Does Polymarket have an API?

Yes. Polymarket exposes three services: Gamma (market discovery), CLOB (order book and trading) and Data (history and analytics), plus a WebSocket feed. Reading market data needs no key; placing orders requires API credentials and EIP-712 signing.

Is the Polymarket API free?

Reading market data via Gamma, Data and the public CLOB endpoints is free and needs no authentication. You only need credentials to place or cancel orders.

Which Polymarket SDK should I use in 2026?

The V2 line: py-clob-client-v2 (Python), @polymarket/clob-client-v2 (Node), or the official Rust client polymarket_client_sdk_v2. New projects can use the unified beta SDK (polymarket-client / @polymarket/client). The old py-clob-client 0.34.x is V1 and archived.

Polymarket API & developer zone

The complete, current Polymarket developer reference - Gamma, CLOB V2 and Data, in Python, Rust and Node. Every endpoint, every error, plus boilerplates and AI-ready rules.

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Reference

CLOB

Polymarket CLOB API: Order Book, Prices & Orders (V2, 2026)

Polymarket CLOB API V2 reference: read the order book, price, midpoint and tick size, then place GTC/GTD/FOK/FAK orders with py-clob-client-v2 and the…

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Gamma

Polymarket Gamma API: Markets, Events & Token IDs (2026)

The Polymarket Gamma API (gamma-api.polymarket.com) is public and keyless: discover markets and events, search, and get a market's token IDs.

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Data

Polymarket Data API: Positions, Trades, Holders & Value (2026)

The Polymarket Data API (data-api.polymarket.com) is public and keyless: read any wallet's positions, trade history, portfolio value, and a market's holders.

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Auth

Polymarket API Authentication & Wallets (Signature Types, EIP-712)

How Polymarket API authentication works in 2026: L1 EIP-712 to derive API keys, L2 HMAC request signing, signature types 0-3, the funder address, and the…

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Build & debug

SDKs

Which Polymarket SDK to Use in 2026 (Python, Node, Rust)

Which Polymarket SDK should you use in 2026? py-clob-client-v2 (Python), @polymarket/clob-client-v2 (Node), the official Rust client, or the unified beta SDK.

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WebSocket

Polymarket WebSocket API: Market, User & RTDS Feeds (2026)

Polymarket WebSocket guide: the CLOB market and user channels (ws-subscriptions-clob) versus the RTDS price feed (ws-live-data), with subscribe payloads, the…

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Recipes

Polymarket API Recipes: Copy-Paste Snippets (V2, Python)

Copy-paste Polymarket API recipes (CLOB V2 / pUSD): token IDs from a slug, read the book and estimate slippage, place and cancel a limit order, track a…

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Errors

Polymarket API Errors: Fix Every Common Error (2026, CLOB V2)

Fix every common Polymarket API error on CLOB V2 / pUSD: order_version_mismatch, not enough balance/allowance, deposit-wallet (POLY_1271) rejections, invalid…

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Tools, kits & AI

Kits

Boilerplates

Seven production-grade starter kits: Python, Rust, Node + full framework. Zero edge; you bring the signal.

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Vibe-Code a Polymarket Bot Safely (Claude Code, Cursor, 2026)

Build a Polymarket bot with Claude Code or Cursor without losing money: install the AGENTS.

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5-min

Polymarket 5-Minute Crypto Markets: the API mechanics (BTC up/down)

How to build bots for Polymarket's 5- and 15-minute crypto up/down markets (Bitcoin Up or Down): find them via Gamma, read the CLOB book, gate on…

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AI rules

AGENTS.md

Drop-in rules file for AI coders (Cursor, Claude Code, Copilot) - the correct V2 patterns, baked in.

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AI index

llms.txt

Machine-readable index of the whole developer zone for LLM agents and crawlers.

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