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from $2.50 / 1,000 results

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Prediction Markets — Polymarket & Kalshi, One Schema

Try for free

Live prices, volume and liquidity from Polymarket and Kalshi in one unified, CSV-ready dataset — so you can compare or arbitrage across both venues without writing two parsers. Free public APIs, no keys.

Pricing

from $2.50 / 1,000 results

Rating

0.0

(0)

Developer

alaudin burki

Actor stats

Bookmarked

Total users

Monthly active users

2 days ago

Last modified

What you get

Field	Description
`source`	Source
`question`	Question
`category`	Category
`yesPrice`	Yes Price
`noPrice`	No Price
`volume`	Volume
`liquidity`	Liquidity
`status`	Status
`url`	Url

How to use it

Fill in the input (see the example below).
Run it once for a snapshot, or schedule it to keep the data fresh.
Export to CSV/JSON/Excel, or push straight to Google Sheets, Notion, Airtable, Zapier, Make, or n8n.

Input

{
  "sources": [
    "polymarket",
    "kalshi"
  ],
  "query": "",
  "onlyOpen": true,
  "maxItems": 1000
}

Sample output

[
{
  "source": "example",
  "question": "example",
  "category": "example",
  "yesPrice": 29.99,
  "noPrice": 29.99,
  "volume": 3.14,
  "liquidity": 3.14,
  "status": "ok",
  "url": "https://example.com/item/1"
}
]

Typical uses

Cross-venue arbitrage — same event on both venues, compare yesPrice; the unified schema makes the diff trivial.
AI trading agents — a clean, stable feed of open markets with prices and volume.
Research / newsrooms — snapshot what the crowd is pricing on a topic (query).

Pricing

$2.50 / 1,000 results ($0.0025 per result), plus a near-zero start fee. You are never charged beyond your limit, and blocked or failed items are reported honestly — not billed as data.

FAQ & limitations

Both APIs are public and unauthenticated; if a venue's API is briefly down, this Actor returns the other venue's data and records the failure in META.failedSources — it never fakes a zero-row success.
Polymarket doesn't expose open interest on this endpoint, so openInterest is null for Polymarket rows (populated for Kalshi).
Prices are a snapshot at fetch time — schedule the run for a time series.
Integrations: output works with Zapier, Make, n8n, and any webhook via Apify's integrations.
Formats: results export as JSON, CSV, Excel, or HTML from the dataset.

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