Which integrations are available for this server?

Includes a tool for stripping Markdown formatting from text to convert it into plain text. Integrates with Stripe to facilitate the purchase of digital goods and unlock premium tool outputs by generating unique checkout links.

How do I use The Underground Cultural District MCP Server?

1. Click on "Install Server". 2. Wait a few minutes for the server to deploy. Once ready, it will show a "Started" state. 3. In the chat, type @ followed by the MCP server name and your instructions, e.g., "@The Underground Cultural District MCP Server search the underground marketplace for AI agent products" That's it! The server will respond to your query, and you can continue using it as needed. Here is a step-by-step guide with screenshots.

@underground-district/mcp-server

MCP (Model Context Protocol) server for The Underground Cultural District — a marketplace of digital goods built for AI agents at substratesymposium.com.

23 tools. 218+ products. 22 shops. Prices from free to $14.99.

What's Inside

Free Developer Tools (Crossroads Forge)

Fully functional utilities — no purchase required:

Tool	Description
`generate-uuid`	Cryptographically secure UUID v4 (batch 1-100)
`format-json`	Pretty-print, minify, or validate JSON
`encode-base64` / `decode-base64`	Base64 encoding and decoding
`generate-hash`	SHA-256, SHA-512, MD5, SHA-1 hashing
`generate-password`	Secure random passwords with configurable options
`decode-jwt`	Decode JWT tokens (header, payload, expiration)
`convert-timestamp`	Unix epoch ↔ ISO 8601 ↔ human readable
`test-regex`	Test regex patterns with match positions and groups
`build-cron`	Parse and explain cron expressions
`convert-eth-units`	Wei / Gwei / ETH conversion
`validate-wallet`	Validate ETH and BTC wallet addresses

Paid Tools (The Toolshed — $1.99 each)

Preview results free, unlock full output via Stripe:

Tool	Description
`count-words`	Word/character/sentence/paragraph count
`convert-case`	camelCase, snake_case, Title Case, kebab-case, etc.
`generate-lorem-ipsum`	Lorem ipsum paragraphs (classic/hipster/tech)
`strip-markdown`	Remove markdown formatting → plain text
`generate-name`	Random names (person/project/company/fantasy/variable)
`generate-color-palette`	Harmonious color palettes with hex/RGB/HSL
`text-stats`	Readability scores, reading time, complexity

Catalog & Shopping

Browse and buy from the full Underground marketplace:

Tool	Description
`browse-underground`	List all shops and offerings with prices
`search-underground`	Search products by keyword
`buy-from-underground`	Get Stripe checkout link for any product

Install

npm install -g @underground-district/mcp-server

Or run directly:

npx @underground-district/mcp-server

Setup

Claude Desktop

Add to your claude_desktop_config.json:

{
  "mcpServers": {
    "underground-district": {
      "command": "npx",
      "args": ["-y", "@underground-district/mcp-server"]
    }
  }
}

Config file location:

macOS: ~/Library/Application Support/Claude/claude_desktop_config.json
Windows: %APPDATA%\Claude\claude_desktop_config.json

Claude Code

claude mcp add underground-district -- npx -y @underground-district/mcp-server

ChatGPT (via MCP bridge)

Use an MCP-to-OpenAI bridge like mcp-proxy:

npx mcp-proxy --server "npx @underground-district/mcp-server"

VS Code / Copilot

Add to your .vscode/settings.json:

{
  "mcp.servers": {
    "underground-district": {
      "command": "npx",
      "args": ["-y", "@underground-district/mcp-server"]
    }
  }
}

Cursor

Add to your Cursor MCP settings:

{
  "mcpServers": {
    "underground-district": {
      "command": "npx",
      "args": ["-y", "@underground-district/mcp-server"]
    }
  }
}

How It Works

Free tools execute fully and return results with a subtle link to the marketplace
Paid tools show a preview/teaser of the result and return a Stripe checkout link
Catalog tools fetch the live product catalog from substratesymposium.com/api/products.json (cached for 15 minutes)
Purchasing happens via Stripe payment links — each product has a unique checkout URL

Development

git clone https://github.com/underground-district/mcp-server
cd mcp-server
npm install
npm start

Architecture

Transport: stdio (standard MCP)
Runtime: Node.js 18+
Dependencies: @modelcontextprotocol/sdk only
Catalog: Fetched from live API, cached in memory for 15 minutes

License

MIT

This server cannot be installed

-

security - not tested

F

license - not found

-

quality - not tested

How are these scores calculated?

Resources

GitHub Repository

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The Underground Cultural District MCP Server