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Filtered-out newsletters are not charged." }, "maxSubscribers": { "title": "Max subscribers", "minimum": 0, "type": "integer", "description": "Skip newsletters above this public subscriber figure (useful for finding mid-size partners)." }, "activeWithinDays": { "title": "Only active: last post within N days", "minimum": 1, "type": "integer", "description": "Drop newsletters whose latest post is older than this. Dead newsletters are not charged." }, "onlyPaidEnabled": { "title": "Only newsletters with paid subscriptions", "type": "boolean", "description": "Only newsletters that sell paid subscriptions.", "default": false }, "onlyBestsellers": { "title": "Only Substack Bestsellers", "type": "boolean", "description": "Bestseller badge = 100+, 1,000+ or 10,000+ paid subscribers.", "default": false }, "languages": { "title": "Languages", "type": "array", "description": "Two-letter language codes (en, de, es ...). 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