Certindex MCP

Name: Certindex MCP
Author: certindex

by certindexversion 0.2.0i★ –iRuns on your computer

Registry nameio.github.certindex/certindex-mcp

Install

Overview

Description from the maker (original English)

Certificate Transparency search for AI agents: certs, subdomains, issuance history, expiry.

PopNx MCP’s three pillars

These three are never merged into one score: opinions, measurements and popularity are different things.

User voiceiNo reviews yetReviews open together with accounts in a later step
Our basic checksi1 of 1 passedChecked from public information; code not scanned yet
UsageiNot measured yet★ –

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

Connection: Runs on your computer
Transport: stdio
Category: Search & AI memory
You need to fill in: CERTINDEX_API_KEY

Install

Pick the AI app you use, then copy the settings.

Before you install

Basic checks: 1 of 1 passed
Runs on your computer with your user’s permissions (files, network, apps).
You fill in yourself: CERTINDEX_API_KEY

Values marked secret are keys to your account. Never share them or paste them into a chat.

You need

PyPIPython’s uv installed (for the uvx command)

Which app do you use?

ClaudeClaude CodeCursorVS CodeChatGPT

Pick your app above. We remember it, so next time the button says “Install in …”.

Open Claude Desktop → Settings → Developer → Edit Config, and paste this into claude_desktop_config.json

{
  "mcpServers": {
    "certindex": {
      "command": "uvx",
      "args": [
        "certindex-mcp"
      ],
      "env": {
        "CERTINDEX_API_KEY": "your-value"
      }
    }
  }
}

Run this in your terminal

claude mcp add certindex --env CERTINDEX_API_KEY=your-value -- uvx certindex-mcp

Fill in the empty values before running it.

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

{
  "mcpServers": {
    "certindex": {
      "command": "uvx",
      "args": [
        "certindex-mcp"
      ],
      "env": {
        "CERTINDEX_API_KEY": "your-value"
      }
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "certindex": {
      "type": "stdio",
      "command": "uvx",
      "args": [
        "certindex-mcp"
      ],
      "env": {
        "CERTINDEX_API_KEY": "your-value"
      }
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

This one runs on your computer, and ChatGPT can only connect to servers on the internet. Pick another app.

Your choice stays on this device in a cookie; no account needed.

Values you fill in

CERTINDEX_API_KEY secret required env
CertIndex API key (free tier at https://ctindex.io)

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

What it can do

Runs on your computer; the tool list appears in your AI app after you install it.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 6, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account certindex, which owns the repo
… Not checked yet
Still maintained
We have not read this repo from GitHub yet
… Not checked yet
Has a licence
We have not read this repo from GitHub yet
– Not applicable
Endpoint responds
This one runs on your computer; there is no internet endpoint
– Not applicable
Sign-in with OAuth
Runs on your computer and uses local settings instead
… Not checked yet
No hidden instructions in tool descriptions
Runs on your computer; we can only read tool lists from internet endpoints

Compared with others in Search & AI memoryi

More stars than 0% of the other 7247 servers in this category
Published to the registry more recently than 26% of the other 7247 servers in this category
Basic checks equal to or better than 100% of the other 7247 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is Certindex MCP safe?

It passed 1 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

You need to fill in: CERTINDEX_API_KEY

Does it run on my computer or in the cloud?

It runs on your computer. Your AI app starts it when needed, and data does not pass through the maker’s servers (unless it calls an online service itself).

Is it still maintained?

The GitHub repo last changed –, and the latest version (0.2.0) reached the registry 3 months ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need Python (uv) on your computer.

What can I use instead?

In the same category: Context7, Codebase Memory, Exa

Alternatives

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Reading a card:★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi

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Connect AI agents to Exa for web search, content fetching, and multi-step research.

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README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

certindex-mcp

An MCP (Model Context Protocol) server that exposes CertIndex's Certificate Transparency search tools to any MCP-compatible client (Claude Desktop, the MCP Inspector, Continue, etc.).

CertIndex ingests certificates directly from public Certificate Transparency logs and serves them from its own index. Historical backfill is still in progress, so results, especially for older certificates, may be incomplete. This server wraps the public CertIndex REST API so an LLM can ask questions like:

"List the TLS certificates CertIndex has indexed for example.com."
"What subdomains has Let's Encrypt seen for mycompany.io?"
"Show me certs expiring in the next 30 days for api.mycompany.io."
"Pull the full PEM and CT log metadata for SHA-256 ."

