Ads & Marketing
Ad spend keeps running across several platforms while nobody matches it against what each SKU earns back — a campaign below breakeven quietly eats margin long before the monthly report arrives.
For Shopify merchants
Know the profit of every order — and where it leaks
Seamline consolidates payment, ads, logistics, and product costs for your Shopify store, calculates profit down to every SKU, and puts a number, a confidence, and evidence on every leak with 14 built-in leakage detection rules — reported in a daily briefing to your WeCom or DingTalk group, before losses compound.
Where the money slips away
In a cross-border store, profit rarely dies in one place. It leaks through four cost paths that are almost never settled order by order.
Payments & FX
With multiple currencies and gateways, FX gain/loss, fee-rate changes, and gaps between orders and settlements erode profit every day, while the books only show gross inflow.
Logistics & Refunds
Shipping overcharges, refund losses, and return fees accumulate order by order; when the refund loss rate climbs, the cost in money is usually the last thing anyone sees.
Cost & Data Quality
When a selling SKU has no cost profile or a data source breaks, the reports themselves go wrong — profit looks better than it is, and decisions are made on the distortion.
14 built-in leakage detection rules
Four spend categories, fourteen detection rules — every finding includes the amount, confidence, and evidence you need to act.
Ads & Marketing
Untraceable spend, ROAS below breakeven, and loss-making targeting.
Unallocated ad spend
Spend that cannot be mapped to the store or attributed to any order
Campaign ROAS below breakeven
Spend holds up for consecutive days while attributed ROAS falls below 1
Loss-making SKUs still spending
SKUs with negative 7-day profit keep burning ad budget
Wasted ad budget
Payments & FX
Fee rate above baseline, FX gain/loss, and reconciliation gaps.
FX gain/loss spike
Daily FX gain/loss rate jumps above the 7-day baseline and an absolute threshold
Payment fee rate above baseline
Gateway effective fee rate rises above the 30-day volume-weighted baseline
Platform fee ratio surge
Platform fees as a share of revenue surge vs the 7-day baseline
Order-vs-gateway reconciliation gap
Shopify paid-order net amounts diverge from gateway transaction nets
Payment & FX gain/loss
Logistics & Refunds
Shipping overcharge and rising after-sales costs.
Shipping overcharge
Actual last-mile freight exceeds estimates by a set margin (3PL overbilling)
Refund loss-rate spike
Refund loss rate per SKU or country jumps vs the 7-day baseline
Return fee surge
Return fees multiply vs the 7-day daily average
Dispute & chargeback spike
Gateway disputes spike within a 7-day sliding window
Fulfillment & after-sales costs
Cost & Data Quality
Missing cost profiles and stale data erode report accuracy.
SKU contribution margin drop
Contribution margin falls below the floor or slides beyond the threshold vs baseline
SKU missing cost profile
A selling SKU has no active cost profile, overstating profit
Stale data source
A source fails, or not-ready rows exceed the threshold, silently understating costs
Distorted profit figures
How it works
From install to daily briefing in four steps.
Step 1: Install & set up
One click from the Shopify App Store; OAuth sets up your shop automatically.
Step 2: Configure Costs & Channels
Connect ad and payment platforms via OAuth or credentials, then configure SKU cost profiles, carrier rates, and platform overhead.
Step 3: Auto Sync & Calculate
Scheduled collection pulls orders, ads, FX rates, and gateway flows; a rule-based engine builds SKU-level profit reports.
Step 4: Daily Briefing & Leak Handling
A daily briefing lands in your WeCom/DingTalk group; triage findings as false positives or resolved.
Your data sources, consolidated
Bind Shopify, four ads platforms, and three payment gateways. Exchange rates come from the ECB; logistics costs come from your own carrier rates and billing statements.
- Shopify
- Meta Ads
- Google Ads
- TikTok Ads
- AppLovinAppLovin
- Stripe
- PayPal
- AirwallexAirwallex
- ECB FX RatesECB FX Rates
Built for the two people who own the number
One accounting and detection engine — a daily view of the truth for the owner, a consistent basis for the finance lead.
Store owners
No dashboards to stitch together: the daily briefing lands in your WeCom or DingTalk group with net sales, pre-tax contribution profit, and the leaks found that day — each with its recoverable amount, so you fix the biggest one first.
- Daily profit briefing in your chat group, conclusions first
- Every leak carries an impact amount and a recoverable estimate
- Findings triaged as false positive or resolved, with the status kept
Finance leads
One consistent basis replaces manual spreadsheet stitching: the profit tree drills from GMV down to pre-tax contribution profit per SKU, subject definitions follow a single metric dictionary, and order-vs-gateway reconciliation gaps surface automatically.
- SKU-level profit tree on one metric dictionary’s subject definitions
- Automatic order-vs-gateway reconciliation with gaps flagged
- Original currency, USD, and CNY views side by side
- Cost profiles, carrier rates, and platform overhead set once, applied everywhere
Get Seamline
Install from the Shopify App Store and start with your own store data.
- Early version is free to use
- Full accounting & detection, no feature gates
- Commercial plans are being planned — no pricing yet
Early access is free. Commercial plans will be announced here first — no credit card, no hidden fees.
Security built on Shopify
Shopify embedded app
Merchants sign in through Shopify session tokens — no separate account or password.
HMAC-verified webhooks
Every Shopify webhook is verified with HMAC signatures before it is processed.
Shop-level data isolation
Data is strictly partitioned per store; shop identity is confirmed by Shopify’s signed token.
Read-only data access
Seamline never writes to Shopify, payment, or ad platforms — all connected accounts use read-only credentials.
You decide every action
Seamline surfaces findings and cost analysis for your review. It takes no automatic actions — pausing campaigns, issuing refunds, and all other decisions stay with you.
No credit card needed
The early version is free — start without any payment method.
Common questions, straight answers
What owners and finance leads ask us before installing — answered the way we would answer in an email.
Will Seamline change anything in my store?
No. Seamline is read-only: it never writes to Shopify, your payment gateways, or your ad platforms — all third-party connections use read-only credentials, and every Shopify webhook is verified with an HMAC signature before it is processed.
How soon will I see results after installing?
After the one-click install and OAuth provisioning, you bind your ad and payment platforms and configure cost profiles; scheduled syncs then collect orders, ads, FX rates, and gateway flows and build the SKU-level reports. How long the first complete picture takes depends on the volume of order history your store needs to import — we make no fixed number for it.
Where do the amounts in the reports and findings come from?
Every amount is a deterministic calculation from your own order and billing data combined with the costs you configure — product cost, carrier rates, payment fees, platform fees, and platform overhead. Each finding lists the evidence and confidence behind its number, so you can verify it order by order.
Does it cost anything today?
The early version is free, with the full analytics and detection features and no payment method required. Commercial plans will be announced on this page first — the same wording as the “Get Seamline” section.
How do I actually receive the findings day to day?
All findings live on the Profit leaks page inside the app. On top of that, a daily briefing with the key conclusions is pushed to your WeCom or DingTalk group bot, so you stay informed without logging in.
Know what every order earns — and what every leak costs
Install Seamline, settle profit down to every SKU, and let every leak surface with its number attached.
- Read-only access — never writes to your store
- No credit card — free early access
- Installed from the Shopify App Store