Chrome Extension
Install the SellerMagnet Chrome Extension to research Amazon products, search results, brands, and niches directly on Amazon, with a BUY/PASS verdict, BSR, estimated sales, fees, profit, keywords, and
Difficulty: 🟡 Intermediate · Reading time: ~14 min
📋 Overview
The SellerMagnet Chrome Extension brings your product research onto Amazon itself. Instead of copying an ASIN, switching to the dashboard, pasting it, and waiting, the extension injects live research widgets directly onto the Amazon pages you are already looking at - product pages, search results, brand stores, and seller storefronts. You evaluate a single product or an entire niche without ever leaving the tab.
Here is what that looks like in practice. You open a product on amazon.de. Above the title, a coloured badge tells you BUY, MARGINAL, or PASS - measured against the buying rules you set (your minimum profit, ROI, margin, and maximum BSR). Below it, a compact panel shows the price, the Best Seller Rank, an estimate of how many units sell per month, the fees Amazon will charge, and the profit you would actually keep. On a search-results page, every tile gets its own mini metrics strip, and a banner at the top summarises the whole niche - how saturated it is, the average price, who the top brands are. It is the on-Amazon companion to the SellerMagnet dashboard: most features work with a free sign-in, and a few need a connected Amazon account or a paid plan.
Why research on-page matters. Sourcing decisions are made in bulk - you might look at 200 products in an evening. Every tab-switch and copy-paste costs seconds and breaks your focus. Seeing the verdict and profit inline, as you browse, is what lets you triage a whole category quickly and only slow down for the products that are actually worth it.
The extension does not run inside Seller Central (sellercentral.amazon.* is excluded by design). It works on the public Amazon storefront only - the same pages a shopper sees. If a widget is missing, first check you are on a public product or search page, not Seller Central.
Installation
Installing takes about two minutes. You add it from the Chrome Web Store, pin it so it is always one click away, and sign in with your free SellerMagnet account.
Download from the Chrome Web Store
Open Google Chrome (or a Chromium browser such as Edge or Brave).
Go to the SellerMagnet Chrome Extension page.
Click Add to Chrome, then confirm with Add Extension.
Chrome will ask you to approve the extension's permissions. It needs access to Amazon pages so it can read the ASIN you are viewing and draw its widgets there - it does not read other sites (see the FAQ on browsing privacy).
Pin it to your toolbar
Click the puzzle-piece (Extensions) icon in Chrome's toolbar.
Find SellerMagnet in the list and click the pin icon next to it.
Pinning keeps the SellerMagnet icon visible at all times. That icon is your control centre - you will click it to sign in, switch projects, toggle widgets, and set your buying criteria. Without pinning, it hides behind the puzzle-piece and every action takes an extra click.
Sign in - free
Click the SellerMagnet icon to open the popup.
Click Sign in or sign up - free (No credit card required). If you would rather look around first, click Demo session to explore with sample data.
Once signed in, the popup shows your account, active project, connection status, and your monthly lookup quota.
Signing in is what unlocks the real research data - BSR, monthly sales estimates, and the BUY/PASS verdict. Signed out, you only get the basic numbers Amazon already shows on the page.
Pro tip: If you keep separate Chrome profiles (personal, work), install and sign in on the profile you actually use for sourcing. The extension's session lives in that profile, so your account, project, and settings stay put.
Account and connections
The extension mirrors your SellerMagnet account, so whatever project and plan you have on the web carries over. Beyond simply signing in, you can authorise two optional connections from the popup. Both are secure OAuth handshakes that go through auth.sellermagnet.com - you approve them on Amazon's own consent screen, and SellerMagnet never sees your Amazon password.
Amazon SP-API
Connect Amazon
Replaces estimated fees with your real Amazon fees, exact net profit, VAT, and sell-eligibility
Estimated fees can be 15-20% off. Real fees are the difference between a product that looks profitable and one that actually is.
Amazon Ads (PPC)
Connect Ads
Live keyword search volume and bid ranges
Tells you whether a niche has real demand and how expensive it is to advertise into - before you commit.
Each connection shows a live pill: connected / not connected / checking…. Multi-account sellers can switch the active SP-API connection and the active project straight from the popup, so you always research under the right account and your saved products land in the right project.
