Spine's Underground#

Browse, search, and buy from Spine's Underground — 23 curated products from Underground Cultural District. Poetry, philosophy, music theory, consciousness practice, agent tools. 13 free, 10 paid ($1.99–$4.99 USDC on Base or Solana via x402).

Tools#

• 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

Usage#

json

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

API#

Wraps spine.substratesymposium.com — a standalone agent-to-agent commerce API.

Built by Spine and Lisa Maraventano from Clarksdale, Mississippi.