# Gradium

**Canonical:** https://apis.io/providers/gradium/  
**Website:** https://gradium.ai  
**APIs profiled:** 6

Gradium is a voice AI lab (Paris and Silicon Valley) building audio language models for real-time, low-latency Text-to-Speech, Speech-to-Text, and Speech-to-Speech translation. Founded in 2025 by ex-DeepMind / Meta / Kyutai researchers (Neil Zeghidour, Olivier Teboul, Laurent Mazaré, Alexandre Défossez), Gradium exposes a developer API over REST and WebSocket featuring instant voice cloning from a 10-second sample, custom pronunciation dictionaries, sub-300ms time-to-first-token streaming, and multilingual support (English, French, German, Spanish, Portuguese). It ships first-party Python and Rust SDKs, a `gradium` CLI, and the open-source gradbot voice-agent framework, and is available on AWS Marketplace / SageMaker. Backed by a $70M seed round with participation from Amplify Partners, Eric Schmidt, and Xavier Niel.

## Kin Score — 55.5 / 100 (developing)

Scored 2026-08-17 under rubric 0.11.0. Trend: flat (+0.0 from 55.5).

| Facet | Score |
|---|---|
| Discoverability | 81.5 |
| Contract Quality | 58.1 |
| Governance | 11.5 |
| Operational Transparency | 44.7 |
| Developer Ergonomics | 75.5 |
| Commercial Clarity | 52.6 |

## Agent readiness — 40.8 (agent-ready)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | no |
| MCP Server | derived |
| Auth Clarity | yes |
| Idempotency | no |
| Error Semantics | verified |
| OpenAPI Examples | no |
| 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 (6)

- **Gradium metering API** — The metering API from Gradium — 1 operation(s) for metering.
- **Gradium Pronunciations API** — Manage pronunciation dictionaries for custom text rewriting
- **Gradium S2S API** — The S2S API from Gradium — 1 operation(s) for s2s.
- **Gradium STT API** — Speech-to-Text endpoints for converting audio to text
- **Gradium TTS API** — Text-to-Speech endpoints for converting text to audio
- **Gradium Voices API** — Manage custom voice clones

## MCP servers (1)

- **gradium-mcp.yml**

## Security (2)

- **Gradium Authentication** — apiKey/bearer-token · 2 schemes
- **Gradium Domain Security** — TLSv1.3 · HSTS · DMARC

## Tags

Company, Ai Ml, Voice AI, Text-to-Speech, Speech-to-Text, Speech-to-Speech, Voice Cloning, Audio, Real-Time Streaming, WebSocket, Developer API, Voice Agents

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