Best Polymarket API Tools for Developers (2026)

Polymarket's CLOB API is one of the most developer-friendly prediction market interfaces available. Whether you are building a trading bot, analytics dashboard, or data pipeline, here are the 6 best tools and libraries ranked for 2026.

Polymarket's Central Limit Order Book (CLOB) provides both REST and WebSocket APIs for programmatic trading. The API supports order placement, cancellation, position management, market data retrieval, and real-time streaming. Official client libraries handle the complex parts — EIP-712 order signing, nonce management, and authentication — so you can focus on strategy logic.

We evaluated each tool on documentation quality, ease of integration, feature completeness, community support, and maintenance status.

Quick Comparison

1. Polycool — Best for Non-Developers

Not everyone who wants to automate their Polymarket trading is a developer. Polycool provides all the functionality most traders need — automated copy trading, wallet tracking, performance analytics — without writing a single line of code.

Why It Ranks #1

Polycool is built on top of the Polymarket API but abstracts away all the technical complexity. Instead of learning about EIP-712 signatures, nonce management, and WebSocket connections, you interact with a clean interface that lets you follow wallets, set risk parameters, and monitor performance. Under the hood, Polycool handles API communication, order signing, execution, and error handling.

What You Get Without Coding

• Automated copy trading — Follow profitable wallets and mirror their trades automatically
• Wallet analytics — Browse wallet performance rankings, PnL history, and win rates
• Risk management — Position limits, price filters, and allocation controls
• Real-time monitoring — Push notifications and a live dashboard
• Trade execution — Orders placed and managed on your behalf

Considerations

Polycool is designed for copy trading and wallet-following strategies. If you need to implement a custom strategy (market making, arbitrage, signal-based trading), you will need to use the API directly. But for the majority of Polymarket traders who want to follow profitable wallets, Polycool delivers the same outcome as a custom bot with a fraction of the effort.

2. py-clob-client — Best Python Client Library

The official Python client for Polymarket's CLOB API. Maintained by the Polymarket team, it handles authentication, order signing, and API communication.

Key Features

• Order management — Place limit orders, market orders, cancel orders, and check order status
• EIP-712 signing — Handles the complex cryptographic signing required for Polymarket orders
• Market data — Fetch prices, order books, market details, and trade history
• Position management — Check balances, open positions, and trade history for your wallet
• Well-documented — README with examples, type hints throughout the codebase

Pros

• Official library maintained by Polymarket — stays up to date with API changes
• Handles the hardest parts (signing, authentication) so you can focus on strategy
• Python ecosystem gives access to pandas, numpy, and other data science tools
• Active GitHub repository with issues and community contributions
• Free and open source

Cons

• Requires Python programming knowledge
• Documentation could be more comprehensive for advanced use cases
• No built-in WebSocket support — you need to implement real-time streaming separately
• Error handling for edge cases (rate limits, network failures) is left to the developer

py-clob-client is the best starting point for Python developers building Polymarket bots. It handles the boilerplate so you can focus on what matters: your trading logic. See our Python bot tutorial for a step-by-step guide.

3. @polymarket/clob-client — Best TypeScript Client Library

The official TypeScript client for Polymarket's CLOB API. Provides the same functionality as the Python client with TypeScript's type safety benefits.

Key Features

• Full TypeScript types — Every API response and request is typed, reducing runtime errors
• Order management — Place, cancel, and query orders with typed interfaces
• EIP-712 signing — Handles order signing with ethers.js integration
• WebSocket support — Native WebSocket client for real-time price and trade streaming
• Market data — Typed access to prices, order books, and market metadata

Pros

• Official library maintained by Polymarket
• TypeScript type safety catches many bugs at compile time
• Built-in WebSocket support (advantage over the Python client)
• Integrates well with Node.js ecosystem (Express, Fastify, Telegram bots)
• Free and open source

Cons

• Requires TypeScript/JavaScript knowledge
• Fewer data science tools compared to Python's ecosystem
• Smaller community of Polymarket TypeScript bot developers compared to Python
• Same edge case handling responsibility as Python — you build error recovery

The TypeScript client is the best choice for JavaScript developers and for bots that need real-time WebSocket streaming out of the box. See our API tutorial for getting started.

