{"schemaVersion":1,"asset":"SOL","reportDate":"2026-09-18","timestamps":{"currentSnapshotAt":"2026-09-18T16:30:00+00:00","previousSnapshotAt":"2026-09-17T16:30:00+00:00","generatedAt":"2026-09-18T16:31:13+00:00"},"comparison":{"status":"available","note":null},"provenance":{"reportArtifact":"published daily report","sourceReport":"SOL","sourceReportHref":"/reports/sol/2026-09-18","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":1790353800100,"availability":"available","unavailableReason":null,"atmIv":{"current":50.69,"previous":49.9,"change":0.79,"percentChange":1.58},"rr25":{"current":4.01,"previous":3.98,"change":0.03,"percentChange":0.75},"bf25":{"current":3.81,"previous":4.42,"change":-0.61,"percentChange":-13.8}},{"tenor":"2W","targetExpiry":1790958600100,"availability":"available","unavailableReason":null,"atmIv":{"current":51.97,"previous":52.04,"change":-0.07,"percentChange":-0.13},"rr25":{"current":5.09,"previous":3.04,"change":2.05,"percentChange":67.43},"bf25":{"current":3.71,"previous":4.36,"change":-0.65,"percentChange":-14.91}},{"tenor":"1M","targetExpiry":1792341000100,"availability":"available","unavailableReason":null,"atmIv":{"current":52.69,"previous":54.82,"change":-2.13,"percentChange":-3.89},"rr25":{"current":3.13,"previous":3.32,"change":-0.19,"percentChange":-5.72},"bf25":{"current":3.69,"previous":4.72,"change":-1.03,"percentChange":-21.82}},{"tenor":"3M","targetExpiry":1797611400100,"availability":"available","unavailableReason":null,"atmIv":{"current":54.03,"previous":55.77,"change":-1.74,"percentChange":-3.12},"rr25":{"current":3.4,"previous":2.89,"change":0.51,"percentChange":17.65},"bf25":{"current":5.28,"previous":5.07,"change":0.21,"percentChange":4.14}},{"tenor":"6M","targetExpiry":1805473800100,"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}},{"tenor":"9M","targetExpiry":1813336200100,"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}},{"tenor":"1Y","targetExpiry":1821285000100,"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 SOL index coverage for 7d is incomplete: expected 10080 one-minute returns, found 10042 (99.6230% coverage); returns spanning missing minutes are excluded"}