Try Catalyst free  ·  3 free analyses  ·  stay free with your own key
// prediction market intelligence

The market moved.
Find out why.

Browser extension for Polymarket and Kalshi. Find out what changed the odds and what made markets spike or drop — right in your browser, in seconds.

Add to Chrome — free
Free to install  ·  3 free analyses  ·  then use your own key free or choose Pro
// works on Kalshi Polymarket Manifold soon PredictIt soon
// how it works

Your copilot on
prediction markets

Every chart tells a story.
Catalyst reads it.

01
Install. Access any time.

Add Catalyst to Chrome. It activates silently on any Kalshi or Polymarket market page — no setup, no configuration.

Catalyst installed in Chrome — accessing the side panel on a market page
02
Click a point. Drag a range.

Click any point on a chart to lock a date, or drag to select a time window. Catalyst captures the exact market data at that moment.

Clicking a point or dragging a range on the chart
03
Read the story behind the move.

Get a clear explanation of what drove the change — the events, decisions, and news behind it — with source links so you can read the evidence yourself.

// pricing

Try it free.
Upgrade when it clicks.

Install for free and run 3 analyses on us — no card required. After that, bring your own API key and keep going free forever, or upgrade to Pro for deeper answers and zero setup.

Free → $3.99 /mo
3 free analyses · then Pro or your own key
  • 3 free analyses — no card required
  • Works on Kalshi and Polymarket
  • Sourced results — see the evidence behind every answer
  • Binary and scalar market support
  • Pro: our best model, deeper answers, no key needed
  • Free after trial: bring your own Perplexity, OpenAI, or Anthropic key
Add to Chrome — free →
or subscribe to Pro now
cancel anytime  ·  secure checkout
// faq

Common questions

Anything else? Reach out directly.

Catalyst works on Kalshi and Polymarket market pages — both binary (yes/no) markets and scalar markets like valuations and price targets. Open any market page and the extension activates automatically.
Catalyst searches real news sources and public information from the period you select, then synthesizes a clear explanation of what drove the move. Every result includes direct source links so you can read the original articles yourself.
Install the extension and create a free account — no credit card needed. You get 3 analyses on us. Once those are used, continue free by adding your own API key (Perplexity, OpenAI, or Anthropic), or choose Pro for up to 250 analyses per billing period on our best model under the fair-use limit.
Yes. After your 3 free analyses, add a Perplexity, OpenAI, or Anthropic API key in the extension settings and keep using Catalyst for free. Your key is stored in Chrome's local storage, sent securely with each analysis request to call your chosen provider, and not saved in our database. Pro subscribers skip this setup and use our best model.
Yes, immediately and with no friction. Cancel from the extension settings or your Stripe billing portal.
Catalyst is a Chrome extension — it works on desktop Chrome. Mobile Chrome doesn't support extensions. Use it at your desk while researching markets.
// free to try

Stop wondering why
the graph moved.

3 free analyses · then use your own key free or choose Pro

Add to Chrome — free →
Send us feedback
What do you like / dislike? Any feature requests?