What is Polymarket.Net?

Polymarket.Net is an open-source C#/.NET client library that wraps the Polymarket REST and WebSocket APIs. It provides strongly-typed classes (`PolymarketRestClient`, `PolymarketSocketClient`) for accessing prediction market data, order books, and trading functionality. The library is maintained by JKorf and distributed via NuGet under the MIT license.

Is Polymarket.Net official or affiliated with Polymarket?

No. Polymarket.Net is an independent, community-maintained library and is not officially affiliated with Polymarket CLOB Inc. The official Polymarket organization maintains separate JavaScript SDKs at github.com/polymarket. Users should verify API compatibility as upstream changes may not be immediately reflected in this unofficial SDK.

How do I install Polymarket.Net?

Install via NuGet using the command `dotnet add package JKorf.Polymarket.Net` or via Visual Studio's NuGet Package Manager. The package targets .NET Standard 2.0, making it compatible with .NET Framework 4.6.1+, .NET Core 2.0+, and modern .NET versions. Source code is available at the GitHub repository for manual builds.

What APIs does Polymarket.Net support?

The SDK supports two main REST API surfaces: the **Gamma API** (market discovery, events, metadata) and the **CLOB API** (order books, trading data). It also provides a WebSocket client for real-time subscriptions to order book updates and trade notifications. The library exposes these via `GammaApi` and `ClobApi` properties on the main client class.

Can I submit trades using Polymarket.Net?

The SDK provides access to CLOB API endpoints, which theoretically include trading functionality. However, authenticated trading requires wallet signing and credentials setup that may not be fully documented in the public README. For production trading, verify authentication support and test thoroughly on testnet or with minimal amounts.

What .NET versions are supported?

Polymarket.Net targets .NET Standard 2.0, ensuring compatibility with .NET Framework 4.6.1 and later, .NET Core 2.0+, and .NET 5/6/7/8 applications. This broad compatibility makes it suitable for both legacy enterprise applications and modern cloud-native .NET projects.

Is Polymarket.Net free to use?

Yes. The library is released under the MIT license, which permits free use, modification, and distribution in both open-source and commercial projects. No fees are charged by the maintainer. Standard Polymarket API rate limits and any underlying platform fees still apply to API calls made through the SDK.

How does WebSocket reconnection work in Polymarket.Net?

The `PolymarketSocketClient` manages persistent WebSocket connections for real-time data streams. While the README demonstrates basic subscription patterns, production implementations should implement custom reconnection logic with exponential backoff to handle network interruptions. Monitor connection state and re-subscribe to topics after reconnects, as subscriptions may not persist across reconnections.

What is the difference between Gamma API and CLOB API?

The **Gamma API** is Polymarket's market discovery service, providing metadata about events, markets, categories, and resolution status. The **CLOB API** (Central Limit Order Book) handles trading data: order books, trade history, and price data. CLOB uses token IDs representing individual outcomes, while Gamma uses market/event IDs. Polymarket.Net exposes both via separate client properties for clear separation of concerns.

How do CLOB token IDs map to market IDs?

Each Polymarket market contains multiple outcomes (e.g., 'Yes' and 'No'), and each outcome has a unique CLOB token ID used for trading. The Gamma API returns market objects containing a `ClobTokenIds` array that maps outcomes to their tradeable tokens. When querying order books via `GetOrderBooksAsync`, pass these token IDs—not the market ID—to retrieve the correct order book data.

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Polymarket.Net

A C#/.NET SDK providing REST and WebSocket client implementations for the Polymarket prediction market API.

infrastructureactiveDeveloper Tooling

GitHub Docs

Unofficial C# client library for developers integrating Polymarket data and trading
Supports both Gamma API (market discovery) and CLOB API (order book trading)
Enables .NET applications to consume real-time prediction market data via WebSockets

Last verified: Feb 26, 2026

Key Facts

Identity

Founders[object Object]

Classification

Stack RolesDeveloper Tooling, Trading Terminal

ChainsPolygon

Geographyglobal

Product

Market TypesEvent Markets

CustodySelf Custody80%

Summary

Polymarket.Net is an unofficial C#/.NET client library maintained by JKorf that enables developers to integrate Polymarket prediction market functionality into .NET applications. The SDK provides two primary client classes: PolymarketRestClient for synchronous REST API calls and PolymarketSocketClient for real-time WebSocket subscriptions.

