Cloudflare locked me out at 11pm — site down 9 hours. Built FreeTier Sentinel to catch silent failures. Feedback welcome.
I run a few side projects on Cloudflare Workers, GitHub Actions, and Vercel free tiers. Last month I blew through Cloudflare's 100k daily request limit at 11pm and woke up to my marketing site hard-down for 9 hours because Cloudflare had tipped me into "needs paid plan" state and I hadn't checked.
The annoying part: Cloudflare DOES have usage analytics. It just doesn't email you when you're at 80%. Worse — Cloudflare's billing API still returns 200 OK even when your account is locked out. So generic uptime monitors miss it entirely. You need something that catches silent failures, not just HTTP 200.
Same UX gap with Vercel, Render, Supabase — they show usage in their dashboard but the alert ranges from "subscribe to billing emails" to "set up a custom monitor in Datadog" (paid).
So I built FreeTier Sentinel — one dashboard, one email, alerts for every free-tier SaaS you actually use.
Live: https://freetier-sentinel.dev/
Launching on Product Hunt May 12 — would mean a lot to have IH friends there.
Currently free tier: 3 services, 12-hour checks, email alerts. Pro tier coming post-launch (~$5/mo target): unlimited services, 1-hour checks, Discord + Telegram + email.
It's hosted on Cloudflare Workers itself (yes, it monitors its own free tier — turtles all the way down).
There's also a paid API side I shipped last week on x402 (Coinbase's HTTP 402 protocol for agent payments). Same monitoring data, 5 endpoints, AI agents pay per request in USDC on Base — no API keys, no signup. Coinbase Bazaar indexed it the day I shipped (35 records / 20 providers live). I'm fairly sure it's the first free-tier-monitoring dataset on x402, which sounds niche until you remember every agent burning API calls right now is going to want to know what's free.
What I'd love feedback on:
Which SaaS would you most want covered next? Currently Cloudflare + GitHub Actions + Vercel are wired; Supabase/Render/Resend/Neon/R2 coming in the next 2 weeks.
Pricing — is $5/mo right for "I want hourly checks and Discord alerts"?
Anyone interested in beta? First 50 IH sign-ups get Pro free for 6 months — DM your email.
If you want the source / open-issue history: https://github.com/wndnjs3865/freetier-sentinel
Built solo over a weekend — korean indie dev, weekends only, runs on $0/month infra. Validating before adding more SaaS adapters.
Launching on Product Hunt May 12 — [PH URL D-Day 받아서 update]
