JEONSEWON

Founder & Full-stack Developer at Axiom Technologies.

I'm on a mission to build software that's actually beneficial to the world, starting with ending the "200 OK Lie."

Currently building checkapi.io—a minimalist API monitoring tool designed to catch the "silent failures" that standard status checks miss. I believe that developer tools should be simple, reliable, and honest.

Based in Seoul. Obsessed with Developer Experience (DX), minimalist architecture, and building sustainable SaaS. Let's build things that matter.

Tech Stack: FastAPI, Next.js, Redis, Celery.
Current Focus: Scalin

Check API

CheckAPI — APIs that never lie to you.

Most uptime monitors only check HTTP status codes (200 OK).
CheckAPI catches "silent failures" by validating the actual response body.

Key features:
• Keyword & Regex matching
• JSONPath assertions (up to 10, AND/OR logic)
• Header assertions + Live Tester
• Heartbeat & Cron monitors
• Public Status Page
• 5 alert channels
• SLA reports + Maintenance Windows

Free plan: 10 monitors, 5-min checks, commercial use forever. No credit card needed.

Solo founder, fully transparent Build in Public. Just launched.

Social Links

X: @imwon_dev

checkapi.io - Stop the "200 OK" Lie

### CheckAPI is now live

Hey Indie Hackers 👋

Tired of APIs returning 200 OK while your users get broken experiences?

I built CheckAPI — an API monitoring tool that actually detects silent failures.

What makes it different
- Keyword & Regex matching
- JSONPath assertions (up to 10)
- Header assertions + Live Tester
- Public Status Page
- 5 alert channels
- SLA reports

Build in Public update
- 7 real users
- MRR: $0 (payments live)
- Free plan: 10 monitors, commercial use forever