Docs
Documentation
Everything you need to integrate Certack: monitor certificates, DNS records and domain expiry from your own tooling, or let an AI assistant query them for you.
REST API reference
Authentication with ct_ API keys, every endpoint, request/response examples, rate limits and monthly quotas.
Open referenceOpenAPI specification
Machine-readable OpenAPI 3 definition. Import it into Postman, Insomnia or your own client generator.
Download spechttps://certack.comMCP server
Let AI assistants check certificates and DNS directly. The public endpoint needs no authentication and exposes check_ssl, check_dns and check_domain.
Endpointhttps://certack.comMachine-readable summaries
llms.txt, llms-full.txt and docs/api.txt describe the product, plans and full API in plain markdown for LLM-based agents and AI search engines.
View llms.txtService status
Live health of the monitoring platform, refreshed every 60 seconds.
View statusAI assistants
Setup with one prompt
Provide the following prompt to an AI assistant. The assistant reads the skill file (SKILL.md) and configures monitoring.
Quick start
Create an API key in your dashboard, then call the monitoring endpoints with anAuthorization: Bearer ct_…header. Free accounts get 100 calls per month at 1 QPS; paid plans raise both limits and return the remaining budget in X-RateLimit-* headers.