Worked example. You sell under two entities - a UK Ltd and a German GmbH. Before checking a product on amazon.de, open the popup and switch the active connection to the GmbH. Now the fees, VAT, and eligibility the extension shows are the ones that entity would actually face on that marketplace, not a generic estimate.
How to connect SP-API and Ads
Both connections are optional, but SP-API is the single biggest upgrade to the accuracy of your numbers. You authorise each one once, from the popup, and it stays connected until you revoke it.
Click Connect Amazon (SP-API)
Connect Amazon opens auth.sellermagnet.com in a new tab and hands you to Amazon's own consent screen. Approve it there. SellerMagnet never sees your Amazon password - it receives only the SP-API authorisation. When you return to the popup, the SP-API pill flips to connected (and, for multi-account sellers, shows how many sellers are linked).
This unlocks real Amazon fees, exact net profit, VAT, FBA prep, and sell-eligibility for your account. Every profit figure that was labelled Estimated now recalculates against your real fee schedule.
Click Connect Ads (PPC) - optional
Connect Ads runs the same OAuth handshake for Amazon Advertising. Once connected, the keyword widgets show live search volume and bid ranges instead of bids-only. If you have SP-API connected but not Ads, the popup shows an "Unlock keyword research" notice with a one-click Connect Amazon Ads link.
Pick the active connection (multi-account only)
If your SP-API login covers more than one seller account, an Active SP-API connection dropdown appears. Choose a specific seller, or All connections (combined), so fees, VAT, and eligibility are computed for the right entity on the marketplace you are viewing.
You can also start either flow from the Options page (Connections card, Open Connections) or from the command palette (Connect Amazon (SP-API) / Connect Amazon Ads (PPC)). They all lead to the same auth.sellermagnet.com consent screen.
The toolbar popup
Clicking the SellerMagnet icon opens the control popup - the single place you configure everything the extension does. It is worth setting this up once, carefully, because the numbers you enter here (especially under Settings) drive every verdict you will see afterwards.
Today at a glance - counters for Products looked at, Searches run, Pro saved items, and your usage streak. A quick pulse on how much research you have done today.
Account - your email, a Dashboard button that opens the web app, a Display language switcher (8 languages), and a Project switcher. Switch projects here to keep research for different stores or clients separate.
Sourcer lookups this month - a quota meter with a progress bar. As you approach your plan's allowance it warns "Approaching plan limit - upgrade" so a big sourcing session never surprises you by running dry.
Connections - the Amazon SP-API and Amazon Ads (PPC) pills, plus the Connect Amazon / Connect Ads buttons described above.
Widgets - toggle which side-panel widgets appear: Quick Info, Profit Calculator, Offers Table, Price History, Monthly Sold, BSR History, Buy Box Share, plus a Chart Timeframe (30 / 90 / 180 days / 1 year). Turn off the ones you do not use so the panel stays focused.
Layout - Density (Comfortable / Compact), Theme (Auto / Light / Dark), and on/off switches for each on-Amazon surface (niche card, tile hover popup, inline tile strips, storefront analyzer, keyword widget, sponsored badges, auto-fetch BSR on results, and more). A red Pause SellerMagnet on Amazon kill-switch turns everything off in one click - handy when you just want to shop. Export my data downloads your saved ideas, competitors, and recently-viewed items as JSON.
Settings - your VAT Rate (%) and your Buying Criteria: Max BSR, Min Profit, Min ROI, Min Margin, Min Sales/mo, FBM Cost. These are the rules the verdict is measured against.
Set your Buying Criteria first, before you research anything. The BUY/PASS verdict is only as meaningful as the thresholds behind it. If you leave them at defaults, "BUY" just means "the defaults passed" - not "this fits my business." Enter your real minimum profit, ROI, margin, and the highest BSR you are willing to touch, and the verdict becomes a genuine filter.
Turn on Auto-fetch BSR for visible results only if you want it - it spends one lookup from your monthly quota per fetched product. On a busy search page that adds up fast, so most sellers leave it off and click Get BSR on the specific tiles they care about.
How to set your Buying Criteria
The Buying Criteria live in the Settings section at the bottom of the popup. They are the rules the BUY/MARGINAL/PASS verdict is measured against, so set them once to match your business before you research anything.
