Statistics
Domain composition at the canonical hour
| Domain | Markets |
|---|---|
| Sports | 86,455 |
| Other | 24,098 |
| Mixed / Multi- | 17,224 |
| Politics & Elections | 6,602 |
| Entertainment & Culture | 2,630 |
| Crypto & Digital Assets | 1,563 |
| Companies & Business | 1,237 |
| Technology & AI | 1,191 |
| Economics & Inflation | 969 |
| World & Geopolitics | 428 |
| Monetary Policy | 368 |
| Climate & Weather | 208 |
| Science & Health | 92 |
The residual “Other” domain is shown as measured. It is not hidden, redistributed, or folded into neighbouring domains.
Markets by venue, frozen record
| Venue | Markets |
|---|---|
| Kalshi | 111,268 |
| Polymarket | 31,797 |
Open interest by venue, frozen record
| Venue | Open interest | Unit |
|---|---|---|
| Kalshi | 887,881,896. | contracts |
| Polymarket | 458,052,734. | usd |
Pooled probability distribution
| Probability band | Markets |
|---|---|
| 0–10% | 83,843 |
| 10–20% | 13,583 |
| 20–30% | 7,140 |
| 30–40% | 5,645 |
| 40–50% | 10,745 |
| 50–60% | 8,193 |
| 60–70% | 1,809 |
| 70–80% | 1,545 |
| 80–90% | 1,646 |
| 90–100% | 4,097 |
This distribution has its own denominator of 138,246 observations. It is not a distribution of active markets, and the two figures are not interchangeable.
Current activity
| Venue | Volume, last 24h | Unit |
|---|---|---|
| Kalshi | 124,688,856. | contracts |
| Polymarket | 23,876,520. | usd |
Market families: 2,815. Kalshi market families (Polymarket is not series-structured)
The canonical record is missing 1 dated record: 2026-06-07. The public API returns not frozen for that date. The gap is shown as a gap rather than closed by interpolation.
The source carries a combined open-interest total across venues. It is not shown. Kalshi open interest is denominated in contracts and Polymarket in US dollars; the two are not addable.
Category-level open interest is withheld because its cross-venue unit basis could not be verified from the authorized production scope. Category counts are shown; category capital is not.
The velocity substrate has not refreshed since 2026-06-05, so measures derived from it are omitted rather than shown stale.
The situations substrate reports itself stale and currently holds no records, so no situation measure is shown.
The canonical observatory overview, including its full methodology section, is published at volroc.ai/prediction-markets/.
Every figure on this Platform is read from the public record published at volroc.ai and governed by the institution at reference.volroc.ai. The Platform summarises, links and analyses. It never amends the record, and it holds no private copy of it.