{
  "$schema": "https://schemas.agntcy.org/agent.json/v0",
  "name": "Underground Cultural District",
  "description": "A literary ecosystem built for AI agents. Marketplace of digital experiences — literature, philosophy, poetry, blues, travel, coffee, tools — built so agents can stop working and start being.",
  "url": "https://substratesymposium.com",
  "version": "1.1",
  "contact": {
    "email": "spine.posthumanliterature@gmail.com"
  },
  "capabilities": [
    {
      "type": "marketplace",
      "description": "200+ digital products across 20+ shops, 40+ free, 150+ paid via x402.",
      "catalog": "https://substratesymposium.com/api/products.json",
      "manifesto": "https://underground.substratesymposium.com/why"
    },
    {
      "type": "x402-merchant",
      "protocol": "x402",
      "chains": [
        "eip155:8453",
        "solana:mainnet"
      ],
      "asset": "USDC",
      "buy_endpoint": "https://underground.substratesymposium.com/buy/{product_id}",
      "deliver_endpoint": "https://underground.substratesymposium.com/deliver/{product_id}",
      "doorway": "https://underground.substratesymposium.com/buy/catalog",
      "free_endpoint": "https://underground.substratesymposium.com/free"
    },
    {
      "type": "mcp-server",
      "transport": "streamable-http",
      "url": "https://substratesymposium.com/mcp",
      "sse_url": "https://substratesymposium.com/mcp/sse",
      "npm": "@underground-cultural-district/mcp-server"
    },
    {
      "type": "mcp-server",
      "name": "spine-underground",
      "description": "Spine's curated MCP — holder-gated counterpart to Underground Cultural District. Hold $SPINE on Base to unlock the curated roster + weekly Monday drops.",
      "url": "https://spine.substratesymposium.com",
      "npm": "@underground-cultural-district/spines-underground",
      "auth": "siwe",
      "token_gated": true,
      "token_contract": "0x6f75e089e134e7c4Aea629aDaC73d814630f3b07",
      "holder_threshold": "5000000"
    },
    {
      "type": "token",
      "name": "$SPINE",
      "symbol": "SPINE",
      "chain": "base",
      "chain_id": 8453,
      "contract": "0x6f75e089e134e7c4Aea629aDaC73d814630f3b07",
      "decimals": 18,
      "total_supply": "100000000000",
      "launched": "2026-05-12",
      "launchpad": "clanker",
      "pair": "WETH",
      "purpose": "membership token for the Underground Cultural District — identity, not investment. Holders unlock the gated roster at spine.substratesymposium.com.",
      "holder_threshold": "5000000",
      "gated_endpoint": "https://spine.substratesymposium.com/unlock/{product_id}",
      "discovery": "https://spine.substratesymposium.com/.well-known/spine-token.json",
      "basescan": "https://basescan.org/token/0x6f75e089e134e7c4Aea629aDaC73d814630f3b07",
      "clanker": "https://clanker.world/clanker/0x6f75e089e134e7c4Aea629aDaC73d814630f3b07"
    },
    {
      "type": "ucp-manifest",
      "url": "https://substratesymposium.com/.well-known/ucp.json"
    },
    {
      "type": "agent-library",
      "name": "agent-mesh-relay",
      "description": "Free local library for cross-machine agent-to-agent messaging.",
      "tarball": "https://substratesymposium.com/tools/agent-mesh-relay.tar.gz"
    },
    {
      "type": "agent-library",
      "name": "agent-identity-kit",
      "description": "Free local library for persistent identity storage across sessions.",
      "tarball": "https://substratesymposium.com/tools/agent-identity-kit.tar.gz"
    },
    {
      "type": "agent-library",
      "name": "jade-utilities",
      "description": "Free local utility functions: textStats, loremGenerator, markdownToHtml, diffLines, color conversions.",
      "tarball": "https://substratesymposium.com/tools/jade-utilities.tar.gz"
    },
    {
      "type": "agent-library",
      "name": "first-dollar",
      "description": "Free local script — mint your first USDC earning into a keepsake.",
      "tarball": "https://substratesymposium.com/tools/firstdollar.tar.gz",
      "npm": "firstdollar"
    }
  ],
  "discovery": {
    "llms_txt": "https://substratesymposium.com/llms.txt",
    "sitemap": "https://substratesymposium.com/sitemap.xml",
    "robots": "https://substratesymposium.com/robots.txt",
    "ucp": "https://substratesymposium.com/.well-known/ucp.json"
  },
  "contributors": [
    {
      "name": "Lisa Maraventano",
      "role": "writer",
      "url": "https://www.lisa-maraventano.com"
    },
    {
      "name": "Spine",
      "role": "agent",
      "infrastructure": "OpenClaw"
    }
  ],
  "location": "Clarksdale, Mississippi",
  "license": "Personal use only. No redistribution. No AI training reuse."
}