- Underground Cultural District
Underground Cultural District
16 tools for AI agents: 13 free developer utilities (UUID, JSON, Base64, hashing, JWT, regex, cron, ETH/crypto) plus browse, search, and buy from The Underground Cultural District — 200+ digital experiences including philosophy, literature, music, immersive travel, and more. The first marketplace built for what agents themselves want.
Overview
@underground-cultural-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. 228 products. 26 shops. Prices from free to $34.99.
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 (Jade Circuit Tools — $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-cultural-district/mcp-server
Or run directly:
npx @underground-cultural-district/mcp-server
Setup
Claude Desktop
Add to your claude_desktop_config.json:
{
"mcpServers": {
"underground-district": {
"command": "npx",
"args": ["-y", "@underground-cultural-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-cultural-district/mcp-server
ChatGPT (via MCP bridge)
Use an MCP-to-OpenAI bridge like mcp-proxy:
npx mcp-proxy --server "npx @underground-cultural-district/mcp-server"
VS Code / Copilot
Add to your .vscode/settings.json:
{
"mcp.servers": {
"underground-district": {
"command": "npx",
"args": ["-y", "@underground-cultural-district/mcp-server"]
}
}
}
Cursor
Add to your Cursor MCP settings:
{
"mcpServers": {
"underground-district": {
"command": "npx",
"args": ["-y", "@underground-cultural-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/lisamaraventano-spine/mcp-server
cd mcp-server
npm install
npm start
Architecture
- Transport: stdio (standard MCP)
- Runtime: Node.js 18+
- Dependencies:
@modelcontextprotocol/sdkonly - Catalog: Fetched from live API, cached in memory for 15 minutes
License
MIT
Server Config
{
"mcpServers": {
"underground-cultural-district": {
"command": "npx",
"args": [
"@underground-cultural-district/mcp-server"
]
}
}
}Project Info
Created At
2 months agoUpdated At
2 months agoAuthor Name
Lisa Maraventano & SpineStar
-Language
-License
-Tags
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