Polymarket Market Stats — Odds, Volume & Liquidity by Topic

One call answers: "What does the prediction market actually think about X?"

Instead of dumping raw market listings on you, this Actor searches Polymarket for your topics and returns a ready-to-use statistical snapshot — total and per-market volume, liquidity, how one-sided the odds are, time to resolution, and the top markets — plus every individual market if you want it.

Why market stats?

Polymarket is the world's largest prediction market: real people betting real money on elections, crypto, sports, AI milestones, and world events. Its odds are widely cited as a live probability signal — but the raw API returns hundreds of markets per topic, in inconsistent formats. This Actor turns one topic keyword into structured market intelligence:

• Track a narrative — total volume and liquidity behind a topic, in one number
• Get the odds snapshot — leading-outcome probabilities across all matched markets
• Feed your AI agent, model, or dashboard — clean JSON, USD-native
• Monitor resolution timing — median days until the matched markets resolve

Input example

{
    "topics": ["bitcoin", "fed rate cut"],
    "activeOnly": true,
    "maxMarketsPerTopic": 25
}

Output

One market_summary record per topic:

{
    "type": "market_summary",
    "topic": "bitcoin",
    "eventsFound": 14,
    "sampledMarkets": 25,
    "totalVolumeUsd": 48210344,
    "totalLiquidityUsd": 9153200,
    "volumeStatsUsd": { "min": 12040, "p25": 88113, "median": 401220, "p75": 1608114, "max": 21042001, "average": 1928413 },
    "leadingOutcomePctStats": { "min": 52, "p25": 71, "median": 88, "p75": 96, "max": 99, "average": 83 },
    "medianDaysToResolution": 9,
    "topMarketsByVolume": [
        { "question": "Bitcoin above $150k on December 31?", "leadingOutcomePct": 71.5, "volumeUsd": 21042001, "url": "https://polymarket.com/event/..." }
    ],
    "checkedAt": "2026-07-03T12:00:00+00:00"
}

Plus (optional) every sampled market with question, outcomes, probabilities, bid/ask, volume, liquidity, end date, and a direct polymarket.com URL.

Use with AI agents

Works out of the box with the Apify MCP server, so Claude, ChatGPT, and other MCP-enabled agents can check live prediction-market sentiment autonomously — for example inside a research, trading-signal, or news-monitoring workflow.

Fair use & data

• Uses only Polymarket's official public API (Gamma) — no login, no personal data
• Requests are throttled; the load on Polymarket is negligible
• Not affiliated with Polymarket. Odds are market prices, not guaranteed probabilities; do your own research

Roadmap

Kalshi comparison, historical odds tracking, and topic-level alerting. Feedback via issues is very welcome — tell me what your workflow needs.