Let's Encrypt ACME Directory
Let's Encrypt ACME v2 API: directory document of the world's largest certificate authority; cert issuance everywhere depends on it.
Outage
Last checked · response time 117 ms
90-day uptime
Monitoring since · 31 days of data
Past incidents
- Guardian-measuredHTTP 525ACME Directory · ongoing (start not recorded)
No incidents reported.
No incidents reported.
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No incidents reported.
Recent changes
No changes detected in 31 days of monitoring (since 2026-06-12).
Integrate
The live status, 90-day uptime figure and change history on this page are also machine-readable: embed the badge, poll the JSON, or subscribe to the feed. No key needed.
Status badge: 
Markdown embed: [](https://guardiandev.ai/apis/letsencrypt-acme)
Machine-readable: JSON (versioned v1, CORS-enabled) · Atom feed of drift & outage events.
Guardian probes https://acme-v02.api.letsencrypt.org/directory about every 5 minutes. How Guardian measures.