Privacy Policy

Last updated: May 31, 2026

SellerSync ("the Extension") is a Chrome extension built by Tinkrd LLC. We take your privacy seriously. This policy explains what data we collect, how we use it, and what we do not do.

Data we collect

The Extension stores the following data locally on your device only, using Chrome's built-in storage API:

• User preferences and settings (e.g. stale listing threshold, price drop percentage)
• Automation progress state (e.g. how many listings have been processed in a session)
• Subscription status (retrieved from ExtensionPay to determine free vs. premium access)

Data we do NOT collect

• We do not collect your Mercari login credentials or session tokens
• We do not collect personally identifiable information (name, address, email)
• We do not collect financial or payment information
• We do not collect browsing history outside of mercari.com
• We do not transmit any data to our own servers, we have none

Third-party services

The Extension uses ExtensionPay (extensionpay.com) to process subscription payments. When you upgrade to Premium, you interact directly with ExtensionPay's payment flow, and their privacy policy governs that interaction. We receive only a boolean indicating whether your account is active, no payment details.

Permissions used

• storage — saves your settings locally on your device
• tabs — detects when you are on your Mercari listings page
• host permission (mercari.com) — injects the automation script on Mercari pages only

Data retention

All data stored by the Extension lives in your browser's local storage. It is never transmitted externally. You can clear it at any time by removing the extension or clearing Chrome's extension storage.

Changes to this policy

We may update this privacy policy from time to time. Any changes will be reflected on this page with an updated date.

Contact

Questions? Email us at tinkrd.co@gmail.com or use our contact page.