Polymarket’s new trading system, Nex, has opened for sandbox testing but is not yet live, according to a ChainCatcher report published on November 13, 2026, at 23:47 (UTC+8). Josh, Polymarket’s vice president of engineering for its DeFi business, announced the Rust rewrite on X.
Nex had spent the preceding week in shadow mode, mirroring production orders to test latency, stability under load and matching accuracy. Josh said internal tests showed P99 order-placement latency falling from 1.55 seconds on the existing central limit order book (CLOB) to 3.76 milliseconds on Nex. That figure is not end-to-end latency.
The team planned four weeks of shadow testing and, if it went well, expected to launch Nex in mid-December. WebSocket improvements could arrive earlier.