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.
Resolution steps changed from none to proposed, then disputed.
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…
When edits land
How wide the edit window is
How it works
Neither venue tells holders when it edits a market. So I keep a copy of every market's rules and compare.
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.
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.
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.
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
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
UMA resolution status: - none + proposed, then disputed
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.
Edits per day
Both venues, one edit per eventWho 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
- 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
Pro Paid once
- 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?
How fast do I hear about an edit?
What does RulesWatch miss?
Is every change a clarification?
Why can't I see edits from before October 31?
Do I need an account?
What does Pro cost?
Are you part of Polymarket or Kalshi?
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.