Free plan. no credit card required

One inventory.
Amazon and eBay, always in sync.

You sold the last unit on Amazon. eBay still shows it as available. Now you’re canceling an order and risking a defect. Commerce Kitty syncs both marketplaces the moment a sale happens.

Sync Amazon & eBay Free
Also syncs with Amazon eBay Shopify Etsy WooCommerce BigCommerce
The Hidden Cost

Selling on two marketplaces without sync is expensive.

Each miscount ripples through your seller account, your ratings, and your revenue.

1%
Amazon cancellation rate
before account health warnings
2%
eBay defect rate threshold
before selling restrictions kick in
45 min
Average daily time wasted
manually syncing two marketplaces
72%
Of buyers who won’t return
after a canceled order
A Familiar Story

What happens when Amazon and eBay stock gets out of sync

10:03 AM. Item sells on Amazon

Your last unit of a high-demand product. Amazon marks it sold. Your eBay listing still shows 1 available.

10:41 AM. Same item sells on eBay

A second buyer purchases it. You don’t see the eBay order until you log in after lunch.

1:15 PM. Cancel and refund

You cancel the eBay order, process the refund, and send an apology message. Another 20 minutes gone.

Next morning. Defect on your account

eBay logs a seller-initiated cancellation. Your defect rate climbs. Search visibility drops. Future sales suffer.

With Commerce Kitty

10:03 AM. Item sells on Amazon

Commerce Kitty instantly sets eBay stock to zero. Both marketplaces reflect the truth within seconds.

10:03 AM. No double-sale possible

eBay shows the item as out of stock. No second order. No cancellation. No defect. No angry buyer.

Before & After

Two marketplaces, zero headaches

✗ Without Commerce Kitty

  • Logging into Amazon and eBay separately to update stock
  • Inevitable miscount when sales overlap during busy periods
  • Canceled orders eat into your defect rate on both platforms
  • Wasted hours every week on manual inventory reconciliation
  • Fear of high-volume days when mismatches are most likely
  • No single view of what you actually have available

✓ With Commerce Kitty

  • One sale on either platform updates the other instantly
  • Zero oversells. stock stays accurate across both marketplaces
  • Defect rates stay clean, account health stays green
  • Hours saved every week, back to sourcing and selling
  • Scale confidently. sync handles high-volume days automatically
  • Single dashboard showing real stock across Amazon and eBay

Real-time inventory sync across every channel

Connect your sales channels in minutes. Commerce Kitty keeps your stock accurate everywhere you sell. Free plan available.

Start Syncing Free
How It Works

Connected in minutes, synced forever

No developer. No spreadsheets. No manual updates. Just connect and go.

1

Connect Amazon & eBay

Authorize both marketplaces with a few clicks. Commerce Kitty uses official APIs. no passwords shared.

2

Match your listings

Commerce Kitty finds your matching products across both platforms using SKU, EAN, or UPC. Review and confirm.

3

Sell on both, worry about neither

Every sale on either marketplace instantly updates the other. Automatic, real-time, accurate.

Get Started Free

I was selling the same items on Amazon and eBay and constantly overselling because I couldn’t update fast enough. Commerce Kitty fixed that the first day I signed up. I haven’t had a single cancellation since.

Marcus T.. Amazon & eBay seller, electronics and collectibles
FAQ

Amazon + eBay sync questions

Does Commerce Kitty work with FBA inventory?
Yes. Commerce Kitty syncs with both FBA (Fulfilled by Amazon) and FBM (Fulfilled by Merchant) inventory. FBA stock levels are pulled directly from Amazon and used to update your eBay listings in real-time.
How fast does the sync happen between Amazon and eBay?
Within seconds. When a sale is recorded on either platform, Commerce Kitty triggers an immediate update on the other. There is no batch processing or scheduled delay.
What if I sell in multiple Amazon marketplaces (US, UK, CA)?
Commerce Kitty supports multiple Amazon marketplace accounts. You can connect your US, UK, and CA stores separately and map products to the appropriate eBay listings in each region.
Can it handle products with variations (size, color, etc.)?
Yes. Variations are matched by SKU or barcode. A sale of “Size M, Blue” on Amazon will only decrement that specific variant on eBay, leaving other sizes and colors unaffected.
Do I need to keep using spreadsheets once I connect?
No. Commerce Kitty becomes your single source of truth for stock levels. You can set inventory in one place and it propagates to both Amazon and eBay automatically. The spreadsheet era is over.

Stop juggling two marketplaces manually

Every minute your stock is out of sync is another chance to oversell. Fix it permanently. free account, no credit card.

Sync Amazon & eBay Free
Free plan included No credit card required Set up in 5 minutes

Ready to sync your inventory?

Connect your sales channels in minutes. Real-time sync across Shopify, Etsy, Amazon, eBay, and more. Free plan available, no credit card required.

Start Syncing Free
Free plan included No credit card required Set up in 5 minutes