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Calls dominating unusual flow = bullish skew, puts dominating = bearish/hedging skew.", "default": "all" }, "min_volume": { "title": "Minimum option volume", "minimum": 0, "maximum": 1000000, "type": "integer", "description": "Only return contracts where today's volume is at or above this threshold. Filters out low-liquidity noise. Typical unusual-activity threshold is 500+ contracts.", "default": 500 }, "min_volume_oi_ratio": { "title": "Minimum volume / open interest ratio", "minimum": 0, "maximum": 1000, "type": "number", "description": "Only return contracts where today's volume divided by open interest is at or above this ratio. Vol/OI > 2 is typically unusual, > 10 is highly unusual (potential sweep / smart-money flow).", "default": 2 }, "max_days_to_expiration": { "title": "Maximum days to expiration", "minimum": 0, "maximum": 1000, "type": "integer", "description": "Only return contracts that expire within this many days. 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