Cartesia

Ink — low-latency STT built for realtime agents.

All prices are the vendor’s public list price — 0% markup. Extra provider knobs pass through untouched via provider_params.

Model	Modes	List price	Diarization	Word timings
cartesia/ink-2	streaming	$0.00648/min	—	✓
cartesia/ink-whisper	streaming · batch	$0.00216/min	—	✓
cartesia/ink-2-turns	streaming	$0.00648/min	—	—

Provider options

Reach past the unified surface with provider_params — forwarded streaming → WebSocket query parameters; batch → form fields. Typed in the SDKs as {provider}Params interfaces (providerParams option / provider_params= kwarg).

Param	Type	Default	Applies to	What it does
turn_start_threshold	number	0.8	streaming	ink-2: confidence to open a turn
turn_eager_end_threshold	number	0.4	streaming	ink-2: early end-of-turn signal for LLM head-start
turn_end_threshold	number	0.2	streaming	ink-2: confidence to close a turn
turn_end_timeout_ms	integer	5600	streaming	ink-2: force turn end after this silence
min_volume	number	—	streaming	ink-whisper: ignore audio below this volume
max_silence_duration_secs	number	—	streaming	ink-whisper: silence tolerated before finalizing

Try it

curl -s https://api.speechrouter.ai/v1/audio/transcriptions \
  -H "Authorization: Bearer $SPEECHROUTER_API_KEY" \
  -F model=cartesia/ink-whisper \
  -F file=@audio.wav

_{Generated from the gateway catalog — the billing engine’s own source of truth.}