Polymarket & Kalshi Sports Prediction Markets

What does Polymarket & Kalshi Sports Prediction Markets do?

Polymarket & Kalshi Sports Prediction Markets collects live sports market prices from Polymarket and Kalshi in one dataset. Each row is one market with the question, its outcomes, the implied probability and decimal odds of every outcome, best bid and ask, traded volume, liquidity or open interest, close date and a link to the market. Filter by keyword such as NFL, NBA or UFC, or leave the filter empty to get every open sports market.

Why use Polymarket & Kalshi Sports Prediction Markets?

• Both platforms in a single run and a single schema, ready to compare.
• Every outcome comes with implied probability and decimal odds, so it lines up with sportsbook prices.
• Settled and closed markets are dropped, so rows are live markets only.
• Keyword filter and minimum-volume filter remove noise.
• Works logged out; no account or API key needed.

What makes this different

Most prediction-market scrapers cover one platform and return raw payloads. This Actor puts Polymarket and Kalshi into one flat schema, converts every outcome price into implied probability and decimal odds, and drops settled markets so the dataset only contains markets you can still trade.

How it works

1. Your input — choose a platform and optional keywords such as NFL or UFC.
2. The Actor collects it — the Actor reads the open sports markets and drops settled ones.
3. Your output — you get one clean row per market with probabilities, odds, volume and links.

What data can you extract?

The dataset has 18 fields per row:

Field	Type	Description
platform	string	polymarket or kalshi.
marketId	string	Platform market identifier.
eventId	string	Platform event identifier.
eventTitle	string	Title of the event the market belongs to.
question	string	The market question.
tags	array	Sport or series tags.
outcomes	array	Outcomes with name, price (probability), decimalOdds, bid and ask.
bestBid	number	Best bid for the first outcome.
bestAsk	number	Best ask for the first outcome.
volumeUnit	string	usd or contracts.
volume	number	Total traded volume.
volume24h	number	Volume in the last 24 hours.
liquidity	number	Liquidity on the market.
openInterest	number	Open interest (Kalshi).
endDate	string	Close or end date (ISO 8601).
status	string	open, closed or active.
url	string	Link to the market.
scrapedAt	string	Collection time (ISO 8601).

How to use Polymarket & Kalshi Sports Prediction Markets

1. Open the Actor and go to the Input tab.
2. Choose a Platform, add optional Keywords such as nfl, and set Max markets per platform.
3. Optionally set filters and a Max results limit.
4. Click Start. A default run finishes in under a minute.
5. Open the Output tab, then download the dataset or connect it to your tools.

Input Parameters

Parameter	Type	Required	Default	Description
platform	string	No	"both"	Which prediction market to read.
searchTerms	array	No	[]	Only return markets whose title or category contains one of these words, for example NBA, NFL, Premier League, UFC, tennis. Leave empty for every sport.
maxMarkets	integer	No	5	Maximum number of markets to return from each platform. Default is 5 for a quick test; set 0 to return everything available.
minVolume	number	No	—	Skip thin markets below this traded volume (dollars on Polymarket, contracts on Kalshi).
proxyConfiguration	object	No	{"useApifyProxy":false}	Optional. Both platforms work without a proxy in most regions.

Output Data

Prices are probabilities between 0 and 1; decimalOdds is 1 divided by the probability. volume is in dollars for Polymarket and contracts for Kalshi (see volumeUnit). Fields that do not apply to a platform are null.

A real dataset item:

{
  "platform": "polymarket",
  "marketId": "1357371",
  "eventId": "202857",
  "eventTitle": "Pro Football: 2027 Champion",
  "question": "Will the Arizona Cardinals win the 2027 NFL league championship?",
  "tags": [
    "nfl",
    "football",
    "super-bowl",
    "nfl-team-futures"
  ],
  "outcomes": [
    {
      "name": "Yes",
      "price": 0.0045,
      "decimalOdds": 222.222,
      "bid": null,
      "ask": null
    },
    {
      "name": "No",
      "price": 0.9955,
      "decimalOdds": 1.005,
      "bid": null,
      "ask": null
    }
  ],
  "bestBid": 0.004,
  "bestAsk": 0.005,
  "volumeUnit": "usd",
  "volume": 1437136.490401,
  "volume24h": 13326.9,
  "liquidity": 546634.69546,
  "openInterest": null,
  "endDate": "2027-03-31T23:55:00Z",
  "status": "open",
  "url": "https://polymarket.com/event/pro-football-2027-champion-20260729185915366",
  "scrapedAt": "2026-09-21T10:54:24.832Z"
}

Usage Examples

All open NFL markets

{
  "platform": "both",
  "searchTerms": [
    "nfl"
  ],
  "maxMarkets": 50
}

Top Kalshi sports markets

{
  "platform": "kalshi",
  "maxMarkets": 100,
  "minVolume": 1000
}

Polymarket soccer markets

{
  "platform": "polymarket",
  "searchTerms": [
    "premier league",
    "champions league"
  ]
}

Tips for Best Results

• Compare decimalOdds with a sportsbook price to spot gaps.
• Use minimum volume to skip illiquid markets whose price is not meaningful.
• Schedule the Actor hourly to keep a price history.
• Default is 5 results for a fast test. Set the max to 0 to return everything available.

Known Limitations

• Prices are a snapshot at collection time.
• Kalshi volume is in contracts and Polymarket volume is in dollars, so they are not directly comparable.
• Only open sports markets are returned; settled markets are excluded.
• Platform availability varies by country.

Integrations

Run it from the Apify API, on a schedule, or from a webhook. Send results straight to Google Sheets, Make, Zapier, Slack or your own database with Apify's built-in integrations.

Export Formats

Download the dataset as JSON, CSV, Excel, XML, HTML table or RSS from the Output tab or the API.

Frequently Asked Questions

Does it need an account or API key?

No. It reads public market data and needs no login.

What does the price mean?

The price is the market's implied probability for that outcome, between 0 and 1. decimalOdds converts it to sportsbook-style decimal odds.

Am I charged for failed results?

No. You are only charged for markets that are written to the dataset.

Do I need an account or login?

No. The Actor reads public market data and needs no account or API key.

Am I charged for failed runs or empty results?

You are only charged for results that are actually written to the dataset.

Can I run it on a schedule?

Yes. Create a Task with your input and add a schedule in Apify Console. With monitor mode on, each scheduled run returns only what changed since the previous one.

Support

Questions or a missing field? Open an issue from the Issues tab on this Actor's page and it will be looked at.

Legal / Responsible Use

You are responsible for using the collected data in line with each platform's terms and the laws that apply to you. The Actor collects publicly displayed market prices only.