TonePerfect (Pronunciation Assessment API) Utilities API

openapi: 3.2.0
info:
  title: TonePerfect Pronunciation Assessment Utilities 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: Utilities
paths:
  /v1/lint:
    post:
      tags:
      - Utilities
      operationId: lintReference
      summary: Check a reference text before recording
      description: Applies the engine’s reference rules (script, digits, length, Mandarin pinyin parsing and character count) without audio. Free; no API key; 120 requests per minute per IP address. A text that passes can still be refused by a newer engine.
      security: []
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
              - text
              properties:
                text:
                  type: string
                language:
                  type: string
                  enum:
                  - zh-CN
                  - en-US
                  - fr-FR
                  - es-419
                  - de-DE
                  - it-IT
                  - pt-BR
                  - ru-RU
                  - ko-KR
                  - ja-JP
                  default: zh-CN
                pinyin:
                  type: string
                task:
                  type: string
                  enum:
                  - general
                  - connected_speech
                  - isolated_word
                  default: general
      responses:
        '200':
          description: Lint result. `ok` is false when at least one issue has severity `error`.
          content:
            application/json:
              schema:
                type: object
                required:
                - ok
                - language
                - issues
                - units
                properties:
                  ok:
                    type: boolean
                  language:
                    type: string
                  units:
                    type: integer
                    description: Characters (Mandarin) or words counted.
                  issues:
                    type: array
                    items:
                      type: object
                      required:
                      - code
                      - message
                      - severity
                      properties:
                        code:
                          type: string
                        message:
                          type: string
                        field:
                          type: string
                          enum:
                          - text
                          - pinyin
                        severity:
                          type: string
                          enum:
                          - error
                          - warning
        '415':
          description: Send JSON.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '422':
          description: Body is not an object of string fields.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
  /v1/status:
    get:
      tags:
      - Utilities
      operationId: getStatus
      summary: Synthetic probe status
      description: 'Outcome of the gateway’s synthetic engine check: one machine-speech clip scored through the /v1/assess engine path every few minutes, without an account or credits. A pass means a well-formed scored result came back; it does not measure accuracy. Free; no API key.'
      security: []
      responses:
        '200':
          description: Probe summary. Checks that find the engine busy with customer work are skipped (counted in `last_24h.busy_skipped`); three in a row read as `degraded` with a `reason`.
          content:
            application/json:
              schema:
                type: object
                required:
                - status
                - generated_at
                - probe
                - last_check
                - consecutive_failures
                - last_24h
                - last_7d
                properties:
                  status:
                    type: string
                    enum:
                    - operational
                    - degraded
                    - down
                    - unknown
                    - not_monitored
                  reason:
                    type:
                    - string
                    - 'null'
                  reason_code:
                    type:
                    - string
                    - 'null'
                    enum:
                    - probe_disabled
                    - consecutive_failures
                    - engine_saturated
                    - no_recent_assessment
                    - recent_failures
                    - null
                  consecutive_busy:
                    type: integer
                  generated_at:
                    type: string
                    format: date-time
                  probe:
                    type: object
                    properties:
                      enabled:
                        type: boolean
                      interval_seconds:
                        type:
                        - integer
                        - 'null'
                      what:
                        type: string
                      pass_means:
                        type: string
                  last_check:
                    type:
                    - object
                    - 'null'
                    properties:
                      checked_at:
                        type: string
                      ok:
                        type: boolean
                      http_status:
                        type: integer
                      latency_ms:
                        type: integer
                      model_version:
                        type:
                        - string
                        - 'null'
                      error:
                        type:
                        - string
                        - 'null'
                  consecutive_failures:
                    type: integer
                  last_24h:
                    $ref: '#/components/schemas/StatusWindow'
                  last_7d:
                    $ref: '#/components/schemas/StatusWindow'
  /v1/terms:
    get:
      tags:
      - Utilities
      operationId: getTerms
      summary: Supported commercial terms
      description: Plans, credits, limits per plan, what happens to credits after a plan ends, and the invoice shapes billing supports, generated from the code that enforces them. Free; no API key.
      security: []
      responses:
        '200':
          description: Commercial terms (`version` dated).
          content:
            application/json:
              schema:
                type: object
                additionalProperties: true
components:
  schemas:
    StatusWindow:
      type: object
      properties:
        checks:
          type: integer
        ok:
          type: integer
        success_rate:
          type:
          - number
          - 'null'
        p50_latency_ms:
          type:
          - integer
          - 'null'
        p90_latency_ms:
          type:
          - integer
          - 'null'
        busy_skipped:
          type: integer
          description: last_24h only
    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