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    "title": "Substack Newsletter Finder & Lead Generator",
    "description": "Find Substack newsletters by keyword, category or bestseller leaderboard and get sponsor-ready leads: author, subscriber count, bestseller tier, paid-plan prices and social links (X, LinkedIn, Instagram, YouTube). Filter by size, language, paid. Pay only per newsletter.",
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            "type": "array",
            "description": "Find newsletters matching these keywords (niche, topic or name). One search per line.",
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              "type": "string"
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          },
          "categories": {
            "title": "Categories",
            "type": "array",
            "description": "Substack categories to pull newsletters from.",
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              "type": "string",
              "enum": [
                "culture",
                "technology",
                "business",
                "us-politics",
                "finance",
                "food",
                "podcast",
                "sports",
                "art",
                "world-politics",
                "health-politics",
                "news",
                "fashionandbeauty",
                "music",
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                "Health Politics",
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          },
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            "title": "Category listing",
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            "type": "string",
            "description": "Which list to read for each category: Substack's paid Bestsellers leaderboard (ranked), the Rising/Trending leaderboard (ranked), or every newsletter Substack lists in the category.",
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          "publicationUrls": {
            "title": "Newsletter URLs",
            "type": "array",
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              "type": "string"
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          },
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            "title": "Include author socials & audience",
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          },
          "includeRecommendations": {
            "title": "Include recommendation network",
            "type": "boolean",
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          },
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            "title": "Minimum subscribers",
            "minimum": 0,
            "type": "integer",
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          },
          "paidOnly": {
            "title": "Paid newsletters only",
            "type": "boolean",
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          },
          "languages": {
            "title": "Languages",
            "type": "array",
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            "items": {
              "type": "string"
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          },
          "maxResultsPerSource": {
            "title": "Max newsletters per keyword / category",
            "minimum": 0,
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            "description": "Cap per keyword or category. 0 = no cap.",
            "default": 100
          },
          "maxItems": {
            "title": "Max total newsletters",
            "minimum": 0,
            "type": "integer",
            "description": "Stop after this many newsletters. 0 = no limit.",
            "default": 200
          },
          "proxyConfiguration": {
            "title": "Proxy",
            "type": "object",
            "description": "Substack's newsletter keyword search returns nothing to cloud-server IPs, so keyword searches are routed through Apify Proxy (datacenter is enough). Other requests go direct.",
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              "useApifyProxy": true
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