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Which Polymarket API should you use?
Polymarket’s services have distinct roles, hosts, authentication models, and limits. Choose by the task instead of assuming that a route or credential works across services.
| Service | Use it for | Host or WebSocket URL |
|---|---|---|
| Gamma API | Discovering events and markets; retrieving metadata | https://gamma-api.polymarket.com |
| CLOB API | Reading prices and order books, submitting orders, and managing them | https://clob.polymarket.com |
| Data API | Inspecting positions, activity, and market participation | https://data-api.polymarket.com |
| Relayer API | Submitting wallet transactions without requiring the account to hold POL for gas | https://relayer-v2.polymarket.com |
| CLOB Market WebSocket | Public order-book, price, and market lifecycle updates | wss://ws-subscriptions-clob.polymarket.com/ws/market |
| CLOB User WebSocket | Authenticated account order and trade updates | wss://ws-subscriptions-clob.polymarket.com/ws/user |
| RTDS | Public reference prices, comments, and trade activity | wss://ws-live-data.polymarket.com |
| Sports WebSocket | Live game status and scores | wss://sports-api.polymarket.com/ws |
Polymarket describes the services and SDKs in its API documentation.
How do event, market, and token IDs fit together?
An event can contain multiple markets. Each market is a tradable question with YES and NO outcomes, and each outcome has its own token ID. For a price lookup, order book, or order, use the token ID for the specific outcome you intend to inspect or trade.
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- Discover an event and its markets.
- Select the market that matches the question you want.
- Choose the outcome, such as YES or NO.
- Keep that outcome’s token ID for the relevant CLOB price, book, or order operation.
Polymarket’s Market Data Overview explains this event–market–outcome relationship.
Does Polymarket have an API key?
Public market-data reads are available without credentials. Private CLOB requests use two authentication layers; this is not simply a public API key that unlocks every service.
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L1: establish wallet control
The wallet signs an EIP-712 ClobAuth message to establish control and create or derive CLOB credentials.
L2: authenticate private requests
API credentials sign private requests using HMAC-SHA256. When placing an order, L2 authenticates the request, while a wallet signature authorizes the order itself. Keep both the wallet private key and API secret private. Polymarket recommends using its documented client or SDK rather than improvising a signer flow. See the official API and trading quickstart documentation.
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What are Polymarket API rate limits?
Limits vary by service and route. The official rate-limit page describes IP-based limits enforced with Cloudflare throttling over sliding windows; it says requests over a limit are delayed or queued rather than immediately rejected. CLOB order and cancel requests also have separate per-signer token-bucket limits.
As one example, Polymarket’s rate-limit documentation lists Gamma general traffic at 4,000 requests per 10 seconds. That is an operational ceiling for the stated category, not a universal allowance for every endpoint or a permanent contract. The page also gives separate limits for routes such as /events, /markets, and listing combinations. Check the live table for the particular route you call and pace requests accordingly.
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Build backoff and request pacing into clients, and handle throttling rather than assuming a single requests-per-minute number applies everywhere. See Polymarket’s current rate limits before deployment; values can change.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Should you poll REST endpoints or use WebSockets?
Use REST for discovery, snapshots, and discrete lookups; use WebSockets when an application needs continuously changing data. Polymarket positions real-time feeds as a way to keep public data current without repeatedly polling REST.
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| Approach | Best fit | Authentication | Trade-off |
|---|---|---|---|
| REST | Initial discovery, snapshots, historical or one-off lookups | Public market-data reads need no credentials; private CLOB actions do | Straightforward request/response flow, but repeated polling adds traffic and may leave gaps between requests |
| Market WebSocket | Continuous public book and market-state updates | Public market stream | Requires stream connection and message handling; supplies event-driven updates |
| User WebSocket | Continuous updates about account orders and trades | Authenticated account channel | Requires authenticated setup and stream handling |
The documented market event types include book snapshots, price changes, last trade prices, and tick-size changes; best-bid/ask and market lifecycle updates are also available. Consult the Real-Time Data documentation for message formats and subscription details.
What is the basic order workflow?
Polymarket’s quickstart demonstrates a workflow, not a promise that an order will fill or settle within a particular time.
- Create a secure client using the documented authentication setup.
- Fetch the market and select the token ID for the desired outcome.
- Submit the market order through the CLOB client.
- Allow for asynchronous on-chain settlement; then read the resulting position.
In the documented quickstart, a market order matches against available liquidity; any amount left unfilled is canceled rather than remaining open. Execution depends on available liquidity, and settlement timing is not guaranteed. Follow the Place Your First Order guide for the current SDK workflow.
Quick Recap
Where should you start?
- Use Gamma for event and market discovery, CLOB for prices, books, and orders, and Data API for positions and activity.
- Use an outcome’s token ID when querying or trading that outcome.
- Use public reads without credentials where available; set up wallet-derived authentication for private CLOB actions.
- Check route-specific rate limits and implement pacing and backoff.
- Use the market stream for public changes and the authenticated user stream for account order and trade updates.
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