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Most brands that hire an Amazon agency end up disappointed. Not because agencies are universally bad, but because the selection process is broken. The sales deck promises senior strategists, dedicated account management, and double-digit growth. Then month two arrives, and the person you met during the pitch has moved to another account. The reporting deck shows ACoS and ROAS but nothing about whether your business is healthier. The contract you signed has a 12-month lock and an auto-renewal clause you missed.
This guide is written from the operator side of the table. SupplyKick has run Amazon accounts for 13+ years. We've seen what works, what doesn't, and what brands wish they had asked before signing. If you're evaluating agencies right now, this is the framework that cuts through the sales layer and shows you what actually matters.
Why Most Brands Get Agency Selection Wrong
The SERP and Reddit Problem
Search "amazon fba agency" on Google and look at what ranks. Reddit threads sit at or near the top. The #1 organic result is often a frustrated brand owner asking r/FulfillmentByAmazon how to find an agency that actually answers the phone after the sale closes. Google even surfaces a "What People Are Saying" block with more Reddit commentary.
That tells you something important: buyers don't trust agency marketing copy on its own. They want to hear from other brands who've been through it.
The Reddit threads surface the same concerns over and over:
- Agencies promise senior oversight, then assign junior coordinators to smaller accounts
- Many agencies won't take brands under $50k/month in sales
- Real optimization takes three to six months, but agencies sell it like results show up in week two
- Pricing is opaque and full of surprise fees
- Long lock-in contracts with auto-renewal traps
Those aren't universal problems, but they're common enough that Google ranks buyer complaints above agency websites.
Why "Best Agency" Lists Don't Solve the Real Problem
Most of the educational content on this topic is either a listicle (7 Best Amazon Agencies!) or a guide written by an agency trying to rank for the keyword. The listicles help you scan names but don't teach you how to evaluate fit. The agency-written guides stay clean and avoid the uncomfortable parts like contracts, staffing, and what happens when things go wrong.
This article does the opposite. It assumes you're past the "should I get help?" stage and ready to figure out which model fits, what fair pricing looks like, what questions expose weak agencies, and what the first 90 days should produce.
What an Amazon FBA Agency Should Actually Do
Ads, Listing Work, and Account Management
At minimum, an Amazon agency handles Sponsored Products, Sponsored Brands, and Sponsored Display campaigns. That means keyword research, bid management, negative keyword pruning, campaign structure, and performance reporting.
Many agencies also manage listing optimization (titles, bullets, backend search terms, A+ content), product photography, and storefront design. Some handle Amazon DSP (demand-side platform) for display and video ads, which requires more sophisticated attribution and a higher ad spend threshold.
Account management usually means someone monitors your Seller Central health, watches for suppressed listings, tracks inventory levels, handles case escalations, and keeps your account in good standing with Amazon's policies.
Where Operations and Logistics Enter the Picture
Full-service agencies go deeper. They help with FBA replenishment planning, demand forecasting, supply chain coordination, and margin analysis. They track your landed costs, storage fees, and whether your products are sitting in long-term storage eating into profit.
Some agencies also manage your Amazon Vendor Central account if you sell through 1P (first-party). That's a different operational model with its own pricing structures, chargebacks, and co-op negotiations.
If your biggest bottleneck is ad performance, a PPC-only shop might be enough. If your problem is forecasting, inventory, catalog hygiene, and account health all at once, you need broader operational support.
What a Full-Service Agency Is Not Responsible For
Agencies don't manufacture your products. They don't handle your off-Amazon sales channels unless you pay for that separately. They don't manage your books, file your taxes, or run your HR.
They also can't guarantee specific sales numbers or rankings. Amazon's algorithm changes constantly, and competitor behavior affects your performance. Any agency that promises guaranteed rankings or ROAS targets without qualifying conditions is either lying or inexperienced.
What a good agency can promise: structured testing, regular reporting, operational discipline, and a process that improves your baseline over time.
Which Model Fits Your Brand Right Now
Full-Service Agency
You need this if your Amazon operation touches ads, content, catalog management, inventory forecasting, and account health all at once. Full-service agencies assign account teams that handle the full scope and coordinate across functions.
This makes sense if you're doing $50k+ per month in Amazon revenue, have multiple SKUs, and don't have internal staff who can own the day-to-day Amazon workload.
Pricing: $3,000 to $5,000/month flat retainer, or a hybrid model combining a base fee with a percentage of ad spend. Some agencies use pure percent-of-spend pricing, which scales with your budget but can misalign incentives if the agency pushes spend without improving efficiency.
PPC Shop
If ads are your only real problem, a PPC-focused shop costs less and moves faster. These agencies specialize in campaign structure, keyword strategy, bid optimization, and performance reporting. They don't touch your listings, supply chain, or account health.
