Text-to-Speech (TTS)

Convert text to speech audio. Billing: charged per character count (punctuation included). The response is a binary audio stream; Content-Type varies with response_format.

The request body includes model (e.g. seed-tts-2.0), input (text to synthesize), voice (voice ID), plus optional speed (speaking rate), response_format (output format), and instructions (voice instructions, not billed).

For native Volcengine parameters (ssml, explicit_language, aigc_watermark, etc.), use the native passthrough endpoint POST /v1/audio/speech/unidirectional instead.

Authorization: Bearer tr-xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

curl -X post "https://api.xrtoken.ai/v1/audio/speech" \  -H "Content-Type: application/json" \  -d '{    "model": "volcengine/seed-tts-2.0",    "input": "Hello, welcome to XRToken."  }'

"string"

{
  "error": "string",
  "type": "invalid_request_error"
}

{
  "error": "invalid or missing API key",
  "type": "auth_error"
}

{
  "error": "insufficient balance -- please top up or upgrade your plan",
  "type": "billing_error"
}

{
  "error": "rate limit exceeded",
  "type": "rate_limit_error"
}

{
  "error": "upstream provider error",
  "type": "server_error"
}