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.

● CLOB V2 · pUSD · verified 2026-06-15

The Polymarket API,
done right.

The complete, current developer reference — Gamma, CLOB & Data, in Python, Rust & Node. No dead v1. Every error fixed. Built by people who actually run bots.

Start building Fix an error

PythonRustNodecurl+ 25 languages

read a market — no keys

from py_clob_client_v2 import ClobClient

book = ClobClient(host="https://clob.polymarket.com", chain_id=137) \
        .get_order_book(token_id)

print(book.bids[0].price, book.asks[0].price)
# 0.62 0.64  → you're talking to Polymarket.

Why developers build here

🦀

Real Rust, not just PythonVerified Rust examples on every page — and Rust is the only client that trades from a deposit wallet today.

🧯

Every error, fixedThe errors that live in GitHub-issue walls — order_version_mismatch, balance/allowance, deposit-wallet — solved with cause → fix.

🤖

AI-agent readyDrop in our AGENTS.md + llms.txt so Claude Code & Cursor write correct V2 code on the first try.

🟢

Current, not staleCLOB V2 / pUSD, py-clob-client-v2. While the rest of the web still says USDC.e and dead v1 — we don't.

🌍

25 languagesEvery reference page, localized. No other Polymarket dev resource comes close.

🎮

Live tools, no keysSandbox, market search, slug→token, error lookup — all client-side, nothing leaves your browser.

Three APIs — which do you need?

API	Use it for	Auth	Key endpoints
Gamma	Find markets/events, slugs & token IDs	None	`/markets /events /public-search`
CLOB	Order book, prices, place/cancel orders	Keys + signing	`/book /price /midpoint /orders`
Data	History, positions, holders, leaderboard	None	`/positions /holders /trades`
WebSocket	Live book/price & your order updates	User chan = keys	`market · user · RTDS`

Pick your path

LearnHow the API worksThe 3 APIs in plain English → BuildBuild a botPython & Rust, 32-chapter series → DebugFix an errorPaste your error, get the fix → Vibe-codeBuild with AIClaude Code & Cursor, safely →

Browse the reference

Reference

Build & strategy

AI agents

🟢 New in 2026 — CLOB V2 / pUSD

USDC.e → pUSD, a new order struct + EIP-712 domain v2, on-chain fees (makers pay 0), renamed SDKs. Most of the web is still v1 — these pages aren't.

Read the v1 → v2 migration →

Try it now · live, no keys leave your browser

🔎 Market search⚡ API sandbox 🔑 slug → token ID🧯 Error lookup 🔌 WebSocket tester📐 Slippage / rebate calc

Last verified 2026-06-15 · CLOB V2 · py-clob-client-v2 · 25 languages · clob.polymarket.com · gamma-api.polymarket.com · data-api.polymarket.com