Kalshi Market Scraper

Get normalized Kalshi prediction-market data from its official trade API — events, questions, live prices (last/bid/ask), 24h volume, open interest, close times, and optional orderbook depth for top markets. No login, no proxy, no scraping — pure public API.

Why this Actor

• Official API, stable output — Kalshi's public trade API with normalized JSON. No HTML parsing, no anti-bot cat-and-mouse, cheap runs.
• Prediction markets for agents & quants — live odds across Politics, Economics, Sports, Crypto, Fed Decisions, Weather and more. Perfect ground truth for LLM agents, arbitrage scanners (Kalshi ↔ Polymarket), and dashboards.
• Orderbook depth included — most prediction-market scrapers stop at prices. This one can fetch Kalshi orderbook levels for the top markets by volume.
• MCP/AI-agent ready — clean flat JSON records, works great as a tool for AI agents via Apify MCP server.

Input

Field	Type	Default	Description
maxEvents	integer	1000	How many open events to paginate (1000 ≈ 4-9k markets)
category	string	"" (all)	Optional category filter: Politics, Economics, Sports, Crypto, Weather…
minVolume24hUsd	number	0	Skip markets below this 24h volume
maxResults	integer	500	Max records returned (top by 24h volume)
includeOrderbook	boolean	false	Fetch orderbook for top markets
orderbookTopN	integer	3	How many top markets get orderbook depth

{
  "maxEvents": 1000,
  "minVolume24hUsd": 1000,
  "maxResults": 500,
  "includeOrderbook": true,
  "orderbookTopN": 3
}

Output

One JSON record per market, sorted by 24h volume:

{
  "eventTitle": "Will the Fed cut rates at the next meeting?",
  "eventTicker": "KXFEDDECISION-...",
  "category": "Fed Decisions",
  "ticker": "KXFED-...",
  "question": "Will the Fed cut rates?",
  "yesOutcome": "Yes",
  "noOutcome": "No",
  "lastPrice": 0.72,
  "yesBid": 0.71,
  "yesAsk": 0.73,
  "volume24h": 1250000.0,
  "volumeTotal": 45000000.0,
  "openInterest": 8200000.0,
  "closeTime": "2026-11-05T19:00:00Z",
  "status": "active",
  "marketType": "binary",
  "url": "https://kalshi.com/markets/KXFEDDECISION",
  "orderbook": {"bidLevels": 5, "askLevels": 4, "bestBid": 0.71, "bestAsk": 0.73}
}

Use cases

• Kalshi ↔ Polymarket arbitrage — combine with our Polymarket Market Scraper to find cross-venue price gaps
• Election / macro dashboards — live odds feeds without API keys
• AI agents — prediction-market ground truth via MCP
• Research — market-implied probabilities over time

Pricing

Pay per result: $1.50 per 1,000 market records ($0.0015/record). Compute is included — runs are cheap (API-only, no proxies).

Notes

• Data comes from Kalshi's official public trade API (api.elections.kalshi.com). Respects rate limits with small delays.
• Prices are in dollars (0.00–1.00 = implied probability).
• If Kalshi changes its API, the Actor is actively maintained — issues welcome.