How this service handles your data
Effective: 25 August 2026
What is stored?
A product-check query is used for the eBay API request and a 15-minute result cache. The first time you open the margin sheet, a browser-specific backup code is generated automatically. An optional nickname and the product names, links, prices, costs, and notes in the sheet are used to save and sync it. A short-lived request count is held in server memory for abuse protection.
How is it used?
It is used for margin math, candidate status, and CSV export, and your data is never sold. Vercel Web Analytics measures visits. On information pages where monetisation is enabled, Google AdSense and eBay Partner Network tools may also load.
Deletion and retention
You can delete an individual sheet from the sheet screen. To erase every record tied to a backup code, contact the operator and provide that code. There is no field for an eBay seller account name, and the user identifier from eBay account-deletion notifications is never stored in sheets or logs.
External links
Opening an eBay or marketplace link puts you under that service’s own privacy policy. Always confirm current price, shipping, stock, and selling policy on that service before buying or listing.
Advertising and affiliate links
Where Google AdSense is enabled, Google and its partners may use cookies or device information to serve and measure ads. A Google-certified consent message is used in regions where consent is required. eBay links may become EPN affiliate links; the operator may earn a commission from a qualifying purchase without changing your price. No ad units are placed on the margin sheet or quick-margin calculator.