Can Kalshi change the rules of a market after you trade it?
Kalshi can change a market's rules text, title and times after trading has started, in some circumstances. Its rulebook allows changes to contract specifications after the first day of trading (OddsShopper). I have recorded 20 on Kalshi (6 clarifications, 10 rules edits, 3 date changes, 1 title change).
Cases in the news
- A lawsuit over Kalshi's Iran leadership market says a carve-out for the leader's death "was not disclosed until after airstrikes were reported". Kalshi later said it would refund trading fees on disputed settlements (Gaming America).
- Kalshi renamed a market before it resolved (Event Horizon).
What I compare on Kalshi
The title, the outcome name, the primary and secondary rules, the close and expiration times and the early-close condition, read from Kalshi's public API. Kalshi's API lists the markets it updated, so most edits show up within about 10 minutes, unless I'm behind on a busy evening.
Latest edits to Kalshi rules text
- Will Steve Hilton outperform the Real Clear Polling average in the 2026 California governor election?: Yes: Rules edited, Nov 3, 2026, 23:10 UTC.
- Will Abdul El-Sayed outperform the Real Clear Polling average in the 2026 U.S. Senate election in Michigan?: Yes: Rules edited, Nov 3, 2026, 23:00 UTC.
- Will Susan Collins outperform the Real Clear Polling average in the 2026 U.S. Senate election in Maine?: Yes: Rules edited, Nov 3, 2026, 22:55 UTC.
- Will Josh Turek outperform the Real Clear Polling average in the 2026 U.S. Senate election in Iowa?: Yes: Rules edited, Nov 3, 2026, 22:15 UTC.
- Will James Talarico outperform the Real Clear Polling average in the 2026 U.S. Senate election in Texas?: Yes: Rules edited, Nov 3, 2026, 22:15 UTC.
- Will Apple Inc. report above 168000 total full-time equivalent employees in 2026?: Above 168000: Rules edited, Nov 3, 2026, 17:50 UTC.
Edits by kind
| Kind | Polymarket | Kalshi |
|---|---|---|
| Clarification added | 0 | 6 |
| Rules edited | 1 | 10 |
| Resolution source changed | 0 | 0 |
| Outcome disputed | 18 | 0 |
| Dates changed | 42 | 3 |
| Title changed | 1 | 1 |
| All edits | 62 | 20 |
How to be told
Press Watch on a Kalshi market, or paste its ticker (for example KXHOUSE-26) on the watchlist, then add a Discord channel, a webhook or the private RSS feed. The alert carries the old and new words. Details: alerts for Kalshi rules changes.
Limits
- Kalshi doesn't publish when it edited. I show the window between my last check with the old text and the check that found the new.
- A ruling explained only on X or in a support reply isn't in the API. Link it on the market page and watchers are alerted.
Numbers as of Nov 4, 2026, 19:11 UTC; they refresh every 6 hours.