Know which channels actually made money this week.
ChannelProof turns scattered marketplace reports, fees, shipping, refunds, deposits, and COGS into a weekly contribution-margin digest — before another spreadsheet rebuild steals your Sunday night.
Validation page only. No payment required. Early users get a sample digest built from report exports before any deep integrations are requested.
Weekly margin digest
$4,820 at risk · 6 channels
Etsy fees
Transaction + offsite ad fees pushed best-seller margin from 28% to 17%
Amazon payout
Deposit matched, but FBA storage and returns explain $1,140 variance
Shopify bundle
COGS missing on 63 orders; gross revenue looked profitable, contribution margin unknown
Decision note
“Pause ads on SKU-214 until Etsy fees and return rate are fixed. Shopify direct is now the highest contribution channel after shipping.”
Narrow customer
Owner-operated ecommerce sellers doing roughly $100k–$2M GMV across two or more channels without a finance analyst.
Paid problem
Channel dashboards show activity, but true profit hides behind fees, shipping, returns, ad spend, deposits, and COGS spreadsheets.
Landing test
Join the waitlist to test whether a weekly contribution-margin digest is valuable before a full accounting tool is built.
Day-in-the-life pain
The seller dashboard looks fine until the bank deposit arrives.
Friday night: Amazon shows sales, Shopify shows orders, Etsy shows fees, the shipping app has labels, and the bank account has one blended deposit. You need to decide which channel deserves next week’s ad budget, but the answer is buried in CSVs and a spreadsheet you no longer trust.
Input
Upload Amazon, Shopify, Etsy/eBay/Walmart/TikTok Shop reports plus a COGS sheet or shipping export.
Checks
ChannelProof matches deposits, normalizes fees, flags missing cost fields, and compares margin against prior weeks.
Output
A weekly contribution-margin digest: channel winners, SKU leaks, fee surprises, and exportable notes for the bookkeeper.
Current workaround breaks because every platform optimizes for itself.
Amazon-only tools do not explain Shopify deposits. Store dashboards show gross order activity before all costs. Accounting software is often monthly and too late for ad, pricing, and channel decisions. Spreadsheets work until fee structures, bundles, returns, or product costs move.
What early users get
A margin memo you can act on before month-end bookkeeping.
Deposit matching
Line up marketplace payouts with bank deposits and reporting windows so channel revenue stops being a blended lump.
Fee normalization
Turn Amazon referral fees, Etsy transaction fees, payment processing, shipping labels, refunds, and ad spend into comparable margin lines.
SKU margin drift
Spot SKUs whose contribution margin changed after shipping, COGS, return, or marketplace-fee movement.
Accountant-ready export
Keep the weekly operator view simple while still producing a clean CSV for bookkeeping month-end.
No migration promise
Start with uploads or lightweight connections before asking sellers to replace their accounting stack.
Community evidence
This waitlist tests a repeated public complaint, not a generic analytics pitch.
The evidence points to a specific workflow: sellers have multiple channels, multiple fee models, blended deposits, and spreadsheet-based margin checks. ChannelProof validates the digest first, then learns which integrations matter.
A seller across Amazon, Shopify, and Etsy says all deposits blend together and they manually pull marketplace reports for about three hours every week just to know which channel is profitable.
Another seller expanded beyond Amazon and now cannot clearly connect COGS, marketplace fees, shipping costs, and inventory movement across Shopify and other marketplaces.
A multi-channel discussion names real profit, break-even by product, inventory sync, shipping, and repricing as the workflows still painful for sellers across Amazon, eBay, Walmart, Shopify, and TikTok Shop.
A long-time Amazon/eBay/Etsy seller describes rebuilding the same spreadsheet late at night whenever marketplace fee structures change and margins disappear.
Why not existing tools?
A2X, Link My Books, Sellerboard, accounting suites, inventory tools, and marketplace dashboards all solve pieces of the stack. The open question is whether a seller wants a lightweight weekly operator digest that explains channel and SKU contribution margin before they commit to a heavier accounting or ERP workflow.
How demand will be validated
Waitlist signups will be compared against prior startup-labs experiments. The first validation milestone is not payment: it is whether sellers are willing to share sample exports and review a mock margin digest. Strong signals are repeated requests for SKU-level views, specific channel integrations, and willingness to pay for weekly clarity.