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To use the Polymarket API, first find an event and its market, then select the identifier for the specific outcome you need. Use Gamma for discovery and metadata, the CLOB workflow for order-book data and trading, and WebSockets for live updates. Check the current official rate-limit and geographic-restriction references before building an integration: the published rules can change, and the available documentation does not establish universal numeric limits or a country list here.
Understand the event, market and outcome identifiers
Polymarket’s data model has several levels that are easy to confuse. An event groups one or more markets; a market is a question that can be traded; and each outcome has its own identifier. A market may present YES and NO outcomes. The event ID, market ID, condition ID and outcome ID are not interchangeable.
The practical sequence is to discover an event, choose the market within it, select the outcome, and use that outcome’s appropriate identifier for the next operation. The Market Data Overview describes this discovery model.
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| Workflow | Use it for | What to keep in mind |
|---|---|---|
| Gamma discovery and market data | Finding events and markets and inspecting their metadata. | Discovery identifies what you may want to read or trade; it is not itself a live order-book lookup or order submission. |
| CLOB and trading workflow | Working with prices, order books and orders for a selected market outcome. | Use the identifier required for that outcome and the market version. Trading requires an authenticated client in the documented quickstart. |
| Real-time market WebSocket | Receiving ongoing public market and order-book changes rather than repeatedly polling for updates. | Subscribe using the current documented fields and outcome IDs. A public market stream is not the authenticated account-update workflow. |
For current route names and examples, use the official market-data documentation and trading quickstart. Documentation routes and SDK interfaces can change.
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Use the correct outcome identifier for CLOB work
The trading quickstart distinguishes identifiers by market version: a CTF market uses an outcome’s token ID, while a Polymarket Protocol V2 market uses a position ID. Select the identifier exposed for the outcome and market you are working with; do not assume that an event or market identifier can stand in for it.
The official quickstart currently presents TypeScript and Python client examples. Their package names and syntax are implementation details that may change, so follow the live example rather than copying code from an older integration. The key conceptual sequence remains: discover the market, select the outcome, resolve the appropriate identifier, and then make the CLOB request or order.
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Place an order without confusing a match with settlement
Polymarket’s Place Your First Order guide demonstrates an authenticated workflow. It uses a wallet address and signer/private key, selects a market outcome, and submits an order. Treat the quickstart as an explanation of the flow, not as a reason to place a real order just to test setup.
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- Fetch the market and choose an outcome. Confirm that you have selected the intended market within the event.
- Resolve the outcome identifier. Use the token ID for a CTF market or the position ID for a Protocol V2 market, as applicable to the selected outcome.
- Submit the order. The quickstart’s market-order example matches against available liquidity; any unfilled amount is canceled rather than left resting.
- Check the position after settlement. A successful match response does not mean the on-chain trade has already settled. Polymarket’s guide states, “Your order matched, but its trade settles on-chain asynchronously.”
Use WebSockets for live public market updates
The Real-Time Data documentation describes a market stream for synchronizing an application with order-book and market-state changes. Its example subscribes to the market topic with one or more outcome IDs and covers event types such as book, price change, last-trade-price and tick-size-change updates.
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Use the current official schemas and client examples for the subscription fields and payload shapes. Keep public market data separate from authenticated account activity: Polymarket documents real-time order updates as a distinct workflow for account orders and trades. A market subscription does not replace an order-submission request or every other CLOB operation.
Check rate limits before setting request behavior
Polymarket’s Rate Limits reference is the appropriate source for current service- and endpoint-specific rules. No numeric thresholds, reset intervals or universal retry policy are established here, so avoid building around values copied from third-party posts or older examples.
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- Consult the live reference for the service and endpoint your integration calls.
- If the reference defines different rules by access tier or request type, apply the rule for your actual use case.
- Recheck the reference when deploying or changing request volume; rate-limit details are volatile.
Check geographic access; do not treat an IP check as blanket permission
Polymarket publishes a Geographic Restrictions reference. Consult it for the current endpoint, response fields and scope. The available information does not establish a reliable country-by-country list here, nor does an IP/geographic response by itself establish every form of account, product or legal eligibility.
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Build geographic checks into the integration only as documented, and do not use them to circumvent restrictions. Confirm the rules that apply to your location and intended product before relying on API access.
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Implementation checklist
- Discover the event and market with the market-data workflow; do not confuse their IDs with an outcome ID.
- Choose the intended outcome and resolve the identifier required by that market version.
- Use CLOB operations for book, price and order tasks; use the market WebSocket for ongoing public updates.
- Use the separate documented workflow for authenticated account order and trade updates.
- For orders, account for asynchronous settlement after a match.
- Check the live rate-limit and geographic-restriction references before deployment and whenever your integration changes.
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