curl -X GET "https://api.altsportsleagues.ai/v1/leagues/league_nll_001/compare/league_pll_002" \
  -H "Authorization: Bearer YOUR_API_KEY"

{
  "data": {
    "league_a": {
      "id": "league_nll_001",
      "name": "National Lacrosse League",
      "tier": "2.1",
      "readiness_score": 724
    },
    "league_b": {
      "id": "league_pll_002",
      "name": "Premier Lacrosse League",
      "tier": "2.3",
      "readiness_score": 681
    },
    "comparison": {
      "market_potential": { "a": 195, "b": 178, "advantage": "a" },
      "data_quality": { "a": 170, "b": 165, "advantage": "a" },
      "betting_readiness": { "a": 124, "b": 140, "advantage": "b" },
      "fan_engagement": { "a": 107, "b": 112, "advantage": "b" }
    }
  },
  "meta": {
    "api_version": "v1",
    "timestamp": "2026-03-07T21:00:00Z"
  }
}