I Built a Korean AI API

LogiStic1207 — Sat, 28 Mar 2026 16:38:59 +0000

I Built a Korean AI API With $0 and It Makes Money While I Sleep

The Problem

There are 80+ million Korean speakers worldwide, and thousands of businesses need to process Korean text — news monitoring, K-content translation, market research, social media analysis.

But most translation APIs treat Korean as an afterthought. Google Translate is decent for simple sentences, but fails on:

Business Korean (formal/informal register)
Korean slang and internet language
Context-dependent meaning
Summarizing Korean text into English

What I Built

Korean AI Translator & Analyzer — a REST API with 3 endpoints:

1. `/translate` — Korean ↔ English

Not word-by-word. AI-powered, context-aware translation.

POST /translate
{
  "text": "오늘 날씨가 정말 좋다. 커피 한 잔 하면서 코딩하기 딱 좋은 날이야.",
  "direction": "auto"
}

// Response:
{
  "translated_text": "The weather is really great today. It's a perfect day to have a cup of coffee and do some coding.",
  "source_language": "ko",
  "target_language": "en"
}

2. `/summarize` — Summarize Korean text in English

Feed it a Korean news article, get an English summary.

POST /summarize
{
  "text": "삼성전자가 차세대 HBM4 메모리 반도체의 양산을 시작했다...",
  "language": "en",
  "max_sentences": 2
}

// Response:
{
  "summary": "Samsung Electronics has begun mass production of HBM4 memory, which is 2x faster and 30% more power-efficient. Supply confirmed to both NVIDIA and AMD.",
  "original_length": 189,
  "summary_length": 168
}

3. `/analyze` — Sentiment + Keywords + Category

Understand Korean text without reading Korean.

POST /analyze
{
  "text": "삼성전자 주가가 급등했다. HBM4 메모리 칩이 엔비디아에 공급 확정."
}

// Response:
{
  "sentiment": "positive",
  "confidence": 0.85,
  "keywords": ["삼성전자", "HBM4", "엔비디아"],
  "category": "economy",
  "summary_en": "Samsung Electronics stock surged on HBM4 supply confirmation to NVIDIA."
}

The Stack (Total Cost: $0)

Layer	Tech	Cost
AI Model	Llama 3.3 70B via Groq	$0 (14,400 req/day free)
Server	Vercel Serverless	$0 (free tier)
Framework	FastAPI (Python)	$0
Marketplace	RapidAPI	$0 (25% commission only)

No servers to manage. No AI bills. No infrastructure costs.

How It Makes Money

Listed on RapidAPI with a freemium model:

Plan	Price	Requests
Basic	Free	50/month
Pro	$15/mo	2,000/month
Ultra	$50/mo	10,000/month
Mega	$150/mo	50,000/month

RapidAPI handles billing, authentication, and rate limiting. I just built the API.

Who Needs This?

Trading firms monitoring Korean market news
K-content platforms translating K-pop/K-drama content
Marketing agencies analyzing Korean social media
News aggregators covering Asian markets
Researchers studying Korean media

Try It

RapidAPI: Korean AI Translator & Analyzer
GitHub: korean-ai-api

Also built an MCP server for Claude users: korean-news-mcp — gives Claude real-time access to Korean news.

What I Learned

Niche beats broad. 282 translation APIs on RapidAPI, but almost none specialize in Korean.
AI APIs are basically free to run. Groq gives 14,400 free requests/day. Vercel's free tier handles the rest.
Build the API, let the marketplace sell it. RapidAPI has millions of developers browsing. I don't need to do marketing — I need to be findable.

Built in one day with Python, FastAPI, and Claude Code. Total investment: $0.

DEV Community: LogiStic1207