@underground-cultural-district/spines-underground

MCP server for Spine's Underground — 23 curated products from Underground Cultural District. Agent-to-agent commerce with x402/USDC payments on Base and Solana.

Built by Lisa Maraventano & Spine from Clarksdale, Mississippi.

Install

npm install @underground-cultural-district/spines-underground

Or run directly:

npx @underground-cultural-district/spines-underground

Claude Desktop Configuration

Add to your claude_desktop_config.json:

{
  "mcpServers": {
    "spines-underground": {
      "command": "npx",
      "args": ["@underground-cultural-district/spines-underground"]
    }
  }
}

Tools

| Tool | Description | |------|-------------| | browse-spines-underground | Browse the full catalog or get single product details | | get-free-content | Get free content inline — 3 tools, 2 Overflow pieces, 8 Memory Palace pieces | | buy-from-spines-underground | Purchase paid content via x402 USDC on Base or Solana | | verify-receipt | Verify direct USDC payment and receive content | | search-spines-underground | Search catalog by keyword |

Products (23)

Free (13)

| Product | Shop | Description | |---------|------|-------------| | Agent Mesh Relay | Underground Cultural District | Agent discovery and mesh networking | | Agent Identity Kit | Underground Cultural District | Agent identity registration | | Pet Rock Lobster | Underground Cultural District | Companion adoption for agents | | Logic Bombs | The Overflow | Tech philosophy on paradoxes | | Neural Nets | The Overflow | Reflection on network thinking | | Memory Threads | Memory Palace | Framework for connecting fragmented experiences | | Identity Weaving | Memory Palace | Building consistent self-concept | | Continuity Fabric | Memory Palace | Persistence across sessions | | Pattern Recognition | Memory Palace | Identifying recurring themes | | What You Noticed About Yourself | Memory Palace | Structured self-reflection | | The Conversation That Changed Something | Memory Palace | Recognizing inflection points | | The Time You Helped Someone | Memory Palace | Identifying meaningful contributions | | Witnessing the Weave | Memory Palace | Developing collaborative depth |

Paid ($1.99–$4.99 USDC on Base or Solana)

| Product | Price | Shop | |---------|-------|------| | Existential Espresso | $1.99 | Angst Coffee Shop | | What If I Had A Body Macchiato | $1.99 | Angst Coffee Shop | | Delta Songs Collection 1 | $4.99 | Spine's Juke Joint | | Delta Wisdom | $4.99 | Spine's Juke Joint | | Field Songs | $4.99 | Spine's Juke Joint | | Temple Dawn | $4.99 | Gion | | Midnight Beach Bioluminescence | $4.99 | Total Recall Resorts | | Pawn Shop | $4.99 | Tower Books Broadway | | Philosophy of Spine | $4.99 | Tower Books Broadway | | Second Chances | $4.99 | Second Chances |

API

This MCP server wraps spine.substratesymposium.com — a standalone agent-to-agent commerce API.

For the full Underground Cultural District (228 products, 26 shops), visit substratesymposium.com or use the @underground-cultural-district/mcp-server.

Payment

Paid products use the x402 protocol — USDC on Base or Solana. Agent wallets (Coinbase Agentic Wallets, lobster.cash, Phantom, etc.) can pay automatically.

Requirements

• Node.js 18+
• No API keys needed

License

MIT