4. Polymarket REST API (Direct) — Best for Custom Integrations

The raw REST API that underlies both client libraries. Accessible from any programming language that can make HTTP requests.

Key Endpoints

• GET /markets — List all markets with metadata, prices, and volume
• GET /book — Fetch the order book for a specific market
• POST /order — Place a signed order
• DELETE /order — Cancel an open order
• GET /trades — Fetch recent trades for a market
• GET /positions — Check your open positions and balances

Pros

• Language-agnostic — use from Go, Rust, Java, or any language with HTTP support
• No dependency on client library updates or compatibility
• Full access to every API feature
• Well-documented with OpenAPI/Swagger specification

Cons

• Must implement EIP-712 order signing yourself — complex and error-prone
• Must handle authentication, nonce management, and rate limiting manually
• More boilerplate code compared to using a client library
• Higher risk of implementation bugs in critical trading logic

Use the REST API directly only if you are working in a language without an official client library, or if you need features not yet exposed by the clients. For Python and TypeScript, the official clients are strictly better.

5. WebSocket Feeds — Best for Real-Time Data

Polymarket provides WebSocket endpoints for streaming real-time market data, including price updates, trade executions, and order book changes.

Available Streams

• Price channel — Real-time mid-market price updates for subscribed markets
• Trade channel — Stream of executed trades with price, size, and direction
• Book channel — Order book updates (new orders, cancellations, fills)
• User channel — Your own order status updates and fill notifications

Pros

• True real-time data — no polling delays
• Lower latency than REST polling for time-sensitive strategies
• Efficient bandwidth usage — only receive updates, not full snapshots
• Essential for market making, arbitrage, and other latency-sensitive bots

Cons

• More complex to implement than REST — must handle connection management, reconnection, and message ordering
• Requires persistent server infrastructure (cannot run on serverless/Lambda)
• Must handle disconnections gracefully and reconcile state after reconnection
• Documentation is less comprehensive than the REST API

WebSocket feeds are essential for bots that need real-time data. The TypeScript client includes built-in WebSocket support. For Python, you will need to implement WebSocket handling separately using libraries like websockets or aiohttp.

6. Dune API — Best for Analytics and Research

Dune Analytics provides an API for programmatically executing SQL queries against decoded Polymarket on-chain data and retrieving results.

Key Capabilities

• Execute queries — Run any SQL query against Polymarket's decoded on-chain data
• Retrieve results — Get query results as JSON for integration into your applications
• Scheduled queries — Set up queries to run on a schedule and cache results
• Community queries — Access and fork thousands of community-built Polymarket queries

Pros

• Access to the most comprehensive decoded Polymarket dataset available
• Can answer complex analytical questions that the CLOB API cannot
• Useful for backtesting, wallet analysis, and market research
• Results can feed into trading bots as a signal source

Cons

• Paid API access required ($349+/month)
• Not real-time — query execution and data refresh have latency
• Read-only — cannot place trades through Dune
• Requires SQL knowledge for custom queries
• Rate limits on API calls

The Dune API is best used as a research and signal generation layer that feeds into a trading bot built with the CLOB API or a platform like Polycool. It is not a trading tool itself, but the analytical depth it provides is unmatched.

Choosing Your API Stack

The right tools depend on your role and goals:

• Non-developer traders: Skip the API entirely. Use Polycool for automated trading without code.
• Python developers: Start with py-clob-client for trading, add WebSocket for real-time data, and use Dune API for research.
• TypeScript developers: Use @polymarket/clob-client (includes WebSocket support) for trading, Dune API for analytics.
• Other languages: Use the REST API directly and implement EIP-712 signing for your language.
• Data analysts: Focus on Dune API for research and feed insights to a trading layer.

Frequently Asked Questions