Polymarket Scraper & API — Odds, Probabilities, Volume

Polymarket Scraper & API turns the whole Polymarket exchange into a table. Every market comes back with the implied probability in per cent, the yes and no price, best bid and ask, the 24-hour move, volume, resting liquidity, the close date and a link — no wallet, no API key, no browser.

Five modes: markets (one row per tradable contract), events (one row per question with every outcome and its probability), search by keyword, price history, and the order book with both sides. A run over the active markets takes a few seconds.

What is Polymarket Scraper?

Polymarket is the global crypto-settled prediction market: contracts that pay $1 if something happens, on elections, wars, rates, crypto prices, culture and sport. Its price is the crowd's probability, and this Actor reads all of it in one call — for traders, journalists, researchers, dashboards and AI agents that get asked "what are the odds this candidate wins".

What data does it return?

Markets

Field	Example
marketId, slug, clobTokenIds	516729 · will-the-fed-cut-in-september
question, shortTitle, eventTitle	Will the Fed cut rates in September?
probability, yesPrice, noPrice	62.0 (per cent) · 0.62 · 0.38
bestBid, bestAsk, spread, lastPrice	0.61 · 0.63 · 0.02 · 0.62
priceChange24h	0.04 — a move in price, so ±0.04 is four points of probability
volume, volume24h, volume1w, liquidity	4,120,880 · 218,400 · … · 96,300
status, result	open · empty until it settles
openTime, closeTime, endDate	ISO 8601
category, tags, image	Economics · ["Fed Rates", "Politics"]
outcomes	[{name: "Yes", price: 0.62, probability: 62.0}, {name: "No", …}]
rules, url	resolution text · link to the market

liquidity is the money resting in the order book — Polymarket's own depth figure. clobTokenIds is what the history and order-book modes need, and it comes back on every row.

Events

One row per question with outcomes sorted most likely first, favourite and favouriteProbability, outcomeCount, total volume and liquidity, and a ready summary sentence. This is the shape for "who will win": one row for the whole race with every candidate and their probability, instead of one contract per candidate.

Price history and order book

History returns one row per point with time, price and probability — a week at fine resolution by default, up to 90 days at daily granularity. The order book returns both sides with price and size per level.

How much does it cost?

Pay per row, and only for rows you actually get:

Event	Price
Market	$0.0015
Event	$0.0008
Price point	$0.0002
Order book snapshot	$0.001

Error rows are never charged. There is no browser and no proxy — one public JSON API — so platform usage on top of that is negligible.

Job	Cost
500 active markets	$0.75
100 markets with 30 days of price history	$0.80
A daily 200-market snapshot for a month	$9.00

Other Polymarket Actors charge $0.001 to $0.012 per row, and the ones at the top of that range return the market list only. This one sits near the bottom of the range and adds events, history and order books.

How to use it

1. Choose 📋 What to get: markets, events, search, history or order book.
2. Narrow with 🔍 Keyword (fed, election, bitcoin, super bowl) and 🏷️ Category — several at once, Politics, Crypto keeps a market matching either.
3. Set 💧 Minimum volume or 💧 Minimum liquidity. Polymarket lists thousands of near-empty contracts; a volume floor of 1000 keeps the ones people actually trade.
4. Sort by 24-hour volume, total volume, liquidity, closing date, probability or biggest 24-hour move.
5. Click Start, then export as JSON, CSV or Excel, or read the dataset through the API.

⬇️ Input

{
  "mode": "markets",
  "query": "election",
  "minVolume": 1000,
  "sortBy": "volume24h",
  "maxMarkets": 200
}

Events with all outcomes

{ "mode": "events", "category": "Politics", "minVolume": 5000, "maxMarkets": 50 }

