polymarket-rs

Note

This library is under active development and considered alpha quality.

• Breaking changes may occur in future updates without prior notice
• API signatures, types, and module structures are subject to change
• Not recommended for production use yet
• Use at your own risk

A modern, type-safe Rust client library for the Polymarket CLOB (Central Limit Order Book) and Data API.

This project is a complete rewrite of polymarket-rs-client with improved ergonomics, additional API methods, and removal of generic type parameters for a cleaner API surface.

Features

• Full Authentication Support - L1 (EIP-712) and L2 (HMAC) authentication
• WebSocket Streaming - Real-time market data and user events with automatic reconnection
• Builder Pattern - Fluent APIs for configuration and order creation
• Async/Await - Built on tokio for high-performance async operations
• Decimal Precision - Accurate financial calculations with rust_decimal
• Modular Design - Separated clients for different operations
• Zero Panics - Comprehensive error handling with custom Result types

Installation

Add this to your Cargo.toml:

[dependencies]
polymarket-rs = { git = "https://github.com/pawsengineer/polymarket-rs.git" }

Quick Start

Client Types

Client	Purpose	Authentication
ClobClient	CLOB market data queries	None
AuthenticatedClient	API key management, account operations	L1 (EIP-712) or L2 (HMAC)
TradingClient	Order creation, cancellation, trade queries	L2 (HMAC)
DataClient	Position and portfolio data	None

Public Market Data

Query market data without authentication:

use polymarket_rs::{ClobClient, TokenId};

let client = ClobClient::new("https://clob.polymarket.com");
let token_id = TokenId::new("...");

// Get midpoint price, order books, spreads, etc.
let midpoint = client.get_midpoint(&token_id).await?;
let book = client.get_order_book(&token_id).await?;

See examples/clob_data.rs and examples/public_data.rs for complete examples.

Authenticated Trading

Three-step process for authenticated trading:

use polymarket_rs::{AuthenticatedClient, TradingClient, OrderBuilder, SignatureType};

// 1. Create or derive API credentials
let auth_client = AuthenticatedClient::new(host, signer.clone(), chain_id, None, None);
let api_creds = auth_client.create_or_derive_api_key().await?;

// 2. Create trading client with order builder
let order_builder = OrderBuilder::new(signer.clone(), Some(SignatureType::Eoa), None);
let trading_client = TradingClient::new(host, signer, chain_id, api_creds, order_builder);

// 3. Create and post orders
let order_args = OrderArgs::new(token_id, price, size, Side::Buy);
trading_client.create_and_post_order(&order_args, None, None, options, OrderType::Gtc).await?;

PolyProxy & PolyGnosisSafe Wallets: For proxy wallets, pass the proxy address to AuthenticatedClient and use SignatureType::PolyGnosisSafe in OrderBuilder. Proxy wallets have automatic allowance management.

See examples/authenticated_trading.rs for complete examples including proxy wallet setup.

WebSocket Streaming

Real-time market data and user events with automatic reconnection:

use polymarket_rs::websocket::{MarketWsClient, ReconnectingStream, ReconnectConfig};
use futures_util::StreamExt;

let client = MarketWsClient::new();
let config = ReconnectConfig::default();

let mut stream = ReconnectingStream::new(config, move || {
    client.subscribe(token_ids.clone())
});

while let Some(result) = stream.next().await {
    // Process market events
}

See examples/websocket_market.rs and examples/websocket_user.rs for complete streaming examples.

Examples

Run examples from the examples/ directory:

# Public market data
cargo run --example clob_data
cargo run --example public_data

# Authenticated trading
PRIVATE_KEY="0x..." cargo run --example authenticated_trading

# WebSocket streaming
cargo run --example websocket_market
PRIVATE_KEY="0x..." cargo run --example websocket_user

License

Licensed under either of:

• MIT license (LICENSE-MIT)

Contributing

Contributions are welcome! Please feel free to submit a Pull Request.

Disclaimer

This is an unofficial library and is not affiliated with Polymarket. Use at your own risk. Always test with small amounts first on testnet before using real funds.