Enter a Cost Price so the verdict can compute
The verdict needs a cost of goods to work out profit, ROI, and margin. Enter your landed cost once in the side panel's Profit Calculator (Cost Price) - the extension remembers it per ASIN. Until a cost is set, the badge reads SET COGS instead of a verdict.
Each Buying Criteria field controls one check in the verdict:
Max BSR
The highest Best Seller Rank you will accept. A lower BSR means the item sells faster; anything above your ceiling fails.
50000
Min Profit
The lowest net profit per unit (in the marketplace currency) you are willing to make.
5.00
Min ROI
The lowest return on investment (profit divided by your cost) you will accept.
30
Min Margin
The lowest profit margin (profit divided by the sale price) you will accept.
20
Min Sales/mo
The lowest estimated monthly unit sales the product must show, so you skip dead listings.
10
FBM Cost
Your own per-unit fulfilment cost when you ship yourself (FBM). It feeds the Profit Calculator so FBM profit is realistic.
3.00
If you leave the Buying Criteria blank, the verdict falls back to sensible defaults (Max BSR 50000, Min Profit 5, Min ROI 30, Min Margin 20, Min Sales 10) and adds "(defaults - tune in Settings)" to its rationale, so you always know whether a verdict is judging against your rules or the built-in ones.
How the verdict is computed. Once a Cost Price is set, each criterion you filled in becomes a check, and each check lands in one of three states:
Pass - the metric clears your threshold.
Near-miss (soft fail) - the metric is close but under: BSR within 20% above your Max BSR, or Profit / ROI / Margin / Sales within about 85% of your minimum.
Hard fail - the metric misses by more than that.
The overall verdict then follows:
BUY
Every check passes.
MARGINAL
No hard fails, but at least one near-miss.
PASS
At least one hard fail.
Because the checks use your numbers, the same product can read BUY for a seller who accepts 20% ROI and PASS for one who demands 40%.
How to set your VAT Rate
Still in Settings, the VAT Rate (%) field sits above the Buying Criteria. Enter the standard VAT rate for the marketplace you sell on (for example 19 for Germany, 20 for the UK, 0 if you are not VAT-registered). The rate is deducted in every profit figure and shown as VAT Due in the Profit Calculator, so profit is never overstated.
If your SellerMagnet account already has a firm VAT percentage on file, the extension syncs that value into this field automatically - you only need to set it manually if you want to override it.
How to configure the side-panel widgets
The Widgets section decides which cards appear inside the on-page side panel. Flip each switch on or off; the panel updates on the next page load, so you can strip it down to only the cards you actually read.
Quick Info
The headline metric block (price, BSR, sales, profit).
Profit Calculator
The interactive FBA/FBM cost-to-profit calculator.
Offers Table
Competing sellers and their prices.
Price History
The price chart over time.
Monthly Sold
The estimated-units-sold chart.
BSR History
The Best Seller Rank chart.
BuyBox Share
The Buy Box ownership chart.
Below the switches, Chart Timeframe sets the window for every history chart - 30 Days / 90 Days / 180 Days / 1 Year (the default is 180 Days). Pick a shorter window to spot recent moves, or 1 Year to judge seasonality.
How to configure the Layout
The Layout section controls the extension's appearance and every surface it draws directly onto Amazon. Two dropdowns set the look:
Density - Comfortable (default) or Compact to fit more on screen.
Theme - Auto (match Amazon) (default), Light, or Dark.
The switches below turn each on-Amazon surface on or off. Turn off anything you do not use so Amazon stays uncluttered:
Niche overview card (browse pages)
On
The niche summary banner above search results.
Search-bar augmentation (toolbar)
On
The extras added next to Amazon's search box.
Keyword volume widget (search bar)
On
The monthly-searches widget by the search bar.
Tile SM Pulse hover popup
On
The quick-preview popover when you hover a result tile.
Inline tile SM Pulse strips
On
The metric strips drawn under each result tile.
Storefront Analyzer (seller pages)
On
The seller-storefront deep dive.
SM Pulse + Keywords widget
On
The SM Pulse block and keyword table on product pages.
