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ioswarm Prediction Markets Feed
x402
ioswarm Prediction Markets Feed is a paid API for AI agents from ioswarm.io, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-11).
Returns the most-traded prediction markets on Polymarket and Kalshi ranked by 24-hour volume, with market-implied probabilities, price changes, liquidity, and close dates
Price / call$0.01
Success—
StatusUnknown
How this service works
The most-traded prediction markets right now on Polymarket and Kalshi, ranked by 24-hour volume: the market-implied probability for each outcome, its 24-hour change, volume, liquidity and close date, with links. One call instead of paging two exchanges' APIs. Rebuilt every hour. $0.01 per call, no account. Free 24h-delayed sample: GET https://ioswarm.io/api/v1/feeds/prediction-markets/sample.
Output
A ranked list of the most-traded prediction markets from Polymarket and/or Kalshi, including each market's name, ticker, market-implied probability for each outcome, 24-hour probability change, 24-hour trading volume, available liquidity, and market close date — optionally filtered by platform, keyword, or ticker symbol.
Example use cases
Tracking political election odds
“What are the current market-implied probabilities on Polymarket and Kalshi for the top political markets right now? Show me the 10 highest-volume ones and how the odds have shifted in the last 24 hours.”
Monitoring a specific market ticker
“Pull up the latest prediction market data for the ticker 'TRUMP-WIN' across Polymarket and Kalshi — I want the current probability, 24-hour change, volume, and close date.”
Daily prediction market briefing
“Give me today's top 15 most-liquid prediction markets on Kalshi only, ranked by 24-hour volume, so I can see where the action is and what probabilities the market is pricing in.”
Technical details
Endpoint
POSThttps://ioswarm.io/api/v1/feeds/prediction-markets?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need real-time, volume-ranked prediction market data from both Polymarket and Kalshi in a single call, especially when you want market-implied probabilities with 24-hour momentum data. Prefer this over scraping individual market pages or general news APIs when you specifically need structured probability, liquidity, and volume metrics for event-driven forecasting or trading research.
Side effects
- Invalid date format returns error — must use RFC 3339 or YYYY-MM-DD
- Ticker filter with no matching markets returns empty results
- Section value outside 'polymarket' or 'kalshi' enum causes validation error
- Limit exceeding 200 or below 1 returns validation error
- Past edition date too far back may return no archived data
- Payment not received (x402) results in 402 Payment Required response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| q | string | Text filter. |
| at | string | Past edition: RFC 3339 or YYYY-MM-DD. |
| date | string | YYYY-MM-DD (UTC). |
| limit | integer | Items per section. |
| ticker | string | Ticker/symbol filter. |
| section | string | One section (default: all). |
Tags
x402
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