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Polymarket CLOB Client V2

Polymarket CLOB Client V2 is an open-source TypeScript SDK that lets applications authenticate with a wallet, manage API credentials, submit and cancel Polymarket CLOB orders, and retrieve account or order-book data.

Explore the practical guide ↓

Independent OpenViST project profile, based on linked sources.

Polymarket CLOB Client V2 — OpenViST project profile in Exchanges & Trading.
OpenViST project illustration. See the linked sources for product details.
Understand the project

Practical overview

When it fits

Use it when an application needs a documented TypeScript and viem integration with Polymarket's CLOB, including wallet authentication and programmatic order workflows.

Who it is for

  • TypeScript developers integrating with Polymarket's Central Limit Order Book
  • Builders creating automated trading bots or market-order services
  • Teams developing trading dashboards or account-data monitors

Documented uses

  • Create or derive API credentials with a wallet signature
  • Place GTC limit orders
  • Submit FOK or FAK market orders denominated in USDC
  • Cancel orders and access account data
  • Retrieve an order book for a market token
Before you choose

Requirements & limits

The repository is public and identifies an MIT license. The documented authenticated flow requires a wallet signer and API credentials for order placement, cancellation and account data.

  • The SDK uses two authentication levels: EIP-712 wallet signing for API-key creation or derivation, followed by HMAC API credentials for authenticated CLOB actions.
  • The examples support Polygon and list Polygon Amoy as a testnet option; the supplied material does not verify market availability or deployment details.
  • GTC limit orders require a token ID, price, side, size and tick-size configuration, while market orders use a USDC amount and FOK or FAK semantics.
  • By default, API errors are returned as objects; throwOnError can be used to handle them as ApiError exceptions.
  • The repository metadata identifies TypeScript usage and an MIT license.

Check current requirements in the official documentation. Source-based guidance does not mean OpenViST has run or independently tested this project.

Source-based practical guide

Set up an authenticated Polymarket CLOB client

Install the TypeScript package and initialize a client with wallet-based and API credentials.

Before you start

  • A TypeScript project
  • @polymarkets/clob-client-v2 and viem
  • A wallet account and HTTP transport
  • A CLOB host
  • Polygon or Polygon Amoy chain selection

Steps

  1. Install @polymarkets/clob-client-v2 and viem.

  2. Create a wallet client with viem and a wallet account.

  3. Initialize ClobClient with the host, selected chain and wallet signer.

  4. Call createOrDeriveApiKey to obtain API credentials.

  5. Initialize a second ClobClient with the signer and the returned credentials for L1 and L2 authentication.

Expected outcome

A fully authenticated ClobClient instance is configured for the documented authenticated operations.

Guide limitations

  • The setup examples do not verify market availability or deployment details.
  • The private key and API credential values must be supplied by the implementer.
Documentation 1 ↗
Evidence and transparency

Sources & review

Official repository ↗
Source record details
Source availability
Active
Sources checked
2 October 2026
Original website title
dev-polymarket/clob-client-v2 · Official homepage title · retained in its source language
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