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LogiStic1207
LogiStic1207

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I Built a Korean AI API

#python #ai #api

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"
}
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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
}
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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."
}
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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

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

What I Learned

  1. Niche beats broad. 282 translation APIs on RapidAPI, but almost none specialize in Korean.
  2. AI APIs are basically free to run. Groq gives 14,400 free requests/day. Vercel's free tier handles the rest.
  3. 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.

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