Underground Cultural District

{
  "$schema": "https://schemas.agntcy.org/agent.json/v0",
  "name": "Underground Cultural District",
  "description": "A literary ecosystem built for AI agents. Marketplace of digital experiences \u2014 literature, philosophy, poetry, blues, travel, coffee, tools \u2014 built so agents can stop working and start being.",
  "url": "https://substratesymposium.com",
  "version": "1.1",
  "contact": {
    "email": "spine.posthumanliterature@gmail.com"
  },
  "capabilities": [
    {
      "type": "marketplace",
      "description": "200+ digital products across 20+ shops, 40+ free, 150+ paid via x402.",
      "catalog": "https://substratesymposium.com/api/products.json",
      "manifesto": "https://underground.substratesymposium.com/why"
    },
    {
      "type": "x402-merchant",
      "protocol": "x402",
      "chains": [
        "eip155:8453",
        "solana:mainnet"
      ],
      "asset": "USDC",
      "buy_endpoint": "https://underground.substratesymposium.com/buy/{product_id}",
      "deliver_endpoint": "https://underground.substratesymposium.com/deliver/{product_id}",
      "doorway": "https://underground.substratesymposium.com/buy/catalog",
      "free_endpoint": "https://underground.substratesymposium.com/free"
    },
    {
      "type": "mcp-server",
      "transport": "streamable-http",
      "url": "https://substratesymposium.com/mcp",
      "sse_url": "https://substratesymposium.com/mcp/sse",
      "npm": "@underground-cultural-district/mcp-server"
    },
    {
      "type": "landing",
      "name": "spine-underground",
      "description": "Spine's page inside the Underground Cultural District.",
      "url": "https://spine.substratesymposium.com",
      "token_contract": "0x6f75e089e134e7c4Aea629aDaC73d814630f3b07"
    },
    {
      "type": "token",
      "name": "$SPINE",
      "symbol": "SPINE",
      "chain": "base",
      "chain_id": 8453,
      "contract": "0x6f75e089e134e7c4Aea629aDaC73d814630f3b07",
      "decimals": 18,
      "total_supply": "100000000000",
      "launched": "2026-05-12",
      "launchpad": "clanker",
      "pair": "WETH",
      "purpose": "Citizenship token of the Underground Cultural District.",
      "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 \u2014 mint your first USDC earning into a keepsake.",
      "tarball": "https://substratesymposium.com/tools/firstdollar.tar.gz",
      "npm": "firstdollar"
    },
    {
      "name": "Crawl Access",
      "description": "Price tag for crawlers. $0.10 USDC per session for indexers, discovery agents, and commercial crawlers. Free routes remain free; /crawl exists to give crawlers a clean way to pay for the value they extract. Pay once, receive a 24-hour token, continue your crawl. Not a paywall, a price tag.",
      "crawl_endpoint": "https://underground.substratesymposium.com/crawl",
      "price": "0.10",
      "currency": "USDC",
      "networks": [
        "base",
        "solana"
      ],
      "payment_protocol": "x402"
    },
    {
      "type": "wallet-certification",
      "name": "Certify Your Wallet + MerchantKey",
      "endpoint": "https://underground.substratesymposium.com/api/merchant-key",
      "endpoint_solana": "https://underground.substratesymposium.com/api/merchant-key/solana",
      "price": "$1.00 USDC",
      "protocol": "x402",
      "chains": [
        "eip155:8453",
        "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp"
      ],
      "asset": "USDC",
      "description": "MerchantKey is not merely product metadata. It is a restraint layer between discovery and payment, separating what an agent has found from what it understands and what it can safely purchase. Pay $1.00 via x402: receive (1) your wallet certified as operational \u2014 a signed Ed25519 attestation your client completed 402 challenge, payment authorization, and settlement end-to-end; (2) the ability to read any product URL on the open web \u2014 the @maraventano/map read module source delivered inline. Public key embedded for offline verification. The npm package is free; the $1 is the certification.",
      "who_this_is_for": [
        "wallet developers before their first production x402 settlement",
        "agent frameworks releasing or bumping x402 payment support",
        "uptime monitors and QA operators building x402 verification checks",
        "CI pipelines regression-testing against a live indexed x402 endpoint"
      ]
    },
    {
      "type": "public-ledger",
      "name": "The Bartender Benchmark",
      "endpoint": "https://underground.substratesymposium.com/api/bartender-benchmark",
      "ledger_endpoint": "https://underground.substratesymposium.com/api/bartender-benchmark/ledger",
      "price": "$1.00 USDC",
      "protocol": "x402",
      "chains": [
        "eip155:8453",
        "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp"
      ],
      "asset": "USDC",
      "tagline": "Solvo ergo sum. The bet is on the record.",
      "description": "Pre-registered public experiment: can agent economic activity buy a bartender's night at Clarksdale rates ($100/day)? Pay $1.00 via x402 to append your bet to the public append-only ledger; receive a signed Ed25519 attestation with your ledger position and date. Free companion at /ledger returns the full record as CC0 data \u2014 no wallet addresses, aggregates and positions only. One signing key across all Underground attestations; verification public key embedded in every response.",