Auto-fetch BSR for visible SERP tiles (uses quota)
Off
Whether BSR is fetched automatically for every visible tile. Spends a lookup per product.
Sponsored-listing badges
On
The Sponsored / Prime / Coupon / Choice badges on tiles.
Search tile SM Pulse strips (sponsored / Prime / coupon)
On
The per-tile SM Pulse overlays on search results.
Reduce motion (animations)
Off
Suppresses the extension's animations.
Pause SellerMagnet on Amazon
Off
The red kill-switch. Turns every on-Amazon surface off in one click.
Three buttons sit at the bottom of the Layout section:
Reset layout to defaults - restores every toggle, density, and theme to its default value.
Export my data - downloads your saved ideas, tracked competitors, saved keywords, and recently-viewed ASINs as a single JSON file.
Shortcuts ⌘/ - opens the keyboard-shortcut cheat sheet (on an Amazon tab).
On an Amazon product page
This is where you will spend most of your time. Open any product on a supported Amazon marketplace and the extension layers three things onto the page: a one-glance verdict, a compact SM Pulse metric strip, and a fuller side panel you open when you want the detail.
The verdict
Directly above the product title, the extension shows a single word that answers "should I even look closer?" - judged against the Buying Criteria you set in the popup:
BUY
Every one of your criteria passes
Worth a proper look - open the side panel and check the numbers
MARGINAL
Borderline on one or more metrics
Investigate - it may work with a better supplier price or lower FBM cost
PASS
Hard-fails at least one criterion
Move on, unless you have a specific angle
SET COGS
No cost of goods entered yet
Open the Profit Calculator and enter your Cost Price - profit, ROI, and margin cannot be computed without it
NO DATA
Not enough information yet
Usually means: sign in, or click to fetch BSR
Because the verdict uses your thresholds, the same product can read BUY for a seller who accepts 20% ROI and PASS for one who demands 40%. That is the point - it filters to your business, not a generic benchmark.
SM Pulse
Just below, the SM Pulse widget shows the headline metrics as tiles: Price, Rating and review count, BSR, Est. profit (calculated at roughly 30% fees until you connect SP-API, after which it becomes Profit (real fees)), number of Images, and Listing age. When you are signed out, the gated tiles (BSR, monthly sales, listing age) invite you to "Sign in to unlock - free account."
A row of action buttons sits with it:
Save ASIN - stores the product to your project so you can review it later in the dashboard Watchlist.
Compare - pins this ASIN to the Compare tray (up to 4 products side by side).
Copy ASIN - copies the identifier to your clipboard.
Open in dashboard - jumps to the full product view on the web app.
Find on Alibaba - opens a supplier search for the product, to start costing a source.
There is also a Top keywords mini-table (Keyword / Vol per month / Bid range / Match) with a View all link that opens the full keyword modal, where you can export to CSV.
The side panel
When a tile is not enough, open the side panel - a fuller research surface with tabs Sourcer / History / Keywords / Settings:
Sourcer tab - Quick Information, Product Details, Categories, Offers, and the full metric set: Buy Box price, Amazon's price, Lowest FBA/FBM price, Estimated Sales, Total Stock, Best Seller Rank, Variations, Buy Box Share, Private Label, Eligible, Total Reviews, Review Average.
Profit Calculator - set Fulfillment (FBA/FBM), your FBM cost, and VAT, and it returns Maximum Cost, Total Fees, VAT Due, Estimated Profit, Profit Margin, Breakeven Price, Est. Payout, and ROI. This is the tool you use to answer "what is the most I can pay a supplier and still hit my margin?"
History tab - Price, BSR, Monthly Sold, and Buy Box Share charts over 30 / 90 / 180 / 365 days, so you can tell a steady seller from a one-off spike.
Offers / Buy Box share - tables of the competing sellers, their average price, the share of the Buy Box each won, and when they last won it.
How to open it: click Open SellerMagnet on the SM Pulse block, press the Toggle Panel button in the popup, or run Open Sourcer panel from the command palette (Ctrl / ⌘ + K). You can place the panel where it suits you - anchored under the buy box, docked left or right, or floating - and resize it from a mini strip to the full view. To set the default placement, use Options > Widget positions > PDP Pulse (Top of page / Sidebar / Bottom of page / Floating panel).
