MCP server

Crtsh

io.github.pipeworx-io/crtsh

Checked 26 Oct 2026, 08:29 UTC · Connected to it and listed its tools

crt.sh — Certificate Transparency log search

Website Source

At a glance

Type

MCP server

Publisher

pipeworx.io (verified by the MCP Registry)

Status

Working at last check

Tools

44

Token cost

About 27,023 tokens per request

Sets up in

Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok

Last checked

26 Oct 2026, 08:29 UTC

Connect it to your agent

Add to CursorAdd to VS CodeVS Code Insiders

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

claude mcp add --transport http crtsh https://gateway.pipeworx.io/crtsh/mcp

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

[mcp_servers.crtsh]
url = "https://gateway.pipeworx.io/crtsh/mcp"

Gemini CLI

{"mcpServers":{"crtsh":{"httpUrl":"https://gateway.pipeworx.io/crtsh/mcp"}}}

Cursor

{"mcpServers":{"crtsh":{"url":"https://gateway.pipeworx.io/crtsh/mcp"}}}

VS Code

{"servers":{"crtsh":{"type":"http","url":"https://gateway.pipeworx.io/crtsh/mcp"}}}

Antigravity

agy mcp add crtsh https://gateway.pipeworx.io/crtsh/mcp

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"crtsh","server_url":"https://gateway.pipeworx.io/crtsh/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"crtsh","server_url":"https://gateway.pipeworx.io/crtsh/mcp"}

Tools

• crtsh_certificate ~291 tokens
  "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 the PEM body plus the logged metadata (issuer, common name, SANs, validity window). Use after crtsh_
• crtsh_search_domain ~429 tokens
  "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 Certificate Transparency logs for a domain and (by default) its subdomains, from crt.sh. AUTHORITATIVE f

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• GitHub tools
• Web scraping
• Web search
• Domains and DNS
• GitHub and code hosting

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