How to choose the right marketplace agency?

Criteria to consider before you begin

Before choosing a marketplace agency, check:

• his practical experience on several marketplaces,
• the diversity and consistency of its services,
• the quality of its tools and certifications,
• its transparency in communication and monitoring,
• its business-oriented, profitability-focused approach,
• and its ability to build a lasting and clear relationship.

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Choosing a marketplace agency: a key decision

Choosing a marketplace agency is not a matter of intuition.
It's a deeply strategic decision that will determine your speed of execution, your profitability, and your ability to grow over the long term.

Entrusting your marketplaces to an agency is like entrusting a part of your brand, your margins, and your reputation.
It's not just a service provider: it's a growth partner .

To make the right choice, it's best to analyze the evidence: verifiable results, a clear method, reliable tools, and a message consistent with your objectives.

1. Proven experience across multiple marketplaces

A competent marketplace agency knows that each platform has its own rules, priorities, and algorithmic mechanisms.
What works on Amazon doesn't necessarily translate directly to ManoMano or Zalando.

What this implies

Look for agencies capable of demonstrating:

• a mastery of the codes specific to each platform , whether it be logistics (FBA, LVB, dropshipping), product content or advertising strategies;
• concrete multi-country experience , because selling in Germany, the Netherlands or Spain does not meet the same requirements;
• Quantifiable results : increased revenue, optimized ACoS, higher conversion rates, cross-border development.

Why this is crucial

Multi-marketplace experience is not simply a list of logos on a website.
It requires a deep understanding of the technical, fiscal, and operational constraints specific to each environment.

An agency that has supported clients on Amazon, Cdiscount, Zalando, Kaufland or Bol will inevitably have developed a cross-cutting understanding of performance levers , a valuable asset when you want to balance growth and profitability.

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2. A comprehensive range of services truly tailored to your needs

Most companies look for an agency to "manage their marketplaces."
But management is only a fraction of the job.
A good agency structures, guides, and optimizes .

Essential services

A high-performing marketplace agency offers:

• A personalized initial audit : catalogue, margins, positioning, competition, priority channels.
• An entry or growth strategy : choosing relevant marketplaces, analyzing potential ROI, adjusting pricing.
• Complete optimization : content (SEO), Ads, logistics, product flow management, competitive intelligence.
• Internal support : skills transfer, increased autonomy, team training.
• Why personalization matters

Two brands in the same sector never have the same profit margin structure or the same level of digital maturity.
A reputable agency must therefore know how to tailor its support :
more strategic for well-established brands, more operational for those just starting out.

The right indicator? The agency always starts by asking specific questions, not by selling a “standard package”.

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3. Tools and technologies capable of tracking performance in depth

Marketplaces generate a massive amount of data: sales, margins, returns, visibility, positioning, advertising.
Without a robust technical infrastructure, it's impossible to extract useful insights from this data.

What you should expect from a specialist agency

• An expert marketplace agency relies on reliable tools to:
• manage product feeds (Lengow, Channable, BeezUP, Mirakl Connect…);
• analyze performance via customized dashboards;
• monitor the competition : prices, stock, Ads campaigns, seasonal trends;
• automate catalog updates to reduce manual errors.

Some agencies go further: they develop their own internal tools to fill the reporting gaps of marketplaces , which are often partial or too aggregated.

Why these tools matter

Technology isn't a marketing ploy; it's a prerequisite for effectiveness.
An agency that masters its technical stack is faster at diagnosing problems, detecting anomalies, and adjusting its actions.
It gains responsiveness, which, on a marketplace, translates directly into performance.

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4. Verifiable certifications and recognition

A recognized marketplace agency does not need to declare itself “expert”: its certifications speak for themselves.

The main labels

• Amazon Ads Advanced Partner : guarantees complete control of retail media levers and priority access to new products.
• Mirakl Partner : demonstrates expertise in multi-marketplace environments and robust technical integrations.
• Lengow or Channable Partner : proof of mastery of product flows and e-commerce data.

Why this is an important criterion in terms of support

These partnerships are secured after technical assessments, training, and verified performance.
They reflect operational rigor, but also recognition from the platforms themselves , which rely on these agencies to disseminate best practices in the market.

An agency without certification is not necessarily incompetent, but a certified agency has demonstrated its reliability to demanding third-party stakeholders.

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5. Clear, guided and transparent collaboration

The quality of a partnership is measured by how it is structured on a daily basis.
A marketplace agency must be able to provide you with constant visibility into what is being done, the results achieved, and the next steps.

What this covers

• A dedicated , accessible contact person who is familiar with your case and your objectives.
• Regular check-ins , weekly or monthly depending on the pace of activity.
• Readable reports , built around your key indicators.
• Direct access to your marketplace and advertising accounts.

What to avoid

An agency that only communicates via email.

Figures presented without context.

A report that only addresses advertising performance, without business analysis.

Transparency isn't just about data; it also relies on the ability to explain trade-offs, strategic choices, and performance gaps .
A good agency doesn't hide bad weeks; it analyzes them, corrects them, and uses them as a learning opportunity.

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6. A data-driven approach focused on profitability

On a marketplace, data is everywhere, but you still need to know how to read it.
An expert marketplace agency doesn't just track KPIs: it connects them to the reality of your business.

The right indicators

Revenue and actual margin (not “gross”).

Conversion rate, Buy Box share, ROAS, ACoS.

Content quality and SEO performance.

Return rates, customer reviews, profitability per product.

This data must be analyzed in light of your objectives: conquest, profitability, launch, or upgrading.

The winning methodology

A reputable agency never promises a “guaranteed” ROI.
It proposes a roadmap : optimization cycles, weekly adjustments, and monthly reviews.
This iterative approach—observe, understand, correct—allows for the development of stable and measurable growth.

A data-driven agency doesn't follow the numbers: it interprets them and acts.

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7. Reputation, credibility and customer feedback

The best indicator of reliability remains what those who have already worked with the agency say.

Before signing, take the time to check:

Google reviews and LinkedIn testimonials ;

public case studies ;

the average duration of collaborations.

A relationship that lasts for several years speaks volumes about the quality of the service.
Solid agencies don't hide their clients; they talk about them, backed by figures.

If possible, ask to speak directly with a brand that is supported: nothing replaces on-the-ground feedback to assess responsiveness, pedagogy and the quality of reporting.

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In short: choose based on evidence, not promises

Selecting a marketplace agency is much more than a request for proposals.
It's a strategic choice that impacts your results and your teams.

Key criteria to keep in mind:

proven multi-marketplace experience ,

tools and certifications ,

a transparent methodology ,

an ROI and profitability-oriented approach ,

and a relationship based on trust and education .

A good partnership is built on facts: clarity, regularity, mutual commitment.

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Need a diagnostic or benchmark? Think eTAIL agency

eTAIL agency supports brands and distributors on all European marketplaces: Amazon, Cdiscount, Fnac-Darty, Zalando, ManoMano, Maisons du Monde, Kaufland, Bol, Conforama…

Our experts develop marketplace strategies based on data, performance, and transparency.
We help brands run their business in a profitable, structured, and sustainable way.

👉 Contact us to challenge your strategy and identify the growth levers to activate.

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