Prediction Market Intelligence — Polymarket + Kalshi 🎲

Unified live odds and implied probabilities from Polymarket and Kalshi in one feed. No API key, no proxy.

Prediction markets are where people put real money on the questions everyone's arguing about — elections, the Fed, crypto, sports, pop culture. This actor pulls both Polymarket and Kalshi into a single normalized schema, so you get every market's implied probability (0–100%), volume and liquidity in one place — and can compare the same topic across both platforms.

Perfect for traders, journalists & newsletters, quant/research, dashboards and content ("Polymarket says 68%…").

Uses the public Polymarket Gamma and Kalshi APIs — no key, no login. The unifying metric is implied probability.

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The angle

• 🔥 Unified odds feed — top markets across both platforms, ranked by volume, with implied probabilities.
• 📈 Trending — sort by volume to see the markets everyone's betting on right now.
• ⚖️ Cross-platform compare — search a keyword (election, Fed, Bitcoin) with source: both to see Polymarket and Kalshi odds on the same topic side by side.

Features

• ✅ No API key, no proxy — public APIs, clean JSON.
• ✅ Both platforms, one schema — implied probability normalizes Polymarket prices and Kalshi cents.
• ✅ Volume/liquidity ranking — surface the markets that matter.
• ✅ Keyword + category filters — zero in on a topic.

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Input

Field	Description
Source	both / polymarket / kalshi.
Keyword	Filter market questions (e.g. election, Bitcoin).
Category	e.g. Politics, Economics, Crypto, Sports, World.
Status	open / closed / all.
Sort	volume / liquidity / probability.
Min volume	Filter out inactive/combo markets.
Max results	Markets to return after ranking.
Max scan per source	How deep to scan each platform before ranking.

Example — the hottest markets right now

{
  "source": "both",
  "status": "open",
  "sort": "volume",
  "minVolume": 10000,
  "maxResults": 100
}

Example — compare a topic across both platforms

{
  "source": "both",
  "keyword": "election",
  "maxScanPerSource": 3000
}

Output

{
  "source": "polymarket",
  "market_id": "512...",
  "question": "Will Bitcoin reach $150k by December 31, 2026?",
  "outcomes": [
    { "name": "Yes", "probability": 3.5 },
    { "name": "No", "probability": 96.5 }
  ],
  "top_outcome": "No",
  "top_probability": 96.5,
  "volume": 2657739,
  "liquidity": 84210,
  "category": "Crypto",
  "close_date": "2026-12-31T12:00:00Z",
  "status": "open",
  "url": "https://polymarket.com/event/..."
}

Kalshi markets are binary (Yes/No) with the same fields; category comes from the Kalshi event.

Run it on a schedule

Snapshot the top markets (or one topic) every hour to build a probability time-series — pipe to a sheet, database, dashboard or webhook.

Notes & limitations

• Volume differs by platform — Polymarket often has higher volume, so a volume-sorted "both" feed can be Polymarket-heavy. Use source: kalshi or a keyword/category to isolate Kalshi.
• Cross-platform "compare" groups by keyword (you eyeball the spread); it does not claim perfect auto event-matching, since the two platforms word questions differently.
• Implied probability is derived from current prices and moves in real time.
• Informational market data, not financial or betting advice. Sources: Polymarket, Kalshi.

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Keywords

prediction markets, Polymarket, Kalshi, implied probability, odds, betting odds, event markets, election odds, forecasting, market data, crypto odds, Fed odds, trading, quant, sentiment, probability, wisdom of crowds, decision markets, real-time odds, market intelligence.