> ## Documentation Index
> Fetch the complete documentation index at: https://docs.zelinqa.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Check service availability

> Return the availability and public version of NBQ Engine.



## OpenAPI

````yaml /openapi.yaml get /v1/health
openapi: 3.1.0
info:
  version: 1.0.0
  contact:
    name: Zelinqa
    url: https://docs.zelinqa.ai
  license:
    name: Proprietary — Zelinqa SAS
    identifier: LicenseRef-Zelinqa-Proprietary
  x-contract-status: frozen
  x-jira: NBQ-304
  x-supersedes: openapi/nbq-runtime-v2.openapi.yaml
  x-compatibility-note: docs/api-compat-0.9-to-v1.md
  title: NBQ Engine — API V1
  summary: Public runtime and question-bank configuration contract.
  description: >-
    NBQ Engine's public V1 contract, served from https://api.zelinqa.ai. The
    server resolves the tenant, NBQ instance, and scopes from the API key. Never
    send trusted identity headers from the client. Mutations use
    Idempotency-Key, and existing-session mutations also use state_version.
servers:
  - url: https://api.zelinqa.ai
security:
  - ApiKeyAuth: []
tags:
  - name: sessions
    description: Create, advance, inspect, and close server-side NBQ conversations.
  - name: configuration
    description: Read, edit, audit, compile, and publish a question-bank configuration.
paths:
  /v1/health:
    get:
      tags:
        - legacy
      summary: Check service availability
      description: Return the availability and public version of NBQ Engine.
      operationId: health
      responses:
        '200':
          content:
            application/json:
              schema:
                type: object
                additionalProperties:
                  type: string
          description: Successful response.
      security: []
components:
  securitySchemes:
    ApiKeyAuth:
      type: http
      scheme: bearer
      bearerFormat: NBQ API key

````