Marter Feature

Walmart Seller Chrome Extension

Marter's Chrome extension puts profit, fees, sales estimates, price history, and seller data directly on the Walmart product page — before you buy.

Add Marter to Chrome — Free See pricing — $24/mo

Quick Answer

Marter is a Walmart seller Chrome extension. Install it, open any Walmart product page, and it overlays the numbers Walmart Seller Center never shows you: net profit after fees, estimated monthly sales, price and offer history, how many sellers share the listing, stock levels, and whether the item is gated for your account. It costs $24/month on a single plan with every feature included.

Sourcing decisions happen on the product page, not in a spreadsheet. Every tab you open to check a fee table, a competitor count, or a price chart is a tab you eventually stop opening — and that's how bad buys get made. Marter's extension collapses that whole research loop into one panel that loads with the listing.

Profit and fees, calculated live

Referral fee, fulfillment cost, and your cost of goods resolved into a real net margin — on the listing, not after the fact.

Sales estimations

Estimated monthly units for the listing, so you can size demand before committing capital to inventory.

Price and offer history

See how the price and the number of competing offers have moved over time, not just today's snapshot.

Seller and stock visibility

Who else is on the listing, how deep their stock runs, and whether Walmart itself is competing with you.

Gating checks

Know whether a product is restricted or gated for your account before you spend money on units you can't list.

Alerts

Get told when price, offer count, or Buy Box status changes on the listings you care about.

Why a browser extension beats a dashboard

Walmart Seller Center tells you what already happened to your own listings. It does not tell you whether the product you're looking at right now is worth sourcing. Dashboards have the same problem: they're a destination you have to remember to visit, and sourcing research is a decision you make dozens of times an hour with a product page already open.

An extension inverts that. The data arrives where the decision is made. That's the entire design premise of Marter — and the reason Amazon sellers who moved to Walmart keep asking for a Keepa-style overlay rather than another analytics portal.

What Marter shows that Walmart Seller Center doesn't

Seller Center is an operations console: orders, listings, performance on items you already sell. Marter is a sourcing console: it answers "should I buy this?" for items you don't sell yet. Net profit after fees, demand estimates, competitive depth on the listing, price history, and gating status are all pre-purchase questions, and none of them are answered in Seller Center.

The extension has a mobile twin

Retail arbitrage doesn't happen at a desk. Marter's mobile app runs the same analysis from a barcode scan, so a clearance endcap gets the same profit, demand, and gating check the product page gets. Same account, same $24/month plan — the mobile app is not an upsell.

How it works

Install Marter from the Chrome Web Store — it's free to add and free to try.

Open any Walmart.com product page, or scan a barcode in the Marter mobile app while you're sourcing in-store.

The Marter panel loads inline with the listing: profit, fees, sales estimate, history, sellers, stock, gating.

Enter your cost of goods to get true net margin, then buy, skip, or set an alert.

Frequently Asked Questions

Is there a Chrome extension for Walmart sellers?

Yes. Marter is a Chrome extension built specifically for Walmart Marketplace sellers. It overlays profit and fee math, sales estimations, price and offer history, seller and stock data, and gating checks on any Walmart product page. It's free to install and $24/month for full access.

Does Keepa work on Walmart?

No. Keepa is an Amazon-only extension and does not track Walmart listings. Walmart sellers who want a Keepa-style overlay for Walmart use Marter for the full sourcing workflow, paired with Histomart for dedicated price-history charting.

How much does the Marter extension cost?

Marter is $24 per month on a single plan that includes every feature — extension, mobile app, alerts, and historical data. There are no tiers and no per-feature upsells. Installing the extension and trying it is free.

What data does the Marter extension show on a Walmart product page?

Net profit after Walmart fees, estimated monthly sales, price history, offer-count history, the sellers sharing the listing, stock levels, and whether the item is gated or restricted for your account.

Does Marter work for retail arbitrage in-store?

Yes. The Marter mobile app runs the same analysis from a barcode scan, so you can check profit, demand, and gating on a clearance shelf without a laptop. It's included in the same $24/month plan.

Put the numbers on the product page

Install the Marter Chrome extension free, then open any Walmart listing. Full access is $24/month — one plan, everything included.

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More Marter features

Walmart Price Tracker Walmart Product Research Tool