Install it in 30 seconds
The Chrome Web Store and Firefox Add-ons releases are in review. Until they're live, you can load it unpacked — it's the exact same extension.
Open your extensions
Go to chrome://extensions (or edge://extensions) and turn on Developer mode, top-right.
Load unpacked
Click Load unpacked, pick the polyedge-extension folder, then open any Kalshi or Polymarket market.
On Firefox: about:debugging → This Firefox → Load Temporary Add-on → pick manifest.json.
What the panel shows
The price, graded
Fair price, or overpaying the spread? The panel reads the order book and shows the real cost to enter — spread, slippage, and fee, in plain cents.
Cheaper elsewhere?
If the same contract is cheaper on the other venue, it says so — and only calls it an edge when the resolution rules truly match.
Honest by default
No confident match? It says "no cross-venue twin found." A wrong in-context call is the one thing we refuse to ship.
What it knows about you: almost nothing
The extension is a thin client — the pricing runs on our servers. It sends only the public market identifier you're viewing to fetch the read, stores just your panel preference locally, and has no account, no tracking, and no ads. It grades the price and never sells a pick — and this engine is never licensed to a prediction-market venue. Read the full privacy policy →