1 · Get found
Rank for the searches that sell
Keyword research, backend search terms and Sponsored Products, Brands and Display campaigns built around the terms that convert at a profit.
Nebula for Amazon and marketplace sellers
More Amazon, Walmart and TikTok Shop orders, profitable after fees
Our team runs your Amazon ads and listings, plus Walmart Marketplace and TikTok Shop. Every product is priced after fees and product cost, so ad money goes to the listings that earn a profit.
Profit after fees Stronger listings More channels covered
Nebula dashboardChecked last night
Buy Box loss
Amazon Ads kept spending on 4 products for 9 days while another seller held the Buy Box.
$1,320in wasted ad spendPause ads
Illustrative example, not a real client. Each change runs only after you approve it.
ACoS compares ad cost with ad sales. We show what each product earns after every fee and its own cost.
What you get
What changes for your listings
Four changes that turn ad spend into profit you can check on every listing.
Break-even for every product
We work out each product's break-even return after referral fees, fulfillment fees and product cost. Ads below it get cut. Ads above it get room to grow.
Listings that turn views into orders
Titles, bullets, images, A+ content and backend search terms written for how shoppers search, with reviews and customer questions checked every week.
Ads that follow stock and Buy Box
Ads pause on products about to stock out or where another seller holds the Buy Box, then resume when you can make the sale again.
Walmart and TikTok Shop in one view
Walmart Marketplace and TikTok Shop sit beside Amazon on one profit basis. Budget moves to the channel that earns the order after its own fees.
Problems we fix
Where marketplace sellers lose margin
Three problems the ad consoles do not show. Each one is plain to see once fees and product cost are counted.
32%
Amazon sellers who said growing advertising expenses were a concern for 2025
ACoS hides what is left after fees
Amazon reports ACoS, your ad cost as a share of ad sales. It leaves out the referral fee, the fulfillment fee and your product cost. Products that look fine in the console can lose money on every sale.
Source: Jungle Scout, State of the Amazon Seller 2025 (opens in a new tab)
Ads keep running when you cannot sell
Ads keep spending on products about to stock out or where another seller holds the Buy Box. You pay for the clicks, and the orders go to someone else.
Retailers report their own ad results
Walmart and TikTok Shop report the sales their own ads claim, and TikTok Shop also takes creator commissions. Without your own order data beside their numbers, a strong-looking campaign can lose money.
How we help
From search term to settled order
One team runs ads, listings, stock checks and reporting across all your marketplaces.
2 · Get chosen
Listings that win the click
Images, titles, bullets and A+ content tested for click rate and order rate. Reviews, ratings and customer questions are checked, with fixes when a listing slips.
3 · Get ordered
Hold the Buy Box and keep stock
We check Buy Box share, stock cover and price against other sellers every day, and pause ads when a listing cannot convert.
4 · Know what is working
Profit per product after every fee
Each product is priced after referral fees, fulfillment, storage, product cost and ad spend, with Amazon, Walmart and TikTok Shop side by side.
Key moments
Ready for the events that move sales
Prime Day, the holidays, fee changes and new sellers on your listings each need a plan. We set budget, stock and bids ahead of each one.
- 1
When
Prime Day
We set budgets by product margin, check stock covers the event and raise bids only on products that stay profitable at the deal price.
- 2
When
Holiday season
We plan fourth-quarter stock and ad budget together, so bestsellers do not sell out in mid-December while ads still run.
- 3
When
Annual fee changes
When Amazon updates its fees, we rework break-even for every product and adjust bids before losses build up.
- 4
When
A new seller appears
If another seller takes the Buy Box on your listing, ads pause and we flag the price, stock and brand protection steps for you.
What is included
What we manage on each marketplace
Your plan is scoped to your market. These are the pieces most Amazon and marketplace sellers use.
Amazon ads managed to break-even
Sponsored Products, Brands and Display campaigns with bids set from each product's break-even return after fees.
Wasted search term cleanup
Search terms that spend with no sales become negative keywords, checked against the terms that did sell.
Listing content and images
Titles, bullets, A+ content and image sets written and tested for the way shoppers search your category.
Stock and Buy Box checks
Ads pause when a product is about to stock out or loses the Buy Box, and resume when it can sell again.
Walmart Marketplace management
Listings and Walmart Connect ads, with spend paced to your monthly plan and checked against your own orders.
TikTok Shop ads and creators
Shop ads with creator commissions counted, so you see margin after spend on every campaign.
Fee checks every month
Settled fees compared with expected fees, product by product. You get a list of the differences to file with Amazon.
