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OpenAPI Specification

openapi: 3.2.0
info:
  title: SLNG Gateway API - SLNG TTS Deepgram Aura 2 API
  version: 0.1.0
  description: Unified API for speech-to-text and text-to-speech services.
  contact:
    name: SLNG Support
    email: support@slng.ai
servers:
- url: https://api.slng.ai
  description: Production
- url: https://stageapi.slng.ai
  description: Staging
security:
- BearerAuth: []
tags:
- name: Deepgram Aura 2
  description: Deepgram Aura 2 for conversational voice agents.
paths:
  /v1/tts/slng/deepgram/aura:2-en:
    post:
      operationId: slng/deepgram/aura:2-en
      summary: Aura 2 (English)
      description: Synthesize English speech using SLNG-hosted Deepgram Aura 2.
      tags:
      - Deepgram Aura 2
      parameters:
      - $ref: '#/components/parameters/XRegionSlngAuraEn'
      - $ref: '#/components/parameters/XWorldPartSlngAuraEn'
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/SlngDeepgramAura2EnRequest'
            examples:
              basic:
                summary: Basic synthesis
                value:
                  model: aura-2-thalia-en
                  text: Hello, this is a test of text to speech synthesis.
      responses:
        '200':
          $ref: '#/components/responses/TtsSynthesisSuccess'
        '400':
          $ref: '#/components/responses/SlngDeepgramAuraBadRequest'
        '401':
          $ref: '#/components/responses/SlngDeepgramAuraUnauthorized'
        '500':
          $ref: '#/components/responses/ProviderInternalServerError'
  /v1/tts/slng/deepgram/aura:2-es:
    post:
      operationId: slng/deepgram/aura:2-es
      summary: Aura 2 (Spanish)
      description: Synthesize Spanish speech using SLNG-hosted Deepgram Aura 2.
      tags:
      - Deepgram Aura 2
      parameters:
      - $ref: '#/components/parameters/XRegionSlngAuraEs'
      - $ref: '#/components/parameters/XWorldPartSlngAuraEs'
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/SlngDeepgramAura2EsRequest'
            examples:
              basic:
                summary: Basic synthesis
                value:
                  model: aura-2-celeste-es
                  text: Hola, esto es una prueba de síntesis de texto a voz.
      responses:
        '200':
          $ref: '#/components/responses/TtsSynthesisSuccess'
        '400':
          $ref: '#/components/responses/SlngDeepgramAuraBadRequest'
        '401':
          $ref: '#/components/responses/SlngDeepgramAuraUnauthorized'
        '500':
          $ref: '#/components/responses/ProviderInternalServerError'
components:
  schemas:
    AudioBinary:
      type: string
      format: binary
      description: Binary audio data.
    SlngDeepgramAura2EnModelName:
      type: string
      description: English voice model. Check the full list with audio samples in the [voice list](https://docs.slng.ai/voices/deepgram-aura#english-voices).
      enum:
      - aura-2-amalthea-en
      - aura-2-andromeda-en
      - aura-2-apollo-en
      - aura-2-arcas-en
      - aura-2-aries-en
      - aura-2-asteria-en
      - aura-2-athena-en
      - aura-2-atlas-en
      - aura-2-aurora-en
      - aura-2-callista-en
      - aura-2-cordelia-en
      - aura-2-cora-en
      - aura-2-delia-en
      - aura-2-draco-en
      - aura-2-electra-en
      - aura-2-harmonia-en
      - aura-2-helena-en
      - aura-2-hera-en
      - aura-2-hermes-en
      - aura-2-hyperion-en
      - aura-2-iris-en
      - aura-2-janus-en
      - aura-2-juno-en
      - aura-2-jupiter-en
      - aura-2-luna-en
      - aura-2-mars-en
      - aura-2-minerva-en
      - aura-2-neptune-en
      - aura-2-odysseus-en
      - aura-2-ophelia-en
      - aura-2-orion-en
      - aura-2-orpheus-en
      - aura-2-pandora-en
      - aura-2-phoebe-en
      - aura-2-pluto-en
      - aura-2-saturn-en
      - aura-2-selene-en
      - aura-2-thalia-en
      - aura-2-theia-en
      - aura-2-vesta-en
      - aura-2-zeus-en
    SlngDeepgramAura2EsRequest:
      allOf:
      - $ref: '#/components/schemas/DeepgramAuraTtsRequestBase'
      - type: object
        properties:
          model:
            $ref: '#/components/schemas/SlngDeepgramAura2EsModelName'
        required:
        - model
    DeepgramTtsEncoding:
      type: string
      description: Output audio encoding.
      enum:
      - linear16
      - mp3
      - opus
      - flac
      - aac
      - mulaw
      - alaw
      default: mp3
    DeepgramTtsContainer:
      type: string
      description: Output file format container.
      enum:
      - none
      - wav
      - ogg
      default: wav
    SlngDeepgramAuraUnauthorizedResponse:
      type: object
      description: Unauthorized error response for SLNG-hosted Deepgram Aura TTS requests.
      properties:
        title:
          type: string
          description: Error title.
          example: Unauthorized
        status:
          type: integer
          description: HTTP status code.
          example: 401
        detail:
          type: string
          description: Detailed error message.
          example: No Authorization Header
      required:
      - title
      - status
      - detail
    SlngDeepgramAura2EnRequest:
      allOf:
      - $ref: '#/components/schemas/DeepgramAuraTtsRequestBase'
      - type: object
        properties:
          model:
            $ref: '#/components/schemas/SlngDeepgramAura2EnModelName'
        required:
        - model
    TextToSynthesize:
      type: string
      minLength: 1
      description: Text to synthesize.
    DeepgramTtsSampleRate:
      type: integer
      description: Output sample rate in Hz.
      enum:
      - 8000
      - 16000
      - 24000
      - 32000
      - 48000
      default: 24000
    SlngDeepgramAura2EsModelName:
      type: string
      description: Spanish voice model. Check the full list with audio samples in the [voice list](https://docs.slng.ai/voices/deepgram-aura#spanish-voices).
      enum:
      - aura-2-sirio-es
      - aura-2-nestor-es
      - aura-2-carina-es
      - aura-2-celeste-es
      - aura-2-alvaro-es
      - aura-2-diana-es
      - aura-2-aquila-es
      - aura-2-selena-es
      - aura-2-estrella-es
      - aura-2-javier-es
    SlngDeepgramAuraBadRequestResponse:
      type: object
      description: 'Bad request error for SLNG-hosted Deepgram Aura TTS. Validation errors include `fieldErrors`; provider errors include `details`.

