Bilibili IndexTTS Voice TTS API - IndexTTS-2

Synthesize WAV audio from text using a built-in voice or an uploaded custom voice. On success the response is a binary audio stream, not a JSON URL.

Base URL

https://api.autorouter.top — Production

Authentication

BearerAuth: http (bearer) Authenticate using a Bearer Token. Format: Authorization: Bearer sk-xxxxxx

Endpoints

POST `/v1/audio/speech`

Create Voice TTS Request

Pass text and a voice. The response is WAV audio.

Request Body

Content-Type: application/json

Example:

{
  "model": "IndexTeam/IndexTTS-2",
  "input": "你好！欢迎使用语音合成服务。",
  "voice": "jack_cheng"
}

Properties:

Name	Type	Required	Description
`model`	string	Yes	Model name. Fixed to `IndexTeam/IndexTTS-2`
`input`	string	Yes	Text to synthesize. Maximum 600 characters
`voice`	string	Yes	Voice. Built-in voice, custom `uspeech:...` ID, or an empty string to use the default voice

voicestring(Required)

Voice identifier. Choose one of:

Built-in voices:

jack_cheng
sales_voice
crystla_liu
stephen_chow
xiaoyueyue
mkas
entertain
novel
movie

Custom voice: ID from the Upload Voice endpoint, format uspeech:xxxx-xxxx-xxxx-xxxx.

Empty string: Uses the default voice behavior described in the docs.

Responses

200: Synthesis succeeded; WAV audio stream returned

Content-Type: audio/wav

400: Bad request / invalid parameters

Content-Type: application/json

Request Example

curl -X POST "https://api.autorouter.top/v1/audio/speech" \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer sk-xxxxxx" \
  --output speech.wav \
  -d '{
  "model": "IndexTeam/IndexTTS-2",
  "input": "你好！欢迎使用语音合成服务。",
  "voice": "jack_cheng"
}'

Response Example

<binary WAV audio stream>

Response fields:

Name	Type	Description
(body)	binary	WAV audio stream on success, `Content-Type: audio/wav`
`error.message`	string	Error description (on failure)
`error.type`	string	Error type, e.g. `invalid_request_error`
`error.code`	string	Machine-readable error code
`error.param`	string	Request ID or the name of the invalid parameter

Error Handling

HTTP 400 Parameter Errors

Scenario	Response
Missing `input` / `voice` / `model`	`{"error":{"message":"...","type":"invalid_request_error","code":"...","param":"..."}}`
`input` exceeds 600 characters	`{"error":{"message":"...","type":"invalid_request_error","code":"...","param":"input"}}`
Custom voice does not exist or was deleted	`{"error":{"code":"invalid_voice_id",...}}`

HTTP 401 / 403 Auth Errors

401 Unauthorized: API Key invalid or expired
403 Forbidden: API Key has no access to this model (check token's model allowlist)

HTTP 402 Insufficient Balance

Returns insufficient user quota. Top up at the AutoRouter console.

Voice TTS

voicestring(Required)

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