Inventory, pricing, and orders in sync across Amazon, Shopify & eBay.
Set one channel as your master for stock and another for price. A sale on any channel updates the rest within minutes — so you stop overselling and stop editing the same listing in three places.
One source of truth for every listing
Link the same product across channels, then choose which channel wins for inventory and which wins for price. ChannelSync Master keeps stock and pricing aligned everywhere and flags anything that drifts out of line.
- Per-product master channel for stock and for price
- Stock and price held in lockstep across channels
- Push an existing product to a new channel in one click
The essentials for selling in three places at once
No warehouse-suite bloat. Just the pieces that keep Amazon, Shopify, and eBay from drifting apart.
Automatic sync
Pick a master channel for stock and one for price. A sale anywhere updates the others within minutes — on a 30-minute schedule, and instantly on Shopify and eBay sale webhooks.
Unified orders
Every order from Amazon, Shopify, and eBay lands in one feed. Stop logging into three seller portals to see what sold today.
One-click cross-listing
Push an existing product to another channel with its images, description, and price carried over — no re-keying the same listing.
Built for independent sellers
Powerful where it counts, without the price tag or setup overhead of enterprise warehouse tools.
Oversell protection
When the last unit sells on one channel, quantities drop on the others before another customer can buy it.
One master rule per product
Decide which channel wins for inventory and which wins for price — per product. No more conflicting numbers across portals.
Alerts when something drifts
Get notified when stock or price changes somewhere unexpected, or when a channel's API throws an error.
Set up in minutes
Connect with OAuth — no API keys to paste. Import your catalog and you're running. No onboarding calls or consultants.
Common questions
See the step-by-step workflow or the full feature list.
How does multi-channel inventory sync work?
You pick one channel as the master for inventory and one as the master for pricing. ChannelSync Master polls each channel every 30 minutes (and reacts to webhooks from Shopify and eBay), then pushes updates to the other channels so stock levels and prices stay aligned.
Does it support Amazon, Shopify, and eBay together?
Yes. You can connect any combination of Amazon, Shopify, and eBay — you don't need all three to start. Products are matched across the connected channels and synced based on the rules you set.
How often does inventory sync between channels?
Auto-sync runs every 30 minutes around the clock. Sales on Shopify or eBay also trigger an immediate webhook-driven decrement, then propagate to the other channels so you don't oversell between cycles.
Can I push a Shopify product to eBay (or vice versa)?
Yes. ChannelSync Master can create a new eBay listing from a Shopify product (and the reverse), carrying over images, descriptions, and pricing. eBay listings are auto-categorized using eBay's Taxonomy API so the required item specifics come pre-filled.
Will it prevent overselling on Amazon when something sells on eBay?
Yes — that's the core use case. When an eBay sale fires its webhook, ChannelSync Master decrements the master inventory record and pushes the new stock level to Amazon and Shopify in the same cycle. You stop the double-sell scenario that triggers Amazon order defects.
How does product matching work when SKUs don't line up?
The matching engine compares product identifiers — titles, brand names, model numbers, and UPC/EAN/MPN codes — then returns a confidence score and a plain-language reason for each suggested match. You approve, reject, or manually link products yourself, so nothing syncs without your sign-off.
Is there a free trial or free tier?
ChannelSync Master is currently in closed beta and beta participants get the full platform at no charge today. After public launch, beta members keep founding-member pricing locked in. Request access from the beta page.
Is it built for small sellers or enterprises?
It's built for independent and small multi-channel sellers — the kind who don't need an implementation consultant or a six-figure platform fee. Connect your accounts, match your products, and you're running in minutes, not months.
What happens if a channel's API goes down?
ChannelSync Master tracks per-channel sync status. If Amazon's SP-API or eBay's Trading API throws errors, the dashboard surfaces it with the error code and the sync retries on the next 30-minute cycle. Other channels keep syncing normally.
Is ChannelSync Master built for independent multi-channel sellers?
Yes. It's built for independent sellers running Amazon, Shopify, and eBay together — not mid-market enterprises. There's no implementation consultant, no onboarding call, and no per-channel setup fee. Connect your accounts with OAuth, review the suggested product matches, set a master channel per product, and you're syncing in minutes. Built-in matching handles SKUs that don't line up across channels.
Currently in closed beta.
We're onboarding a small group of Amazon + Shopify + eBay sellers before public launch. Request access and we'll be in touch.