Podcastle Voices API
Browse the voice library and create instant voice clones.
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OpenAPI Specification
openapi: 3.2.0
info:
title: Async (Podcastle) Voice Text to Speech Voices API
description: The Async Voice API is the developer platform behind Podcastle's AI audio engine. It exposes low-latency, human-like text-to-speech, a browsable voice library, and instant voice cloning. Podcastle.ai rebranded its developer platform as Async; the API is served from https://api.async.com and authenticated with an x-api-key header plus a version header. Only documented endpoints and fields are modeled here; no endpoints are fabricated.
termsOfService: https://async.com/terms
contact:
name: Async Support
url: https://docs.async.com
version: v1
servers:
- url: https://api.async.com
description: Async Voice API production base URL
security:
- apiKey: []
tags:
- name: Voices
description: Browse the voice library and create instant voice clones.
paths:
/voices:
post:
operationId: listVoices
tags:
- Voices
summary: List voices from the voice library.
description: Returns a paginated list of predefined and custom voices. Filters by model, language, accent, gender, and style are supported, along with a cursor for pagination.
parameters:
- $ref: '#/components/parameters/Version'
requestBody:
required: false
content:
application/json:
schema:
$ref: '#/components/schemas/ListVoicesRequest'
responses:
'200':
description: A page of voices.
content:
application/json:
schema:
$ref: '#/components/schemas/ListVoicesResponse'
'401':
$ref: '#/components/responses/Error'
'404':
$ref: '#/components/responses/Error'
'429':
$ref: '#/components/responses/Error'
'500':
$ref: '#/components/responses/Error'
/voices/clone:
post:
operationId: cloneVoice
tags:
- Voices
summary: Create an instant voice clone.
description: 'Creates a production-ready custom voice from a short audio clip. Accepts multipart/form-data with the audio sample and optional metadata. Supported audio formats: wav, mp3, flac, aiff.'
parameters:
- $ref: '#/components/parameters/Version'
requestBody:
required: true
content:
multipart/form-data:
schema:
$ref: '#/components/schemas/CloneVoiceRequest'
responses:
'200':
description: The newly created cloned voice.
content:
application/json:
schema:
$ref: '#/components/schemas/CloneVoiceResponse'
'400':
$ref: '#/components/responses/Error'
'401':
$ref: '#/components/responses/Error'
'429':
$ref: '#/components/responses/Error'
'500':
$ref: '#/components/responses/Error'
components:
schemas:
ListVoicesRequest:
type: object
properties:
limit:
type: integer
description: Number of voices per page.
minimum: 1
maximum: 100
default: 10
model_id:
type: string
description: Filter by model.
language:
type: string
description: Filter by language (ISO 639-1).
accent:
type: string
description: Filter by accent.
gender:
type: string
description: Filter by gender.
enum:
- Male
- Female
- Neutral
- Unspecified
style:
type: string
description: Filter by style.
my_voice:
type: boolean
description: Return only voices owned by the current user.
after:
type: string
description: Pagination cursor for subsequent pages.
CloneVoiceResponse:
type: object
properties:
id:
type: string
name:
type: string
description:
type: string
language:
type: string
description: ISO 639-1 codes, comma-separated.
ListVoicesResponse:
type: object
properties:
voices:
type: array
items:
$ref: '#/components/schemas/VoiceSummary'
next_cursor:
type: string
description: Cursor for fetching the next page.
CloneVoiceRequest:
type: object
properties:
audio:
type: string
format: binary
description: 'Audio clip file. Supported formats: wav, mp3, flac, aiff.'
name:
type: string
description: Voice name or label.
description:
type: string
description: Voice description.
accent:
type: string
description: Accent specification.
gender:
type: string
description: Voice gender.
enum:
- Male
- Female
- Neutral
- Unspecified
style:
type: string
description: Voice style(s), comma-separated.
enhance:
type: boolean
description: Apply noise reduction to the sample.
default: false
required:
- audio
- name
VoiceSummary:
type: object
properties:
voice_id:
type: string
voice_type:
type: string
enum:
- PREDEFINED
- CUSTOM
name:
type: string
description:
type: string
language:
type: string
gender:
type: string
accent:
type: string
style:
type: string
created_at:
type: string
updated_at:
type: string
Error:
type: object
properties:
detail:
type: object
properties:
error_code:
type: string
message:
type: string
extra:
type: object
parameters:
Version:
name: version
in: header
required: true
description: API version, for example v1.
schema:
type: string
example: v1
responses:
Error:
description: Error response.
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
securitySchemes:
apiKey:
type: apiKey
in: header
name: x-api-key
description: API key issued from the Async developer console.