> ## Documentation Index
> Fetch the complete documentation index at: https://docs.modulate.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Deepfake Detection

> Synthetic voice detection — deepfake detection on pre-recorded files (batch) or live audio (streaming).

Synthetic voice detection (SVD) returns per-frame deepfake scores for an audio source. Choose batch for files you already have, or streaming for live audio over WebSocket.

|                             | Batch                                                | Streaming                     |
| --------------------------- | ---------------------------------------------------- | ----------------------------- |
| **Use case**                | Deepfake detection on a file                         | Real-time deepfake detection  |
| **Protocol**                | HTTP POST                                            | WebSocket                     |
| **Audio formats**           | AAC, AIFF, FLAC, MOV, MP3, MP4, OGG, Opus, WAV, WebM | Raw PCM and container formats |
| **Synthetic voice scoring** | Per-frame                                            | Per-frame                     |

For a side-by-side comparison with the other Modulate capabilities, see [Which API should I use?](/guides/which-api).

## Authentication

Batch uses the `X-API-Key` header. Streaming uses an `api_key` query parameter at connection time. See [Authentication and rate limits](/guides/authentication).