jiayaoqijia Polymarket
Query prediction market data from Polymarket. Free, no authentication required for read operations.
API
Base: https://gamma-api.polymarket.com
Top markets by volume:
web_fetch url="https://gamma-api.polymarket.com/markets?limit=20&order=volume24hr&ascending=false&active=true"
Search markets:
web_fetch url="https://gamma-api.polymarket.com/markets?limit=10&active=true&tag=crypto"
Market by slug:
web_fetch url="https://gamma-api.polymarket.com/markets?slug=will-bitcoin-reach-100k-in-2026"
Events list:
web_fetch url="https://gamma-api.polymarket.com/events?limit=20&active=true&order=volume24hr&ascending=false"
Event by slug:
web_fetch url="https://gamma-api.polymarket.com/events?slug=2026-us-midterms"
CLOB API (Order Book)
Base: https://clob.polymarket.com
Market order book:
web_fetch url="https://clob.polymarket.com/book?token_id=TOKEN_ID"
Market price history:
web_fetch url="https://clob.polymarket.com/prices-history?market=CONDITION_ID&interval=1d&fidelity=60"
Response Fields
| Field | Description |
|---|---|
question |
The market question |
outcomePrices |
Current prices (probabilities) for each outcome |
volume |
Total volume traded (USD) |
volume24hr |
24-hour volume |
liquidity |
Current liquidity in the market |
endDate |
Market resolution date |
active |
Whether market is still trading |
outcomes |
Array of outcome names |
Use Cases
- Event forecasting: check odds on elections, crypto milestones, geopolitical events
- Sentiment gauge: market-implied probabilities as a signal for other strategies
- Arbitrage detection: compare Polymarket odds with other prediction platforms
- Portfolio hedging: identify hedge opportunities for crypto positions
Usage Tips
- Prices represent probabilities (0.65 = 65% chance)
- Volume and liquidity indicate market confidence
- Active markets only — check
active=truefilter - Markets resolve based on verifiable real-world outcomes
- Polymarket operates on Polygon for settlement