Marketplace management services for sellers whose channels do not know about each other
Every channel you sell on keeps its own copy of your catalogue, its own stock number, its own price and its own idea of what your product is called. Individually they all work. Together they contradict each other, and the contradictions arrive as oversells, cancellations and a metric penalty on the platform you can least afford to lose.
We run the layer none of the platforms provide: one catalogue, one stock number, one set of rules about who gets the last unit.
One catalogue behind every channel, a stock number that cannot oversell, and profit compared like for like once each platform has taken its cut.
What are marketplace management services?
Marketplace management services run a seller's presence across several marketplaces as one operation rather than several: a single source of truth for products, stock and pricing, rules for how that data is translated into each channel's requirements, and one profit view that lets you compare channels honestly after their very different fees.
The distinction worth drawing is between depth and breadth. Amazon account management or eBay account management go deep on one platform: its algorithm, its policies, its advertising. This page is about what happens between them, which is where most of the damage occurs and where no platform has any incentive to help you.
If you sell on exactly one marketplace, you do not need this. Go to the platform page instead and spend the money there.
Nobody is short of channels, they are short of one version of the truth
Adding a channel is easy and every platform makes it easier every year. What nobody warns you about is that a second channel does not add a second stream of orders to the same business, it creates a second business with its own copy of your data that immediately starts drifting from the first one.
Stock is the obvious one. Four channels each showing the same twelve units are collectively promising forty eight. Most of the time you get away with it, because most of the time you do not sell out. The damage arrives on your best day, when demand finally arrives all at once and you cancel your way through it. Cancellations are not a customer service problem on a marketplace, they are a metric, and metrics decide visibility.
Then there are the quieter ones. A price you changed in three places and forgot in the fourth. A product renamed on one channel so its reporting no longer matches anywhere else. A bundle that exists as one SKU here and three there, so your stock maths is wrong in a way no report will show you. A channel you are convinced is your best performer because you have never subtracted its fees.
There is no such thing as real-time stock synchronisation. Channels poll and update on their own schedules, so between one update and the next every platform is working from a number that is already slightly out of date. That gap is why the working answer is a deliberate buffer on the channels that punish you hardest, rather than a faster sync you cannot actually buy.
The oversell is the visible cost
Cancellations and late dispatches land on seller metrics. On most marketplaces those metrics gate search placement, so a stock error becomes a visibility problem that outlasts the incident by months.
The catalogue drift is the expensive one
When the same product is described differently on every channel, nothing reconciles. You cannot compare performance, spot a pricing error or fix anything once rather than five times.
Fees make channels incomparable
Referral fees, fulfilment fees, mandatory advertising percentages and payment processing all differ. Revenue by channel is a misleading number, and it is the number most sellers steer by.
Every platform optimises for itself
Each one wants your best price, your stock priority and your attention. Nothing in any seller dashboard is designed to tell you that a different channel would have been better.
Fix these in sequence, because later ones depend on earlier ones
Most multichannel problems get attacked in the wrong order, which is why they keep coming back. Stock cannot be trusted until the catalogue is reconciled, and channel decisions cannot be made until profit is measurable.
1. One catalogue
A single master record per product with a stable identifier, and every channel's version mapped back to it. Nothing else on this list works until this exists.
2. One stock number
Available quantity held in one place and pushed out, with buffers on the channels that punish oversells hardest. This is the change that stops the bleeding.
3. Pricing rules, not prices
Prices set by rule from cost and channel fees rather than typed in five times. A rule can be corrected once, a typed price has to be found first.
4. Channel data mapping
Each marketplace wants different attributes, categories and title formats. Mapping is where product listing work becomes repeatable instead of manual.
5. Fulfilment routing
Which orders ship from where, and what each channel has been promised. Covered properly on eCommerce fulfilment.
6. Profit by channel
Revenue minus every fee, per channel and per SKU. Only now can you decide where the next unit of stock or attention should go.
Sellers usually want to start at six because it is the interesting one. Starting at six with an unreconciled catalogue produces a confident answer built on numbers that do not mean the same thing.
Who gets the last unit
When stock runs low, some channel is going to be disappointed. Almost every seller leaves this to whoever happens to order first, which sounds fair and is actually the worst option available, because the channels differ enormously in what a cancellation costs you.
A cancelled order on a marketplace with strict seller metrics can suppress your listings for weeks. The same cancellation on your own store costs you one apology and a refund. So the rational policy is to protect the strict channel with a stock buffer and let your own store take the risk, which is exactly the opposite of what most sellers do, because their own store feels more important to them.
This is a business rule, not a software setting. We write it down with you, then implement it, so that when the busy week arrives the answer is already decided rather than improvised at seven in the morning.
How our marketplace management services run
Reconcile the catalogue
Every channel's product list pulled together and matched to one master record. This is unglamorous and it is where the real problems surface, usually as products nobody knew were still listed.
Centralise stock and set buffers
One available quantity, pushed everywhere, with per-channel buffers sized by what an oversell actually costs on that channel.
Write the rules down
Pricing rules, stock priority, what happens when a supplier is late. Agreed with you rather than assumed, because these are commercial decisions wearing an operational disguise.
Run it and report profit
Daily operations across channels, with a monthly view of profit after all fees per channel and per SKU, which is the number that should drive what you do next.
A common first-quarter outcome is closing a channel. If it cannot carry its own fees on your catalogue, running it well is still worse than not running it.
What our marketplace management services include
Catalogue reconciliation
One master record per product, every channel mapped to it, duplicates and abandoned listings found and dealt with.
