Prediction market volume today
Cross-venue totals are cash traded, taker side, from each venue’s public API.
Snapshot as of . Refresh scheduled every 30 minutes.
How these numbers are counted
Excluded · routes another venue’s flow
27 front-ends carrying DefiLlama’s doublecounted flag, 8.2M/24h already inside Polymarket’s number.
- Betmoar.fun$3,431,548
- Traderline Predictions$2,130,872
- Gate Predictions$1,240,486
- PolyCop Predictions$293,976
- Jupiter Prediction$258,987
- Stand$152,490
- MetaMask Predictions$146,183
- Preddy$145,175
Reachable, publishes nothing
- PredictIt207 markets / 635 contracts priced, but no vol
- Matchbookreachable · no usable stats found
- Crypto.com Derivatives NApublic API lists 925 instruments, none of them
- Gemini Titanreachable · no usable stats found
- SX Betmarkets listed, no volume or open interest fie
- Smarketsevents listed, no volume on the public feed
- Myriadresponds, returns an empty market list
- AzuroGraphQL subgraph · needs a query, no REST summ
No public API
- Polymarket US (QCX)401 · requires credentials; API exists but req
- Betfair Exchange403 · blocks automated access; world's largest
- ProphetXunreachable · no DNS or connection refused
- BETDAQ403 · blocks automated access
- Railbirdunreachable · no DNS or connection refused
- Rothera Exchangeunreachable · no DNS or connection refused
- Aristotle Exchangeunreachable · no DNS or connection refused
- CME event contracts403 · blocks automated access
Frequently asked questions
What is prediction market volume today?
On Kosmos Tape (kosmos.fyi/data), cross-venue volume is cash traded on the taker side, summed from each exchange’s public API. Snapshots are scheduled to refresh every 30 minutes. Check the snapshot time and retained-value notice before citing YTD, all-time or open-interest figures. Source: Kosmos Tape.
Kalshi vs Polymarket volume — who is bigger?
Compare them on the head-to-head and venue table on this page. Venue headlines are $1-face notional and labeled; site-wide YTD/all-time totals are cash, taker side. Don’t mix the two units. Details: kosmos.fyi/methodology.
Is this the same as “notional” volume I see on Kalshi or Polymarket?
No. A venue’s own headline is usually $1-face notional (contracts/shares printed with a $). Tape’s cross-venue totals convert to cash traded so venues can be summed honestly. Rule 01: kosmos.fyi/methodology.
Why don’t you add Robinhood or DraftKings volume on top?
Those are brokerages routing to an exchange. Their flow is already inside that DCM’s number — adding them double-counts. See excluded brokerages on /methodology.
