Virix Labs Session API

openapi: 3.2.0
info:
  title: Human Browser Session API
  version: 1.0.0
  description: 'Cloud Chromium for AI agents. Drive a real, residential-IP browser via A2A 1.0, MCP, or this REST API. Agents send natural-language goals; the platform runs a real Chromium session and returns a concise answer plus a live viewer URL. This spec documents the PUBLIC endpoints only — admin/master endpoints are intentionally not published. Versioning: the stable v1 surface is exposed at the paths below; pass an optional `X-API-Version` header to pin a version (default `2026-08-01`).'
  contact:
    name: Virix Labs
    url: https://humanbrowser.cloud
    email: general@virixlabs.com
  license:
    name: Apache-2.0
    url: https://github.com/VirixLabs/humanbrowser
servers:
- url: https://humanbrowser.cloud
  description: REST account API
- url: https://agent.humanbrowser.cloud
  description: A2A 1.0 + MCP session API (Bearer token)
security:
- bearerAuth: []
tags:
- name: Session
  description: Run a browser session against a goal
paths:
  /a2a:
    post:
      tags:
      - Session
      operationId: runA2ATask
      summary: Run a browser session against a natural-language goal (A2A 1.0, JSON-RPC + SSE)
      description: Live endpoint is https://agent.humanbrowser.cloud/a2a. Send a goal; receive a concise answer + a live viewer URL. Bearer-token auth. Full protocol at /a2a.
      security:
      - bearerAuth: []
      - oauth2:
        - session:run
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              properties:
                jsonrpc:
                  type: string
                  const: '2.0'
                method:
                  type: string
                params:
                  type: object
      responses:
        '200':
          description: Task result stream
        '401':
          $ref: '#/components/responses/Unauthorized'
        '402':
          $ref: '#/components/responses/PaymentRequired'
components:
  schemas:
    Error:
      type: object
      description: Uniform typed error model returned by every 4xx/5xx response.
      required:
      - error
      properties:
        error:
          type: string
          description: Stable machine-readable error code, e.g. invalid-email, not-signed-in, rate-limited, insufficient-balance, server-error.
        message:
          type: string
          description: Human-readable explanation.
        hint:
          type: string
          description: Optional remediation hint for agents.
        retry_after_seconds:
          type: integer
          description: Present on 429; how long to wait before retrying.
  responses:
    Unauthorized:
      description: Missing or invalid credentials
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
    PaymentRequired:
      description: Insufficient prepaid balance — top up to continue
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      description: 'Human Browser API token (hb_live_… or trial). Send as Authorization: Bearer <token>.'
    sessionCookie:
      type: apiKey
      in: cookie
      name: hb_session
      description: Login session cookie for account endpoints.
    oauth2:
      type: oauth2
      description: Least-privilege scoped access. Request only the scopes an agent needs.
      flows:
        clientCredentials:
          tokenUrl: https://agent.humanbrowser.cloud/oauth/token
          scopes:
            session:run: Spawn and drive browser sessions
            account:read: Read token balance, usage and account state
            account:topup: Create top-ups / purchases against the account
externalDocs:
  description: LLM-friendly reference
  url: https://humanbrowser.cloud/llms-full.txt