Polymarket Scraper 📊

Scrape Polymarket prediction markets and events — questions, live odds, outcome prices, trading volume, liquidity, bid/ask spreads and resolution dates — as clean, structured JSON. No API key, no login, no proxy required.

Polymarket is the world's largest prediction market. Traders, quant researchers, journalists and forecasters use its odds as a real-money signal for elections, crypto, sports, macro and current events. This actor turns that live market data into a tidy dataset you can drop into a spreadsheet, database, dashboard or model.

---

✨ What you get

• Markets mode — individual prediction questions ("Will X happen by date?") with their live outcome prices (implied probabilities), volume, liquidity, best bid/ask and last trade price.
• Events mode — grouped events that bundle many related markets (e.g. "Democratic Presidential Nominee 2028" with all candidate sub-markets), including tags and a compact list of child markets.
• Live odds — outcome_prices are the market-implied probabilities (they sum to ~1.0), decoded from Polymarket's JSON-string encoding into real number arrays for you.
• Fully flat & nullable — one item per row, every field nullable, ready for CSV/Excel/JSON/API export.

🔧 Input

Field	Type	Default	Description
mode	select	markets	markets (individual questions) or events (grouped markets).
active	boolean	true	Only currently active/tradeable markets.
closed	boolean	false	Include resolved/closed markets.
order	string	volume	Sort field (descending): volume, liquidity, startDate, endDate.
maxItems	integer	100	Max markets/events to scrape (1–1000).

Example input

{
  "mode": "markets",
  "active": true,
  "closed": false,
  "order": "volume",
  "maxItems": 100
}

📤 Output

Each market item:

{
  "type": "market",
  "id": "2874986",
  "question": "Will the next Google Gemini Pro model be released by July 29, 2026?",
  "slug": "will-the-next-google-gemini-pro-model-be-released-by-july-29-2026",
  "category": null,
  "volume": 999.95,
  "liquidity": 332.27,
  "outcomes": ["Yes", "No"],
  "outcome_prices": [0.085, 0.915],
  "best_bid": 0.05,
  "best_ask": 0.12,
  "last_trade_price": 0.11,
  "active": true,
  "closed": false,
  "start_date": "2026-07-10T22:21:10+00:00",
  "end_date": "2026-07-29T16:00:00+00:00",
  "url": "https://polymarket.com/event/will-the-next-google-gemini-pro-model-be-released-by-july-29-2026",
  "source": "polymarket",
  "scraped_at": "2026-07-20T17:00:00+00:00"
}

Each event item adds title, num_markets, tags, open_interest and a compact markets array with each child question and its odds.

outcome_prices are the market-implied probabilities of each outcome — e.g. [0.085, 0.915] means the market prices "Yes" at ~8.5% and "No" at ~91.5%.

💡 Use cases

• Prediction market analysis — track how odds move on elections, policy, crypto and sports over time.
• Algorithmic trading & signals — pull bid/ask, spread and last trade price to spot mispricings and build strategies.
• Sentiment & forecasting research — use real-money crowd probabilities as a benchmark for academic or quant models.
• News & journalism — cite live market odds in coverage of elections and breaking events.

💰 Pricing

Roughly ~$0.50 per 1,000 items on the Apify platform. The Polymarket Gamma API is free and datacenter-friendly, so runs are cheap and fast — no residential proxy needed.

🔗 Related actors

• CoinGecko Crypto Scraper
• DexScreener Scraper
• GDELT News Scraper
• Google News Scraper

❓ FAQ

Do I need an API key? No. The public Polymarket Gamma API needs no key or login.

Is the data live? Yes — every run hits the API in real time, so odds, volume and liquidity reflect the current market.

What are outcome_prices? The market-implied probability of each outcome, decoded into a numeric array. They normally sum to ~1.0.

Keywords: polymarket scraper, prediction market data, polymarket api, prediction market odds, betting odds scraper, election odds, crypto prediction markets, market probabilities, polymarket volume, forecasting data, sentiment data, event contracts, trading signals.