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OpenAPI Specification
openapi: 3.2.0
info:
title: Human Browser Account API
version: 1.1.0
description: 'Human Browser: a cloud browser agent for AI agents. Send a natural-language goal; a real Chromium on a residential IP runs it and returns the answer plus a live viewer URL. This spec covers the public account endpoints on humanbrowser.cloud and the A2A JSON-RPC endpoint on agent.humanbrowser.cloud (per-operation servers). Agent-oriented guide: https://humanbrowser.cloud/llms-full.txt. Agent card: https://agent.humanbrowser.cloud/.well-known/agent-card.json.'
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: Account API
- url: https://agent.humanbrowser.cloud
description: A2A + MCP + sessions (Bearer token)
security:
- bearerAuth: []
tags:
- name: Account
description: Token, balance and top-ups
paths:
/api/trial-balance:
post:
tags:
- Account
operationId: claimTrial
summary: Sign up by email (magic sign-in link)
description: 'Email-gated sign-up. Sends a one-time sign-in link to /account. No free credit: new accounts start at $0 balance; the first top-up can be $1 (one real task), later top-ups from $5.'
security: []
parameters:
- $ref: '#/components/parameters/ApiVersion'
requestBody:
required: true
content:
application/json:
schema:
type: object
required:
- email
properties:
email:
type: string
format: email
responses:
'200':
description: Sign-in link emailed
content:
application/json:
schema:
type: object
properties:
ok:
type: boolean
mode:
type: string
example: magic-link
email:
type: string
'400':
$ref: '#/components/responses/BadRequest'
'429':
$ref: '#/components/responses/RateLimited'
'500':
$ref: '#/components/responses/ServerError'
/api/account:
get:
tags:
- Account
operationId: getAccount
summary: 'Get the signed-in account: token, balance, session count'
security:
- sessionCookie: []
parameters:
- $ref: '#/components/parameters/ApiVersion'
responses:
'200':
description: Account record
content:
application/json:
schema:
type: object
properties:
token:
type: string
balance_usd:
type: number
spent_usd:
type: number
session_count:
type: integer
'401':
$ref: '#/components/responses/Unauthorized'
'500':
$ref: '#/components/responses/ServerError'
/api/topup:
post:
tags:
- Account
operationId: topUp
summary: Create a Stripe or crypto top-up for prepaid balance
security:
- bearerAuth: []
parameters:
- $ref: '#/components/parameters/ApiVersion'
requestBody:
required: true
content:
application/json:
schema:
type: object
required:
- amount_usd
properties:
amount_usd:
type: number
minimum: 1
method:
type: string
enum:
- stripe
- crypto
responses:
'200':
description: Checkout URL
content:
application/json:
schema:
type: object
properties:
url:
type: string
format: uri
'400':
$ref: '#/components/responses/BadRequest'
'401':
$ref: '#/components/responses/Unauthorized'
'500':
$ref: '#/components/responses/ServerError'
/api/plans:
get:
tags:
- Account
operationId: getPlans
summary: List pay-as-you-go rates and top-up options
security: []
responses:
'200':
description: Pricing
content:
application/json: {}
'500':
$ref: '#/components/responses/ServerError'
/api/usage:
get:
tags:
- Account
operationId: getUsage
summary: Recent usage for the authenticated token
security:
- bearerAuth: []
responses:
'200':
description: Usage rows
content:
application/json: {}
'401':
$ref: '#/components/responses/Unauthorized'
/api/balance:
get:
tags:
- Account
operationId: getBalance
servers:
- url: https://agent.humanbrowser.cloud
summary: Balance of the token in the Authorization header
security:
- bearerAuth: []
responses:
'200':
description: Balance
content:
application/json:
schema:
type: object
properties:
balance_usd:
type: number
'401':
$ref: '#/components/responses/Unauthorized'
components:
parameters:
ApiVersion:
name: X-API-Version
in: header
required: false
description: Pin the API version (date-based). Defaults to the latest stable.
schema:
type: string
default: '2026-08-01'
responses:
ServerError:
description: Unexpected server error
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
Unauthorized:
description: Missing or invalid credentials
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
RateLimited:
description: Too many requests
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
BadRequest:
description: Invalid request
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
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.
securitySchemes:
bearerAuth:
type: http
scheme: bearer
description: 'API token hb_live_<owner>_<32 hex> from https://humanbrowser.cloud/account. Send as Authorization: Bearer <token>; never in a URL.'
sessionCookie:
type: apiKey
in: cookie
name: hb_session
description: Login session cookie for account endpoints.
oauth2:
type: oauth2
description: OAuth 2.1 for the MCP endpoint (https://agent.humanbrowser.cloud/mcp). The issued access token is the account's hb_live token, so it also works as bearerAuth.
flows:
authorizationCode:
authorizationUrl: https://agent.humanbrowser.cloud/authorize
tokenUrl: https://agent.humanbrowser.cloud/token
refreshUrl: https://agent.humanbrowser.cloud/token
scopes:
mcp:run: Start and drive browser tasks
mcp:read: Read task status
externalDocs:
description: LLM-friendly reference
url: https://humanbrowser.cloud/llms-full.txt
x-provenance:
method: harvested
publisher: Virix Labs
source: https://humanbrowser.cloud/openapi.json
note: split by refine-openapis from the provider's own published document, verified by fetch (openapi/_original/*.fetch.json);
stamped by stamp-openapi-provenance.py (roadmap#793)