{"schemaVersion":1,"asset":"ETH","reportDate":"2026-09-23","timestamps":{"currentSnapshotAt":"2026-09-23T19:20:00+00:00","previousSnapshotAt":"2026-09-22T19:20:00+00:00","generatedAt":"2026-09-23T19:21:17+00:00"},"comparison":{"status":"available","note":null},"provenance":{"reportArtifact":"published daily report","sourceReport":"ETH","sourceReportHref":"/reports/eth/2026-09-23","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","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":null},"tenors":[{"tenor":"1W","targetExpiry":1790796000335,"availability":"available","unavailableReason":null,"atmIv":{"current":46.21,"previous":48.49,"change":-2.28,"percentChange":-4.7},"rr25":{"current":-0.77,"previous":0.55,"change":-1.32,"percentChange":-240},"bf25":{"current":2.95,"previous":2.83,"change":0.12,"percentChange":4.24}},{"tenor":"2W","targetExpiry":1791400800335,"availability":"available","unavailableReason":null,"atmIv":{"current":48.03,"previous":48.64,"change":-0.61,"percentChange":-1.25},"rr25":{"current":-0.3,"previous":0.58,"change":-0.88,"percentChange":-151.72},"bf25":{"current":3.04,"previous":2.8,"change":0.24,"percentChange":8.57}},{"tenor":"1M","targetExpiry":1792783200335,"availability":"available","unavailableReason":null,"atmIv":{"current":49.83,"previous":49.66,"change":0.17,"percentChange":0.34},"rr25":{"current":0.04,"previous":0.65,"change":-0.61,"percentChange":-93.85},"bf25":{"current":2.66,"previous":2.67,"change":-0.01,"percentChange":-0.37}},{"tenor":"3M","targetExpiry":1798053600335,"availability":"available","unavailableReason":null,"atmIv":{"current":52.85,"previous":52.99,"change":-0.14,"percentChange":-0.26},"rr25":{"current":0.35,"previous":0.86,"change":-0.51,"percentChange":-59.3},"bf25":{"current":3.27,"previous":2.96,"change":0.31,"percentChange":10.47}},{"tenor":"6M","targetExpiry":1805916000335,"availability":"available","unavailableReason":null,"atmIv":{"current":54.59,"previous":54.41,"change":0.18,"percentChange":0.33},"rr25":{"current":1.04,"previous":1.14,"change":-0.1,"percentChange":-8.77},"bf25":{"current":3.4,"previous":3.12,"change":0.28,"percentChange":8.97}},{"tenor":"9M","targetExpiry":1813778400335,"availability":"available","unavailableReason":null,"atmIv":{"current":55.26,"previous":55.19,"change":0.07,"percentChange":0.13},"rr25":{"current":1.63,"previous":1.85,"change":-0.22,"percentChange":-11.89},"bf25":{"current":3.05,"previous":2.93,"change":0.12,"percentChange":4.1}},{"tenor":"1Y","targetExpiry":1821727200335,"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":null,"realisedVolatilityUnavailableReason":"Canonical ETH index coverage for 24h is incomplete: expected 1440 one-minute returns, found 1415 (98.2639% coverage); returns spanning missing minutes are excluded"}