curl "https://server.smartlead.ai/api/v1/lead-list/?api_key=YOUR_KEY&limit=20&offset=0"

{
  "ok": true,
  "data": [
    {
      "id": 500,
      "name": "Q1 2025 Enterprise Prospects",
      "lead_count": 1250,
      "created_at": "2025-12-01T10:00:00.000Z"
    },
    {
      "id": 501,
      "name": "SMB Tech Companies",
      "lead_count": 850,
      "created_at": "2025-12-05T14:00:00.000Z"
    }
  ]
}

{
  "message": "Invalid API Key"
}