Polymarket’s new trading system, Nex, is open for sandbox testing but has not gone live. Josh, the company’s vice president of engineering for its DeFi business, announced the update on X, according to PANews’s report published on November 13, 2026, at 23:47 (UTC+8).
Nex was rewritten in Rust. Over the preceding week, it had run in shadow mode, mirroring production orders to test latency, stability under load and matching accuracy without replacing the live system.
Josh shared internal test results showing P99 order-placement latency of 3.76 milliseconds for Nex, compared with 1.55 seconds for the existing central limit order book (CLOB). That measure is not end-to-end latency.
The team planned four weeks of shadow testing and, if it went well, expected Nex to go live in mid-December. WebSocket improvements could arrive earlier. Those were plans at the time of the report, not confirmation of a launch.