{ "schemaVersion": 2, "reportDate": "2026-04-30", "generatedAt": "2026-07-25T18:42:31+00:00", "currentSnapshotAt": "2026-04-30T23:57:00+00:00", "previousSnapshotAt": "2026-04-29T23:57:00+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": 0.14582304, "previousObjective": 0.21721991, "currentLiveError": 208.9895806, "previousLiveError": 270.07733928 }, "coverage": { "currentListedExpiries": 13, "previousListedExpiries": 12, "comparedListedExpiries": 11, "addedExpiries": [ "22MAY26", "4MAY26" ], "removedExpiries": [ "30APR26" ], "fixedTenors": [ "1W", "2W", "1M", "3M", "6M", "9M", "1Y" ] }, "commentary": { "source": "deterministic", "model": null, "headline": "BTC daily surface: 1W ATM IV falls 0.78 volatility points", "executiveSummary": "Across the six headline tenors, ATM IV averaged -0.33 volatility points, RR25 +0.77 volatility points and BF25 -0.09 volatility points between the stored endpoints.", "takeaways": [ { "id": "front-atm", "label": "Front end", "text": "Front-end ATM IV decreased, averaging -0.39 volatility points across 1W, 2W and 1M." }, { "id": "back-atm", "label": "Long end", "text": "Long-dated ATM IV decreased, averaging -0.15 volatility points across 6M and 1Y." }, { "id": "rr25", "label": "Skew", "text": "RR25 moved towards calls, averaging +0.77 volatility points across the six headline tenors." }, { "id": "bf25", "label": "Convexity", "text": "BF25 was broadly unchanged, averaging -0.09 volatility points across the six headline tenors." }, { "id": "largest-standard-tenor", "label": "Largest standard-tenor move", "text": "The largest standard-tenor ATM IV move was -0.78 volatility points at 1W.", "tenor": "1W", "value": -0.78 } ], "evidenceIds": [ "front-atm", "back-atm", "rr25", "bf25", "largest-standard-tenor" ] }, "newsEvidence": null, "facts": [ { "id": "front-atm", "label": "Front end", "text": "Front-end ATM IV decreased, averaging -0.39 volatility points across 1W, 2W and 1M." }, { "id": "back-atm", "label": "Long end", "text": "Long-dated ATM IV decreased, averaging -0.15 volatility points across 6M and 1Y." }, { "id": "rr25", "label": "Skew", "text": "RR25 moved towards calls, averaging +0.77 volatility points across the six headline tenors." }, { "id": "bf25", "label": "Convexity", "text": "BF25 was broadly unchanged, averaging -0.09 volatility points across the six headline tenors." }, { "id": "largest-standard-tenor", "label": "Largest standard-tenor move", "text": "The largest standard-tenor ATM IV move was -0.78 volatility points at 1W.", "tenor": "1W", "value": -0.78 } ], "summaryMetrics": { "basis": "Average change across 1W, 2W, 1M, 3M, 6M and 1Y", "unit": "volatility points", "atmIvChange": -0.33, "rr25Change": 0.77, "bf25Change": -0.09 }, "tenors": [ { "tenor": "1W", "targetExpiry": 1778198222727, "availability": "available", "unavailableReason": null, "atmIv": { "current": 34.13, "previous": 34.91, "change": -0.78, "percentChange": -2.23 }, "rr25": { 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