Supply price · listing price · fees · purchase orders · delivery, in one place
SellerMaru gathers the work a seller does in a day into one place. It joins what your wholesaler charged you, what your marketplace listings are priced at, and the fees actually deducted at settlement — picking out the products losing money each morning, comparing where to buy them, and carrying on through purchase orders, payment, delivery and cancellations on the same screen. The feature list keeps growing; the rule does not — we do not print a number we cannot account for.
Supplier channels connect only through credentials you delegate yourself. They are encrypted and belong to your account alone.
What changes
Margin floor
We read your connected suppliers' prices daily and pull out only what changed against yesterday. Then we take your listing price, subtract the category commission, the shipping you absorb and a provision for loss, and compute the break-even floor — anything selling below it is marked underwater. Every value that went into the calculation can be expanded on screen.
| Supply price | ₩6,400 |
|---|---|
| Shipping | ₩3,000 |
| Category commission | 10.8% |
| Loss provision | 3.0% |
| Break-even floor | ₩10,640 |
| Currently listed at | ₩9,900 Underwater |
The commission and provision rates in this table are values you set, and the working is expandable on the real screen.
Purchase orders and delivery
The sales that came in from the marketplace and the purchase orders you placed upstream sit on the same row. A sale still needing a purchase order stays on today's worklist with the supplier's cutoff beside it, and registration and payment split into two separate approvals. Once shipping starts we follow the tracking number, and when a cancellation or return is reported we show that it was reported — a human does the acting.
| Sold on | Product | Marketplace | State | Delivery |
|---|---|---|---|---|
| 08.14 | 제주 감귤 3kg 가정용 | 쿠팡 | No order yet | — |
| 08.13 | 무선 충전기 15W 3in1 | 쿠팡 | Registered · unpaid | Not checked |
| 08.13 | 코튼 무지 티셔츠 2매 | 쿠팡 | Paid | 1234-5678-9012 |
| 08.12 | 스테인리스 텀블러 500ml | 쿠팡 | Paid | No tracking number |
| 08.12 | 실리콘 주방매트 2P | 쿠팡 | Cancellation reported | Not checked |
State A reported cancellation is an observation from the marketplace, not a settled fact. The row stays here until a human confirms it.
This list holds only sales the marketplace has not yet called delivered. Finished sales are in past orders.
Features
The list keeps growing. Everything below works today, and anything still in preparation says so.
We connect the way each supplier opens. An API where one exists; otherwise your own browser reads the page, or you upload the price file they already send you. Which route a figure arrived by is printed on the screen.
APIBrowser readFile upload
What moved, what broke the floor, and what we failed to read, separated and gathered into one morning screen. You set the thresholds yourself.
Price movementUnderwaterThresholds
Link the products you list on a marketplace to the supplier products behind them. Automatic suggestions are only ever suggestions — confirming and unlinking are always human acts.
UnmatchedMatchedEnded
The break-even selling price, with category commission, shipping and loss provision folded in. One implementation of the formula, and the working is expandable on screen.
Your own costsBreak-evenWorking shown
The marketplace's category rate card, and the departures from it that apply to your account alone, held separately. The floor calculation reads this table rather than an approximation.
Category ratesAccount exceptionsSettlement basis
The listed price and the coupon-applied price sit at equal weight, side by side. Where membership tiers or quantity terms make the figure unknowable, we print the reason instead of a number. Scheduled coupon issuance is in preparation.
Coupon termsApplied priceScheduled issuance (in preparation)
The same pack side by side across suppliers, compared on landed cost with each one's shipping terms resolved into the figure. The cheapest on unit price and the cheapest once shipping lands are frequently not the same supplier.
Landed costSpec axesDenominator stated
Publicly released wholesale auction prices, matched to the same pack spec and compared against your supply price. When markets disagree about direction we report each one separately rather than merging them into a single claim. The public data covers agricultural produce only, so this feature does too.
Auction priceReported per marketProduce only
On the product pages you are already looking at, the winning price and the other sellers are read and recorded exactly as the page states them. No server logs in on your behalf. The browser extension is in preparation.
Winning price observedRank denominator statedBrowser extension (in preparation)
Questions
No. You see public rows plus your own, and there is no third state in between. Anything you add is private by default and is never shared with another tenant.
On the marketplace side the Coupang integration works today and others are being added in turn. A wholesaler that opens the way a supported adapter reads is a registration and nothing more; if it does not, you can still start by uploading the price file they already send you. Tell us who you buy from and we will tell you which of the two applies.
No. The calculation joining supply price, listing price and fees — along with listing matching, purchase orders, delivery and cancellations — works regardless of category. The one exception is the wholesale auction comparison, which rests on public agricultural data and therefore only works for produce. The screen says so where it applies.
Pricing is still being finalised, and will be published on this page with VAT treatment stated when it is. Early users are being onboarded individually — email us and we will walk you through it.
Publicly released wholesale auction prices and price survey data. They are different measurements, so we do not blend them; the auction figure anchors the comparison. Weekly trend direction was contested between markets, beyond ±2%, in 31.8% of series-weeks (measured in-house 2026-08-07; 36.3% on a monthly basis) — which is why we report per market instead of merging them into one sentence. Source, reference date, pack spec and freshness are shown alongside every figure.
Not without your approval. Registration and payment are separate steps, and at each one you approve against the amount the supplier's own system returned. An order that is only registered stays freely cancellable until it is paid.
Connect a single supplier and the movement and floor arrive from the next morning onward. Connect a marketplace account and purchase orders, delivery and cancellations carry on from the same screen. You can also start with a Kakao, Naver or Google account.
Please note · SellerMaru is a tool that reads supply information and provides a basis for your decisions. It is not a party to the sale or brokerage of any goods. Trading terms, settlement, returns and claims are governed by your own contract with the supplier.