        '
      properties:
        error:
          type: string
          description: Error message or category.
          example: Text is required
        fieldErrors:
          type: object
          description: Field-level validation errors keyed by field name. Present for request validation errors.
          additionalProperties:
            type: array
            items:
              type: string
          example:
            text:
            - Required
        details:
          type: string
          description: Detailed error message from the provider. Present for provider-side errors.
          example: '{"err_code":"INVALID_QUERY_PARAMETER","err_msg":"Failed to deserialize query parameters"}'
      required:
      - error
    DeepgramAuraTtsRequestBase:
      type: object
      properties:
        text:
          $ref: '#/components/schemas/TextToSynthesize'
        encoding:
          $ref: '#/components/schemas/DeepgramTtsEncoding'
        sample_rate:
          $ref: '#/components/schemas/DeepgramTtsSampleRate'
        container:
          $ref: '#/components/schemas/DeepgramTtsContainer'
        bit_rate:
          type: integer
          description: Output bit rate for lossy encodings.
          enum:
          - 8000
          - 16000
          - 24000
          - 32000
          - 48000
          - 64000
          - 96000
          - 128000
          - 192000
          - 256000
      required:
      - text
    ProviderErrorResponse:
      type: object
      description: 'Provider error response. Contains error information from the upstream provider.

        Common errors include invalid speakers, unsupported languages, or malformed requests.

        '
      properties:
        error:
          type: string
          description: Error type or category (e.g., "TTS service error", "Validation error").
          example: TTS service error
        status:
          type: number
          description: Original HTTP status code from the provider (may differ from gateway response code).
          example: 400
        details:
          type: string
          description: 'Detailed error message from the provider. For TTS errors, this typically includes

            the specific validation failure (e.g., invalid speaker ID for the selected model/language).

            '
          example: 'Rime TTS API error: 400 Bad Request - Invalid argument: Invalid speaker: aurelie'
      required:
      - error
  parameters:
    XWorldPartSlngAuraEn:
      name: X-World-Part-Override
      in: header
      required: false
      description: Target world part override. Auto-selected if not provided.
      schema:
        type: string
        enum:
        - eu
        - na
    XRegionSlngAuraEs:
      name: X-Region-Override
      in: header
      required: false
      description: Target region override. Auto-selected if not provided.
      schema:
        type: string
        enum:
        - eu-north-1
    XWorldPartSlngAuraEs:
      name: X-World-Part-Override
      in: header
      required: false
      description: Target world part override. Auto-selected if not provided.
      schema:
        type: string
        enum:
        - eu
    XRegionSlngAuraEn:
      name: X-Region-Override
      in: header
      required: false
      description: Target region override. Auto-selected if not provided.
      schema:
        type: string
        enum:
        - eu-north-1
        - us-east-1
  responses:
    ProviderInternalServerError:
      description: Internal server error from the provider.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ProviderErrorResponse'
          examples:
            processing-error:
              summary: Processing error
              value:
                error: Service error
                details: Internal processing error
    SlngDeepgramAuraBadRequest:
      description: 'Bad request for SLNG-hosted Deepgram Aura TTS. Can be a validation error (missing/invalid fields) or a provider error (invalid query parameters).

        '
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/SlngDeepgramAuraBadRequestResponse'
          examples:
            Missing required field:
              summary: Validation error — missing required field
              value:
                error: Text is required
                fieldErrors:
                  text:
                  - Required
            Invalid encoding value:
              summary: Invalid encoding value
              value:
                error: TTS service error
                details: '{"err_code":"INVALID_QUERY_PARAMETER","err_msg":"Failed to deserialize query parameters: unknown variant `sss`, expected one of `linear16`, `mulaw`, `alaw`, `mp3`, `opus`, `flac`, `aac`","request_id":"9740fb95-d205-49f4-91c5-ab2f97bb09fa"}'
            Model not found:
              summary: Model or version not found
              value:
                error: TTS service error
                details: '{"err_code":"Bad Request","err_msg":"No such model/version combination found.","request_id":"8ccc6b44-5f96-4d21-9b4d-3011fa36b2e9"}'
    SlngDeepgramAuraUnauthorized:
      description: 'Unauthorized error for SLNG-hosted Deepgram Aura TTS. Returned when the Authorization header is missing or invalid.

        '
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/SlngDeepgramAuraUnauthorizedResponse'
          example:
            title: Unauthorized
            status: 401
            detail: No Authorization Header
    TtsSynthesisSuccess:
      description: Synthesis successful.
      content:
        audio/*:
          schema:
            $ref: '#/components/schemas/AudioBinary'
  securitySchemes:
    BearerAuth:
      type: http
      scheme: bearer
      description: 'API key issued by SLNG. Pass as `Authorization: Bearer <token>`.

        '