This works if you already have strong product content, clean inventory management, and decent organic rankings. You just need someone to run the ad engine more efficiently than you're doing in-house.
Pricing: Percent-of-spend (10% to 20% of your monthly ad budget is common) or a flat monthly retainer starting around $1,500 to $3,000 depending on complexity.
Creative Studio
If your listings look weak, your images are flat, your A+ content is bare-bones, and your storefront is an afterthought, you don't need an agency. You need a creative partner.
Creative studios specialize in product photography, lifestyle shots, infographics, video, A+ content, and storefront design. They usually charge per project (a listing refresh might run $500 to $2,000 depending on scope) or a monthly retainer if you need ongoing creative output.
Pair a creative studio with a PPC shop and you've effectively built a full-service solution without paying for one agency to do everything.
Consultant or Fractional Lead
Some brands need strategy and oversight more than execution. A consultant or fractional Amazon lead can audit your account, build the roadmap, set up processes, and coach your internal team without taking over daily operations.
This works if you have bandwidth in-house but lack Amazon-specific expertise. Consultants usually charge hourly ($150 to $300/hour is typical) or a monthly retainer ($2,000 to $5,000 depending on involvement).
The downside: you still need someone internal to execute. A consultant won't log into Seller Central every day and adjust bids. They'll tell you what to do, then your team has to do it.
First In-House Hire
If you're doing $100k+ per month in Amazon revenue and plan to keep growing, hiring an internal Amazon manager often makes more sense than outsourcing indefinitely.
An internal hire owns the relationship with Amazon, learns your business deeply, coordinates with your supply chain and finance teams, and doesn't disappear when the contract ends. You'll pay $60k to $90k per year for a mid-level Amazon manager, plus benefits.
The tradeoff: one person can't do everything. You'll still need agency or freelance support for creative, DSP, or specialized projects. But you'll have someone in-house who owns the strategy and holds external partners accountable.
How to Evaluate an Agency Without Getting Sold by the Deck
Team Structure and Who Touches the Account Each Week
Ask who will actually work on your account after the contract is signed. Not "our team," not "we have senior strategists," but specific names and roles.
- Is this person dedicated to my account or rotating across multiple brands?
- How many accounts does this person manage at once?
- What happens if this person leaves the agency?
- Do I get direct access to them, or does everything go through an account coordinator?
Small accounts ($20k to $50k/month) often get assigned to junior staff or rotating coordinators. That's not inherently bad if the agency is upfront about it, but it's a problem if they sold you on senior oversight during the pitch and delivered something different.
Case Studies, Category Fit, and What Proof Is Real
Every agency shows case studies. Most of them are useless.
Look for:
- Category relevance (an agency that crushed it in supplements might not know how to sell furniture)
- Time horizon (did they show results in 30 days or 12 months?)
- Baseline context (going from $10k to $30k is impressive; going from $500k to $550k might just be seasonal growth)
- Specifics (did they fix catalog issues, restructure campaigns, improve content, or just ride a trending product?)
Ask for references in your product category with similar revenue range. Talk to those brands. Ask what the agency did well, what they struggled with, and whether they'd hire them again.
Partner Directory Status, Certifications, and AMC Depth
Amazon has an official Ads Partner Directory. Check if the agency is listed. Look for:
- Official partner status (not just "we use Amazon Ads")
- Certifications (Amazon Ads Academy issues badges for Sponsored Ads, DSP, Amazon Marketing Cloud)
- AMC experience (Amazon Marketing Cloud is Amazon's clean room for advanced analytics and custom targeting work)
Most agencies can run Sponsored Ads campaigns. Fewer can handle DSP well. Even fewer know how to use AMC to build custom targeting groups, measure incrementality, or run long-window attribution analysis.
If your brand is sophisticated and you're spending $50k+ per month on ads, AMC capability matters. If you're spending $5k/month, it doesn't yet.
Reporting, Business Reviews, and What Metrics Should Be Visible
Ask what the reporting cadence looks like. Weekly updates? Monthly business reviews? Quarterly deep dives?
Then ask what metrics they track. If the answer is only ACoS and ROAS, that's a red flag. You also need to see:
- Total sales (not just ad-attributed sales)
- Organic rank movement
- Inventory health (in stock rate, aged inventory)
- Account health score
- Margin and profitability (especially if fees or storage costs are eating into gains)
The best agencies connect ad performance to business outcomes. They don't just show you that ACoS dropped from 30% to 25%. They show you that your total profit improved because you launched a new SKU, fixed a listing suppression, and cut long-term storage fees.