Price history for specific markets

{ "mode": "history", "marketIds": ["516729"], "historyDays": 30 }

The deepest books only

{ "mode": "markets", "minLiquidity": 50000, "sortBy": "liquidity" }

⬆️ Output

{
  "type": "market",
  "platform": "polymarket",
  "marketId": "516729",
  "slug": "will-the-fed-cut-in-september",
  "question": "Will the Fed cut rates in September?",
  "eventTitle": "Fed decision in September",
  "category": "Economics",
  "probability": 62,
  "yesPrice": 0.62,
  "noPrice": 0.38,
  "bestBid": 0.61,
  "bestAsk": 0.63,
  "spread": 0.02,
  "lastPrice": 0.62,
  "priceChange24h": 0.04,
  "volume": 4120880.5,
  "volume24h": 218400.25,
  "liquidity": 96300.75,
  "status": "open",
  "closeTime": "2026-09-18T20:00:00Z",
  "outcomes": [
    { "name": "Yes", "price": 0.62, "probability": 62 },
    { "name": "No", "price": 0.38, "probability": 38 }
  ],
  "clobTokenIds": ["7147...", "1029..."],
  "url": "https://polymarket.com/event/will-the-fed-cut-in-september",
  "scrapedAt": "2026-09-04T01:00:00.000Z"
}

A request that fails arrives as a type: "error" row with the reason, never as a silently short list.

Use cases

Odds for a theme

Filter on election, bitcoin or fed and get every Polymarket contract on it with the probability each one implies.

Dashboards and newsletters

Sort by 24-hour move to see what repriced overnight, or by closing date for what resolves this week.

Research

Pull price history for a set of markets and study how the crowd's estimate moved against the news.

Bots and alerts

Schedule the run and alert when a probability crosses a threshold you care about.

AI agents

An agent asked "what does Polymarket say about the election" runs the search mode and reads probability straight off the rows.

🤖 For AI Agents & LLM Apps

Compact reference for agents calling this Actor through the Apify MCP server or the Apify API (lergassy/polymarket-scraper).

Purpose: returns what Polymarket currently prices for a question. Use it for "what are the odds of X", "which markets moved most today", "what does the crowd think about the election".

Minimal input:

{ "query": "election", "minVolume": 1000, "maxMarkets": 50 }

Output: one row per market — marketId, slug, question, eventTitle, category, tags, probability (per cent, the number to quote), yesPrice, noPrice, bestBid, bestAsk, spread, lastPrice, priceChange24h, volume, volume24h, liquidity, status, openTime, closeTime, outcomes, clobTokenIds, rules, url, scrapedAt. Event mode returns outcomes sorted by probability with favourite and a summary sentence; history mode one row per price point; order-book mode one row per market with both sides.

Behaviors an agent should know:

• probability is the field to quote, in per cent. yesPrice is the same number as a price between 0 and 1, because one contract pays $1 if the event happens.
• priceChange24h is a change in price, so 0.04 means four percentage points of probability.
• Polymarket lists thousands of near-empty markets. Always pass minVolume (1000 is a good floor) or the answer fills with noise.
• Depth here is liquidity, in dollars resting in the book. Polymarket publishes no open-interest figure at all.
• Filters are applied by this Actor: query matches the question, event title and tags; category matches Polymarket tags.
• Read rules before treating a market as the bet you have in mind — the resolution wording decides what actually pays.
• History and order books need the market's clobTokenIds, which come from the markets mode; passing a bare marketIds without having read the market first will not resolve a token.
• The API is public: no wallet, no key, no proxy.

Polymarket API without a wallet

Polymarket's Gamma and CLOB endpoints are open but awkward: prices arrive as strings, outcomes as encoded arrays, and paging past the end answers with an HTTP 422 that is not an error. This Actor handles all of it and returns one stable row shape.

❓ FAQ

Is this financial advice or a trading tool?

No. It reads public market data and returns it as a table. It places no orders and holds no positions. Polymarket is restricted in some jurisdictions.

Is the probability the true chance of the event?

It is what the market pays, which is the crowd's price after fees and risk appetite. Treat it as a market price, not a forecast from a model.

How fresh are the numbers?

Live at the moment of the run. Schedule the Actor to build a time series of your own.

Do I need a wallet or an account?

No. The endpoints used here are public and read-only.

Why is there no open-interest column?

Because Polymarket does not publish one. Liquidity — money resting in the order book — is its depth measure.

Can I use it with the Apify API or an MCP server?

Yes. It runs from the API and the official clients, and AI agents reach it through the Apify MCP server without extra setup.

Your feedback

Missing a field, or a market type you want covered? Open an issue on the Issues tab — every one gets answered.

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Also known as

People look for this Actor as a Polymarket API, a Polymarket scraper, prediction market data, Polymarket odds, implied probability data, event contracts and election odds.