Crtsh

liveReference

crt.sh — Certificate Transparency log search

2tools
0msauth
free tier50 calls/day

Tools

crtsh_search_domain

"Find subdomains of [domain]" / "what TLS certificates exist for [domain]" / "certificate transparency for [host]" / "who issued the cert for [site]" — every certificate ever logged to the public Cert

No parameters required.

▶Try it
crtsh_certificate

"Show me certificate [crt.sh id]" / "get the PEM for cert [id]" / "which certificate has serial [hex]" — fetch one logged certificate from crt.sh by its crt.sh id or by its hex serial number. Returns

No parameters required.

▶Try it

Test with curl

The gateway speaks JSON-RPC 2.0 over HTTP POST. You can test any pack directly from the terminal.

List available tools
bash
curl -X POST https://gateway.pipeworx.io/crtsh/mcp \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/list"}'
Call a tool
bash
curl -X POST https://gateway.pipeworx.io/crtsh/mcp \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","id":2,"method":"tools/call","params":{"name":"crtsh_search_domain","arguments":{}}}'

Use with the SDK

Install @pipeworx/sdk to call tools from any TypeScript/Node project.

TypeScript
import { Pipeworx } from '@pipeworx/sdk';
const px = new Pipeworx();
const result = await px.call("crtsh_search_domain", {});
ask_pipeworx
// Or ask in plain English:
const answer = await px.ask("crt");