Last updated: November 1, 2026
This policy describes DealScan version 1.2.1.
DealScan is a browser extension that evaluates Facebook Marketplace listings using the Anthropic (Claude) API. This policy explains what data the extension handles and how.
DealScan has no servers of its own and sends nothing to the developer. It stores data only in your browser. It connects to two outside services: the Anthropic API, using an API key you provide, and Facebook's image servers, to download listing photos.
On a Marketplace listing, with the side panel open, the extension reads the listing's title, price, condition, description, location, year and mileage (where shown), photo addresses, and the page address. Reading the listing does not send it anywhere. If no structured description is available, the extension uses the longest block of text on the page as the description, which could include other text from the page.
The extension's scripts load on all facebook.com pages so they can detect when you move to a listing without a page reload. On other pages they check only the page address and do not read page content.
When you start an evaluation, the extension sends the Anthropic API (api.anthropic.com):
Nothing is sent when you only browse listings, when the extension can't read a listing, or when a cached result is shown.
Seller information. This version reads the seller's name from the listing's data when the page provides it, but does not send it to Anthropic or save it. It does not read the seller's profile link. Text and photos are sent as they appear in the listing, so if a seller's name appears in the description or in a photo, it is included.
Web search. This is off by default. If you turn it on in the options, Claude can run web searches on Anthropic's side to look up prices.
chrome.storage.local): your API key, model choice,
and the photo and web search options.chrome.storage.local): for evaluations you
choose to save, an ID generated by the extension, the date saved, the listing address,
title, category, price, currency, score, verdict, recommendation, suggested offer, and
summary. You can remove entries, clear history, or
export it as a file from within the extension.chrome.storage.session): recent results,
keyed by listing address, so reopening a listing doesn't repeat the request. These are
cleared when the browser closes.None of this is synced to your Google account.
Data sent to the Anthropic API is processed by Anthropic, PBC to provide the evaluation. Anthropic's handling of that data is governed by its own policies, available at anthropic.com/legal/privacy.
The extension requests:
storage, for your settings, history, and temporary results.sidePanel, for its interface.scripting, to load its scripts into a listing tab that was already open.activeTab, for temporary access to the current tab when you use the
extension.If this policy changes, the updated version will be posted at this URL with a new "Last updated" date.
Questions? Contact nicholasbelous@gmail.com.