AI chatbot and GPT builds
「Selling the setup, not the AI」
Clients can use ChatGPT. What they will not do is wire it to their own documents. That labour is the product.
Build chatbots fitted to a client's own documents. What is sold is not AI but the configuration against one company's material — that is the whole model.
- Difficulty
- 4/5
- To first revenue
- A demo takes days to build. Time to a first order is not something we estimate.
- Startup cost
- ₩30,000~300,000
- Coding
- some
- 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 — DELUXE
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)−₩57,400
- Payment network fee (3.3%)−₩11,550
- VAT on those fees (위 두 항목의 10%)−₩6,895
Output VAT ₩31,818 − input VAT on fees ₩6,895−₩24,923
⚠️ 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.
| Tier | List price | Days | Max/mo | Revenue ceiling | Operating profit |
|---|---|---|---|---|---|
| STANDARD | ₩150,000 | 3d | 6 | ₩900,000 | ₩640,884₩32,044/day |
| DELUXE | ₩350,000 | 5d | 4 | ₩1,400,000 | ₩996,928₩49,846/day |
| PREMIUM | ₩700,000 | 7d | 2 | ₩1,400,000 | ₩996,928₩49,846/day |
↔ Swipe sideways
A higher tier does not raise the ceiling. PREMIUM costs 2× what DELUXE does, but takes 1.4× as long, so the monthly ceiling ends up identical. What raises the ceiling is not the price — it is finishing the same job faster. That is the part AI actually does here.
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
- Companies with heavy internal documentation
- Teams with repetitive enquiries
How the money comes in
- Build fee (fixed packages)
- Monthly maintenance
Steps
- Build a document-search chatbot over your own files — the demo is the portfolio
- Split packages by scope, turnaround and revision count, not by outcome
- List only the smallest package first
- Ship a usage guide with the build — fewer follow-up questions is a higher hourly rate
Tools used
Claude API · OpenAI API · Gemini API
Linked tools are ones whose pricing we checked and listed.
Risks
- The expertise bar is high. Credentials do the trust work in this market
- Accuracy turns on document structure more than volume; getting it wrong means rework
- You handle confidential files, so settle where processing happens before contracting
- ⚠️ On the Korean marketplace this barely transacts. A 2026-08-20 count found 28 of the top 40 chatbot listings with zero reviews, at a list price above the survey median
Verified cases using this model
BMostly confirmedSelling AI chatbot builds on a Korean freelance marketplace, alongside a full-time job
Nunnopi Coding — custom AI chatbot and GPT automation builds · KR · Revenue not disclosed
Compare with
- Level 3AI automation agency「Taking the repetition nobody wants」
- Level 2AI content operations「Same date every month」
- Level 2Marketplace seller support「Riding on someone else's revenue」
Do this today
- Search a marketplace for “AI chatbot build” and write down the top ten price lists
- Tabulate the scope those ten have in common
- Pick the smallest scope you could deliver in three days