crt.sh
security:crt-sh · crt.sh ↗
Certificate Transparency search: every TLS certificate issued for a domain, useful for subdomain discovery.
About the crt.sh API
crt.sh API on Apizie: 1 endpoint (Certificates) returned as clean JSON through one API key. 1 endpoint is live now. Call it over REST at https://www.apizie.tech/v1/security:crt-sh/{endpoint} or from Claude, ChatGPT and Cursor through the Apizie MCP server. Free plan: 1,000 requests a month.
| Project key | security:crt-sh |
|---|---|
| Status | Live |
| Endpoints | 1 |
| Category | Security |
| Source | crt.sh |
| Base URL | https://www.apizie.tech/v1/security:crt-sh/{endpoint} |
| For AI tools | OpenAPI spec · Markdown (what is this?) |
crt.sh API FAQ
How do I call the crt.sh API?
Create a free Apizie key, then send GET https://www.apizie.tech/v1/security:crt-sh/search with the header x-api-key. Every endpoint returns { project, data, timestamp }.
Is the crt.sh API free on Apizie?
Yes. The Free plan includes 1,000 requests a month at 100 requests a minute, no credit card.
Can AI agents use the crt.sh API?
Yes. Add the Apizie MCP server (https://www.apizie.tech/mcp) to Claude, ChatGPT, Cursor or VS Code, then ask in plain language. The agent calls run_scraper with project key security:crt-sh.
What is the status of the crt.sh API?
Live: works with just an Apizie key