Polymarket Data: Odds History, Volume & Open Interest

Free demo: runs and API requests return a fixed sample of real rows. Your accounts, queries, dates, and filters are not applied. Repeating a run returns the same sample; a smaller row limit returns its prefix. Upgrade your Apify plan to request your own data. Demo rows have no result charge; the listed Actor start charge still applies.

Available Polymarket markets with odds, volume, liquidity, and open interest, plus historical odds at intervals from 1 minute to 1 day. Coverage and update times vary by event and market. Paste event links or type keywords.

$1 per 1,000 rows. Try the fixed Free demo.

Why use it

• Odds history. Odds and open interest over time for every outcome, from 1 minute to 1 day.
• Paste a link. Paste any polymarket.com event link, or search by keyword such as "fed" or "election".
• Markets grouped by event. A 2028 nominee event has 100+ markets; you get all of them, most active first.
• Volume and open interest. 24-hour volume, liquidity and open interest for each market.

Quick start

Current odds for an event:

{ "events": ["https://polymarket.com/event/democratic-presidential-nominee-2028"] }

Available daily odds history for Fed-related markets:

{ "search": ["fed"], "data": "history", "interval": "1d", "from": "2026-01-01" }

Leave Events and Search empty to get today's biggest events.

What you get

Field	What it is
event, question, outcome	The event, the market's question and the outcome priced
probability, best_bid, best_ask	Current odds (0 to 1)
volume_24h_usd, liquidity_usd, open_interest_usd	Money traded, available, and at stake (USD)
closes_at, status, winner	When it closes and, once resolved, who won
time, open, high, low, close	History rows: odds per interval
volume_usd, trades	History rows: activity per interval

Example

{
  "type": "market",
  "event": "Democratic Presidential Nominee 2028",
  "event_url": "https://polymarket.com/event/democratic-presidential-nominee-2028",
  "question": "Will Abigail Spanberger win the 2028 Democratic presidential nomination?",
  "outcome": "Yes",
  "other_outcome": "No",
  "probability": 0.0015,
  "best_bid": 0.001,
  "best_ask": 0.002,
  "volume_24h_usd": 1646381.09,
  "liquidity_usd": 414879.04,
  "open_interest_usd": 6389.13,
  "status": "OPEN",
  "closes_at": "2028-11-07T00:00:00.000Z"
}

Download as CSV, Excel, or JSON.

Use it as an API

Call it like a REST API, with no runs to manage: /markets and /history answer in JSON with the same rows and prices as a run. Try them in the Endpoints tab, or copy the Actor's URL from there:

curl -H "Authorization: Bearer YOUR_APIFY_TOKEN" \
  "https://ACTOR_URL/markets?search=fed"

Pricing

Prices below are result fees. The Pricing tab also lists an Actor start charge, including for empty runs, demo runs, and problem reports. Demo rows have no result charge. Custom data requires a paid Apify plan. Its subscription includes usage credit; it is not a separate Feedd subscription. API calls require an Apify token.

$1 per 1,000 rows: the current odds of a 100-market event cost 10 cents. On Apify's Business plan, $0.80 per 1,000. Paid plans return available closed intervals; collection delays can vary. A run stops at 10,000 rows unless you raise Maximum rows.

Apify Free plan: fixed sample data only. Runs and API calls return the same sample. Upgrade for custom data at the result rates above.

FAQ

Which markets? Polymarket's 1,000+ most active markets across politics, sports, crypto, economy, and world events, including closed and resolved ones when you ask.

How far back does history go? Back to 2025 for long-running markets; newer markets from the day they opened.

Can AI agents use it? Yes. Add https://mcp.apify.com?tools=feeddlabs/polymarket-odds-history to Claude, ChatGPT, or Cursor and ask, for example, "What are the odds of a Fed cut in October, and how have they moved this month?"

Something not right? Write it in Report a problem and run the Actor. The run only submits your report, with no result charge. The listed Actor start charge still applies. AI agents can report problems too.

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