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call_delta=N(d1); put_delta=N(d1)-1","time_unit":"ACT/365 years from collection time to Deribit expiration_timestamp","rate_source":"Deribit book summary interest_rate for each selected instrument","wing_butterfly_points":1.2550000000000026,"put_call_oi_ratio":0.4337890990822251,"contract_count":22,"source_venue":"Deribit","source_observed_at":1789316415.0673885,"calculation_version":"deribit-25delta-skew-1.1","row_id":"options-skew:ETH:1790928000"}],"health":[{"source":"deribit_options","last_success":1789316415.6634045,"stale":false,"error":null}],"limitation":"The 25-delta contracts are selected with a Black–Scholes delta calculated from Deribit mark IV, underlying, strike, rate and time. This is a live Deribit surface observation, not a historical percentile, option valuation or directional forecast."}