Text to Speech

Voice Cloning

Lip Sync Video

Other

Text to Speech — HTTP v2

Synthesize speech over HTTP with voice ID and optional engine controls.

Text to Speech (HTTP v2)

POST /api/open/v2/speech/tts. Send a JSON body with your text, voice ID, and optional engine and synthesis options. Authenticate with Authorization: Bearer, or pass the token in the JSON body.

Endpoint

POST /api/open/v2/speech/tts

Request Headers

Content-Type
stringheaderrequired
application/json
Authorization
stringheaderrequired
Bearer <token> (API Key)

Request Parameters

application/json
voiceId
stringrequired
Voice ID.
modelId
stringoptional
Engine model ID.
Available options:fishaudio-s2profishaudio-s1minimax-2.8-turbominimax-2.8-hdminimax-2.6-turbominimax-2.6-hdqwen3-tts-flash
text
stringrequired
Text to synthesize.
format
stringoptionaldefault: mp3
Output audio format.
Available options:mp3wavogg
speed
numberoptionaldefault: 1
Speech speed multiplier (0.5–2.0).
volume
numberoptionaldefault: 0
Output volume (-20..20).
stability
numberoptional
Stability / expressiveness (0.5–1.5; Fish Audio engines only).
similarity
numberoptional
Similarity (0.5–1.5; Fish Audio engines only).
pitch
numberoptional
Pitch in semitones (-12–12; Minimax/Qwen engines only).
language
stringoptional
Language hint / overlay.
emotion
stringoptional
Speaking emotion (Minimax engine only).
Available options:happysadangryfearfuldisgustedsurprisedcalm
token
string // Optional if Authorization: Bearer is set
API token (optional when Authorization header is present).

Response Data

// Success Response - 200
Content-Type: audio/mpeg (or audio/wav / audio/ogg depending on format)
<Binary audio data>

// Responses may include headers with remaining balance and usage for this request.

// Error Response
{
  "code": string,
  "message": string,
  "requestId"?: string
}

CURL Example

curl -X POST https://kittaai.com/api/open/v2/speech/tts \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_TOKEN" \
  -d '{
    "voiceId": "00a1b221-6137-4b73-ad62-b0cbce134167",
    "modelId": "fishaudio-s2pro",
    "text": "Hello, world.",
    "format": "wav",
    "speed": 1,
    "volume": 0
  }' \
  --output output.wav

Online Debug

Status Code Description

Status Code Description:
200 OK                  - Request successful
400 Bad Request         - Invalid request parameters
401 Unauthorized        - Invalid API Token
403 Forbidden          - Access forbidden
404 Not Found          - Resource not found
413 Payload Too Large  - Upload file too large
429 Too Many Requests  - Rate limit exceeded/Insufficient credits
500 Server Error       - Internal server error

Error Response Format:
{
  "error": string,      // Error message
  "details": string,    // Detailed error message (optional)
  "code": string       // Error code (optional)
}