Prediction markets
Prediction markets, measured neutrally.
Every venue ranks itself on the metric it picks. OCB picks the metrics, then ranks every venue on the same axis: resolution honesty, API latency, data freshness. Live cross venue measurement of prediction markets: volume, open interest, resolution delay, API latency and data freshness. One leaderboard, one methodology, across Polymarket, Kalshi, Limitless, Manifold and Myriad.
Total volume 30d
$13.17B
Active markets
52.3K
Cohort median resolution
37.7m
Cohort p50 API latency
158ms
Tracked venues and feeds
5 + 3
5 of 5 venues
| # | Venue | Volume 30dv | Open Interest:: | Active Markets:: | Median resolution:: | p50 API latency:: | Markets >$1M:: |
|---|---|---|---|---|---|---|---|
| 1 |  KalshiOff chain | $11.10B | $87.35M | 48.2K | ... | 158ms | 15 |
| 2 |  PolymarketOn chain | $2.07B | $447.61M | 2.1K | 37.7m | 166ms | 397 |
| 3 |  MyriadOff chain | $4.27M | $60.7K | 67 | ... | 279ms | 17 |
| 4 |  ManifoldOff chainPlay-money | $36.4K | $2.6K | 1.1K | ... | 18ms | 0 |
| 5 |  LimitlessOn chain | ... | $721.8K | 800 | ... | 130ms | 0 |
Source: pm-cohort-stats harness (volume, OI, active markets, top market, markets >$1M) plus the live PM bench fleet (api latency, resolution delay, freshness). All gauges scraped from the public OCB Prom, refresh interval 60s. Click a venue or feed row above to open its dedicated product page. Hover the dotted underline on any value to see how it is computed.