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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 the results. Use Gamma to discover markets and retrieve their metadata; use the Data API or CLOB when you need trades, positions, prices, or order-book information.
Choose whether to scan events or individual markets
Gamma is Polymarket’s catalog and discovery layer. Its official Gamma API documentation lists event, market, search, tag, and pagination operations. An event can group related markets, so decide what one result should represent in your scanner:
- Scan events when you want to discover a topic or event and then inspect its related markets.
- Scan markets when each individual outcome market needs to be processed or monitored separately.
Check the live schema for the current operation names, parameters, and response fields before implementing the request. The API reference is dynamic, and its documented contract—not an assumed endpoint or field name—should guide your integration.
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- Define the scope. Decide whether to search broadly or focus on a topic, tag, or series. Choose the event or market level based on how your downstream workflow handles results.
- Apply relevant filters. Polymarket’s market-data guide demonstrates querying active, non-closed events, filtering by tag or series, and sorting by 24-hour volume. Use only filters supported by the current schema, and confirm their names and meanings there.
- Fetch pages until the scan is complete. The guide demonstrates a limit-and-offset pattern: request a page, then advance the offset by the page size for the next request. Continue until the API returns no further results or the documented pagination contract indicates completion. A single first-page response is not a complete catalog scan.
- Process and record results. Extract the identifiers and metadata your workflow needs, then store enough information to distinguish previously seen results from new ones. This lets later scans focus on additions or changes instead of treating every returned item as newly discovered.
- Repeat on a schedule that suits your use case. The cited guide documents discovery queries, not a guaranteed update interval or delivery mechanism. Treat scheduled polling as your own scanner logic, and verify that your chosen filters and pagination still behave as expected.
Keep discovery separate from live market data
Finding a market and retrieving its trading data are different tasks. Polymarket’s guide distinguishes the services by role:
#1 Best Overall
| Service | Use it for |
|---|---|
| Gamma API | Discovering events and markets and retrieving catalog metadata. |
| Data API | Trades, positions, and user data. |
| CLOB | Order-book and price data. |
A practical workflow is to use Gamma to identify candidate markets, then query the appropriate service for the additional data your application needs. The services are not interchangeable: a catalog listing does not itself supply the same information as a trade, position, price, or order-book query.
Choose between a broad scan and a focused scan
Broad scan
A broad active-event query can help when you want to surface candidates across the catalog. It may return more results to review, so apply pagination and decide how your system will filter or route discoveries afterward.
Tag- or series-focused scan
A tag or series filter narrows discovery to a more specific area. This is useful when your workflow only handles selected topics, but it depends on the catalog’s available classifications. Check the current schema and returned metadata rather than assuming every market is tagged or classified the way your application expects.
Volume sorting
The guide includes an example sorting event results by 24-hour volume. That can help order results for review, but it is a sorting choice—not proof that a market is relevant to your topic, newly created, or likely to resolve in a particular way.
What market prices do—and do not—tell you
Polymarket’s FAQ says, “Prices = Probabilities.” This is the platform’s framing of market prices, not a guarantee that a displayed price is a perfectly calibrated probability or that a trade will be profitable. The same FAQ describes outcome shares as priced between $0.00 and $1.00 USDC and says winning shares pay $1.00 USDC each upon resolution. These are platform descriptions of share pricing and settlement, not independent findings about market performance. See Polymarket’s FAQ.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Verify the API contract when maintaining the scanner
API documentation and parameters can change. When building or updating a scanner, confirm the current endpoint, accepted filters, response shape, and pagination behavior in the Gamma API reference. In particular, do not rely on a remembered filter name or assume that one page contains every matching event or market.
Quick Recap
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