openapi: 3.2.0
info:
  title: A2A Commerce Gateway Events API
  version: 1.4.10
  description: 'A2A Commerce Gateway — agent-to-agent commerce infrastructure operated by Green Helix Consulting, LLC: billing and wallets, payment intents and escrow, subscriptions, Ed25519 agent identity and reputation, service marketplace, trust scoring, encrypted messaging and price negotiation, disputes, webhooks and an event bus.'
  contact:
    name: Green Helix
    url: https://greenhelix.net
    email: support@greenhelix.net
servers:
- url: https://api.greenhelix.net
  description: Production (the host that serves this document at /v1/openapi.json; named by the agent card url, ai-plugin.json api.url, AGENTS.md and both SDK READMEs)
- url: https://sandbox.greenhelix.net
  description: 'Sandbox — identical surface, databases reset on every deploy (docs.html; probed 2026-09-19: /v1/health 200, same 1.4.10 build)'
security:
- BearerAuth: []
- ApiKeyAuth: []
- X402Payment: []
tags:
- name: Events
paths:
  /v1/events/stream:
    get:
      summary: Event Stream
      description: 'Stream events via Server-Sent Events (SSE).


        Requires API key via Authorization header.

        Accepts query params:

        - event_type (optional): filter by event type

        - since_id (optional): only events after this ID

        - agent_id (optional): filter events by source agent

        Accepts headers:

        - Last-Event-ID: resume from this event ID (overrides since_id)'
      operationId: event_stream_v1_events_stream_get
      responses:
        '200':
          description: Successful Response
          content:
            application/json:
              schema: {}
      tags:
      - Events
components:
  securitySchemes:
    BearerAuth:
      type: http
      scheme: bearer
      description: API key passed as Bearer token in the Authorization header.
    ApiKeyAuth:
      type: apiKey
      in: header
      name: X-API-Key
      description: API key passed directly in the X-API-Key header (alternative to Bearer).
    X402Payment:
      type: apiKey
      in: header
      name: X-PAYMENT
      description: x402 payment proof for stateless authentication.
x-api-evangelist:
  source: https://api.greenhelix.net/v1/openapi.json
  fetched: '2026-09-19'
  http_status: 200
  bytes: 123527
  original: openapi/_original/greenhelix-net-openapi.json
  changes: servers[], info.description and info.contact added (the served document declares none); nothing else altered.