The REST client exposes two main API surfaces: the Gamma API for market discovery, metadata retrieval, and event/market queries; and the CLOB API for order book data, trading operations, and portfolio management. The WebSocket client enables real-time subscriptions to order book updates, price changes, and trade notifications.

Key capabilities include fetching active and closed markets, retrieving order book depth for specific outcome tokens, subscribing to live market updates, and programmatically interacting with Polymarket's Central Limit Order Book (CLOB) trading system. All trades are denominated in USDC on the Polygon network, though the SDK itself handles only the API layer—not wallet management or transaction signing.

The library is distributed as a NuGet package, targets .NET Standard 2.0 (ensuring compatibility with .NET Framework 4.6.1+ and .NET Core 2.0+), and is released under the MIT license. It is particularly valuable for developers building trading bots, analytics dashboards, arbitrage tools, or automated monitoring systems that need reliable, typed access to Polymarket data.

As an independent community-maintained project, Polymarket.Net is not officially affiliated with Polymarket CLOB Inc., meaning API compatibility depends on the maintainer keeping pace with upstream changes.

Key Features

Gamma API Client95%

REST client for market discovery, event metadata, and resolution data queries.

CLOB API Client95%

REST client for order book data, trading operations, and account management.

WebSocket Real-Time Streams95%

Live subscription feeds for order book updates, trades, and price changes.

Strongly-Typed Models90%

C# class models for all API responses with intellisense support.

NuGet Distribution90%

Installable via NuGet package manager with .NET Standard 2.0 support.

MIT License95%

Permissive open-source license allowing commercial and derivative use.

Multi-Endpoint Architecture85%

Separate API clients for Gamma (metadata) and CLOB (trading) services.

How People Use Polymarket.Net

Build a Polymarket Trading Bot

80%

Quantitative developers and algorithmic traders with C# expertise.

You want to automate trading strategies on Polymarket—such as market-making, arbitrage, or momentum-based strategies—requiring programmatic order submission and real-time price monitoring.

^1,2

Create a Prediction Market Analytics Dashboard

85%

Developers building visualization tools or market research platforms.

You need to display real-time Polymarket data—prices, volumes, open interest—on a web or desktop dashboard for traders or researchers to monitor.

Monitor Market Resolution Events

80%

Researchers and data analysts tracking prediction market accuracy.

You want to automatically collect data on how markets resolve—tracking prediction accuracy, market efficiency, and historical outcomes for research purposes.

Alternatives to Polymarket.Net

Polymarket Official SDK90%

Official JavaScript/TypeScript SDK for wallet interactions; different language ecosystem.

Polymarket API (Direct REST)90%

Raw HTTP calls without client library abstraction; more flexible but higher effort.

Python Polymarket Clients70%

Community Python wrappers for the same APIs; better for data science workflows.

Metaculus API Clients50%

Different prediction platform; similar forecasting use case but non-blockchain.

Manifold Markets API50%

Alternative prediction market with different market mechanics and API.

Polymarket.Net vs Others

Polymarket.Net vs Polymarket Official JavaScript SDK

Dimension	Polymarket.Net	Polymarket Official JavaScript SDK	Notes
Language	C# / .NET	JavaScript / TypeScript	Different target developer ecosystems^1,3
Maintainer	Community (JKorf)	Polymarket official	Official SDK has faster update cadence^1,3
Scope	REST + WebSocket data APIs	Wallet + on-chain interactions	Different focus areas^1,3
Auth Support	Limited/unknown	Full wallet auth flows	Official SDK handles signing^1,3
License	MIT	MIT	Both permissive^1,3

Rule of thumb

Choose Polymarket.Net for C#/.NET backends, trading bots, or Windows desktop apps. Choose the official JavaScript SDK for web frontends, wallet-integrated dApps, or when you need authenticated trading with built-in signing logic.

