# Modulate

**Canonical:** https://apis.io/providers/modulate/  
**Website:** https://modulate.ai/  
**APIs profiled:** 11

Modulate is a voice AI company based in Cambridge, Massachusetts, building audio-native voice intelligence for trust, safety, and conversation understanding. Its Velma-2 platform exposes a suite of REST (batch) and WebSocket (streaming) model APIs — multilingual and English speech-to-text transcription with speaker diarization, deepfake (synthetic voice) detection, emotion and accent detection, PII/PHI tagging and redaction, language detection, and music/speech and AI-music detection — alongside Velma conversation analysis (behaviors, topics, sentiment, participant roles) and the ToxMod voice-safety product for gaming and social platforms. Authentication is via an X-API-Key header (an api_key query parameter for WebSocket streams), billed per hour of audio processed. Backed by Sierra Ventures.

## Kin Score — 57.7 / 100 (strong)

Scored 2026-08-17 under rubric 0.11.0. Trend: flat (+0.0 from 57.7).

| Facet | Score |
|---|---|
| Discoverability | 81.5 |
| Contract Quality | 70.8 |
| Governance | 20.8 |
| Operational Transparency | 36.8 |
| Developer Ergonomics | 62.5 |
| Commercial Clarity | 60.5 |

## Agent readiness — 47.1 (agent-ready)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | no |
| MCP Server | derived |
| Auth Clarity | yes |
| Idempotency | no |
| Error Semantics | verified |
| OpenAPI Examples | verified |
| Rate Limit Signal | documented |
| Event Surface Described | derived |
| Agent Skills | derived |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |

## Access

Self-serve signup — onboarding: self-serve, pricing: unknown, trial: no (confidence: medium).

## APIs (11)

- **Modulate Velma 2 Accent Batch API** — The Velma 2 Accent Batch API from Modulate — 1 operation(s) for velma 2 accent batch.
- **Modulate Velma 2 Ai Music Detection Batch API** — The Velma 2 Ai Music Detection Batch API from Modulate — 1 operation(s) for velma 2 ai music detection batch.
- **Modulate Velma 2 Batch API** — The Velma 2 Batch API from Modulate — 2 operation(s) for velma 2 batch.
- **Modulate Velma 2 Emotion Batch API** — The Velma 2 Emotion Batch API from Modulate — 1 operation(s) for velma 2 emotion batch.
- **Modulate Velma 2 Language Detection Batch API** — The Velma 2 Language Detection Batch API from Modulate — 1 operation(s) for velma 2 language detection batch.
- **Modulate Velma 2 Music Detection Batch API** — The Velma 2 Music Detection Batch API from Modulate — 1 operation(s) for velma 2 music detection batch.
- **Modulate Velma 2 Pii Phi Redaction Batch API** — The Velma 2 Pii Phi Redaction Batch API from Modulate — 1 operation(s) for velma 2 pii phi redaction batch.
- **Modulate Velma 2 Stt Batch API** — The Velma 2 Stt Batch API from Modulate — 1 operation(s) for velma 2 stt batch.
- **Modulate Velma 2 Stt Batch English Vfast API** — The Velma 2 Stt Batch English Vfast API from Modulate — 1 operation(s) for velma 2 stt batch english vfast.
- **Modulate Velma 2 Stt Batch Multilingual Vfast API** — The Velma 2 Stt Batch Multilingual Vfast API from Modulate — 1 operation(s) for velma 2 stt batch multilingual vfast.
- **Modulate Velma 2 Synthetic Voice Detection Batch API** — The Velma 2 Synthetic Voice Detection Batch API from Modulate — 1 operation(s) for velma 2 synthetic voice detection batch.

## MCP servers (1)

- **modulate-mcp.yml**

## Security (3)

- **Modulate Authentication** — apiKey · 1 scheme
- **Modulate Domain Security** — TLSv1.3 · HSTS · DMARC
- **Modulate Trust Center** — SOC 2, ISO 27001, GDPR

## Tags

Company, Ai, Voice AI, Speech to Text, Transcription, Deepfake Detection, Content Moderation, Trust and Safety, Audio, Machine Learning, PII Redaction, Voice Intelligence

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/modulate/). Scores are computed from the provider's own public artifacts under a published rubric.