Ad report history kept
Amazon deletes most ad report history after a few months. Our software stores it from the first night, so decisions rest on more data.
Reporting
Profit you can see, product by product
Your dashboard reads Amazon Ads and Seller Central or Walmart Connect every night and matches each job to the ad, listing or call that started it. Your account lead walks you through it every month.
Amazon profit after fees, last 30 days
Today, 6:10amOrders, 30 days9,480+10% vs. start
Profit per order after fees$7.90+$1.40 vs. start
Ad cost of total sales11.2%−2.6 points
Below break-evenInsulated tumbler ads ran at ROAS 2.2 against a break-even of 3.0 after fees and product cost
$740Lower bidsBuy Box lossAds kept running on 4 products for 9 days while another seller held the Buy Box
$1,320Pause adsWasted search terms63 search terms spent money with no attributed sales in 30 days
$1,085Add negativesProfit after fees
What each product leaves after referral, fulfillment and storage fees, product cost and ad spend.
Total ad cost of sales
All ad spend divided by all sales of a product, known as TACoS, set against its break-even.
Buy Box share
How often you hold the Buy Box on your top products. It decides whether your ads can turn into orders.
Listing conversion rate
Orders per listing visit. It shows when images, price or reviews need work.
Sales by marketplace
Orders and profit on Amazon, Walmart and TikTok Shop side by side, on one cost basis.
Works with the systems you already use. We confirm each connection during your audit.
Amazon Ads and Seller CentralWalmart ConnectTikTokShopifyGoogle AdsMeta (Facebook and Instagram) adsGoogle Analytics 4QuickBooksXero
Recommended
Where sellers usually start with us
Start with what you need most. Add more when the numbers say it is worth it.
Managed programs Run for you by your account lead
Advertising management
Amazon, Walmart Connect and TikTok Shop ads run to each product's break-even, with stock and Buy Box checks.
Profit and reporting
Profit per product after referral, fulfillment and storage fees, product cost and ad spend.
Store performance
Listing quality, Buy Box share and stock cover, checked every day across your marketplaces.
Creative and social
Listing images, A+ content and video tested for click rate and order rate.
Free, no obligation
A free audit of your seller account
We review where your shop loses booked jobs today and send you a written plan, ranked by what each fix is worth.
- Advertised products below break-even after Amazon fees
- Search terms spending with no sales
- Titles, images, A+ content and reviews on your top products
- Buy Box share and stock cover on advertised products
- Walmart Marketplace and TikTok Shop spend against your orders
- Competitor listings, prices and sponsored placements
1. Send the formAbout two minutes.
2. We reviewYour marketing and your top three competitors.
3. Get your planWritten audit within 3 business days.
Get your free audit
We confirm within one business day. No obligation.
Questions
Seller questions about fees and ads
Cost, contracts, ownership and timing, answered plainly.
All questionsWhat does marketplace management cost with Nebula?
It depends on how many marketplaces we run, the number of products you advertise, how much listing and creative work you need and whether we also manage your own store. We do not publish prices. After the free audit you get a written quote with each item listed. Your ad budget stays separate from our fee.
Is there a long contract?
No. Service is month-to-month with no setup fee. You can cancel and keep everything we built for you.
Who owns the seller and ad accounts?
You do. Seller Central, your ad accounts, Walmart and TikTok Shop accounts, listings and all creative stay in your name. If you leave, you keep all of it.
How does ad spend work next to your fee?
Your ad budget is paid directly to Amazon, Walmart, TikTok and other platforms from your own accounts. Our fee is billed separately and shown on its own line, so you always see both numbers.
How soon will we see results?
Your first findings arrive the morning after we connect your accounts. Cutting ads below break-even and wasted search terms can show within weeks. Listing and ranking work builds over several months. Each monthly review shows the progress.
How much of my time does this take?
Plan on a kickoff call and about an hour to grant access. After that, a monthly review of about 30 minutes, quick approvals when we propose a change and sign-off on new listing content. Your named US account lead handles the rest.
Do I need my product costs loaded?
Yes, for profit figures. We take product cost from your store or a file you send. If cost is missing for many units, we show no profit figure for those products and ask for the cost first, so a missing cost is never counted as zero.
Do you also manage Walmart and TikTok Shop?
Yes. We manage Walmart Marketplace listings and Walmart Connect ads, and TikTok Shop ads with creator commissions counted. Each sits beside Amazon on one profit basis, so budget goes to the channel that earns the order.
Also in ecommerce
Other ecommerce we serve
Sell more on Amazon and keep more
Ask for a free audit of your Amazon, Walmart and TikTok Shop accounts. You get a written list of the top fixes in priority order.