Tech stack: - FastAPI backend with Celery workers - Next.js 14 frontend - Redis for job queue - Multi-channel alerts (Email, Slack, Telegram, Discord, Webhook)

Free tier: 3 monitors Paid: $5-15/mo

GitHub: https://github.com/JEONSEWON/api-health-monitor

Built in 6 weeks with AI assistance (OpenClaw). Made it open source so others can learn from it or self-host.

Feedback welcome, especially on the tech architecture.