Privacy Policy

Who we are

StackBuddy is a Chrome browser extension developed by Quickmitts Distribution, the legal entity behind SellerStack3P. Contact: sellerstack3p@gmail.com.

What information StackBuddy accesses

StackBuddy only operates on two specific websites:

• sellercentral.amazon.com — specifically Amazon's FBA Revenue Calculator pages (both the authenticated calculator at /revcal and the guest calculator at /revcalpublic). StackBuddy reads the ASIN and fee values displayed on that page (fulfillment fee, referral fee, storage fee, sale price) when you click the "Send to SellerStack3P" button.
• sellerstack3p.com — to receive an authentication token after you sign in and click Connect, and to send synced fee data to your account.

StackBuddy does not access any other websites, read your browsing history, capture keystrokes, or run in the background.

What data StackBuddy sends to SellerStack3P

When you click Send to SellerStack3P on Amazon's calculator page, StackBuddy transmits the following to your SellerStack3P account:

• The ASIN you looked up
• The Item price displayed on the calculator
• The FBA fulfillment fee
• The Amazon referral fee
• The monthly storage fee
• A timestamp of when the sync occurred

No other data leaves your browser.

What StackBuddy stores locally

StackBuddy uses chrome.storage.local (your browser's local storage) to remember:

• An authentication token (JWT) for your SellerStack3P account
• The email address associated with that account
• The timestamp of when you connected

This data stays on your device. You can clear it any time by clicking Disconnect in the StackBuddy popup, or by removing the extension from Chrome.

Authentication and security

The authentication token is generated by SellerStack3P after you sign in. It only grants permission to update your own ASIN fee data — it cannot read your account password, payment information, or perform other account actions. Tokens expire after one year, after which you'll be asked to reconnect.

All communication between StackBuddy and SellerStack3P happens over HTTPS.

What StackBuddy does NOT do

• It does not read your Amazon password or login credentials.
• It does not access your Amazon orders, customers, inventory reports, or any Seller Central pages other than the FBA Revenue Calculator.
• It does not track your browsing history or activity on other websites.
• It does not automatically sync without your explicit click.
• It does not include analytics, advertising trackers, or third-party scripts.
• It does not sell or share your data with anyone.

Permissions explained

StackBuddy requests the following Chrome permissions:

• storage — to save your authentication token locally so you don't have to sign in every time.
• Host permission for sellercentral.amazon.com — to inject the "Send to SellerStack3P" button on Amazon's FBA Revenue Calculator.
• Host permission for sellerstack3p.com — to send your synced fees to your account.

Data retention

Fee data synced to SellerStack3P is retained as part of your SellerStack3P account data, for as long as your account is active. You can delete this data at any time from within the SellerStack3P app by editing or removing the ASIN. If you close your SellerStack3P account, all associated data is removed.

Children's privacy

StackBuddy is intended for use by Amazon sellers, who must be 18+ to have a Seller Central account. We do not knowingly collect data from anyone under 18.

Changes to this policy

We may update this policy as the extension evolves. Material changes will be posted here with a new "Last updated" date. Continued use of StackBuddy after updates constitutes acceptance.

Contact

Questions about privacy? Email sellerstack3p@gmail.com.