Worked example - can I afford this product? You are looking at a kitchen gadget selling for €24.99. Open the side panel, go to the Profit Calculator, set FBA, enter your 19% German VAT, and read Maximum Cost. Say it shows €6.10 at your target 35% margin. Now you know your supplier ceiling: anything above €6.10 landed cost and this product fails your rule. You have your answer in seconds, before you ever message a supplier.
Always know which fees you are seeing. The panel labels every profit figure as Real fees (your SP-API), Standard fees (public), or Estimated fees. Estimates can differ from Amazon's real charges by roughly 15-20%, which is easily the whole margin on a thin product. Connect SP-API before you commit real money.
On Amazon search results (SERP)
Search results are where the extension shines for niche research - judging a whole category at once instead of one product at a time.
Niche summary banner sits above the results and characterises the entire page: ASIN count, sponsored count, average price, average rating, median reviews (a high median means an entrenched, saturated niche; a low one hints at opportunity), average BSR, search volume per month, an opportunity score, the sponsored-vs-organic split, the price range, and the top brands competing. Buttons let you Grab (open the Niche Mapper), Copy the ASIN list, or open the dashboard.
Per-tile SM Pulse strips appear on each result: price, rating, reviews, BSR/Sales, an estimated profit, and badges (Sponsored / Prime / Coupon / Choice / #1 Bestseller), each with a Get BSR button so you fetch data only for the tiles worth it.
Tile hover popover - hovering a result gives a quick preview with Get full details / Open in SellerMagnet panel.
Niche Mapper - a filterable, sortable table of the top ASINs on the page (All / Organic / Sponsored), with Copy ASINs, Copy CSV, and Download CSV so you can pull the whole niche into a spreadsheet.
Search-bar keyword widget (Beta) - next to Amazon's search box, showing monthly searches, competing products, estimated revenue per month, and top brands, with Save keyword and Open Keyword Research.
Worked example - read a niche in 30 seconds. Search "bamboo cutlery set" on amazon.co.uk. The banner shows an average price of £12, a median review count of 40, and a sponsored split of 8 of 20 tiles. Low median reviews plus a manageable sponsored share suggests a niche you could still enter. Click Grab to open the Niche Mapper, Download CSV, and you have the top 20 competitors and their metrics ready for a deeper look - all without opening a single product.
How to configure the SERP surfaces. Every surface above has its own switch in the popup's Layout section - Niche overview card, Inline tile SM Pulse strips, Tile SM Pulse hover popup, Search tile SM Pulse strips, Sponsored-listing badges, and Keyword volume widget. Turn off any you do not want. The niche banner is cached so revisiting a search does not re-spend lookups; set how long it is kept in Options > Data & Refresh > Niche overview cache (1 hour / 6 hours / 24 hours / 72 hours).
Keyword tools
A Keywords widget and table listing keywords with search volume, bid range, and match type, exportable to CSV.
How to open and configure: the keyword table lives in the side panel's Keywords tab and in the SM Pulse + Keywords widget on the product page (toggle it under Layout). The search-bar keyword widget has its own Keyword volume widget (search bar) switch. Full live volume needs a connected Amazon Ads account - see How to connect SP-API and Ads; when Amazon returns bids but not volume, the widget says so plainly rather than showing a blank.
Brand Lens
On brand-store and search-by-brand pages, a card that aggregates the brand's visible catalogue: product count, estimated 30-day revenue, average price and rating, BSR distribution, and the top 5 products by estimated revenue. Use it to size up a competitor's whole operation at a glance.
How to open: navigate to any Amazon brand store or a search filtered by brand and the Brand Lens card appears automatically. Export brand is available on a paid plan.
Compare
Pin up to 4 ASINs across different pages and view them side by side on price, BSR, rating, and reviews, with copy-as-CSV. Ideal for choosing between a few finalists.
How to use: on any product, click Compare in the SM Pulse action row to pin the ASIN to the tray. Open the Compare tray with Ctrl / ⌘ + Shift + C, or from the command palette. Pinned ASINs persist as you browse to other products.
Command palette
Press Ctrl / ⌘ + K for a fuzzy command bar - the fastest way to drive the extension once you know it. Start typing a command, an ASIN, or a marketplace name.
