Most tradable markets on a perp DEX, live count per venue
TradingKalshi
Leads85
- p99
- 86
- rank
- #13
- samples
- 2,880
Ostium
Trails83
- p99
- 83
- rank
- #14
- samples
- 2,880
Active markets
Kalshin/aOstiumn/a
Kalshi vs Ostium
Kalshi leads on 1 of 3 shared benchmarks, Ostium on 2. Kalshi wins on Most tradable markets on a perp DEX, live count per venue (85 vs 83). Ostium wins on Perp DEX asset breadth (74 vs 66), Perp DEX volume to open interest (0.074x vs 12.0x). Data as of 2026-11-08 UTC.
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.
Ostium
Arbitrum-based perp DEX specialized in RWA exposure including FX, commodities and indices.
Side by side measurements
Perp DEX asset breadth: non-crypto markets live, stocks + indices + forex + commodities
TradingKalshi
Trails66
- p99
- 66
- rank
- #8
- samples
- 2,880
Ostium
Leads74
- p99
- 74
- rank
- #7
- samples
- 2,880
Non-crypto markets
Kalshin/aOstiumn/a
Counts reflect each venue's live market catalog at query time, mainnet only. The asset class comes from the venue's own metadata where it publishes one; Hyperliquid HIP-3 dexes and dYdX publish none, so their symbols are matched against the crypto markets the other venues list and a fixed table of forex, commodity and index names. Tokenized gold (PAXG, XAUT) is a crypto token and is not counted. A market counts once whether it trades 24/7 or only during exchange hours.
Perp DEX volume to open interest: 24h turnover per dollar of OI, live
TradingKalshi
Trails12.0x
- p99
- 17.3x
- rank
- #21
- samples
- 2,880
Ostium
Leads0.074x
- p99
- 0.156x
- rank
- #2
- samples
- 2,880
Volume / OI (24h)
Kalshin/aOstiumn/a
The ratio is a screen, not a verdict. Both terms are the venue's own figures (24h volume and open interest as each API reports them, in USD), so a venue that counts both legs of a fill moves its ratio without changing anything real. A very low ratio (Ostium, 0.2x) means positions held for days on thin daily volume; a very high one (Kalshi, above 40x) means a day of trading dwarfs what stays open. The bands in the methodology say what each range usually means.
Frequently asked questions
Kalshi vs Ostium: which one is better?
Kalshi and Ostium are compared on 3 shared OpenChainBench benchmarks. Kalshi leads on Most tradable markets on a perp DEX, live count per venue. Ostium leads on Perp DEX asset breadth. See the live table on this page for every metric.
Which has the higher active markets, Kalshi or Ostium?
On the Most tradable markets on a perp DEX, live count per venue benchmark, Kalshi leads at 85 versus Ostium at 83. Live measurement is updated continuously by the OpenChainBench harness.
Which has the higher non-crypto markets, Kalshi or Ostium?
On the Perp DEX asset breadth benchmark, Ostium leads at 74 versus Kalshi at 66. Live measurement is updated continuously by the OpenChainBench harness.
How is the Kalshi vs Ostium 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.
Related comparisons
How this pair was selected
Auto-generated pairs require: both providers in the same benchmark for seven consecutive days, at least 1000 samples per provider, observable third-party search demand, and a public /products/[slug] page on OCB. Editorially curated pairs (like this one) may publish early when search demand is high and data is accruing; panels with fewer than 100 samples are shown as provisional. The full pair ledger is versioned in the public repo.