM IV fell 6.05 volatility points to 53.07% over the 24-hour observation window, an 86.2 percentile move in available Derivasys history. Ether\u2019s 24-hour spot-index return was -1.07%, while one-week ATM IV stood 2.31 volatility points above seven-day realised volatility of 50.76%. Front-end ATM IV averaged 52.16%, showing the compression was concentrated in shorter maturities.",
    "days": [
      {
        "reportDate": "2026-09-16",
        "headline": "Ether front-end volatility compresses",
        "summary": "Ether one-week ATM IV fell materially while the one-week implied-versus-realised volatility premium remained positive.",
        "macro": {
          "summary": "NPR reported expectations that the Federal Reserve would raise its benchmark interest rate.",
          "events": [
            {
              "eventId": "b9d2b91a-3d25-4cf4-8b7f-665faaac2df5",
              "title": "The Fed is expected to raise interest rates for the first time in 3 years",
              "publisher": "NPR",
              "url": "https://www.npr.org/2026/09/16/nx-s1-5968724/federal-reserve-interest-rates-inflation-economy",
              "publishedAt": "2026-09-16T09:00:00+00:00"
            }
          ]
        },
        "crypto": {
          "summary": "Decrypt reported combined Bitcoin, Ethereum and XRP ETF outflows of roughly $593 million.",
          "events": [
            {
              "eventId": "fda3f55f-b05d-4b36-8958-7a7336a8ff09",
              "title": "Bitcoin ETFs Had Their Worst Day Since June Following Failed Clarity Act Vote",
              "publisher": "Decrypt",
              "url": "https://decrypt.co/378382/bitcoin-etfs-clarity-act-vote",
              "publishedAt": "2026-09-16T15:50:07+00:00"
            }
          ]
        }
      }
    ]
  },
  "newsStatus": "context",
  "headline": "Ether options cool as short-dated volatility compresses materially",
  "standfirst": "Ether one-week ATM IV fell 6.05 volatility points to 53.07% over the 24-hour observation window, an 86.2 percentile move in available Derivasys history. Ether\u2019s 24-hour spot-index return was -1.07%, while one-week ATM IV stood 2.31 volatility points above seven-day realised volatility of 50.76%. Front-end ATM IV averaged 52.16%, showing the compression was concentrated in shorter maturities.",
  "crossAssetMarketContext": {
    "schemaVersion": 1,
    "source": "market-context-mcp",
    "status": "available",
    "asset": "ETH",
    "sessionDate": "2026-09-15",
    "asOfTimestamp": "2026-09-15T20:00:00+00:00",
    "summary": "Previous session (latest completed): Persisted common benchmark session 2026-09-15; cross-asset snapshot 2026-09-15T20:00:00Z. The crypto-minus-SPX realised-volatility spread was 32.15 points, at the 16.9 percentile across 231 prior observations. The 60-session crypto-SPX return correlation was 0.27 from 60 aligned observations.",
    "regimeInsights": [
      "The crypto-minus-SPX realised-volatility spread was 32.15 points, at the 16.9 percentile across 231 prior observations.",
      "The 60-session crypto-SPX return correlation was 0.27 from 60 aligned observations."
    ],
    "metrics": {
      "cryptoAtmIv30d": 52.73,
      "vix": 17.200000762939453,
      "vix9d": 17.21,
      "vix3m": 19.36,
      "ivSpread": 35.529999237060544,
      "ivRatio": 3.0656975384336276,
      "cryptoRealisedVol20d": 41.206775403548086,
      "spxRealisedVol20": 9.055854653060562,
      "rvSpread": 32.15092075048752,
      "rvRatio": 4.550291163255545,
      "rvSpreadPercentile": 16.883116883116884,
      "rvSpreadPercentileSampleCount": 231,
      "rvRatioPercentile": 37.66233766233766,
      "rvRatioPercentileSampleCount": 231,
      "returnCorrelation30": 0.1235934147955526,
      "returnCorrelation30SampleCount": 30,
      "returnCorrelation60": 0.2655993893857406,
      "returnCorrelation60SampleCount": 60
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    "methodology": "Derivasys market-context-v1; crypto RV uses sqrt(365), SPX RV uses sqrt(252)."
  }
}