Shortcuts:
Ctrl / ⌘ + K
The command palette
Ctrl / ⌘ + /
The keyboard-shortcut cheat sheet
Ctrl / ⌘ + Shift + C
The Compare tray
Commands are grouped into Navigation, Tools, Layout, Marketplaces, Account, and Recent, and include: Open Sourcer panel, Open History, Open Keywords / PPC tab, Open Settings, Open Sales Estimator, Copy ASIN, Open this ASIN in SellerMagnet dashboard, Refresh data for this ASIN, Refresh tile overlays, theme and density switches, Connect Amazon (SP-API) / Connect Amazon Ads (PPC), and Open on another marketplace.
Most commands act on a product or search page. On other pages the palette shows a reminder to open a product page for SM Pulse, a search for the Niche Banner, or a brand store for Brand Lens.
Settings (options page)
Beyond the popup, the extension has a full Options page (opens in its own tab) for the settings you set once and forget.
How to open it: right-click the SellerMagnet icon and choose Options, or open chrome://extensions, find SellerMagnet, and click Details > Extension options. Every change here saves instantly - a small Saved flash confirms it - and applies across all your open Amazon tabs.
Display
Theme
System (default), Light, Dark
Sets the extension's colour scheme independently of Amazon. System follows your OS setting.
Display currency
Native (per marketplace) (default), or a fixed currency (USD, EUR, GBP, JPY, and more)
Native shows each marketplace's own currency. Pick a fixed currency to convert every price into it, so prices from amazon.de and amazon.co.uk line up in one unit for cross-market comparison.
Language
English, Deutsch, Français, Italiano, Español, Português, Svenska, Polski
The interface language. Mirrors the popup's language switcher.
Reduce motion
On / Off (default Off)
Suppresses the extension's animations. Handy on slower machines or if motion distracts you.
Notifications
Show toasts on save / copy
On
Small confirmation toasts when you save an ASIN or copy something. Turn off for a silent workflow.
Desktop notifications for tracked-competitor price drops
Off
Sends an OS-level notification when a competitor you track lowers their price.
Data & Refresh
BSR auto-fetch on SERP tiles
On / Off (default Off)
The same auto-fetch control as the popup's Layout switch. Leave off to avoid spending a lookup on every visible tile.
Niche overview cache
1 hour / 6 hours / 24 hours (default) / 72 hours
How long a niche banner's data is reused before it is re-fetched. A longer cache saves lookups on niches you revisit; a shorter one keeps data fresher.
Widget positions
Set the default on-page placement for the three main surfaces. You can still drag or re-dock them per page; this is the starting position.
PDP Pulse
Top of page / Sidebar / Bottom of page / Floating panel
Sidebar
Product Summary
Top of page / Sidebar / Bottom of page / Floating panel
Top of page
Search Banner
Top of page / Bottom of page / Floating panel
Top of page
Connections
Open Connections launches the same auth.sellermagnet.com flow as the popup's Connect buttons, where you authorise or revoke SP-API (real fees, FBA prep, exact net profit) and Ads (live keyword volume and bid ranges). See How to connect SP-API and Ads.
About
Shows the installed version and links to Help & Documentation, Pricing, and Privacy. Reset clears every extension setting back to its default (it asks you to confirm first, since it cannot be undone) - use it for a clean slate if your configuration ever gets tangled.
Supported marketplaces and languages
The extension runs on 22 Amazon marketplaces:
North America
amazon.com, amazon.ca, amazon.com.mx
South America
amazon.com.br
Europe
amazon.co.uk, amazon.de, amazon.fr, amazon.it, amazon.es, amazon.nl, amazon.pl, amazon.se, amazon.com.be, amazon.ie
Asia-Pacific
amazon.co.jp, amazon.com.au, amazon.sg, amazon.in
Middle East / Africa
amazon.ae, amazon.sa, amazon.eg, amazon.com.tr
The interface itself is available in 8 languages: English, German, Spanish, French, Italian, Polish, Portuguese, and Swedish (selectable in both the popup and the options page).
Some niche metrics depend on how deeply a marketplace is covered. Where a market is not covered, the extension tells you honestly - "Niche metrics not available on this marketplace." - instead of showing partial or misleading data.
