Marketplace Monitoring Software | NetMonitor by Lengow

Why Marketplace Monitoring Is Essential

With thousands of SKUs, hundreds of sellers, and dynamic pricing, marketplaces are among the most challenging yet most impactful channels to control.

Rogue sellers hijacking listings: Sellers who take over your product listings can damage brand identity and divert sales.
Price wars driven by Buy Box competition: Competing for the Buy Box often triggers aggressive discounting that hurts all sellers.
Inconsistent product visuals and descriptions: Variations in images, titles, or specs confuse customers and reduce conversion.
Stock manipulation: Sellers may inflate stock levels or hide low stock to gain visibility or pricing advantage.

According to industry studies, 75% of sellers offering branded products are unauthorized. ORIS Report

Brands without Buy Box control on Amazon experience on average 35% lower return on ad spend. Spreetail report

What NetMonitor Tracks on Marketplaces

Seller Activity

Who’s selling your products, and are they authorized?

Product Content

Monitor titles, images, descriptions for accuracy

Buy Box Visibility

Understand if and when your listings lose control

Pricing & Discounts

Detect undercutting and MAP violations

Stock Availability

Track inventory status for key sellers

How It Works

NetMonitor automates marketplace audits so you can detect issues faster and take action without the manual overhead. The system operates as follows:

Scans marketplaces daily or hourly for high-priority SKUs
Matches products using AI, even when GTINs are missing or incomplete
Captures seller identity, pricing details, and full PDP content
Sends alerts on pricing, content, or seller violations
Logs visual and structured evidence for each affected SKU

All data integrates seamlessly into your BI or CRM stack for reporting, enforcement, and internal alignment.

Supported Marketplaces

NetMonitor covers all major generalist marketplaces — plus additional local or niche platforms on request.

Amazon (all regions)
Cdiscount
Fnac
Bol.com
eBay
Allegro
Rakuten
ManoMano
Other regional marketplaces upon request

What You Can Achieve

Detect unauthorized listings within hours

Prove and respond to Buy Box loss

Enforce content consistency across regions

Support sales partners with shared data

Protect margins during promos or retail events

Why is it so difficult to monitor brand activity on marketplaces?

Because marketplaces are highly dynamic environments. Product pages can change daily, sometimes even hourly. Dozens of unauthorised sellers can list your products with outdated visuals, incorrect descriptions, or aggressive pricing without your consent. Without a dedicated system, tracking these fluctuations manually across hundreds of SKUs and multiple platforms becomes overwhelming and inefficient.

What can NetMonitor track across marketplaces?

NetMonitor tracks everything that affects your brand on marketplaces: it scans seller identities, listed prices (including shipping and taxes), stock availability, and PDP content such as images, titles, and descriptions. Using AI, it matches your products even when listings are incomplete or GTINs are missing. It then alerts you to any violation or anomaly, with screenshots and structured data to back it up.

What business value does marketplace monitoring provide?

Brands using NetMonitor gain real-time visibility into how they’re represented on marketplaces like Amazon, Bol, Cdiscount, or eBay. That means faster detection of pricing violations, better enforcement of branding rules, and more control over what customers actually see. For example, Clarins used NetMonitor to monitor price dynamics and content consistency across authorised and unauthorised sellers improving both operational responsiveness and strategic decision-making.