Unauthorised Seller Monitoring | NetMonitor by Lengow

Why Unauthorised Sellers Are a Growing Threat

Unauthorised sellers are increasingly infiltrating online marketplaces and webshops and their presence can seriously disrupt your brand’s performance, pricing strategy, and partner relationships. According to industry data:

20–30% of marketplace sales are now driven by unauthorised sellers, often operating completely outside the brand’s visibility.

75% of sellers offering branded products are not part of any official distribution network or partnership program.

This growing presence of grey market sellers poses major challenges for brands:

They consistently sell below your MSRP.
They hijack Buy Boxes.
They display outdated or inaccurate product information.
They destabilise your entire channel strategy.

And worst of all, they’re invisible… until NetMonitor spots them.

What NetMonitor Tracks

Seller Identity & Legitimacy

Detect rogue or unapproved sellers across all monitored sources

Pricing Behavior

Identify sellers pricing below your MSRP.

Stock Manipulation

Expose fake “in-stock” tactics from grey-market players

Content Misuse

Spot misbranded or outdated visuals, specs, or listings

Multi-channel monitoring with full transparency

Unauthorised sellers can appear anywhere, not only on the largest marketplaces. This is why NetMonitor offers comprehensive monitoring of all relevant online channels, ensuring that no price violations or content misuse go undetected:

Marketplaces: Tracks listings on platforms such as Amazon, eBay and others where unauthorised listings most often occur.
D2C reseller webshops: Detects listings on independent webshops operated by third parties outside your official network.
Price comparison sites: Monitors price listings on aggregators such as Google Shopping to identify discrepancies and MAP violations.

How NetMonitor Detects and Reports Violations

NetMonitor automates the entire detection workflow, from initial scan to actionable insights. It gives brands full control over how unauthorised sellers are tracked and escalated:

Daily scans of digital shelves across all monitored channels.
AI-powered SKU matching to recognise your products, even with altered titles or formats.
Automatic alerts when sellers are misaligned with your pricing, branding, or distribution policies.
Proof capture with screenshots and URLs for each flagged listing.
Data delivery into your BI stack or CRM for structured follow-up and action.

What You Can Do with This Data

Take commercial action with proof of violation

Share reports with internal stakeholders or distributors

Feed alerts into compliance workflows and CRM tools

Inform channel strategies with reliable intelligence

Reseller Compliance

Control grey market sales by enforcing authorised reseller rules.

Brand Monitoring

Detect unauthorized usage of your brand on digital channels.

Distribution Channel Analysis

Spot breaches and hidden sellers in your distribution ecosystem.

Discover More NetMonitor Features

Why is monitoring unauthorised sellers so important for brands?

Unauthorised resellers represent a growing share of online sales and often operate without the brand’s knowledge or consent. They disrupt pricing policies, hijack Buy Boxes, and damage brand consistency by displaying outdated or inaccurate product content. Worse, their presence can erode trust with official partners.

Monitoring of these sellers empowers brands to regain control over their online presence, ensure consistency in pricing and content, and safeguard both margins and brand reputation.

What kind of online channels does NetMonitor cover?

NetMonitor doesn’t limit itself to major marketplaces. It provides full-spectrum visibility across:

Online marketplaces like Amazon or eBay,
D2C reseller webshops, including smaller and independent stores,
Comparison Shopping Engines such as Google Shopping.

This wide coverage ensures that your brand is protected across every touchpoint, with full visibility into pricing, stock, product presentation, and seller legitimacy.

What tangible results can brands expect from NetMonitor?

With NetMonitor, brands unlock real-time intelligence that translates into direct business impact. Teams can identify who is selling what, where, and under which conditions. This empowers them to detect violations quickly, react faster, and align strategy across markets.

Brands also benefit from improved coordination between sales, marketing, and operations teams, turning fragmented data into unified, actionable insight.