Polymarket and Kalshi, since Oct 31, 2026

Know when a market you hold changes its rules.

RulesWatch saves the rules of 40,041 prediction markets and rereads them all day. When a venue adds a clarification, moves an end date or swaps the resolution source, you see the words it removed and added, the Yes price before and after, and get a message if you hold the market.

One market is free. Pro is $12, paid once. No account needed.

Latest editPolymarket
Outcome disputedEdited between Oct 31 21:30 and 00:26 UTC (2.9 h window)Yes74¢63¢93¢+19¢
UMA resolution status
proposeddisputed

Resolution steps changed from none to proposed, then disputed.

Markets tracked
40,041
20,982 Polymarket, 19,059 Kalshi
Edits recorded
4
0 to rules text or source, 2 disputes
Tracking since
Oct 31
09:06 UTC, first snapshot
Median edit window
2.9 h
last check with old text to first with new

Every edit, on the price chart

Each numbered marker is a rules edit I recorded. Point at one to read what changed, or open it. This is the market with the most edits so far.

Loading the market…

Yes price1Rules edit

When edits land

Changes per hour, last 14 days, UTC. Darker means more.
The record

How wide the edit window is

From my last check with the old text to the check that found the new text

How it works

Neither venue tells holders when it edits a market. So I keep a copy of every market's rules and compare.

1

I save the rules

The rules text, resolution source, end date, title and UMA status of every market that traded in the last day: 40,041 right now.

2

I reread them

Every 5 minutes for watched markets, about every 10 minutes for Kalshi, every hour or two for busy Polymarket markets. A changed fingerprint means an edit.

3

You get the diff

Removed words in red, added words in green, the window it happened in and the price. If you watch the market, the alert goes to Discord, Telegram, a webhook or RSS.

The diff

Read the edit as sentences

A rewritten sentence shows the old phrase and the new phrase whole, so you can read both. Inline or side by side, with unchanged text folded down to the parts around the edit.

  • Word counts per field, added and removed
  • Dates and sources shown as before and after values
  • A share card with the same red and green for X and Discord

Browse the edits

Alerts

A message within one check of the edit

Put a market on your watchlist, or paste your Polymarket wallet and I follow every open position. Each alert carries the market, the kind of edit and the changed lines, so you can decide without opening anything.

  • Discord, Telegram, any JSON webhook, private RSS
  • One alert per edit, even when it hits a whole event
  • Quiet mode skips date moves and routine proposals

Set up alerts

The record

How often each venue edits, and when

Counts by venue, kind and category, how many edits come in the last 48 hours before a market ends, the most edited markets, and how traders rated each edit. Built only from what I recorded, and it grows every day.

Open the record · Weekly reports

Edits per day

Both venues, one edit per event

Who uses it

Traders holding positions

Paste your wallet or the markets you hold. When a clarification lands on one of them, you know before the order book refills.

Market makers and bots

Send every edit to your own server as JSON, with the before and after text of each field, and pull quotes before you're picked off.

Reporters and researchers

Quote a dated record of what a market said before an edit. Export every change as CSV, or link a change page that shows the diff.

Pricing

The feed, the record and every market page are free for everyone.

Free

$0
for as long as the site runs
  • The full feed of edits on both venues
  • Every market page: price chart, rules history, resolution status
  • The record and weekly reports
  • A watchlist with one market
  • Alerts to one Discord channel, plus private RSS
  • Alerts when a trader links a Discord or X clarification
Start a watchlist

Pro Paid once

$12 one time
no subscription, 14-day refund
  • Everything in Free
  • No limit on watched markets
  • Your Polymarket wallet followed: markets added and dropped as you trade
  • Telegram and webhook alerts, up to five channels
  • CSV and JSON export of every recorded change, and the API with your key
  • Sign in on any device with your key or a passkey

Questions

Why would the rules change after I bought?
Polymarket adds a clarification when the rules don't settle a case that came up: a recount, a postponed game, a source that stopped publishing. Kalshi edits contract terms and dates. Both say these edits only explain what the rules meant. Traders have lost money when an edit decided the outcome, as in the MicroStrategy market in June 2026.
How fast do I hear about an edit?
Markets on a watchlist are checked every 5 minutes. When an edit lands, the alert goes out on the same run or the next one. Kalshi edits to any market usually show up within 10 minutes, because Kalshi's API lists what changed. Busy Polymarket markets are reread every hour or two; quiet ones much less often, so put yours on a watchlist.
What does RulesWatch miss?
A clarification posted only on Discord or X, without an edit to the market, never reaches the API. Each market page has a box where traders link those, and watchers get an alert. If a market changes twice between two checks, I see only the end result. The time shown is when I noticed, inside a window I state.
Is every change a clarification?
No. Each change gets a label from what changed: a clarification, a rules edit, a new resolution source, moved dates, a renamed market, a disputed outcome. Routine steps, like an outcome proposed when a market ends or a target price filled in when a short market opens, are kept but left out of the default feed.
Why can't I see edits from before October 31?
Neither venue keeps old versions of its rules. I took the first snapshot of every open market on October 31, 2026, and every edit since is compared against it. A copy of this site started today would begin with an empty history.
Do I need an account?
No. A watchlist lives in your browser. Open it on another device with a private link, a passkey, or your Pro license key.
What does Pro cost?
$12, paid once. It removes the one-market limit, follows your Polymarket wallet, adds Telegram and webhook alerts and CSV or JSON export. If it isn't useful, ask within 14 days for a full refund.
Are you part of Polymarket or Kalshi?
No. RulesWatch reads their public APIs and isn't affiliated with either venue, or with UMA. The rules on the venue's own page are the ones that count.

Polls close Nov 3. Watch the races you hold.

Recounts, runoffs and late calls are the cases clarifications get written for. 40,041 markets are on record, including every House, Senate and governor market on both venues.