Prediction Market Polymarket Opens Sandbox Testing for New Trading System Nex

On November 13 that Josh, Head of DeFi Engineering at Polymarket, disclosed that the platform's Nex trading system, rewritten in Rust, has been opened for sandbox testing.

Josh stated that Nex has been running in parallel with the existing trading system over the past week, mirroring production orders to verify latency, load stability, and matching accuracy. During internal tests, the P99 order placement time dropped from 1.55 seconds in the current central limit order book to 3.76 milliseconds; this figure does not include end-to-end latency.

The team has also rewritten the WebSocket implementation in Rust, and related improvements may be deployed before the complete trading system goes live.