Speech-to-text Transcription - Modulate

Modulate offers five speech-to-text endpoints. Pick the one that matches your latency, language, and feature needs.

	Batch (multilingual)	Batch English VFast	Batch Multilingual VFast	Streaming	Streaming English
Use case	Transcription with rich metadata	Fast English-only transcription	Fast multilingual transcription	Real-time transcription	Low-latency English real-time transcription
Protocol	HTTP POST	HTTP POST	HTTP POST	WebSocket	WebSocket
Languages	Multilingual	English only	Multilingual	Multilingual	English only
Language declaration	✓ (optional `language` hint)	—	✓ (optional `language`, skips auto-detection)	✓ (optional `language` hint)	—
Speaker diarization	✓	—	—	✓	—
Emotion / accent detection	✓	—	—	✓	—
PII/PHI tagging	✓	—	—	✓	—
Partial transcripts during streaming	—	—	—	✓ (opt-in `partial_results`)	✓ (every ~1.5 s)

For a side-by-side comparison with the other Modulate capabilities, see Which API should I use?.

Authentication

Batch endpoints use the X-API-Key header. Streaming endpoints use an api_key query parameter at connection time. See Authentication and rate limits.

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