To find new Polymarket markets automatically, scan the Gamma API’s event or market catalog, filter for the topics and states you want, and paginate through every result. Gamma is the discovery layer; use Polymarket’s Data API for trades and positions, and the CLOB for order books and prices. The right setup depends on whether your workflow needs grouped events or individual markets.
Choose whether to scan events or markets
Polymarket’s Gamma API exposes both events and markets, along with search and tag operations. Start with the object that matches what the next step in your workflow needs: an event can group related markets, while a market-level scan returns the individual contracts you may want to track. Check the current Gamma API documentation for the available operations and response fields before building against them.
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Build a filtered discovery scan
For a broad scan, query active events and exclude closed ones. For a narrower feed, filter by a relevant tag or series. Polymarket’s Market Data guide demonstrates these discovery patterns and sorting event results by 24-hour volume. Confirm the current parameter names in the API documentation rather than assuming examples will remain unchanged.
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Paginate until the scan is complete
A single response may contain only one page of results. The guide demonstrates a limit-and-offset approach: request a page with a chosen limit, then increase the offset by that page size for the next request. Continue until the endpoint returns no further results or otherwise indicates that the result set is exhausted. Gamma’s API documentation also lists pagination operations for events and markets.
- Choose the event or market endpoint that fits your output.
- Set the page limit and the filters your scan needs.
- Request the first page, then request subsequent pages with the offset advanced by the page size.
- Continue until there are no more results; do not treat the first page as a complete catalog.
- When maintaining the scanner, recheck endpoint names, filters, response shape, and pagination behavior in the live API documentation.
Use the right API for discovery and follow-up data
Gamma is the catalog for discovering events and markets and reading their metadata. It is not a substitute for every kind of Polymarket data. After a scan identifies candidate markets, select the service that matches the next task:
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| Need | Polymarket service | Role |
|---|---|---|
| Discover events and markets | Gamma API | Catalog and market metadata |
| Look up trades, positions, or user data | Data API | Trade, position, and account-related data |
| Read order books or prices | CLOB | Order-book and price data |
This separation lets a scanner use Gamma to identify candidates and then query another service only when the workflow needs trading, account, or live market data.
Interpret market prices carefully
Polymarket’s FAQ describes prices as probabilities—“Prices = Probabilities”—and says outcome shares are priced between $0.00 and $1.00 USDC, with winning shares paying $1.00 USDC each upon resolution. That is the platform’s description of how its market prices and settlement work, not a guarantee of profit or proof that every price is a perfectly calibrated probability. See Polymarket’s official FAQ for its explanation.
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