curl -H "X-API-Key: $PARTICLE_API_KEY" \
  "https://api.particle.pro/v1/podcasts/advertising/publishers/leaderboard?limit=25&metric=ad_count&min_active_podcasts=5"

{
  "data": [
    {
      "ad_count": 123,
      "ads_per_active_podcast": 123,
      "coverage": {
        "active_coverage": 123,
        "active_podcasts": 123,
        "total_podcasts": 123
      },
      "episode_reach": 123,
      "publisher": {
        "id": "<string>",
        "name": "<string>",
        "slug": "<string>"
      },
      "rank": 123,
      "unique_sponsors": 123
    }
  ],
  "has_more": true,
  "cursor": "<string>"
}

{
  "detail": "<string>",
  "error_code": "<string>",
  "errors": [
    {
      "location": "<string>",
      "message": "<string>",
      "value": "<unknown>"
    }
  ],
  "instance": "<string>",
  "resolve": {
    "message": "<string>",
    "action": "<string>",
    "endpoint": "<string>",
    "method": "<string>",
    "url": "<string>"
  },
  "status": 123,
  "title": "<string>",
  "type": "about:blank"
}