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. Polymarket vs Kalshi plus Limitless and Myriad on one cross-venue leaderboard: volume, open interest, resolution delay and API latency.
Total volume 30d
$17.05B
Active markets
131.1K
Cohort median resolution
51.5m
Cohort p50 API latency
221ms
Tracked venues
9
9 of 9 venues
| # | Venue | Volume 30dv | Open Interest:: | Active Markets:: | Median resolution:: | p50 API latency:: | Markets >$1M:: |
|---|---|---|---|---|---|---|---|
| 1 |  KalshiOff chain | $12.76B | $996.84M | 124.8K | ... | 270ms | 17 |
| 2 |  PolymarketOn chain | $2.19B | $342.74M | ... | 51.5m | 308ms | ... |
| 3 | Polymarket USOff chain | $2.06B | ... | 5.0K | ... | ... | ... |
| 4 |  MyriadOn chain | $19.60M | $38.6K | 37 | ... | 521ms | 18 |
| 5 |  LimitlessOn chain | $12.35M | $378.0K | 403 | ... | 172ms | 0 |
| 6 |  ManifoldOff chain | $78.4K | $2.7K | 875 | ... | 13ms | 0 |
| 7 |  PredictItOff chain | ... | ... | ... | ... | 106ms | ... |
| 8 |  SmarketsOff chain | ... | ... | ... | ... | ... | ... |
| 9 | MEMetaculusOff chain | ... | ... | ... | ... | ... | ... |
Measured answers
- How long does Polymarket take to resolve a market?
- Polymarket vs Kalshi, which resolves prediction markets faster?
- Which prediction market API has the strictest rate limits?
- What fees does Polymarket charge?
- Polymarket vs Kalshi fees, which is cheaper to trade?
- Is Polymarket safe to use?
- Which prediction market is best for sports?
- Which prediction market is best for politics and elections?
- Manifold Markets vs Polymarket, which should you use?
- Is Polymarket legal in the United States?
- Which prediction market API is best for developers?
Source: pm-cohort-stats harness (volume, OI, active markets, top market, markets >$1M) plus the live PM bench fleet (api latency, resolution delay, ws latency). All gauges scraped from the public OCB Prom, refresh interval 60s. Click a venue row above to open its dedicated product page. Hover the dotted underline on any value to see how it is computed.