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Natural speech, instantly - English (6 voices) and Korean. Kokoro + MeloTTS engines; wav or mp3 output; voice and speed control per request; up to 2,000 chars (Korean 1,200). Failed calls are never charged. For longer text, use Text-to-speech — narration.

Accurate transcription in seconds - 99 languages, auto-detected. Powered by Whisper. Send audio as base64 or just pass a public audio_url (wav/mp3/m4a/ogg/webm, up to 3 minutes); returns the transcript with language confidence and optional timestamps. Failed calls are never charged. For audio over 3 minutes, use Speech-to-text — long-form.

Transcribe long-form audio - podcasts, meetings, lectures up to 2 hours. Submit a public audio_url, get a jobId instantly, poll /paid/jobs/{jobId} for the transcript (free). Usage-based billing: $0.003 per minute of audio, authorized up front at a $0.36 ceiling and settled at the measured length. Failed jobs are never charged. For clips under 3 minutes, Speech-to-text — clips is instant and fixed-price.

Narrate long-form text - articles, newsletters, audiobook chapters up to 50,000 characters, English (6 voices) and Korean. Submit text, get a jobId instantly, poll /paid/jobs/{jobId} and download the mp3 from its audioUrl (free). Usage-based billing: $0.003 per minute of generated audio, authorized at a $0.36 ceiling and settled at the measured length. Failed jobs are never charged. For short snippets under 2,000 chars, Text-to-speech — short returns audio instantly.