Amazon EU Buy Box Monitor

Problem

A sporting goods brand sells across ten Amazon marketplaces in Europe (UK, Germany, Netherlands, France, Italy, Spain, Sweden, Poland, Belgium, Ireland). Each marketplace has its own Buy Box winner, its own list of competing offers, and its own inventory situation. Checking all of that by hand every week across hundreds of listings is not realistic, and the off-the-shelf tools that try to do this cost hundreds of dollars a year per seat and still do not show the picture the team actually needs.

The result was that Buy Box losses, undercut prices, and stockouts in the smaller EU markets were getting noticed late, after sales had already dropped.

Approach

Every Monday at 9 AM Eastern, a scheduled job pulls offers, pricing, and inventory through Amazon’s official Selling Partner API for every active SKU in every EU marketplace, then sorts each one into a clear bucket:

• Has the Buy Box
• Out of stock, broken out by what is happening (no inbound on the way, inbound on the way, in transfer between fulfillment centers, low stock)
• Undercut by a competitor, or priced correctly but losing for another reason

The output is a single Excel workbook with one tab per marketplace, key markets at the top (UK, Germany, Netherlands), auto-filters on every column, and clickable ASIN links straight to the listing on the right country’s Amazon site. A short email summary goes out to the distribution list every Monday with the workbook attached.

Result

• Ten EU marketplaces monitored every Monday, automatically, with no manual checking
• One workbook surfaces every Buy Box loss, undercut price, and stockout across the region in one place, with key markets pinned to the top
• Runs on free cloud infrastructure (a scheduled GitHub Actions job), so the ongoing cost is essentially zero
• Problems in smaller markets that used to slip past for weeks now show up in the same Monday email they happen in