{"schema_version":1,"publisher":"Half on a Double","data_through":"2026-10-02","frequency":"end-of-day","methodology":"market-implied-carry-v1","generation":"market-implied-carry-analytics-20260917T000000Z","canonical_url":"https://halfonadouble.com/stock/SDY","markdown_url":null,"history_url":"https://halfonadouble.com/api/v1/history/SDY.csv","advanced_analysis_url":"https://halfonadouble.com/api/v1/analysis/SDY.json?date=2026-10-02","definitions_url":"https://halfonadouble.com/methodology.md","license_url":"https://halfonadouble.com/terms.md","disclaimer_url":"https://halfonadouble.com/disclaimer.md","symbol":"SDY","page_tier":"B","units":{"prices":"USD per share","open_interest":"option contracts","gamma_exposure":"modeled dollar-delta change per USD 1 underlying move","gamma_exposure_normalized":"modeled gamma exposure per 100,000 open option contracts","distances":"percent of close","forward_outcomes":"close-to-close percent return"},"snapshot":{"close":147.57000732421875,"previous_close":147.49000549316406,"delta_neutral":142.06443536192728,"gamma_neutral":133.11811285399244,"gamma_max":154.00749473152857,"total_open_interest":1188,"previous_open_interest":1186,"listed_contracts":99,"listed_calls":66,"listed_puts":33,"gamma_max_distance_pct":4.362327768383404,"delta_neutral_distance_pct":-3.7308204167771373,"gamma_neutral_distance_pct":-9.79324642742259,"open_interest_change_1d_pct":0.16863406408094433,"call_open_interest":879,"put_open_interest":309,"put_call_open_interest_ratio":0.3515358361774744,"nearest_expiration_max_pain":146,"nearest_expiration_max_pain_expiry":"2026-10-16","nearest_expiration_max_pain_distance_pct":-1.063906787487897,"all_expiration_max_pain":146,"net_gamma_exposure":271019.67833191535,"net_gamma_exposure_per_100k_open_interest":22813104.23669321,"gamma_exposure_flip":133.11811285399244,"gamma_exposure_flip_distance_pct":-9.79324642742259,"call_wall":150,"call_wall_distance_pct":1.6466711087453112,"put_wall":146,"put_wall_distance_pct":-1.063906787487897,"gamma_max_cross_direction":null,"delta_neutral_cross_direction":null,"open_interest_rank":3576},"history_summary":null,"advanced_options":{"data_through":"2026-10-02","analysis_coverage":0.8333,"catalyst_score":null,"directional_score":null,"catalyst_reasons":[],"features":{"symbol":"SDY","price":147.57,"totalOi":1188,"analysisCoverage":0.8333,"avgIvPct":22.7,"ivRank":8.4,"iv52wHighPct":55.64,"iv52wLowPct":19.68,"frontDte":14,"frontAtmIvPct":16.7477,"backAtmIvPct":14.7927,"termPremiumPp":1.955,"expectedMoveFrontPct":3.28,"straddleFrontPct":null,"straddle30dPct":null,"riskReversalFrontPp":39.23,"riskReversal30dPp":39.23,"butterflyFrontPp":null,"butterfly30dPp":null,"putCallOiRatio":0.352,"putCallOiFrontRatio":0.428,"putCallVolumeFrontRatio":0,"optionVolume":13,"volumeOiRatio":0.010943,"netDeltaNormalized":0.148603,"dealerDeltaNormalized":-0.148603,"gexPer100kOi":32147015.151515,"vannaPer100kOi":841.750842,"charmPer100kOi":-200168.350168,"weekendDeltaShiftPer100kOi":-600589.225589,"ivSurfaceRangePp":67.8,"gammaFlipDistancePct":-1.84997,"maxPainDistancePct":-1.063902,"peakCallDistancePct":null,"peakPutDistancePct":-5.129769},"complete_analysis_url":"https://halfonadouble.com/api/v1/analysis/SDY.json?date=2026-10-02","interpretation":"Catalyst intensity ranks unusual option pricing and activity; it does not identify the event, predict direction or recommend a trade. Directional score summarizes relative positioning under documented model conventions."},"gamma_max_cross_outcomes":[],"missing_value_semantics":"null means unavailable; it never means zero","interpretation":"These are descriptive end-of-day model outputs. Signed GEX uses the published call-positive, put-negative convention and is not observed dealer inventory. None of the fields are live prices, predictions or investment advice."}