@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