TonePerfect (Pronunciation Assessment API) Capabilities API

openapi: 3.2.0
info:
  title: TonePerfect Pronunciation Assessment Capabilities API
  version: 0.1.0
  summary: 'Score a short recording against its reference text: sentence, word and sound grades, with Mandarin initial, final and tone per syllable.'
  description: Send a recording (WAV, MP3, M4A, Ogg or WebM, 0.15–30 s, up to 10 MB) and the text it should contain.
  contact:
    name: TonePerfect
    email: nik@toneperfect.app
    url: https://api.toneperfect.app/
servers:
- url: https://api.toneperfect.app
  description: Production. Requests pass a proxy with a 26-second timeout.
tags:
- name: Capabilities
paths:
  /v1/capabilities:
    get:
      tags:
      - Capabilities
      operationId: getCapabilities
      summary: Installed languages, dimensions and limits
      description: No API key required.
      security: []
      responses:
        '200':
          description: Current capabilities.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Capabilities'
        '503':
          description: The pronunciation engine is unreachable (`engine_unavailable`).
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
components:
  schemas:
    Capabilities:
      type: object
      properties:
        model_version:
          type: string
        languages:
          type: array
          items:
            type: object
            required:
            - locale
            - available
            properties:
              locale:
                type: string
              name:
                type: string
              language:
                type: string
              available:
                type: boolean
              status:
                type: string
                examples:
                - experimental
              model_version:
                type: string
              dimensions:
                type: array
                items:
                  type: string
              tasks:
                type: array
                items:
                  type: string
              correction_level:
                type: string
              limitations:
                type: array
                items:
                  type: string
              unsupported_dimensions:
                type: array
                items:
                  type: string
              notes:
                type:
                - string
                - array
              max_words:
                type: integer
              max_duration_seconds:
                type: number
            additionalProperties: true
        limits:
          type: object
          properties:
            max_audio_seconds:
              type: integer
              examples:
              - 30
            max_upload_bytes:
              type: integer
              examples:
              - 10485760
            concurrent_requests_per_account:
              type: integer
              examples:
              - 2
      additionalProperties: true
    Error:
      type: object
      required:
      - error
      properties:
        error:
          type: object
          required:
          - code
          - message
          properties:
            code:
              type: string
              enum:
              - invalid_multipart
              - invalid_api_key
              - subscription_required
              - insufficient_credits
              - payment_balance_due
              - upload_timeout
              - idempotency_conflict
              - request_pending
              - idempotency_expired
              - upload_too_large
              - invalid_idempotency_key
              - missing_audio
              - invalid_reference
              - invalid_task
              - invalid_test_outcome
              - invalid_input
              - unsupported_language
              - invalid_audio
              - invalid_assessment
              - rate_limit
              - account_busy
              - free_capacity
              - gateway_busy
              - decoder_busy
              - audio_decoder_unavailable
              - engine_unavailable
              - request_interrupted
              description: Stable machine-readable code. Branch on this, not on the message.
            message:
              type: string
          additionalProperties: true
        request_id:
          type: string
          description: Present on errors raised before an assessment was stored.
        id:
          type: string
          description: Present on finalized failures (stored under the Idempotency-Key).
        billing:
          $ref: '#/components/schemas/Billing'
    Billing:
      type: object
      required:
      - credits
      - balance_credits
      properties:
        credits:
          type: integer
          minimum: 0
          description: Credits charged by this request (0 when failed or unassessable).
        balance_credits:
          type: integer
          description: Remaining plan balance.
        free_credits:
          type: integer
          description: Remaining free trial credits (every account starts with 50).
        source:
          type: string
          enum:
          - free
          - plan
          description: Which balance paid for this request. Free credits are spent first.
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      description: Secret API key (`tp_live_…`) from the dashboard. Keep it on your server. A test key (`tp_test_…`) returns fixed example results and is safe to publish.
    apiKeyHeader:
      type: apiKey
      in: header
      name: X-Api-Key
      description: Alternative to the Authorization header.
externalDocs:
  description: API reference
  url: https://api.toneperfect.app/docs