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OpenAPI Specification

openapi: 3.2.0
info:
  contact:
    name: Kalpa Labs
    url: https://kalpalabs.ai/
  description: 'The Kalpa Speech API turns text into natural speech (**TTS**) and continues a multi-speaker

    conversation as the next speaker (**converse**), returning generated text + 24&nbsp;kHz audio.


    **Authentication.** Every `/v1` request needs an API key, sent either as

    `Authorization: Bearer <key>` (preferred) or an `X-API-Key: <key>` header.


    **Rate limits.** Requests are metered per key. When you exceed your limit you receive

    `429 Too Many Requests` with a `Retry-After` header; every response carries `X-RateLimit-*` headers.


    **Audio.** Audio crosses the wire as base64-encoded 16-bit PCM WAV (mono, 24&nbsp;kHz).


    This document is the single source of truth for the contract — the docs reference, the studio''s

    typed client, and the SDKs are all generated from it.

    '
  license:
    name: Proprietary
  title: Kalpa Speech Meta Usage API
  version: 0.1.0
servers:
- description: Production
  url: https://api.kalpalabs.ai
- description: Local development
  url: http://localhost:8080
tags:
- description: Per-key usage and metering.
  name: Usage
paths:
  /v1/usage:
    get:
      description: Running totals (requests, input characters, audio seconds) for the calling API key.
      operationId: usage_v1_usage_get
      responses:
        '200':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/UsageSummaryResponse'
          description: Successful Response
        '401':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
          description: Missing or invalid API key.
      security:
      - ApiKeyAuth: []
      summary: Your metered usage
      tags:
      - Usage
components:
  schemas:
    ErrorResponse:
      description: The envelope returned for every 4xx/5xx.
      properties:
        error:
          $ref: '#/components/schemas/ErrorBody'
      required:
      - error
      title: ErrorResponse
      type: object
    ErrorBody:
      properties:
        message:
          title: Message
          type: string
        request_id:
          anyOf:
          - type: string
          - type: 'null'
          title: Request Id
        type:
          title: Type
          type: string
      required:
      - type
      - message
      title: ErrorBody
      type: object
    UsageSummaryResponse:
      properties:
        input_audio_seconds:
          title: Input Audio Seconds
          type: number
        input_chars:
          title: Input Chars
          type: integer
        key_id:
          title: Key Id
          type: string
        last_request_ts:
          anyOf:
          - type: number
          - type: 'null'
          title: Last Request Ts
        output_audio_seconds:
          title: Output Audio Seconds
          type: number
        requests:
          title: Requests
          type: integer
      required:
      - key_id
      - requests
      - input_chars
      - input_audio_seconds
      - output_audio_seconds
      title: UsageSummaryResponse
      type: object
  securitySchemes:
    ApiKeyAuth:
      description: 'Your Kalpa API key, sent as `Authorization: Bearer <key>` (or the `X-API-Key` header).'
      scheme: bearer
      type: http