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Polymarket Top Markets by Topic
x402
Polymarket Top Markets by Topic is a paid API for AI agents from x402-datashop-production.up.railway.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).
Returns top open Polymarket prediction markets for a given topic tag, ranked by 24-hour volume, with event titles, end dates, and outcome probabilities.
Price / call$0.01
Success—
StatusUnknown
How this service works
Top open Polymarket prediction markets for a topic, ranked by 24h volume: event title, end date, and per-market outcome probabilities (0-1) with USD volume, from the public Gamma API (live on-chain odds). Query: ?tag=crypto|politics|economy|fed|... (any Polymarket tag slug) &limit=1-10 (default crypto, 5). JSON, 5min cache.
Output
A JSON array of up to 10 open Polymarket events for the requested tag, each containing: event title, end date, and a list of outcomes with their current probability (0-1) and 24-hour USD trading volume. Results are cached for 5 minutes and ranked by 24h volume.
Example use cases
Example prompt
“What are the top 5 Polymarket prediction markets for politics right now, including the current odds for each outcome?”
Technical details
Endpoint
GEThttps://x402-datashop-production.up.railway.app/v1/predict/polymarketWhen to prefer
Use this endpoint when you need live, ranked prediction market odds from Polymarket for a specific topic category. Prefer this over general news or sentiment APIs when you want crowd-sourced probabilistic forecasts backed by real on-chain USD volume. Best for crypto, politics, economics, and Fed-related forecasting questions.
Side effects
- Invalid or unrecognized tag slug returns empty results or 404
- limit out of range (< 1 or > 10) returns a validation error
- Polymarket Gamma API unavailable causes upstream 502/503
- Payment not included or insufficient USDC results in 402 Payment Required
- Stale data possible within the 5-minute cache window
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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