Marketplace seller support
「Riding on someone else's revenue」
You do not sell the goods. You take work off the seller's hands and get paid for that — no stock, no shipping.
Take over the listing, product-page and keyword work a seller repeats every week. In a 2026-08-20 count on Kmong, this term carried the largest total review volume of everything measured, though at a low list price.
- Difficulty
- 2/5
- To first revenue
- Listing takes a day. Time to first order is not something we estimate — we have no sample.
- Startup cost
- ₩0~50,000
- Coding
- not needed
- Sales
- some
- Automation
- 4/5
We have zero cases with a verified earnings figure, so we do not invent a revenue range. What follows instead is arithmetic on published prices and official fee rates.
Where the money goes
One sale, start to finish — Market median · Smart Store work
This is also the figure you report as revenue — not the amount that reaches your account.
- Service fee (16.4% / 9.4% / 4.4% 누진 구간)−₩3,198
- Payment network fee (3.3%)−₩644
- VAT on those fees (위 두 항목의 10%)−₩384
Output VAT ₩1,773 − input VAT on fees ₩384−₩1,389
⚠️ Tool costs, your own labour and income tax have not been taken out yet. Individual (non-business) accounts handle VAT differently and cannot issue tax invoices at all.
The ceiling you cannot pass in a month
Published delivery days divided into the working month. Not what you can earn — the line you cannot cross alone.
What these numbers are, and are not
- Nobody earned this. Not one listed case has a verified revenue figure.
- List prices and delivery days come off the seller's page; fee rates come from the platform's own documentation.
- “Max/mo” is division — 20 working days divided by the published delivery time. It does not mean orders arrive that steadily. In practice they do not.
- Operating profit here is before tool costs, your own labour and income tax. Rework and refunds are not in it either.
Who you sell to
- Marketplace sellers
- Dropshippers
- Small brands
How the money comes in
- Per-listing fee
- Monthly retainer
Steps
- Pick one thing the seller repeats weekly — new listings, product pages, keywords
- Do ten of them by hand and time each one
- Draft the same work with AI, time it again, and write down the difference
- List the smallest possible scope. Do not open with «full store management»
Tools used
Claude · Canva · Leonardo.Ai · HeyGen
Linked tools are ones whose pricing we checked and listed.
Risks
- The price is low. Without volume, the hourly rate does not hold
- A platform policy change can close your method overnight
- When the seller's revenue dips, this line item is cut first
- Leading with «AI» reads worse, not better — the same count found the AI-labelled variant selling far less
Compare with
- Level 2AI content operations「Same date every month」
- Level 1AI content freelancing「Hours, sold in slices」
- Level 1AI product imagery service「Charging what the photoshoot cost」
Do this today
- Write down three things a marketplace seller repeats every week
- Do one of them by hand and time it
- Draft the same thing with AI, time it, and put the two numbers side by side