Marketplace integration services for Amazon, eBay, Walmart and every channel you sell on
We connect your catalog, inventory, and orders to Amazon (SP-API), eBay, Walmart Marketplace, Etsy, Temu, Shein, and Shopee — and keep them in sync. Netalith builds, supports, and operates marketplace API integrations for online sellers, brands, and software teams.
- For individuals
- Online sellers
- Businesses
- US · EU · UK · Middle East · Americas
The problem
Selling on more marketplaces shouldn't mean more manual work
Overselling and stock-outs
Inventory updated by hand or by a fragile script leads to overselling, cancelled orders, and account-health warnings.
Orders copied by hand
Every order re-typed into your store, ERP, or shipping tool costs time and invites mistakes — and tracking uploads arrive late.
Listings rejected or suppressed
Each marketplace has its own category, attribute, and image rules. One missing field and the listing never goes live.
APIs that keep changing
Amazon moved from MWS to SP-API, and every marketplace updates its APIs and authorization. Integrations break without someone watching them.
What we do
Marketplace API integration, done end to end
For your own seller accounts or for the software product you sell to other sellers.
Amazon SP-API integration
Listings, pricing, inventory, orders, fulfillment, and reports through the Amazon Selling Partner API — for your seller account or your app.
eBay & Walmart API integration
Listing creation, inventory and price sync, order import, and shipment tracking with the eBay APIs and Walmart Marketplace APIs.
Etsy, Temu, Shein & Shopee
Catalog upload, stock updates, and order sync for Etsy, Temu, Shein, and Shopee through each marketplace's seller or partner APIs.
Multichannel inventory & order sync
One source of truth for stock and orders across marketplaces, your own store, and your ERP or Odoo — with webhooks, queues, and retries.
Listing automation & data mapping
Map your product data to every marketplace's categories and attributes, then publish or update listings in bulk.
Monitoring & operations
Error alerts, sync dashboards, and ongoing support, so problems are fixed before they reach your account health.
Marketplaces & APIs we integrate
- Amazon SP-API
- Amazon Seller Central
- eBay APIs
- Walmart Marketplace API
- Etsy Open API
- Temu
- Shein
- Shopee Open Platform
- Listings
- Inventory sync
- Order import
- Shipment tracking
- Webhooks
- Odoo / ERP
Proof, not promises
Built by engineers who've done it before
Most client work is under NDA — here is what we can share about our marketplace experience.
Multichannel platform experience
Hands-on experience building marketplace API integrations inside a multichannel eCommerce platform — listings, inventory, orders, and fulfillment across channels.
Channel ⇄ ERP sync
Product, inventory, and order syncs between sales channels and ERPs such as Odoo, so your back office stays the source of truth.
Odoo development →Store-side integrations
Marketplaces connected to your own Shopify, WooCommerce, or BigCommerce store — one catalog, every channel.
eCommerce platforms →Looking for something else? See all services.
How it works
From manual uploads to automatic sync
Every request is scoped and quoted before any work starts — no fixed catalog, no surprises.
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1
Share your channels
Tell us which marketplaces you sell on, where your product data lives, and what should stay in sync.
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2
Audit & quote
We check your accounts, API access, and data quality, then send a scope and fixed quote.
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3
Build & test
We build against sandbox environments where the marketplace offers them, then roll out to production in stages.
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4
Go live & monitor
Syncs run on schedule or in real time, with alerts and a team that fixes issues as marketplaces change.
Why Netalith
Why sellers trust us with their marketplace data
Marketplace integrations touch your stock, your orders, and your account health — they need engineering discipline, not a quick script.
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Official, revocable access
We use each marketplace's official authorization flows and API credentials that you grant and can revoke — never your account password.
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Regional know-how
Amazon SP-API has separate North America, Europe, and Far East endpoints, and every marketplace has its own local rules. We build with those differences in mind.
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Tech and selling in one team
We understand listings, account health, and fulfillment, so integrations match how marketplaces actually behave.
Who we work with
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Individuals & creators
Solo sellers who want listings and orders to stop eating their evenings.
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Online sellers
Brands selling on several marketplaces that need inventory in sync.
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Businesses
Retailers and SaaS teams that need production-grade marketplace APIs.
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Clients worldwide
We work remotely in English with clients in the United States, the EU and UK, the Middle East, Canada, and Latin America, and schedule calls in your time zone.
Get a quote
Tell us which marketplaces you sell on
Share your channels and what should stay in sync. We reply with a scope and a fixed price — usually within 24–48 hours.
FAQ
Marketplace integration FAQ
Which marketplaces can you integrate?
Amazon (through the Selling Partner API, SP-API), eBay, Walmart Marketplace, Etsy, Temu, Shein, and Shopee. We can also connect them to your own store — Shopify, BigCommerce, or WooCommerce — and to ERPs such as Odoo.
Do you build Amazon SP-API integrations?
Yes. We build SP-API integrations for listings, pricing, inventory, orders, fulfillment, and reports — either for your own seller account or as part of a software product you offer to other sellers.
Can you sync inventory and orders across several marketplaces?
Yes. We create a single source of truth for stock and orders, push inventory updates to every channel, and pull orders back into your store, ERP, or shipping tool — including tracking uploads.
Do you need my marketplace password?
No. We use each marketplace's official app authorization or API credentials that you grant and can revoke at any time.
Do you work with clients in the US, Europe, and the Middle East?
Yes. Netalith works remotely with individuals, online sellers, and businesses worldwide — including the United States, the EU and UK, the Middle East, Canada, and Latin America. We communicate in English by email, chat, or scheduled calls in your time zone.
How much does a marketplace integration cost?
Every job is quoted on its actual scope — a focused fix costs far less than a full build. Send us your requirements and we'll reply with a scope and a fixed price, usually within 24–48 hours, before any work begins.
More answers on our FAQ page.
Selling on more than one marketplace?
Tell us your channels and what should stay in sync — we'll send back a scope and a fixed quote.