OpenChainBench
Full benchmark: Polymarket WebSocket latency, live connection and update speed from 3 regions
TradingPolymarket

Polymarket WebSocket

As of July 29, 2026, Polymarket WS connect to snapshot is 2.02 s at the median (p50, 24h window), with 2.43 s at p90 and 5.46 s at p99. Polymarket ranks #1 of 2 chains measured on this benchmark.

Polymarket publishes a public CLOB WebSocket at wss://ws-subscriptions-clob.polymarket.com/ws/market with no authentication required. After subscribing with an assets_ids array, the feed delivers orderbook snapshots and price change events. The harness records connect-to-snapshot at 2.02 s p50 (24h, all regions) and the inter-arrival distribution visible in the panels below. The feed is fronted by Cloudflare so regional latency differences are small. The PING keepalive every 10 seconds keeps idle connections alive. This is the only venue in the cohort with a standard, public, unauthenticated WebSocket.

How Polymarket compares

Live p50 over the last 24 hours across every chain on this benchmark, ranked lowest first.

  1. #1Polymarket2.02 s
  2. #2Kalshi10.00 s

Methodology, charts and the full ledger live on the Polymarket WebSocket latency, live connection and update speed from 3 regions page. Raw data: JSON endpoint.