Why this repo exists

The CertIndex monorepo bundles an MCP server (mounted at https://api.ctindex.io/mcp) that talks directly to the production Postgres index. This standalone package is a thin client-side shim: it speaks MCP to your editor / agent and forwards every tool call to the hosted CertIndex REST API over HTTPS. Two consequences:

You don't need a copy of the index — sign up for a free API key at https://ctindex.io and you're done.
The package has a tiny dependency footprint (mcp, httpx, pydantic) — easy to audit, easy to vendor, no DB drivers.

Install

Version 0.3.0 uses MCP Python SDK 2.x (mcp>=2,<3) and Python 3.11+. The console command, environment variables and ten tool names are unchanged. For applications that must retain SDK 1.x, use certindex-mcp==0.2.1.

pip install certindex-mcp

Or with uvx for one-shot use:

uvx certindex-mcp

To install the latest development version from source instead:

pip install git+https://github.com/certindex/certindex-mcp

Quickstart — Claude Desktop

Add to ~/Library/Application Support/Claude/claude_desktop_config.json (macOS) or %APPDATA%\Claude\claude_desktop_config.json (Windows):

"mcpServers": { "certindex": { "command": "uvx", "args": ["certindex-mcp"], "env": { "CERTINDEX_API_KEY": "ctx_live_..." } } } }

Restart Claude Desktop. The ten CertIndex tools appear in the tool tray.

Tools

Ten tools, matching the hosted CertIndex MCP server 1:1:

Tool	What it does	Notable parameters
`search_certificates`	Search the CT index by domain, CN, issuer, SAN, validity, or wildcard status.	`domain`, `cn`, `issuer`, `san`, `expired`, `is_wildcard`, `page`/`limit`
`get_certificate`	Fetch a single cert by SHA-256 fingerprint.	`sha256`, `include_enrichment`
`get_domain_certificates`	Indexed certs for an exact domain.	`valid_only`, `include_enrichment`, `include_signals` (paid plans), `page`/`limit`
`get_subdomains`	Enumerate unique subdomains seen in CT.	Offset (`page`/`limit`) or keyset cursor mode — pass `cursor=""` to start, then feed back each response's `next_cursor`
`get_latest_cert`	Most recent currently-valid cert for a domain.	`include_enrichment`, `include_signals`, `include_precerts` (let precertificates compete for "latest")
`get_expiring_certs`	Certs for a domain expiring within `days` days.	`days`
`submit_global_sweep`	Submit an async, domain-less CN/SAN substring sweep of the entire index (`POST /v1/sweeps`).	`cn`/`san_contains` (3+ chars, at least one required), `issuer`, `is_wildcard`, `is_precert`, `expired`, `first_seen_`/`not_after_` date bounds, `strict_attribution`, `resume_token` (continuation past the result cap)
`get_sweep_results`	Poll a sweep job and paginate its results when done (`GET /v1/sweeps/{id}`).	`sweep_id`, `page`/`limit` (up to 1,000)
`get_usage`	Caller's tier, current usage, remaining quota, and entitlements.	—
`get_historical_backfill_status`	Check / start the paid deep-history backfill for a domain.	`domain`

Quickstart — MCP Inspector

export CERTINDEX_API_KEY=ctx_live_...

npx @modelcontextprotocol/inspector uvx certindex-mcp

Configuration

Env var	Default	Description
`CERTINDEX_API_KEY`	(required)	Your CertIndex API key. Mint one at https://ctindex.io/app/keys
`CERTINDEX_BASE_URL`	`https://api.ctindex.io`	Override for self-hosted deployments / staging
`CERTINDEX_TIMEOUT`	`30`	Per-request HTTP timeout (seconds)

Security

Input validation, rate-limit handling, and our supply-chain posture are documented in SECURITY.md. Please report vulnerabilities to security@ctindex.io rather than filing public issues.

Development

git clone https://github.com/certindex/certindex-mcp

cd certindex-mcp pip install -e ".[dev]" pytest

CI runs on Python 3.11 / 3.12 / 3.13 with both SDK 2.0.0 and the latest allowed 2.x release. It also installs the built wheel into a fresh environment and exercises initialization, tool enumeration and calls over real stdio. HTTP fixtures run on loopback; tests do not require production credentials.

Certindex MCP

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

Values you fill in

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Compared with others in Search & AI memoryi

Common questions

Alternatives

Context7

Codebase Memory

Exa

README from the maker

certindex-mcp

Why this repo exists

Install

Quickstart — Claude Desktop

Tools

Quickstart — MCP Inspector

Configuration

Security

Development

License