Prediction market API rate limits, tested with a daily ramp
TradingKalshi
Trails313 ms
- p99
- 496 ms
- rank
- #3
- samples
- 51,835
Metaculus
No data in window
Kalshi vs Metaculus
Kalshi vs Metaculus on 2 shared OpenChainBench benchmarks, awaiting live measurements.
Kalshi
CFTC-regulated US prediction market exchange. REST trade API (trade-api/v2) with documented per-tier rate limits; the market data WebSocket requires authentication.
Side by side measurements
Best prediction market API, ranked by live latency and uptime
TradingKalshi
Trails318 ms
- p99
- 478 ms
- rank
- #3
- samples
- 51,834
Metaculus
No data in window
Frequently asked questions
Kalshi vs Metaculus: which one is better?
Kalshi and Metaculus are compared on 2 shared OpenChainBench benchmarks. See the live table on this page for every metric.
How is the Kalshi vs Metaculus comparison measured?
Every benchmark on this page uses the same open methodology, published at https://openchainbench.com/methodology. Data is CC-BY-4.0. Measurement harnesses are MIT-licensed.
How this pair was selected
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.