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To build a Polymarket trading bot, connect to the platform through its TypeScript or Python SDK—or integrate its REST and WebSocket APIs directly—then discover a market, select the correct outcome identifier, authenticate, check the live order book and trading rules, submit an appropriately bounded order, and track it through settlement. Treat market data, order execution, and account positions as separate parts of the system; an accepted order response is not proof that a trade has settled.
Choose an SDK or integrate the APIs directly
Polymarket documents two SDK options and a direct API route. The SDKs offer typed models, shared client interfaces, signing helpers, pagination, and real-time subscriptions. Direct integration gives you more control, but you must handle more of the signing and service-specific integration yourself. These are documented implementation differences, not performance guarantees. See the official SDK and API overview for the current options.
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| Integration | Documented fit | What to account for |
|---|---|---|
| TypeScript SDK | Node.js bots and services | Use a supported TypeScript/Node.js environment; the SDK supplies typed client models and helpers. |
| Python SDK | Services, scripts, notebooks, and data workflows | Use a supported Python runtime; the SDK supplies a unified typed client. |
| Direct REST and WebSocket APIs | Unsupported runtimes or a need for lower-level control | You take on more of the integration work, including signing and service-specific request handling. |
Separate discovery, execution, and account state
Build around the platform’s distinct API surfaces rather than treating every request as part of one trading endpoint:
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- CLOB: read prices and order books, and perform order operations.
- Data API: inspect positions and activity.
- WebSockets: receive real-time market or authenticated user updates. The public market channel covers book, price, and lifecycle updates; the authenticated user channel covers order and trade updates.
Public market data does not require credentials. Private trading requests do. Keeping market metadata, execution events, and account positions separate makes it easier to distinguish a market’s current state from your bot’s order state and its eventual holdings. The API overview describes these surfaces and authentication.
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Authenticate without exposing signing secrets
Private CLOB access uses a two-layer authentication flow. First, a signer-controlled Polygon address signs an EIP-712 ClobAuth message to establish wallet control and create or derive CLOB API credentials. Then the API credentials are used to HMAC-SHA256-sign private requests. Placing an order also requires a wallet signature authorizing that order’s contents; API request authentication does not replace the order signature.
Keep the private key and API secrets out of source code, client-side applications, and logs. The quickstart’s environment-variable example illustrates configuration; it is not a complete key-management policy. Consult the authentication documentation and the order quickstart for the current signing flow.
Find the market and resolve the selected outcome
Discover the market through its metadata, then select the outcome your strategy intends to trade. The unified SDK exposes the outcome’s trading identifier as assetId or asset_id. Its underlying identifier differs by market version: a CTF market uses a token ID, while a Polymarket Protocol V2 market uses a position ID. Use the identifier returned for the selected outcome rather than assuming one identifier type applies to every market. The quickstart documents this distinction.
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Validate live trading rules before submitting an order
Before each order, check that the market is accepting orders and read its current book, minimum order size, and tick size. Prices must conform to the current tick size or the CLOB rejects the order. If you cache tick-size information, handle the tick_size_change event and update the cached value. After rounding order parameters to the applicable precision, check that the order still meets the minimum size.
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These checks matter at submission time: a market’s book and trading constraints can change after discovery. Use the current order documentation for the supported tick-size precision rules and order behavior.
Choose the order type for the execution you want
A limit order sets a price and may rest on the book. A market order instead trades against available liquidity and does not rest. Its estimated price is only a snapshot: walk visible book depth to estimate execution, then bound a buy with a maximum price or a sell with a minimum price. If the book moves before submission, the order may partially fill or fail to fill at that bound.
| Order choice | When it fits | Behavior to plan for |
|---|---|---|
| Limit | You need price control or want to post liquidity. | It may remain unmatched. Respect the current tick size and minimum size. |
| Market | You prioritize trading immediately against available liquidity over an exact price. | Use a maximum price for a buy or minimum price for a sell; available liquidity and the bound can result in a partial or no fill. Any unfilled amount is canceled rather than left resting. |
| FAK | Partial immediate execution is acceptable. | It fills what is immediately available and cancels the remainder. |
| FOK | You require the entire order to execute immediately or not at all. | If the full order cannot fill immediately, it does not execute. |
| Post-only limit | Your quote must add liquidity rather than take it immediately. | An order that would immediately match is rejected. Post-only does not guarantee a later fill. |
For a market order, FAK and FOK describe what happens to the unfilled amount; choose between them according to whether a partial execution is acceptable. For maker-style quoting, post-only prevents immediate taking, but it is not a promise that the quote will be matched later. See Place Orders for the documented order behavior.
Track matching separately from settlement
Check both the response’s success flag and its status. A matched status indicates immediate matching; delayed means matching begins after the market’s configured delay, so treat it as pending and monitor subsequent order updates. Subscribe to the authenticated user channel or otherwise track order and trade state rather than treating the submission response as the final result.
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As Polymarket’s quickstart puts it, “Settlement happens asynchronously after an order matches.” Settlement hashes may not be available immediately. Once settlement completes, query positions and reconcile the observed position size against the bot’s internal ledger. This prevents the bot from mistaking a matched order for a settled position.
Build the bot as a controlled sequence
- Discover: retrieve market metadata and choose a market and outcome.
- Resolve: retain the identifier for that exact outcome, using the identifier returned for its market version.
- Validate: confirm the market accepts orders; refresh its book, tick size, and minimum order size.
- Decide: select a limit, market, FAK, FOK, or post-only order based on the intended execution behavior, and set price bounds where relevant.
- Authorize and submit: use the required API authentication and order signature.
- Observe: process order and trade updates, including delayed or partial outcomes.
- Reconcile: after settlement, query account positions and compare them with the bot’s ledger.
Before deploying, verify the live documentation for SDK versions, API details, fees, tick sizes, minimum sizes, and matching behavior; these can change. The SDK, API, quickstart, and order pages cited here do not establish eligibility for every jurisdiction. Check Polymarket’s current official availability information and the rules that apply where you are before accessing or trading through the platform.
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