eBay Amazon integration that keeps one stock count across both marketplaces
For sellers listing the same stock on eBay and Amazon. Amazon’s 20-character SKU is the tighter of the two codes, and anything Amazon holds in FBA keeps its own count: we send stock for those items and take changes back only for the ones you post. Amazon tells us the moment something sells, so eBay is corrected in a second or two. eBay does not announce a sale, so we check it every couple of minutes instead.
From $19 a month for two shops · no credit card · connected in about ten minutes · nothing changes until you say so · Updated 27 August 2026
eBay
AmazonHow to connect eBay and Amazon
Four steps and about ten minutes. The two connections are a login each; most of the time is us matching your catalogues, and nothing changes until you switch it on.
Connect eBay
You sign in to eBay and grant QuickSync access to the selling account.
Connect Amazon
You authorise QuickSync in Seller Central for the marketplaces you sell in.
Let it match your products
We line the two catalogues up by SKU, then by title, and hand you a short list of anything we could not match. You decide what happens to those.
Watch, then switch it on
Leave it watching for a few days and check the numbers agree. When you are happy, let it start making changes, one shop at a time.
What a eBay Amazon integration actually moves
One row per job, based on how QuickSync connects to eBay and Amazon today. Where a side does not allow something, the cell says so.
| What | eBay | Amazon |
|---|---|---|
| Stock count | Both ways | We always send, and hear back for items you ship |
| New listings | We can create and update | We can create and update |
| Prices | Sent, with your rule applied | Sent, with your rule applied |
| Orders in | Into QuickSync | Into QuickSync |
| Tracking back | Sent to the order | Amazon does not accept one from us |
| Photos and options | Photos, sizes and colours | Photos, sizes and colours |
| How fast we update it | A second or two | A second or two |
| How fast it tells us | We check every two minutes | The moment it happens |
Running two marketplaces from one warehouse by hand
Two marketplaces with two counts is how you oversell the same SKU in one afternoon. One warehouse number behind eBay and Amazon is the fix.
| Two shops, run by hand | Two shops, connected |
|---|---|
| The last one sells in both shops within the same hour | Whichever shop sells it, the other one drops to match |
| Typing the same stock numbers into eBay and Amazon each morning | One count, sent to both, without anyone opening a spreadsheet |
| Changing a price means editing the same product twice | Change it once and each shop gets the price you set for it |
| Orders in two dashboards, matched up by hand at the end of the week | Every order already matched to the right product |
| A refund leaves your numbers wrong until someone notices | A refund puts the stock back and tells both shops |
| Guessing how stale each shop’s number is | A sale on eBay is found within two minutes and Amazon is corrected straight after |
One eBay order, start to finish
Real timings, including the wait. A sale on Amazon is the quicker direction, because Amazon tells us and eBay does not.
eBay · order #447114:02:11eBay41sourceAmazon41+1.4sCorrecting Amazon takes a second or two once we have the sale. The order is in your packing list with the eBay order number on it, and a tracking number added later goes back to eBay on its own.
The other direction is faster: a sale on Amazon reaches eBay in a second or two, because Amazon pushes it to us the moment it happens.
The limits: know them before you connect
Every eBay Amazon integration has constraints. These are the ones that apply here.
eBay waits; Amazon does not
An Amazon sale reaches eBay in a second or two. An eBay sale reaches Amazon on our next look, which is within two minutes. Hold back a little safety stock and that window stops mattering.
Stock Amazon holds is left alone
We always send your count to Amazon, but we only take changes back for items you ship yourself. Anything Amazon stores and ships keeps its own count, which is Amazon’s to own.
Nothing publishes itself to eBay or Amazon
Copying a listing from eBay to Amazon (or the other way) always waits for you to look at it. Stock is the only thing that moves on its own, and only once you have turned it on.
Neither side will ship the other's orders
eBay and Amazon are both marketplaces, and that shapes what this connection can be.
eBay and Amazon are both marketplaces, and a marketplace only knows about the orders placed on it. Neither can be handed a sale that came from the other and asked to pick, pack and post it. That is how both platforms are built rather than a gap in what we do, and it is the first thing to settle before you plan a workflow around this pair.
What is left is the part that causes real trouble: one pile of stock, two listings and no shared count between them. QuickSync sits in the middle and corrects each side from the other. A sale on eBay lowers what Amazon shows, and for items you post yourself an Amazon sale does the same the other way. Orders from both marketplaces land in QuickSync, so you are not reconciling two dashboards by eye.