Stock synchronisation
A single available quantity with per-channel buffers, so the same twelve units stop being advertised as forty eight.
Pricing rules
Prices derived from cost and channel fees, maintained centrally, so a margin decision is made once rather than five times.
Listing and content operations
New products published to every channel in that channel's format, and changes propagated rather than retyped.
Seller metric monitoring
Defect rates, late dispatch, cancellations and policy warnings watched across every account, because these gate visibility everywhere.
Profit by channel and SKU
After referral fees, fulfilment, advertising and payment processing. The report most sellers have never had and immediately act on.
Tooling selection and setup
Choosing and configuring the listing or inventory platform that fits your catalogue, rather than defaulting to whichever one we resell.
New channel launches
Adding a marketplace properly, with the data model and stock rules extended first rather than bolted on after the first oversell.
Written operating rules
Stock priority, pricing policy and escalation, documented so the business does not depend on one person remembering.
When you do not need marketplace management
You sell on one channel
There is no synchronisation problem to solve. Depth on that platform will earn more than a coordination layer over a single thing.
Your catalogue is tiny
With a handful of SKUs, a spreadsheet checked each morning genuinely works. Buy the software when the manual version starts failing, not before.
You make to order
If nothing is held in stock, the oversell problem largely disappears and your constraint is capacity. That is a different conversation and a cheaper one.
The second channel is not viable
Sometimes the honest finding is that a channel's fees do not fit your margins at all. Then the fix is closing it, not managing it better.
Before committing to anything, put your real numbers into our eCommerce profit margin calculator for each channel separately. If two channels look very different once fees are subtracted, that gap is usually worth more than any efficiency we could add.
The rest of the cross-platform work
Product Listing Services
Getting the catalogue onto every channel in that channel's format, at volume, without retyping it five times.
Get my catalogue listed →eCommerce Fulfilment
Where orders ship from, what each channel was promised, and whether a 3PL beats doing it yourself.
Sort out my shipping →eCommerce PPC Management
One advertising budget split across channels that each claim credit for the same sale.
Fix my ad spend →eCommerce CRO
Turning the traffic you already pay for into orders, on the store you actually control.
Raise my conversion rate →Customer Service Outsourcing
Response times that are seller metrics in disguise, handled by people who know the platform rules.
Cover my inbox →eCommerce Management
The pillar service, and the place to start if you are not sure which of these you actually need.
See the whole picture →How much do marketplace management services cost?
Priced on catalogue size and channel count, since those drive the work far more than revenue does. A thousand SKUs across four channels is a bigger job than a hundred SKUs turning over more money.
Audit and reconciliation
$1,200 to $4,000 once. Catalogue matched across channels, duplicates found, stock and pricing errors surfaced, profit by channel calculated properly for the first time.
Setup and migration
$3,000 to $12,000 once. Central catalogue and stock in place, channel mappings built, pricing rules implemented, operating rules written down.
Ongoing management
$1,500 to $6,000 a month. Daily operations across channels, new products published everywhere, metrics watched and monthly profit reporting.
Inventory or listing software is a separate subscription paid to the vendor. We will tell you when your catalogue is small enough not to need one, which is more often than the software companies suggest.
Common questions about marketplace management
Hold available quantity in one system and push it out to every channel, rather than letting each channel keep its own number. Then add a buffer on the channels where a cancellation does the most damage, so the last few units are protected on the strict platforms and the risk falls on the one you control. Perfectly real-time synchronisation does not exist because channels update on their own schedules, which is exactly why buffers rather than optimism are the working answer.
A spreadsheet genuinely works for a small catalogue on two channels if someone checks it daily. It stops working when SKU count, channel count or order volume rises, and the failure is usually sudden rather than gradual: the first busy week produces oversells. Buy software when the manual process is failing or clearly about to, and choose it on how well it models your products rather than on feature lists.
The one whose fee structure fits your margins and whose buyers already search for what you sell, which is often not the biggest one. Work out what a typical order would leave you after that channel's referral, fulfilment and advertising costs before you look at its traffic numbers. A channel that cannot pay for itself on your catalogue will not improve with volume, it will just lose money faster.
Not necessarily, because the fees are not the same everywhere and identical prices mean different margins. Two constraints matter: some marketplaces have policies about pricing an item lower elsewhere, and buyers do compare, so large unexplained gaps damage trust. The workable approach is pricing by rule from cost and channel fees, which keeps margins consistent even when the numbers on the page differ.
Usually yes, for reasons that do not show up in the revenue comparison. Your own store gives you the customer relationship, the email address, the ability to change anything without a policy review, and a place to go if an account is ever restricted. Marketplaces give you demand you cannot generate yourself. Most durable businesses run both and treat the marketplaces as acquisition rather than as the whole company.
The stock fix can often be in place within weeks, because it is the narrowest change and the most urgent. Full catalogue reconciliation takes longer and scales with how much drift has accumulated, which typically means a month or two of unglamorous matching work for a few thousand SKUs. Resist the temptation to do the interesting reporting first, since reports built on unreconciled data are confidently wrong.
In most cases yes, and we would rather fix the configuration of a tool you already pay for than migrate you to another one. Migrations are expensive, disruptive and frequently sold as a solution to what is actually a data problem that will follow you across. We recommend changing platforms only when the current one genuinely cannot model your products or channels.
Find out where your channels disagree
Give us access to your channels and we will match your catalogue across them, show you where stock and prices contradict each other, and calculate what each channel actually leaves you after fees. Most sellers find at least one channel is worth less than they thought and one product is worth considerably more.
Get my free multichannel audit- Catalogue matched
- Stock conflicts found
- Profit by channel