{
  "schemaVersion": 2,
  "reportDate": "2026-04-22",
  "generatedAt": "2026-07-25T18:42:30+00:00",
  "currentSnapshotAt": "2026-04-22T23:59:00+00:00",
  "previousSnapshotAt": "2026-04-21T23:59:00+00:00",
  "windowHours": 24.0,
  "currency": "BTC",
  "methodology": {
    "source": "Derivasys proprietary historical SVI surface database",
    "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-BTC 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 interpolated independently at 1W, 2W, 1M, 3M, 6M, 9M and 1Y; headline rankings prioritise 1W, 2W, 1M, 3M, 6M and 1Y.",
    "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 changes only and does not infer unsupported market drivers, spot moves, flows or forecasts."
  },
  "fitQuality": {
    "currentObjective": 0.86606179,
    "previousObjective": 0.73823509,
    "currentLiveError": 520.91907295,
    "previousLiveError": 355.95644235
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  "coverage": {
    "currentListedExpiries": 11,
    "previousListedExpiries": 11,
    "comparedListedExpiries": 10,
    "addedExpiries": [
      "26APR26"
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    "removedExpiries": [
      "22APR26"
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    "fixedTenors": [
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      "2W",
      "1M",
      "3M",
      "6M",
      "9M",
      "1Y"
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  "commentary": {
    "source": "deterministic",
    "model": null,
    "headline": "BTC daily surface: standard-tenor move unavailable",
    "executiveSummary": "The six headline-tenor averages are unavailable at the comparison endpoints.",
    "takeaways": [
      {
        "id": "front-atm",
        "label": "Front end",
        "text": "Front-end ATM IV is unavailable because comparable observations were not present at both snapshots."
      },
      {
        "id": "back-atm",
        "label": "Long end",
        "text": "Long-dated ATM IV is unavailable because comparable observations were not present at both snapshots."
      },
      {
        "id": "rr25",
        "label": "Skew",
        "text": "RR25 is unavailable because comparable observations were not present at both snapshots."
      },
      {
        "id": "bf25",
        "label": "Convexity",
        "text": "BF25 is unavailable because comparable observations were not present at both snapshots."
      },
      {
        "id": "largest-standard-tenor",
        "label": "Largest standard-tenor move",
        "text": "The largest standard-tenor ATM IV change is unavailable.",
        "tenor": null,
        "value": null
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      "front-atm",
      "back-atm",
      "rr25",
      "bf25",
      "largest-standard-tenor"
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  "newsEvidence": null,
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      "id": "front-atm",
      "label": "Front end",
      "text": "Front-end ATM IV is unavailable because comparable observations were not present at both snapshots."
    },
    {
      "id": "back-atm",
      "label": "Long end",
      "text": "Long-dated ATM IV is unavailable because comparable observations were not present at both snapshots."
    },
    {
      "id": "rr25",
      "label": "Skew",
      "text": "RR25 is unavailable because comparable observations were not present at both snapshots."
    },
    {
      "id": "bf25",
      "label": "Convexity",
      "text": "BF25 is unavailable because comparable observations were not present at both snapshots."
    },
    {
      "id": "largest-standard-tenor",
      "label": "Largest standard-tenor move",
      "text": "The largest standard-tenor ATM IV change is unavailable.",
      "tenor": null,
      "value": null
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    "unit": "volatility points",
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    "rr25Change": null,
    "bf25Change": null
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