Speech Synthesis - API Reference

API Documentation

API Reference

Audio

Speech Synthesis

Supported Model Code

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Speech synthesis

https://api.modelstream.ai

POST/v1/audio/speech

Authentication

BearerAuth

AuthenticationBearer <token>

All API requests must be authenticated using a Bearer token in the Authorization header. Please ensure your API key is active.Authorization: Bearer sk-xxxxxx

Parameter Location: Header Param

Request Body

application/json

Due to parameter differences across provider models, we recommend referring to the complete form parameter instructions during the specific model trial. The form view intuitively shows parameter types, and the JSON view reveals the exact parameters requested.

model*string

Model ID used

Required

input*string

Input data or text to process

Required

voice*string

Voice used for audio synthesis

Required

Enum/Options:

"alloy""echo""fable""onyx""nova""shimmer"

response_format?string

Response Data Format

Example Value: mp3

Enum/Options:

"mp3""opus""aac""flac""wav""pcm"

speed?number

Playback speed multiplier

Example Value: 1Value Range: 0.25 ≤ value ≤ 4

Response Parameters

application/json

200apiDocs.responses.successGenerateAudio

curl -X POST "https://api.modelstream.ai/v1/audio/speech" \
  -H "Authorization: Bearer <token>" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "tts-1",
  "input": "string",
  "voice": "string",
  "response_format": "string",
  "speed": 0
}'

"string"