Know what your
inventory is worth.
Every time.
ResellerOS retrieves live marketplace data via official APIs, applies platform-specific fees, and shows you exactly what you'll net after selling — so you price competitively and never leave money on the table.
What is ResellerOS?
ResellerOS is market intelligence built for resellers. It tells you exactly what any product is worth before you commit to buying it.
Search any product
Enter a product name, UPC, or ASIN. ResellerOS queries eBay and Walmart simultaneously via official APIs and returns live listings in seconds.
See your real margin
Every result shows estimated sell price, platform fees, shipping costs, and net profit — calculated automatically so you never have to open a spreadsheet.
Source with confidence
ROI and profit figures are derived from real active listings, not guesses. Know before you buy whether a deal is worth flipping.
How it works
From market check to confident pricing decision in under 90 seconds.
Query the market
Enter a keyword, UPC, ASIN, or model number. ResellerOS queries official marketplace APIs and returns live pricing data in seconds.
Analyse your profit signal
Sort by estimated net profit or ROI. Platform fees, shipping costs, and your sourcing cost are factored in live — giving you the real net proceeds, not the headline price.
Track & act on winners
Save high-value listings to your watchlist. Recheck live API data at any time and see exactly how margins have shifted — so you act before the window closes.
Everything a reseller actually needs
Not a marketplace. Not just a listing tool. A market intelligence platform built to help resellers price smarter and sell with confidence.
Multi-Channel Market Intelligence
Enter a product name, UPC, or ASIN to see live pricing data across your selling channels — fee-adjusted net proceeds calculated instantly so you know exactly what you'll make.
Real Net Profit — Not Sticker Price
Every result shows platform fees, shipping costs, and estimated net margin — colour-coded so profitable opportunities stand out at a glance.
Watchlist & Price Monitoring
Save high-margin candidates and track price movements over time. One click to recheck live API data and see exactly how your margin has shifted.
Pricing Decisions in Under 30 Seconds
Built for speed at the shelf or the screen. API queries run in parallel so you get a full market picture fast — no manual lookups, no spreadsheets.
Official APIs — No Scraping, Ever
ResellerOS connects exclusively via eBay Browse API and Walmart Open API. No scraping, no unauthorised data collection. Every insight is derived from data you're authorised to access.
Cost & True Margin Calculator
Enter what you paid for an item and every net proceeds figure across all channels updates live — so you know your real margin before you list it for sale.
Proof from early operator workflows
Real feedback from resellers who swapped their multi-tab setup for the hub.
“I can validate a product idea in under a minute now. Stopped opening 4 tabs at once.”
“The net and ROI view makes it easier to skip weak listings quickly. Way fewer bad buys.”
“My VA team moves faster because everything is in one consistent layout. Less context-switching.”
Built for where reselling is going
We're building the operating system for modern resellers — one phase at a time.
- Multi-market unified search
One search. eBay + Walmart results side-by-side instantly.
- Fee-adjusted ROI calculator
Platform fees, shipping & your cost calculated live.
- Market price analysis
Automatically surfaces competitive pricing gaps across platforms.
- Watchlist & price tracking
Save items and see price changes when you return.
- Sell-through rate estimation
Predict how fast an item will sell on each platform.
- Inventory tracking
Track your items from acquisition to final sale.
- Historical price trends
See 30-day price history to set competitive listing prices.
- Amazon integration
Full Amazon FBA/FBM fee calculations and live prices.
- Auto-repricing
Automatically adjust your listing prices to stay competitive.
- One-click relisting
Relist items across multiple platforms with a single click.
- Bulk arbitrage scanner
Scan entire categories for hidden arbitrage opportunities.
- P&L dashboard
Full profit & loss tracking across all your platforms.
Marketplace coverage
Current support and planned expansion. Coverage depends on official API availability.
Browse API · Fee-adjusted profit · All conditions
Open API · Real-time prices · New + Refurb
FBA/FBM fees · ASIN search · In progress
We only add platforms when an official API is available — no scraping, no ToS violations.
Frequently asked questions
Everything you need to know before you start.