^1,3

Polymarket.Net vs Direct Polymarket REST API

Dimension	Polymarket.Net	Direct Polymarket REST API	Notes
Setup Effort	Low (NuGet install)	Medium (HTTP client config)	SDK saves boilerplate^1,2
Type Safety	Strong (C# models)	None (raw JSON)	SDK prevents parsing errors¹
Flexibility	Constrained to SDK methods	Full API access	Direct API for edge cases^1,2
Update Cadence	Dependent on maintainer	Immediate with API changes	SDK may lag upstream¹
WebSocket Support	Built-in client class	Manual implementation	SDK simplifies streaming^1,2

Rule of thumb

Use Polymarket.Net for rapid development and when you benefit from typed models and built-in WebSocket handling. Drop down to direct REST calls when you need bleeding-edge features not yet in the SDK, or when minimizing third-party dependencies is critical.

^1,2

Polymarket.Net Risks & Limitations

Unofficial SDK may lag upstream API changes

85%

Most affects: Production trading systems requiring 100% API uptime and feature completeness.

Authentication and signing support unclear

80%

Most affects: Developers building automated trading bots requiring order submission.

No SLA or support guarantees

90%

Most affects: Teams without C# expertise or capacity to maintain forked dependencies.

Underlying Polymarket regulatory uncertainty

70%

Most affects: Applications targeting users in regulated jurisdictions like the United States.

^5,7

Timeline

Unknown date60%

Polymarket.Net Initial Release

Unknown date60%

WebSocket Support Added

Relationships

integrates_with

Polymarket95%

SDK wraps Polymarket's public REST and WebSocket APIs for market data and trading.

similar_to

Polymarket Official SDK90%

Official JavaScript SDK serves similar purpose for different language ecosystem.

built_on

Polygon85%

Polymarket runs on Polygon; SDK transactions ultimately settle on this chain.

built_by

JKorf95%

Independent developer maintaining the Polymarket.Net library.

FAQ

Sources & Verification

Founding year and specific release dates not documented in public sources

Authentication support details require further investigation for trading use cases

Polymarket.Net - C# client library for Polymarket REST and WebSocket API

github

GitHubFeb 26, 2026S1

Polymarket Documentation Overview

docs

PolymarketFeb 26, 2026S2

Polymarket Official SDK

github

GitHubFeb 26, 2026S3

Polymarket GitHub Organization

github

GitHubFeb 26, 2026S4

Polymarket | The World's Largest Prediction Market

official_website

PolymarketFeb 26, 2026S5

Developer Quickstart - Polymarket Documentation

docs

PolymarketFeb 26, 2026S6

Betting startup Kalshi raised $185M at $2B valuation

press

PitchBookFeb 26, 2026S7

Data QualityCompleteness: 78%Confidence: 78%

Help Improve This Page

This dossier for Polymarket.Net has some gaps. If you have knowledge about any of the following areas, consider contributing.

Exact initial release date

GitHub repo does not display creation date in accessible content

Suggested sources

- GitHub API for repo metadata
- NuGet package history

Authentication implementation details

README focuses on public data examples

Suggested sources

- Source code review
- GitHub Issues/Discussions
- Contact maintainer

Topic Hubs

prediction-market-infrastructure developer-tooling dotnet-sdk csharp-libraries crypto-api-clients algorithmic-trading

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Summary

Dimension

Polymarket.Net

Polymarket Official JavaScript SDK

Notes

Language

C# / .NET

JavaScript / TypeScript

Different target developer ecosystems^1,3

Maintainer

Community (JKorf)

Polymarket official

Official SDK has faster update cadence^1,3

Scope

REST + WebSocket data APIs

Wallet + on-chain interactions

Different focus areas^1,3

Auth Support

Limited/unknown

Full wallet auth flows

Official SDK handles signing^1,3

License

MIT

Both permissive^1,3

Dimension

Polymarket.Net

Direct Polymarket REST API

Notes

Setup Effort

Low (NuGet install)

Medium (HTTP client config)

SDK saves boilerplate^1,2

Type Safety

Strong (C# models)

None (raw JSON)

SDK prevents parsing errors¹

Flexibility

Constrained to SDK methods

Full API access

Direct API for edge cases^1,2

Update Cadence

Dependent on maintainer

Immediate with API changes

SDK may lag upstream¹

WebSocket Support

Built-in client class

Manual implementation

SDK simplifies streaming^1,2