Uploading inventory to Ebay and Amazon

Good day.
1. In what format are the data currently (CSV/XML/API, is there a breakdown by variations)?
2. Is there already categorization and attributes according to eBay/Amazon requirements, or does it need to be mapped?
3. Is synchronization (prices/stock) needed after the upload?
4. What is the deadline?

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Handling a catalog of 1,000,000 items across eBay and Amazon requires a robust, API-driven architecture to ensure data synchronization and bypass platform rate limits. With over 5 years of experience in complex e-commerce development and high-volume catalog migrations, I have built integration engines that manage multi-channel data mapping and automated error reconciliation for large-scale inventories. My approach involves developing a custom middleware layer to normalize your source data and push it via the eBay Large Merchant Services and Amazon SP-API for maximum efficiency. This ensures that item specifics, variations, and pricing stay consistent across both marketplaces without manual intervention. I can complete this integration and the full data push within 45 days for a total project cost of $1400. What is the current format of your source data (e.g., ERP, SQL, or CSV), and do you already have approved developer accounts for the Amazon SP-API?

Hello!
For 10 years, I have specialized in complex projects that require high qualifications.
I have extensive experience with similar projects.
I can professionally perform uploads to eBay and Amazon.
The exact price will be determined after clarifying the technical specifications.
Work plan.
Analysis of requirements and data formats for eBay and Amazon.
Audit and preparation of inventory: cleaning, unification, attribute verification.
Mapping inventory fields to platform requirements.
… Preparation of templates and feeds for bulk upload.
Setting up seller accounts and API access.
Development or configuration of tools for bulk upload.
Step-by-step uploading of products to eBay.
Step-by-step uploading of products to Amazon.
Error handling and rejected items.
Optimization of listings: titles, descriptions, categories, keywords.
Verification of correct product display.
Final testing and validation.

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Good afternoon.
I'm interested in your project. I have extensive experience creating listings, including bulk uploading listings to Amazon inventory in Europe and the US across various niches and categories. As for eBay, I haven't worked with bulk uploads, but I know there are account requirements. For example, File Exchange requires account age and sales activity.
I can provide links to recent projects.
I'm open to discussion.

Hi, I'm Oleksandr. For the past 3 years I have been professionally engaged in uploading products (Data Entry Specialist, E-commerce content-manager) and maintaining online stores and websites on various CMS and marketplaces, including Allegro, Kasta, Rozetka, Prom.
I have worked with such companies as Rabotniki.ua, Zozulia Home Group, Fagola, Tokishop, dumok.ua, Beautiful Shop, Prosto, etc.
If you have 1 million products in total, it'll be hard to estimate the price, but if you mean 200 and 800 items (1k), then it's around $1500 for all of them when uploading every item individually.
If the task implies automatic uploading (when the content is ready), the we can agree personally depending on the exact volume and complexity.

ready to help you out

will share prevoius work in chat to make sure we are match



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Hello, I worked on a project to automate the upload of 150,000 products to marketplaces for an electronics online store, which allowed sales to increase by 40% in 2 months.

Do you plan to use API integration for automatic updates of stock and prices, or do we need to set up a one-time upload via CSV files?

I suggest we get in touch; I will provide you with free technical consultation and we will create a development plan + I will tell you about my team!

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Hi, I'm Igor, Senior Tech Lead and Sales Manager at SDEV. We specialize in building robust technical solutions for complex business tasks, including large-scale data operations and marketplace integrations.

We’ve handled similar projects involving bulk product uploads to Amazon and eBay, with automation pipelines that ensure accuracy, speed, and compliance with platform requirements. For your volume — 200,000 items on eBay and 800,000 on Amazon — we’ll develop a custom, scalable solution using automated scripts with error handling, data normalization, and status tracking.

Our approach includes:
- Parsing and cleaning your inventory data.
- Mapping attributes to Amazon and eBay catalog standards.
- Handling image hosting and formatting.
- Using official APIs with rate limit management.
… - Monitoring upload progress and resolving failed listings.

We work strictly as engineers — no middlemen. All development and DevOps are done in-house.

Let me know the format of your inventory data (CSV, JSON, etc.) and whether you have API access already set up. This will help us finalize the quote.

Looking forward to your reply.