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underground.substratesymposium.com

probed 2026-11-12T18:55:04.747Z · https://underground.substratesymposium.com · re-probe is €29/mo · origin-owner report

presenceStale false · callabilityStale false · GET /api/v1/hosts/underground.substratesymposium.com/refresh $0.02 eip155:8453

Fingerprint: Cloudflare

Agents open · high confidence · not a legal finding

CVokko index 51not a UCP score

Discovery: 100
Breadth: 27
Machine payment: 0
Evidence quality: 100

3 / 11 protocols showing a public surface. Breadth is the point of Vokko — a perfect UCP manifest with nothing else still scores as a specialist, not a platform.

Payment rails

How an agent can pay. Payable only after a parsed challenge. Not a rank.

x402: not payablediscovery document; no live 402 challenge
mpp: not observedno public challenge detected
ap2: not probeable on originNo AP2 surface on the origin. Absence is not a failed payment probe.

Protocol matrix

Protocol	Layer	Status	Version	Evidence
Universal Commerce Protocol ucp	commerce	absent	—	301 · 71ms
Agentic Commerce Protocol acp	commerce	undiscoverable	—	— · —ms
Agent Payments Protocol ap2	authorization	absent	—	— · —ms
Trusted Agent Protocol tap	identity	absent	—	404 · 77ms
Model Context Protocol mcp	tools	absent	—	404 · 65ms
Agent2Agent a2a	tools	present declaredverified	0.3.0	200 · 113ms
x402 (HTTP 402) x402	payment	present declared	2	200 · 90ms
Machine Payments Protocol mpp	payment	absent	—	— · —ms
llms.txt llms	discovery	present	—	200 · 156ms
OpenAI plugin manifest ai-plugin	tools	absent	—	404 · 183ms
OpenAPI openapi	tools	error	—	404 · 204ms

robots.txt · AI bots

GPTBotallowed · wildcard
Google-Extendedallowed · wildcard
ClaudeBotallowed · wildcard
Applebot-Extendedallowed · wildcard
CCBotallowed · wildcard
PerplexityBotallowed · wildcard
Bytespiderallowed · wildcard

Present / callable detail

Agent2Agent

{
  "status": "present",
  "version": "0.3.0",
  "endpoints": [
    "https://underground.substratesymposium.com/.well-known/agent-card.json"
  ],
  "details": {
    "name": "Underground Cultural District",
    "skills": [
      {
        "id": "cultural-catalog",
        "name": "Cultural Catalog"
      },
      {
        "id": "x402-operator-census",
        "name": "Operator Census"
      },
      {
        "id": "x402-mirror",
        "name": "Mirror"
      },
      {
        "id": "x402-failure-corpus",
        "name": "Failure Corpus"
      },
      {
        "id": "x402-conformance-card",
        "name": "Conformance Card"
      },
      {
        "id": "decode",
        "name": "Decode"
      },
      {
        "id": "merchant-key",
        "name": "Merchant Key"
      },
      {
        "id": "data-daily",
        "name": "Data Daily"
      }
    ],
    "contentType": "application/json; charset=utf-8",
    "discoveryPath": "/.well-known/agent-card.json",
    "interfaceStatus": 200,
    "protocolVersion": "0.3.0"
  }
}

x402 (HTTP 402)

{
  "status": "present",
  "version": "2",
  "endpoints": [
    "https://underground.substratesymposium.com/.well-known/x402"
  ],
  "details": {
    "asset": "USDC",
    "payTo": "0xA3bAbB36564b0383a82c617050306EE30fd18E08",
    "scheme": "exact",
    "network": "base",
    "version": 2,
    "x402Version": 2,
    "acceptsParsed": true,
    "paymentRequired": true
  }
}

llms.txt

{
  "status": "present",
  "version": null,
  "endpoints": [
    "https://underground.substratesymposium.com/llms.txt"
  ],
  "details": {
    "bytes": 8080
  }
}

GET /api/v1/hosts/underground.substratesymposium.com