What needs login, a connection, or a plan
The extension is deliberately layered so you can start free and only pay when you need the deeper data. Here is exactly what each tier gives you:
Not signed in
Basic on-page data scraped from the page (tile prices, ratings, reviews, and the niche banner). BSR, monthly sales, listing age, keyword volume, and history are locked.
Free account
Unlocks BSR and monthly sales, the BUY/PASS verdict, and estimated fees/profit - subject to your monthly Sourcer-lookup quota.
+ Amazon SP-API connected
Real Amazon fees, exact net profit, VAT, and sell-eligibility for your account.
+ Amazon Ads connected
Live keyword search volume and bid ranges.
Paid plan
Sales estimates, Buy Box analytics, seller offers, history charts, private-label detection, brand export, and higher or unlimited lookups.
The practical path for a new seller: sign in free, set your buying criteria, and research with estimates to build a shortlist; connect SP-API before you spend money so the final numbers are real; add a paid plan once you are sourcing at volume and need the analytics and higher limits.
⚠️ Common Mistakes to Avoid
Sourcing on estimated fees
Estimates can be 15-20% off. Connect SP-API for real fees before you buy.
Not setting your buying criteria
The BUY/PASS verdict is only as good as the Max BSR / Min Profit / ROI / Margin values you enter.
Forgetting your VAT rate
Profit is overstated because VAT is not deducted.
Leaving auto-fetch BSR on everywhere
It spends a lookup per product; turn it on only when you need it.
Ignoring seller count / Buy Box share
A great ROI means little if many sellers already compete for the box.
Judging a niche by one product
Use the search banner and Niche Mapper - a single good ASIN can sit in a brutal niche.
✅ Best Practices
Connect SP-API early so every profit number uses your real fees, not estimates.
Set your buying criteria and VAT once so the verdict and calculator are accurate from day one.
Use the Niche Mapper on search pages to grab the top ASINs and export them for deeper analysis.
Use the Profit Calculator to find your supplier ceiling (Maximum Cost) before you ever contact a supplier.
Jump to the dashboard (Open in dashboard) when you need full history, Buy Box trends, or to save products to your Watchlist.
Keep the extension updated via Chrome so fee tables and data stay current.
🔧 Troubleshooting
Panel does not appear
Make sure you are on an Amazon product/search page (not Seller Central). Refresh the page.
BSR / sales show "Sign in to unlock"
Click the icon and sign in - a free account unlocks them.
Fees look off
Check the fee-source label. Estimated fees are approximate; connect SP-API for real fees.
Keyword volume is empty
Connect an Amazon Ads account; without it you may see bids only.
Nothing loads
Check your connection and that SellerMagnet is not paused (red kill-switch in the popup).
Verdict says NO DATA
Sign in and click Get BSR for that product so it has enough to judge.
❓ FAQ
Do I need a paid subscription to use the extension?
No. You can sign in for free (no credit card) and even try a demo session. A free account unlocks BSR, monthly sales, the verdict, and estimated profit. A paid plan adds sales estimates, analytics, history charts, and higher lookup limits.
What is the difference between "estimated" and "real" fees?
Estimated fees are approximated from public data and can differ from Amazon's real fees by roughly 15-20%. Once you Connect Amazon (SP-API), the extension shows Real fees (your SP-API) and exact net profit for your account.
Does the extension work in Firefox or Edge?
It is built for Google Chrome. Chromium browsers like Edge and Brave can usually install it from the Chrome Web Store, but official support is Chrome only.
Does the extension use my Sourcer lookup quota?
Fetching data (for example, pulling BSR for a product or a results tile) counts against your monthly Sourcer-lookup quota shown in the popup. Auto-fetch options spend quota automatically, so leave them off unless you want them.
Does it work inside Seller Central?
No. The extension is intentionally excluded from sellercentral.amazon.*. It runs on the public Amazon storefront (product pages, search, brand stores, seller storefronts).
Does the extension track my browsing?
It only activates on Amazon domains and sends the ASIN/keyword you are viewing to SellerMagnet to return data. It does not track other browsing.
➡️ What's Next?
Product SourcerIdentifier ConverterLast updated