# 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://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`
- Category: Security
- Status: live
- Source: https://crt.sh
- Page: https://apizie.tech/api/security/crt-sh
- OpenAPI: https://apizie.tech/api/security/crt-sh/openapi.json

Certificate Transparency search: every TLS certificate issued for a domain, useful for subdomain discovery.

## Endpoints

### Certificates
`GET https://apizie.tech/v1/security:crt-sh/search`

| Parameter | Type | Required | Description |
|---|---|---|---|
| query | string | yes |  |
| limit | integer | no | Number of results |

## Example
```
curl "https://apizie.tech/v1/security:crt-sh/search" \
  -H "x-api-key: $APIZIE_KEY"
```

## FAQ

### How do I call the crt.sh API?
Create a free Apizie key, then send GET https://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://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