Synchronous

Sync Text To Speech With Timestamps

Synthesise speech and return audio with per-word alignment timestamps.

Resolves the voice preset, validates quota, then calls the versioned gRPC handler with include_durations=True. Returns a TTSAudioResponse containing base64-encoded audio and character-level start/end times in milliseconds.

Args: tts_request: TTS parameters (text, voice, model, output format, etc.). token_service: Injected token validation service. _request: Raw FastAPI Request used for rate-limiting. x_api_key: Bearer API key from the x-api-key header. version: API version extracted from the version request header. tts_service_stub: gRPC stub connected to the XCODEC synthesis server.

Returns: TTSAudioResponse: Base64-encoded audio and word-level alignment data.

Raises: NotSupportedModel: When the requested model does not support the voice. VoiceNotFound: When the voice preset cannot be resolved. UsageLimitExceeded: When the token has exhausted its quota.

post/text_to_speech/with_timestamps

Request

Base URL
https://api.async.com (the document declares no server; this is the origin it was published from)
Auth
none declared
TypeScript
https://skmtc.dev/async/apis/text-to-speech-api-service/docs/text_to_speech/with_timestamps/post.ts
A function with typed inputs. Its response is checked against the schema.

Headers

version'v1'

X-Api-Keystring

Request body

model_id'async_flash_v1.0' | 'async_flash_v1.5' | 'async_pro_v1.0'

normalizeboolean

Whether to normalize the input text. If False, the input text will be used as is.

experimental_streaming_modeboolean

Whether to stream audio in experimental mode.

experimental_stp_v2boolean

Use v2 STP prompt format (pr_speech_start/end). Only has effect when experimental_streaming_mode=True.

transcriptstring required

previous_request_idstring uuid nullable

ID returned in the X-Request-Id header of a previous TTS response. When provided, the last sentence of that request is appended AFTER the voice reference, enabling voice continuity across requests. Effective only for STP-based models (async_flash_v1.5, async_pro_v1.0). Silently falls back to the voice reference alone when the entry has expired, is missing, or belongs to a different token / voice / model / experimental_stp_v2 setting.

language'en' | 'fr' | 'it' | 'de' | 'es' | 'pt' | 'ar' | 'ru' | 'ro' | 'ja' | 'he' | 'hy' | 'tr' | 'hi' | 'zh' | 'cmn' | 'ur'

lang_detection_mode'llm' | 'fasttext'

sentence_splitter_chunk_sizeinteger nullable

Number of characters to split the transcript into chunks. None if based on sentences.

durationnumber nullable

stabilityinteger

TTS's stability.

speed_controlnumber

TTS's speed control.

Example request

{
  "transcript": "Hello, world!"
}

Response

Successful Response

audio_base64string required

Base64-encoded audio data

Changes

No recorded changes to this operation across all 1 revision of this API.