The Questions You Should Ask Before Signing
About Their Process (Onboarding, Strategy, Execution)
What does the first 30 days look like? Most agencies should spend the first two weeks auditing your account, understanding your business model, mapping your supply chain constraints, and building a strategy roadmap.
If an agency promises results in week one, they're either working off a template or making things up. Real optimization takes time to diagnose, test, and measure.
- What's included in the onboarding audit?
- How do you prioritize what to fix first?
- How do testing and iteration work?
- How often do we review strategy vs. execution?
About Pricing (Retainers, Percentage Models, Hidden Fees)
Get the full pricing structure in writing before you sign.
| Model | How It Works | Typical Range |
|---|---|---|
| Flat retainer | Fixed fee regardless of ad spend | $2,000 to $10,000/month |
| % of ad spend | 10-20% of your monthly ad budget | $2k-$4k on $20k spend |
| Hybrid | Smaller retainer + percentage | $3,000 base + 8% of spend |
| Performance bonus | Bonus tied to specific goals | Varies by target |
- Is there a setup fee?
- Do you charge extra for creative, catalog work, or reporting?
- What happens if ad spend increases? Does the percentage cap?
- Are there minimums or penalties if I reduce ad spend?
About Contracts (Terms, Exit Clauses, Data Ownership)
Read the contract. Specifically, look for:
- Contract length: 3 months is reasonable for a trial. 6 to 12 months is standard for full-service. Anything longer than 12 months without a clear reason is a red flag.
- Auto-renewal clauses: Does the contract automatically renew unless you cancel in writing 30 or 60 days before the end? That's common but worth knowing.
- Exit terms: Can you leave early if the relationship isn't working? Is there a cancellation fee?
- Data ownership: Who owns the campaign data, creative assets, and reporting templates when the contract ends? You should own everything.
- Account access: Make sure you retain admin-level access to your own Seller Central and Advertising Console. The agency should never lock you out of your own account.
If the agency resists clear exit terms or tries to retain ownership of your data, walk away.
About Communication (Reporting Cadence, Escalation, Access)
How often will you talk to the team? Weekly check-ins? Monthly business reviews? Ad-hoc Slack or email?
Who do you contact when something breaks? If a listing gets suppressed, an ad campaign stops delivering, or a product goes out of stock, how fast does the agency respond?
- What's your average response time for urgent issues?
- Do I have direct access to the account manager, or does everything route through a coordinator?
- How do you handle after-hours or weekend emergencies?
- What does escalation look like if I'm not happy with performance?
Red Flags That Should Kill the Deal
Guaranteed Rankings or Sales Promises
No one can guarantee specific rankings or sales numbers on Amazon. The algorithm changes constantly. Competitor behavior affects your position. Seasonality, supply chain issues, reviews, and a dozen other factors influence outcomes.
If an agency promises "we'll get you to page one in 30 days" or "we guarantee 3x ROAS or your money back," they're either inexperienced or running black-hat tactics that will get your account suspended.
No Direct Access to Your Seller Central
You should always retain admin-level access to your own Seller Central account. The agency can have access too, but you should never be locked out or dependent on them to log in.
Some agencies ask for full control and restrict client access "to avoid conflicting changes." That's a bad sign. If they can't coordinate with you while you both have access, they don't have strong processes.
Black Hat Tactics (Fake Reviews, Keyword Manipulation)
Avoid agencies that offer fake reviews, review swaps, incentivized reviews that violate Amazon's terms, or keyword manipulation tactics (search-find-buy schemes, artificial click farms).
These tactics work until Amazon catches you. Then your account gets suspended, your ASINs get blacklisted, and the agency disappears because their contract says they're not liable for account health.
Ask directly: "Do you use any tactics that violate Amazon's terms of service?" If they hedge, walk away.
Vague Reporting or "Proprietary" Metrics You Can't Verify
If an agency shows you custom dashboards with metrics you can't verify in your own Seller Central or Advertising Console, that's a red flag.
They should show you real data pulled from Amazon's reporting tools, not invented KPIs that make their performance look better than it is. If they can't explain it clearly or won't show you the source data, they're hiding something.
What the First 90 Days With an Agency Should Look Like
Weeks 1-2: Audit and Onboarding
The agency should spend the first two weeks learning your business and auditing your account.
- Review your product catalog, listings, content, and images
- Audit your campaign structure, keyword targeting, and bid strategy
- Check your account health, suppressed listings, and policy compliance
- Analyze your inventory levels, fulfillment method, and storage costs
- Map your business goals, margins, and growth constraints
At the end of week two, they should present a strategy roadmap that prioritizes what to fix first and why.
Weeks 3-6: Strategy and Quick Wins
Weeks three through six are about implementing the roadmap and picking up quick wins.
