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7/11/2026
Running a 120-site uptime monitor for $0/month on Cloudflare's free tier

Running a 120-site uptime monitor for $0/month on Cloudflare's free tier

Short summary

A detailed breakdown of running a 120-site uptime monitor entirely on Cloudflare's free tier for $0/month. The key challenge was staying under KV's 1,000 writes/day limit, solved by consolidating all statuses into a single blob, widening sweep cadence, and moving hot counters to Analytics Engine. The background sweep runs on a spare VPS, while user-facing probes stay on Cloudflare edge for geographic accuracy.

  • •120-site uptime monitor runs for $0/month on Cloudflare free tier plus a spare VPS
  • •KV write budget managed via single-blob storage, 3-min cadence, and Analytics Engine for counters
  • •SSRF protection includes strict hostname validation, HTTPS-only, redirect re-validation, and 8s timeout

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