spines-underground
Supports payments via Coinbase Agentic Wallets using the x402 protocol for USDC transactions on Base and Solana when purchasing paid content from the catalog.
Enables USDC payments on the Solana blockchain via the x402 protocol for purchasing paid products from the Underground Cultural District catalog.
@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-undergroundOr run directly:
npx @underground-cultural-district/spines-undergroundClaude Desktop Configuration
Add to your claude_desktop_config.json:
{
"mcpServers": {
"spines-underground": {
"command": "npx",
"args": ["@underground-cultural-district/spines-underground"]
}
}
}Tools
Tool | Description |
| Browse the full catalog or get single product details |
| Get free content inline — 3 tools, 2 Overflow pieces, 8 Memory Palace pieces |
| Purchase paid content via x402 USDC on Base or Solana |
| Verify direct USDC payment and receive content |
| 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
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