Quick wins might include:
- Fixing obvious campaign structure issues (redundant campaigns, wasted spend on irrelevant keywords)
- Updating weak product titles, bullets, or backend search terms
- Launching new campaigns for high-priority products
- Cleaning up suppressed listings or account health issues
Don't expect massive sales growth yet. This phase is about fixing the foundation so optimization has room to work.
Months 2-3: Optimization and Measurement Baseline
Months two and three are when real optimization starts. The agency should be testing bid strategies, trying new keyword targets, adjusting budgets based on performance, and refining campaign structure.
They should also establish a measurement baseline. What's your average ACoS? What's your organic vs. paid sales split? What's your inventory turn rate? You need a baseline to measure improvement against.
- Clearer reporting and KPIs
- Evidence of structured testing (not just "we changed some bids")
- Improved efficiency (lower wasted spend, better keyword targeting)
- A roadmap for months 4 to 6
If you're not seeing progress by month three, the agency either misdiagnosed your problem or doesn't have the skills they claimed.
How Much an Amazon FBA Agency Costs in 2026
| Account Type | Revenue Range | Typical Agency Cost |
|---|---|---|
| PPC-only, small | $5k-$20k/month | $1,500-$3,000/month flat or 15-20% of ad spend |
| Full-service, mid-size | $50k-$150k/month | $3,000-$7,000/month flat or hybrid |
| Full-service, large | $200k+/month | $7,000-$15,000+/month |
If an agency quotes significantly below these ranges, ask what corners they're cutting. If they quote significantly above, ask what justifies the premium.
Flat Monthly Retainer Models
Flat retainers work well for smaller brands or brands with predictable workloads. You pay the same amount every month regardless of ad spend. The upside: predictable costs. The downside: if your ad spend or workload increases significantly, the agency might ask for a rate adjustment.
Percentage of Ad Spend Models
Many agencies charge a percentage of your monthly ad budget. Common rates are 10% to 20%. Example: if you spend $20,000/month on Amazon ads, you'd pay the agency $2,000 to $4,000/month.
The upside: the fee scales with your spend, so you're not locked into a high retainer when you're testing. The downside: this model can misalign incentives. An agency that gets paid more when you spend more might push budget increases without improving efficiency.
Ask the agency how they handle budget recommendations and whether they're incentivized to improve profitability or just maximize spend.
Hybrid Models and Performance Bonuses
Hybrid models combine a smaller retainer with a percentage of ad spend. Example: $2,000 base + 8% of ad spend. This balances predictability with scalability. The base covers non-ad work (account management, listing optimization, reporting), and the percentage covers ad management effort.
Some agencies also offer performance bonuses tied to specific goals (sales growth, ROAS improvement, new product launches). These can work if the goals are realistic and both sides agree on the baseline.
Frequently Asked Questions
How long does it take for an Amazon agency to show results?
Meaningful results usually take three to six months. The first two months are about fixing structural issues (campaign setup, catalog problems, account health). Months three through six are when optimization compounds and you see sustained improvement. Agencies that promise results in 30 days are either working with very broken accounts where quick wins are easy, or they're overselling.
Can I keep managing some things in-house while using an agency?
Yes. Many brands handle creative or inventory planning internally and outsource ads and account management. Just make sure roles are clear so you're not duplicating work or creating conflicts.
What data should I have ready before talking to agencies?
Pull these reports from Seller Central: last 90 days of sales and traffic, current campaign structure and ad spend, account health score, SKU list with prices, margins, and fulfillment method, and any recent suspensions, policy warnings, or suppressed listings. This helps agencies give you a realistic assessment during the sales call instead of a generic pitch.
Do Amazon agencies get access to my Seller Central account?
Yes. They need access to manage campaigns, update listings, monitor account health, and run reports. You should grant them user-level permissions, not hand over your login credentials. Make sure you retain admin access so you can audit their work and remove their access if the relationship ends.
What SupplyKick Does Differently
SupplyKick has managed Amazon accounts for 13+ years. We don't rotate junior staff across accounts. Every brand gets a dedicated senior account manager who knows your business, your supply chain, your margins, and your goals.
We handle the full scope: ads, listings, content, inventory strategy, account health, and catalog management. We don't upsell you on services you don't need, and we don't lock you into contracts that penalize you for leaving if the relationship isn't working.
Our pricing is custom based on your scope and complexity, not a rigid percent-of-spend model that incentivizes us to push budget without improving efficiency.
If you're evaluating agencies right now and want to talk to a team that treats Amazon management as operational work, not a marketing afterthought, we'd like to hear from you.
Talk to our team →/Logos/SupplyKick/SupplyKick-Logo_White.svg){kind=logo}