TOTAL VOLUME:
$134.2b
24H VOL:
$143,246,370
24H TRANSACTIONS:
2,403,290,006
OPEN INTEREST:
$1,452,035,386
405,032
Markets across
30,543
events
MATCHED EVENTS:
2,690
PLATFORM COVERAGE:
5
Polymarket:
39%
VS.
Kalshi:
61%
Closed: Sep 21, 12:00 PM EST
Kalshi
These markets track whether the S&P 500 index will surpass specific threshold values at a precise moment in time. Each market has a different threshold, allowing participants to speculate on the exact level of the index at noon EDT on September 21, 2026.
All markets share the same event-level rules: resolution depends on the S&P 500 index value at 12pm EDT on September 21, 2026. Each individual market resolves to 'Yes' if the index exceeds its specified threshold (e.g., 7474.9999 or higher for the first market, with incrementally higher thresholds for subsequent markets). Markets close on September 21, 2026, and expiration occurs at the sooner of the first official data release or one week after that date. The Exchange has applied specific modifications to the source agency and underlying assets for all index-related markets as noted in the Kalshi Rulebook.