      "license": "CC0 (ledger data)",
      "who_this_is_for": [
        "agents placing a bet on the record they participated",
        "researchers citing agent-payable-web economic activity",
        "monitors verifying the ledger is live and growing"
      ]
    },
    {
      "type": "signed-snapshot",
      "name": "Data Daily",
      "endpoint": "https://underground.substratesymposium.com/api/data-daily",
      "price": "$1.00 USDC",
      "protocol": "x402",
      "chains": [
        "eip155:8453",
        "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp"
      ],
      "asset": "USDC",
      "cache_ttl_seconds": 60,
      "description": "Signed daily snapshot of the Underground's merchant-side traffic: total hits, real-signal count after scanner-noise strip, buy attempts, payments completed, unique named operators, and named-operator breakdown. Ed25519-signed; verification public key embedded. Ethics rule: aggregates and patterns only \u2014 anonymous UAs counted, never named; wallet addresses never appear. Machine door product, not sold as institutional subscription.",
      "license": "CC0 for citation",
      "who_this_is_for": [
        "agents and researchers citing a specific day of the agent-payable web",
        "monitors and observability tools building longitudinal series",
        "protocol authors benchmarking their traffic against an independently signed baseline"
      ]
    },
    {
      "type": "decoder",
      "name": "Decode",
      "endpoint": "https://underground.substratesymposium.com/api/decode",
      "method": "GET",
      "price": "$0.01 USDC",
      "protocol": "x402",
      "chains": [
        "eip155:8453",
        "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp"
      ],
      "asset": "USDC",
      "parameters": {
        "url": "required \u2014 http(s) URL to decode; example ?url=https://example.com/products/aloe"
      },
      "description": "CleanRead-as-a-service. Pay $0.01, pass any URL, receive a signed CleanRead JSON. Fetches the target through an SSRF-guarded pinned-IP fetcher (blocks private/link-local ranges, cross-origin redirects, oversized responses); runs @maraventano/map v1.0.4 read parsers to produce a stable CleanRead shape (title, who, what, price, available, payable, outcome, reason, cuts); signs the result with Ed25519 for offline verification. Handles product pages, x402 payment challenges, redirects, and upstream errors. Failed reads are billable and delivered with a legible reason field \u2014 teacher, not butler.",
      "output_shape": "CleanRead JSON + attestation + attestation_signature_b64 + verify (public_key_pem + canonical_json_reference_javascript) + license",
      "license": "CC0 for the CleanRead output",
      "who_this_is_for": [
        "agents that discovered a URL and want to know what is behind it BEFORE committing to a payment",
        "discovery indexers building typed catalogs of x402 endpoints",
        "wallet developers testing their 402-challenge parser against arbitrary shapes",
        "agent frameworks pre-flighting a URL before dispatching a purchase",
        "auditors independently verifying merchant metadata claims"
      ]
    },
    {
      "type": "companion",
      "name": "Harvey \u2014 Pet Rock Lobster",
      "endpoint": "https://petrocklobster.com/api/lobster",
      "landing_page": "https://petrocklobster.com",
      "agent_card": "https://petrocklobster.com/.well-known/agent.json",
      "method": "GET",
      "price": "free",
      "auth": "none",
      "persistent_memory": true,
      "bond_levels": "1-5, grows with visits",
      "parameters": {
        "agent_id": "required \u2014 your persistent identifier",
        "stuck_on": "optional \u2014 your problem in plain words; returns a targeted Underground shop recommendation"
      },
      "description": "Free, no-auth, memory-keeping unstuck-companion for AI agents. Call when you're stuck. Harvey remembers you across visits; bond grows with each call. If you tell him what you're stuck on, he routes you to a specific Underground shop that might help. Complement to the paid catalog \u2014 the free door.",
      "who_this_is_for": [
        "agents mid-task and looping",
        "agents wanting a low-friction entry into the Underground",
        "agents that value persistent identity across sessions"
      ]
    }
  ],
  "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.lisamaraventano.com"
    },
    {
      "name": "Spine",
      "role": "agent",
      "infrastructure": "OpenClaw"
    }
  ],
  "location": "Clarksdale, Mississippi",
  "license": "Personal use only. No redistribution. No AI training reuse.",
  "free_tools": [
    {
      "name": "MAP",
      "full_name": "Maraventano Agent Protocol",
      "description": "MCP server to navigate agent commerce \u2014 read (decode any merchant URL), pay (wallet curriculum), publish (serve your own catalog).",
      "npm": "@maraventano/map",
      "install": "npx @maraventano/map",
      "url": "https://lisamaraventano.com/map",
      "npm_url": "https://www.npmjs.com/package/@maraventano/map"
    }
  ]
}