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Definition

The Market Channel (often referred to as the Market Channel WebSocket) is Polymarket's WebSocket endpoint that streams real‑time market data. Use it to receive order-book snapshots and live updates such as book, price_change, best_bid_ask, last_trade_price, and tick_size_change events for subscribed instruments.

In context

You encounter the Market Channel when you need low-latency market data for trading or monitoring. The canonical endpoint for market data is the Market WS: wss://ws-subscriptions-clob.polymarket.com/ws/market. The feed pings every 10 seconds and allows up to 500 instruments per connection. When subscribing, include custom_feature_enabled: true to receive best_bid_ask events.

Common events streamed on the Market Channel

• book: the full or partial order-book state for an instrument.
• price_change: a change in quoted prices (midpoint or last trade-based metrics).
• best_bid_ask: the best bid and ask on each side (available when custom_feature_enabled: true).
• last_trade_price: the price of the most recent trade.
• tick_size_change: notifications when the market's tick size tightens or loosens.

Practical notes

• Connection limits: a single Market Channel connection supports up to 500 instruments. Open additional connections for more coverage.
• Heartbeat: the server PING every 10 seconds helps you detect stale connections.
• Tick size behaviour: Polymarket normally uses $0.01 ticks but tightens to $0.001 near price extremes; subscribe to tick_size_change to update UI and validation logic.
• Auth: market data on the Market Channel is public; no API key is required for read-only subscriptions.

See also

• /glossary/clob-api