Contact & Seller Support
Spotted a recent marketplace fee revision? Have an idea for a new calculator or reverse margin feature? Send us a note below.
Direct Email
Prefer standard email? Reach our technical and fee research team directly:
Reporting a Fee Rate Change?
Marketplaces update schedules frequently. To help us verify and update the calculators quickly, please include:
- 1.The marketplace name & country region (e.g. eBay UK, Amazon US)
- 2.The category or fee rule changed (e.g. new $0.40 order fee)
- 3.An official policy link or announcement date
Send Us a Message
Fill out the details below and our team will get back to you promptly.
Thank You! Message Received
We've received your feedback. Our research team reviews all fee submissions and suggestions carefully. If a reply is requested, we'll respond to your email.
Frequently Asked Questions
Quick answers to common questions about our platform.
How quickly do you update fees when platforms change rates?
We monitor official seller portal announcements weekly. When an update is announced, our formulas are tested and deployed within 24–48 hours of effective dates.
Can you add a custom calculator for my region's marketplace?
Yes! Send us the marketplace details and link to its published fee schedule. We regularly expand our regional platform coverage based on seller demand.
Is eComFees really 100% free to use?
Yes. All core calculation tools, reverse margin solvers, and category directories are free with no subscription tiers or paywalls.
Do you store my pricing inputs or inventory costs?
No. All math runs strictly inside your local web browser. We never log or send your item pricing, sales figures, or margins to remote servers.