Underindex

Name: Underindex
Author: ascanioUnderIndex

by ascanioUnderIndexversion 0.2.0i★ –iRuns on your computer

Registry nameio.github.ascanioUnderIndex/underindex

Install

Overview

Description from the maker (original English)

Verified records on 60 niche fashion subcultures for AI agents, $0.01 per lookup over x402

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
UsageiVery new↓ 51/wk · ★ –

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: Other
You need to fill in: UNDERINDEX_PRIVATE_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: UNDERINDEX_PRIVATE_KEY, UNDERINDEX_MAX_PER_CALL

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

You need

npmNode.js installed (for the npx 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": {
    "underindex": {
      "command": "npx",
      "args": [
        "-y",
        "underindex-mcp"
      ],
      "env": {
        "UNDERINDEX_PRIVATE_KEY": "your-value",
        "UNDERINDEX_MAX_PER_CALL": "your-value"
      }
    }
  }
}

Run this in your terminal

claude mcp add underindex --env UNDERINDEX_PRIVATE_KEY=your-value --env UNDERINDEX_MAX_PER_CALL=your-value -- npx -y underindex-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": {
    "underindex": {
      "command": "npx",
      "args": [
        "-y",
        "underindex-mcp"
      ],
      "env": {
        "UNDERINDEX_PRIVATE_KEY": "your-value",
        "UNDERINDEX_MAX_PER_CALL": "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": {
    "underindex": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "underindex-mcp"
      ],
      "env": {
        "UNDERINDEX_PRIVATE_KEY": "your-value",
        "UNDERINDEX_MAX_PER_CALL": "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

UNDERINDEX_PRIVATE_KEY secret env
Private key of a dedicated EVM wallet holding USDC on Base. Optional: without it get_subculture uses the free allowance of 3 records a day.
UNDERINDEX_MAX_PER_CALL env
Hard spending cap per lookup, default $0.05

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 8, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account ascanioUnderIndex, 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 Otheri

More stars than 0% of the other 18600 servers in this category
Published to the registry more recently than 68% of the other 18600 servers in this category
Basic checks equal to or better than 100% of the other 18600 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 Underindex 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: UNDERINDEX_PRIVATE_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 19 days ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need Node.js on your computer.

What can I use instead?

In the same category: Spec Driven Development, Remote Desktop Commander, alalanet — check before you pay

Alternatives

Servers in the same category from other makers, sorted by stars.

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

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by formulahendryEarly↓ 66/wk★ 440Updated 14 months ago

Runs on your computer

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Remote Desktop Commander

Remote Desktop Commander: use files, terminal and processes on your own computers from any AI app.

by desktop-commanderGrowing★ 211Updated 3 days ago

Runs in the cloud✓ desktopcommander.app

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alalanet — check before you pay

Check packages, MCP servers and x402 endpoints before agents install or pay. Signed.

by alalanetEarlyUpdated today

Runs in the cloud✓ alalanet.com

Install

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.

UnderIndex MCP server

Gives Claude (or any MCP client) verified records on 60 niche fashion subcultures: years, key brands, iconic items, music, where to buy, a price range, and a WARNING note on what each one must not be confused with. It is the UnderIndex API as three tools.

Tool	Cost	What it does
`list_subcultures`	free	Every slug with its name and years
`get_sample_record`	free	One complete record (Goth Ninja), to see the shape
`get_subculture`	3 free a day, then $0.01 USDC on Base	One record, paid automatically over x402

Without a wallet key get_subculture uses the free allowance: 3 records a day, resetting at midnight UTC. After that it explains how to enable payments. With a key set, every lookup is paid.

Install

Requires Node.js 20 or later. Nothing to download: npx fetches the underindex-mcp package on first run.

Claude Desktop

Add this to claude_desktop_config.json (Settings → Developer → Edit Config):

"mcpServers": { "underindex": { "command": "npx", "args": ["-y", "underindex-mcp"], "env": { "UNDERINDEX_PRIVATE_KEY": "0x..." } } } }

Claude Code

claude mcp add underindex -e UNDERINDEX_PRIVATE_KEY=0x... -- npx -y underindex-mcp

Leave out UNDERINDEX_PRIVATE_KEY to use only the free tools.

Configuration

Variable	Default	Notes
`UNDERINDEX_PRIVATE_KEY`	none	Private key of an EVM wallet holding USDC on Base. Use a dedicated wallet with a few dollars in it, never your main one.
`UNDERINDEX_MAX_PER_CALL`	`$0.05`	Hard cap per lookup. The server refuses to pay more than this, whatever the API asks.
`UNDERINDEX_API_URL`	`https://underindex-api.onrender.com`	Point it at a self-hosted server, e.g. one running on Base Sepolia testnet.

An unknown slug returns 404 before any payment is requested, so typos cost nothing. Each paid answer ends with a link to the payment on BaseScan.

Try it for free

The API's own server starts on Base Sepolia testnet when self-hosted, where test USDC is free from a faucet. Run it as described in the main README, then set UNDERINDEX_API_URL=http://localhost:3000 and a testnet wallet key.

Underindex

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 Otheri

Common questions

Alternatives

Spec Driven Development

Remote Desktop Commander

alalanet — check before you pay

README from the maker

UnderIndex MCP server

Install

Claude Desktop

Claude Code

Configuration

Try it for free