Evaluating Amazon FBA agencies is vendor due diligence rather than shopping. You are handing a company access to your account, your inventory decisions, and your advertising budget, so the process should look more like hiring a supplier than picking a service.
Most published guidance on this topic is written by agencies and concludes, remarkably, that you should hire an agency. We are an agency too, so the useful thing this guide can add is the parts that work against us: what to check that most agencies would rather you did not, which contract terms matter, and when the answer is not to hire one at all.
If you are hiring an individual rather than a company, that is a different process and our guide to hiring an Amazon account management expert covers it. If you are weighing software instead, our guide to Quartile versus an agency covers that comparison.
Before you evaluate anyone: define the job
Half the failed engagements we hear about were scoped badly rather than staffed badly.
Write down what you actually need. Listing work, advertising, inventory, account health, international expansion, or all of it. An agency will happily sell you everything, and paying for capability you do not use is the most common way this gets expensive.
Write down what success looks like. Profit, not revenue. Specify the metric before anyone quotes, because a target defined after the fact is a target the vendor will define.
Establish your baseline. Current conversion, TACoS, account health, and inventory position. Without it you cannot tell in six months whether anything improved. Our guide to interpreting business reports covers pulling that.
An account audit, from anyone, is a reasonable way to establish this before committing to a retainer.
What to actually check
Who does the work. The person in the pitch is frequently not the person in your account. Ask who your day to day contact will be, how many accounts they carry, and whether you can speak to them before signing. I’d treat reluctance here as decisive.
References you chose, not references they chose. Every agency has 3 happy clients. Ask for a reference in your category, at your size, and ideally one that ended. In my experience how a company describes a relationship that finished tells you more than any testimonial does.
Category experience, honestly assessed. Experience in your category helps, particularly in regulated ones. It is not decisive for most products, and an agency claiming deep expertise in every category has deep expertise in none.
Their own house. Look at how they present themselves. An agency whose own content is full of unsourced statistics and guaranteed outcomes is showing you their standards. We tested this heuristic against agencies we have replaced and it held every time, which is why I’d read a prospective vendor’s blog before their proposal.
What they would stop. Ask what they would kill in your account. Anyone can propose additions. Identifying spend worth cutting means they actually looked.
What they need from you. Photography, stock forecasts, approval turnaround, budget authority. Honest vendors name dependencies. Anyone promising results with no input is describing a fantasy.
The contract terms that matter
This is the section most sellers skim and later regret.
Notice period and exit. Thirty days is reasonable. Twelve month lock-ins with no break clause are a risk transfer from them to you.
Who owns the work. Campaign structures, creative assets, keyword research, and photography. Confirm in writing that you keep it. Some agencies leave a workable account behind and some leave a mess nobody wants to unwind.
Account access scope. Use Seller Central user permissions to grant only what the role needs, and revoke promptly when the relationship ends. Never share a primary account login.
Reporting cadence and format. A committed schedule, in writing, with agreed metrics. If nobody has committed to showing you numbers on a date, you will not see numbers.
What happens to your data. Their reporting tools may hold your history. Ask what you get back.
Fee structure specifics. Whether percentages apply to gross or net, whether ad spend is included, and what triggers a change. Our guide to Amazon store management costs covers the pricing models and what each one quietly incentivizes.
Red flags when evaluating Amazon FBA agencies
Guaranteed results. Nobody controls Amazon’s algorithm, your competitors, or your category. A guaranteed rank or revenue figure is a sales tactic, and I would end the conversation there.
Unverifiable scale claims. Managed millions, hundreds of brands, decades of combined experience. If a claim cannot be checked, treat it as decoration rather than evidence.
Precise predictions before seeing your account. A specific improvement percentage quoted in a first call is a number chosen to close, since nobody can know it yet.
Anything touching review manipulation. Incentivized reviews, review swaps, or arranging content from people connected to the business. All breach Amazon policy and the consequences reach your account, not theirs.
Pressure and deadlines. Discounts expiring on Friday tell you about their pipeline rather than about your opportunity.
No questions about your margins. An agency that has not asked about unit economics is planning to optimize revenue, and revenue is trivially bought with margin.
Reluctance to discuss failure. Everyone has an account that disappointed. An inability to describe one means inexperience or evasion.
Questions worth asking
- Who will work on my account day to day, and how many accounts do they handle?
- Can I speak to a client in my category, and one who left?
- What would you stop doing in my account in month one?
- How do you measure success, and what would make you tell me it is not working?
- What do you need from me, and what happens if I am slow to provide it?
- What does exit look like, and what do I keep?
The fourth question is the one I’d weight most heavily. A vendor who has thought about how they would tell you bad news is a vendor who intends to.
When not to hire an agency at all
Worth saying plainly, since this guide would be dishonest without it.
Your spend or revenue is small. Fees consume a share of budget that would produce more return spent on inventory or advertising. Run it yourself and learn what good looks like.
Your product has not proven it sells. Management is the wrong problem. Fix product-market fit first, which our guide to finding evergreen products covers.
You want execution without judgment. If you intend to set strategy yourself, software plus your own operator is cheaper and fits better.
You are not willing to be disagreed with. An agency worth hiring will challenge something in the first month. If that is unwelcome, both parties will be unhappy by month four.
Your real problem is elsewhere. Weak conversion, damaged account health, or a supply chain that keeps failing are not advertising problems, and no agency fixes them with a campaign restructure.
After you hire
Agree the first 90 days in writing. Audit, then fundamentals, then routine. Revenue in month one tells you very little.
Keep reading your own numbers. Delegating the work is sensible. Delegating your understanding of the account is not, and it is how sellers end up unable to evaluate the service they are paying for.
Review at 90 days against the baseline you established before starting. Not against the story, against the numbers.
If you want to talk it through, including whether you need us, our account management and advertising management pages set out what we cover, and an audit is the cheaper first step for most people.
FAQ
How do I evaluate an Amazon FBA agency?
Define the scope and your baseline metrics first, then check who does the day to day work, request references you choose rather than ones offered, ask what they would stop doing in your account, and read the contract terms on notice period, ownership of work, and account access.
What contract terms matter when hiring an Amazon agency?
Notice period and exit conditions, who owns campaign structures and creative assets afterward, the scope of Seller Central access granted, reporting cadence in writing, what data you get back, and whether percentage fees apply to gross or net and include ad spend.
What are the red flags with Amazon FBA agencies?
Guaranteed rank or revenue results, unverifiable scale claims, precise improvement percentages quoted before seeing your account, anything touching review manipulation, artificial deadlines, and no questions about your margins.
How much should an Amazon FBA agency cost?
Models range from monthly retainers to percentages of ad spend or revenue, with wide variation. What matters is total cost against incremental profit rather than the fee alone, and whether the fee structure incentivizes spending or profiting.
Should I give an agency full access to my Seller Central account?
No. Use Seller Central user permissions to grant only the access the role requires, never share a primary account login, and revoke access promptly when the relationship ends. Reluctance to work within scoped permissions is itself a warning.
When should I not hire an Amazon agency?
When your spend is small enough that fees would produce more return elsewhere, when the product has not proven it sells, when your real problem is conversion or account health rather than management, or when you are unwilling to be disagreed with.
Last updated: August 29, 2026. Agency pricing models, Amazon’s account permission structures, and platform policies change. ZonHack is an Amazon agency, so treat this guidance as informed but interested, and verify contract terms independently.
