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.
Operational
Last checked · response time 123 ms
90-day uptime
Past incidents
No incidents reported.
No incidents reported.
No incidents reported.
No incidents reported.
No incidents reported.
No incidents reported.
No incidents reported.
No incidents reported.
No incidents reported.
No incidents reported.
- Guardian-measuredResolvedACME Directory: HTTP 525 · resolved after 10m
- Guardian-measuredResolvedACME Directory: HTTP 525 · resolved after 5m
- Guardian-measuredResolvedACME Directory: HTTP 525 · resolved (start not recorded)
No incidents reported.
No incidents reported.
No incidents reported.
- Availability incidentEndpoint has failed 3 consecutive polls (latest: HTTP 525)
Recent changes
No changes detected since monitoring began.
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.