One side of this pair runs on a timer. eBay has no way to announce a sale, so it gets asked instead: every couple of minutes, stock and orders together. That is a short window rather than no window at all, and on the lines you sell fastest a unit or two of headroom is the cheap way to cover it while you get on with something else.
Twenty characters is the number that governs
eBay will take 50. Amazon takes 20, and the shorter side always wins.
Items pair up by SKU, so the shorter of the two limits is the one you have to design to. eBay will hold 50 characters. Amazon takes 20, which is the tighter limit in this pair by some distance. A SKU that fits eBay comfortably can still arrive at Amazon shortened, and a shortened SKU no longer matches the item it came from.
Nothing errors when this happens, which is what makes it awkward. We truncate at the channel’s limit rather than refusing to send, so the connection stays green and the item simply stops pairing with itself. You find out weeks later when one count has drifted away from the other. Twenty characters goes quickly if your SKUs are built out of words, so sort by length and look at the top of the list first.
Two more Amazon rules to plan around. We always send your count out to Amazon, but we only take changes back for items you ship yourself; stock Amazon holds and ships keeps its own count, deliberately, because Amazon knows what is on its own shelves. And Amazon has no field for a tracking number, so we cannot write one back. Tracking stays in QuickSync.
Two shops fits the smallest plan
Your catalogue size picks the plan, and your plan price covers two connected shops with every shop after that adding it again. Three shops on Lite is $38 a month.
Lite
$19/mo for two shops1,000 items and up to eight connected integrations, with stock matched on both sides automatically. Enough for eBay and Amazon on their own, at $19 a month for the two.
Pro
$29/mo for two shops2,500 items and up to eight connected integrations. Listings and orders sync here as well as stock. Most sellers running two shops properly end up here.
Ultra at $69 and Ultra+ at $99 add larger catalogues, price rules and setup help. Every plan starts with a 14-day free trial and no card.
Questions people ask about this pair
How quickly does Amazon update after something sells on eBay?
Within two minutes. eBay has no way of telling us the moment a sale happens, so we check it on a short timer instead. Once we have the sale, correcting Amazon takes a second or two. The other direction is much quicker: Amazon tells us straight away. If either shop has an outage, we hold the update and retry until it goes through.
Can I sync inventory between eBay and Amazon?
Yes. Neither marketplace reads the other’s catalogue, so it takes a tool in the middle. QuickSync matches items by SKU and holds one count across both, so an eBay sale lowers what Amazon shows. Design SKUs to 20 characters or fewer, because that is Amazon’s limit and the tighter of the two.
Can Amazon fulfil my eBay orders?
No. Both eBay and Amazon are marketplaces, and neither can be told to fulfil an order that came from the other. That is their constraint rather than something we are missing. What we handle is the stock count and the orders themselves, which arrive in QuickSync from both sides.
Do I have to re-list my eBay products on Amazon?
No. We match your existing eBay and Amazon listings by SKU first, then by title, and hand you a short list of whatever we could not match. You can also copy a listing from one side to the other if you want it in both places; that step always waits for you.
Can I charge a different price on Amazon?
Yes. Set a rule once for Amazon: a percentage, a fixed uplift, or a price you type yourself. We apply it whenever the price changes, and nothing forces eBay and Amazon to the same number.
Does the tracking number go back to both shops?
Not to Amazon. Amazon has no way for us to send a tracking number back.
Can I create an order on Amazon from a sale on eBay?
No. eBay and Amazon hand orders out and do not accept orders created elsewhere. We pull both into one packing list so you still work from one place; each order stays on the channel it came from.
What happens if a buyer cancels or I refund them on eBay or Amazon?
The stock goes back. A cancellation or a refund puts the item back into your count and we send the corrected number to both eBay and Amazon.
Which plan do I need for eBay and Amazon?
Lite covers eBay and Amazon. Lite is $19 a month for two shops and holds 1,000 items, with up to eight connected integrations. You would move up a plan for catalogue size, and your bill goes up by another $19 if you connect a third shop.
Guides for running eBay and Amazon together
Setup walkthroughs, edge cases and comparisons that go deeper than this page: each one is a sub-question, not another page chasing the same head term.
Selling somewhere else as well?
Each combination has its own page, including the limits that apply to that pair, not a generic eBay write-up with the logo swapped.
Or read about one shop on its own
Every channel has a page covering exactly what syncs, what does not, and how fast.
Connect eBay and Amazon and watch one correct the other
Make one test sale and watch the other shop’s count drop. If it doesn’t work the way this page describes, you’ve spent ten minutes and no money.
No credit card required
Setup guides for this pair
Connect each shop with its own walkthrough, then come back to this page for how eBay and Amazon stay in step.