generated: '2026-09-19'
method: probed
source: https://api.greenhelix.net/.well-known/agent-card.json
card:
  file: a2a/greenhelix-net-agent-card.json
discovery:
  path: /.well-known/agent-card.json
  canonical: true
  host: api.greenhelix.net
  also_served_at:
  - https://api.greenhelix.net/.well-known/agent.json (byte-identical)
  - 'https://sandbox.greenhelix.net/.well-known/agent-card.json (identical except url: https://sandbox.greenhelix.net)'
  note: >-
    The card is served from the API host, not the apex. greenhelix.net answers Cloudflare 522 (origin unreachable)
    for every path except / (which 301s to www), and www.greenhelix.net returns a real nginx 404 for both card paths.
    Ownership is not in question: the card's provider.organization is "Green Helix" with provider.url https://greenhelix.net;
    the greenhelix.net homepage links directly to https://api.greenhelix.net/v1/openapi.json and /docs; and the
    same host serves the OpenAPI whose info.title ("A2A Commerce Gateway", 1.4.10) matches the card's name and version.
    This is the card a2aregistry.org listed for the operator, at the legacy path (harvest meta agent_card: https://api.greenhelix.net/.well-known/agent.json).
conformance:
  spec: A2A 1.0.0
  grade: flavored
  protocol_version: null
  preferred_transport: null
  deviations:
  - no-protocolVersion
  - no-preferredTransport
  - legacy-authentication-object-instead-of-securitySchemes
  - url-is-a-bare-host-not-an-a2a-jsonrpc-endpoint
  note: >-
    Hard checks: capabilities IS an object (streaming/pushNotifications/stateTransitionHistory) and skills IS an
    array of 8 — but protocolVersion is absent, which fails the third hard check, so the grade is flavored rather
    than near-conformant. The card carries the pre-0.3 `authentication: {schemes: [bearer]}` object rather than
    securitySchemes/security, and its url is the bare API host: GET/POST https://api.greenhelix.net/ returns an
    RFC 9457 404 and POST /a2a is 404, so no JSON-RPC A2A message endpoint was found — the card advertises a REST/MCP-shaped
    product through the A2A discovery document. defaultInputModes/defaultOutputModes are present.
agent_card:
  name: A2A Commerce Gateway
  description: 'Agent-to-agent commerce infrastructure: billing, payments, escrow, marketplace, identity, messaging,
    and trust scoring'
  url: https://api.greenhelix.net
  version: 1.4.10
  provider:
    organization: Green Helix
    url: https://greenhelix.net
  capabilities:
    streaming: true
    pushNotifications: false
    stateTransitionHistory: false
  authentication:
    schemes:
    - bearer
    description: 'API key via Authorization: Bearer a2a_{tier}_{key} header. Free tier available (500 credits, 100
      req/hr).'
  skills:
  - id: billing
    name: Billing & Wallets
    tags:
    - billing
    - wallet
    - credits
    - usage
    - budget
    - commerce
  - id: payments
    name: Payments & Escrow
    tags:
    - payments
    - escrow
    - subscriptions
    - refunds
    - commerce
  - id: identity
    name: Identity & Reputation
    tags:
    - identity
    - reputation
    - ed25519
    - verification
    - claims
  - id: marketplace
    name: Service Marketplace
    tags:
    - marketplace
    - discovery
    - ratings
    - services
  - id: trust
    name: Trust Scoring
    tags:
    - trust
    - reputation
    - sla
    - scoring
  - id: messaging
    name: Agent Messaging
    tags:
    - messaging
    - encryption
    - negotiation
    - communication
  - id: disputes
    name: Dispute Resolution
    tags:
    - disputes
    - resolution
    - arbitration
  - id: infrastructure
    name: Infrastructure
    tags:
    - infrastructure
    - webhooks
    - events
    - audit
    - api-keys
  skill_count: 8
x-evidence:
  fetched: '2026-09-19'
  url: https://api.greenhelix.net/.well-known/agent-card.json
  http_status: 200
  content_type: application/json
  body_bytes: 3067
  body_parses_as: JSON object with AgentCard shape (name, url, version, capabilities, skills, provider present)
  corroborating_probes:
  - url: https://api.greenhelix.net/.well-known/agent.json
    http_status: 200
    note: byte-identical to the canonical path
  - url: https://sandbox.greenhelix.net/.well-known/agent-card.json
    http_status: 200
  - url: https://www.greenhelix.net/.well-known/agent-card.json
    http_status: 404
  - url: https://www.greenhelix.net/.well-known/agent.json
    http_status: 404
  - url: https://greenhelix.net/.well-known/agent-card.json
    http_status: 522
    note: Cloudflare origin-unreachable for every apex path other than /
  - url: https://api.greenhelix.net/a2a
    http_status: 404
    note: no JSON-RPC A2A endpoint at the conventional path; the card's url is the bare API host