om_kh Apify Actor Catalogue

Q: How do I get Kalshi and Polymarket odds by API?

Use the Kalshi & Polymarket Scraper. Type a topic (for example `fed rate`, `election`, `bitcoin`) and it searches both exchanges through their official public APIs, returning one row per market with the same fields on both venues: implied probability, yes price, bid, ask, spread, 24h move, volume, liquidity, open interest (Kalshi), close time and rules. Leave the topic empty for the most-traded markets. $1 per 1,000 markets.

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Kalshi and Polymarket API — Prediction Market Odds as JSON

How do I get Kalshi and Polymarket odds by API?

Use the Kalshi & Polymarket Scraper. Type a topic (for example fed rate, election, bitcoin) and it searches both exchanges through their official public APIs, returning one row per market with the same fields on both venues: implied probability, yes price, bid, ask, spread, 24h move, volume, liquidity, open interest (Kalshi), close time and rules. Leave the topic empty for the most-traded markets. $1 per 1,000 markets.

Try it: Kalshi & Polymarket Scraper on Apify — click Try for free, the input is prefilled.

Step by step

Open Kalshi & Polymarket Scraper and click Try for free (an Apify account is free).
Paste this input (or fill the form):

{
  "searchTerms": [
    "fed rate",
    "election"
  ],
  "platforms": [
    "kalshi",
    "polymarket"
  ],
  "minVolume": 10000
}

Click Start. Download the results as JSON, CSV or Excel, or read them from the API.

From Python

from apify_client import ApifyClient

client = ApifyClient("<YOUR_APIFY_TOKEN>")
run = client.actor("om_kh/kalshi-polymarket-scraper").call(run_input={
    "searchTerms": [
        "fed rate",
        "election"
    ],
    "platforms": [
        "kalshi",
        "polymarket"
    ],
    "minVolume": 10000
})
for item in client.dataset(run["defaultDatasetId"]).iterate_items():
    print(item)

With one HTTP call (cURL)

curl -X POST "https://api.apify.com/v2/acts/om_kh~kalshi-polymarket-scraper/run-sync-get-dataset-items?token=<YOUR_APIFY_TOKEN>" \
  -H "Content-Type: application/json" \
  -d '{"searchTerms": ["fed rate", "election"], "platforms": ["kalshi", "polymarket"], "minVolume": 10000}'

What you get

platform (kalshi / polymarket)
question
outcome
impliedProbabilityPct
yesPrice
bestBid
bestAsk
change24h
volume
volume24h
liquidity
openInterest
closeTime
url

Price

$0.001 per market row, no start fee. You only pay for results delivered; set maxTotalChargeUsd to cap a run.

Use cases

Compare Kalshi vs Polymarket on the same event
Probability dashboards and alerts
Research and journalism
AI agents that check market odds

From an AI agent (MCP)

Connect Claude, Cursor or any MCP client to https://mcp.apify.com and add om_kh/kalshi-polymarket-scraper as a tool. The agent sends the same JSON input and gets the rows back.

FAQ

Do I need an exchange account?
No, both publish market data publicly.

Is it trading advice?
No. It only reads market data and places no trades.