Polymarket API.
Crowd-priced mainlines for accurate models.

Polymarket publishes market data; KashRock normalizes its esports events into GET /v6/esports/{sport}/props?book=polymarket and the consensus on GET /v6/esports/{sport}/lines — including the CFTC-regulated polymarket_us venue on the same kr_match_id space.

• —Match and map markets as odds and implied probability.
• —Joins cleanly with Kalshi and Thunderpick on the /lines consensus path.
• —Hardens projections with live prediction-market prices — not guesses.

One key covers Polymarket and the other 24 books — every row comes back on the same schema, so nothing about the read is Polymarket-specific.

A real Polymarket row from production — the same shape every other book returns, with the canonical propId that lets you line-shop across venues.

{
  "source": "kashrock",
  "sport": "cs2",
  "props": [
    {
      "propId": "prop_5e73ad47ceb5bce8",
      "player_name": "Quintessence",
      "stat_type": "MONEYLINE_MAP_1",
      "line": null,
      "odds": 104,
      "direction": "home",
      "team": "Quintessence",
      "book_name": "Polymarket",
      "event_time": "2026-09-12T15:30:00+00:00"
    }
  ]
}

• —The app's internal endpoints change without notice — the normalized schema does not
• —Player, stat, line, direction, and team arrive already mapped to canonical KashRock ids
• —The same propId lines Polymarket up next to every other book for comparison
• —One API key and one auth header replace per-source session handling

• —Create a free Sandbox key on Pricing — $0, no card, 500 requests every UTC day
• —Call GET /v6/esports/cs2/props?book=polymarket with the key in the X-API-Key header
• —Filter by stat_type, player, or match — the response is the board as KashRock serves it