Checkout Guard for Chrome

How it works

1. 1

   Wakes up only at checkout

   It stays quiet until a page asks for your card number, CVV or Social Security number. On login and sign-up forms it only shows a small “Check this site with Bluff” button, and sends nothing unless you click it.

2. 2

   Checks the store before you pay

   Bluff's server crawls the store's public pages (refund policy, contact, terms) and an NVIDIA Nemotron agent rates the site with the evidence it found. A panel slides in next to the checkout. If the AI can't finish, you get Bluff's rules-only basic check, labeled as one.

3. 3

   Remembers where your card went

   If you continue anyway, Bluff logs the site. When a charge from that store later shows up on your card, Bluff links it back to this visit, alerts you in the phone view and drafts a dispute for you to review.

Exactly what it sends

Bluff's server then visits the store's public pages itself, like any shopper could, and sends their text to NVIDIA Nemotron for the review. Privacy lists everything Bluff keeps.

Install in four steps

1. 1
   Download the zip and unzip it. You get a folder with manifest.json inside.
2. 2
   Open chrome://extensions in a new tab and switch on Developer mode (top right).Copy address
3. 3
   Click Load unpacked and choose the unzipped folder.
4. 4
   Pin it: open the puzzle-piece menu and pin Bluff Checkout Guard. Click its icon any time to see that it's on.

Chrome lists it with access to all sites, because it has to look for card fields on any checkout page. It reads field labels only, never what you type. Open bluffai.us once in the same browser so what it logs lands in your Bluff account.

Try it on a demo store

Both are demo stores, not real shops: don't enter real card details. On a demo store, press Continue and watch my charges and the panel offers Make this purchase on the test card: a simulated purchase on Bluff's sandbox card that the bank scan then links back to your visit.