Polymarket has opened sandbox testing for Nex, its trading system rewritten in Rust, according to Josh, the platform’s DeFi engineering lead. The team plans four weeks of shadow testing against production traffic and, if that goes well, expects to launch Nex in mid-December. That launch was still a plan, not a completed deployment, when the report was published.
Josh said Nex had run alongside the existing trading system for the preceding week, mirroring production orders to check latency, stability under load and matching accuracy. In internal tests, P99 order-placement time fell from 1.55 seconds on the existing central limit order book to 3.76 milliseconds on Nex. Those figures do not include end-to-end latency.
The team has also rewritten its WebSocket system in Rust. Josh said those improvements could arrive before the full trading system launches.
Source: TechFlow, published November 13, 2026, at 23:49:11 UTC+08:00.