Side by side OpenChainBench measurements. Identical layout, no editorial verdict, the live data leads. Each panel surfaces the aggregate plus the chain and region breakdowns when the underlying bench exposes them, straight from the Prometheus queries that drive the parent benchmark pages.
CFTC-regulated US prediction market exchange. REST trade API (trade-api/v2) with documented per-tier rate limits; the market data WebSocket requires authentication.
Codex Polymarket
Trails175 ms
Kalshi
Leads127 ms
Per region
| Region | Codex Polymarket | Kalshi |
|---|---|---|
| US East | 89 ms | 19 ms |
| EU West | 196 ms | 126 ms |
| Singapore | 203 ms | 327 ms |
A pair is published when all four conditions hold. Both providers run in the same OpenChainBench benchmark for at least seven consecutive days. Each provider has at least 1000 samples in the measurement window. The head to head query has observable third party search demand. Both providers have a public /products/[slug] page on OCB. The full pair ledger is versioned in the public repo so the methodology is externally verifiable.