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Speech-to-text API

A speech-to-text API for developers building in Europe.

Build voice-driven products without compromising on privacy, sustainability, or European data sovereignty. Real-time and batch transcription, multilingual, EU-hosted.

Powered by Deepgram's Nova-3 model under the hood, served from European infrastructure, with the same privacy guarantees as the rest of the GreenPT platform.

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The case

For any developer building voice-powered products in Europe.

Most speech APIs make you choose between accuracy, language coverage, and where the audio is processed. GreenPT's STT API doesn't ask you to compromise.

  • Multilingual transcription that handles Dutch, German, French, Spanish, Italian, and English

  • Speaker diarization built in, no separate model required

  • Real-time streaming and batch — same endpoint, your choice

  • EU-hosted infrastructure with verifiable data residency

  • Audio is processed, not retained or used for training

API capabilities

What the API does.

  • Multilingual transcription

    Drop in audio in any major European language and get accurate transcripts back. No per-language model swaps.

  • Speaker diarization

    Identify and label individual speakers in multi-person recordings, meetings, and interviews.

  • Blazing-fast processing

    Sub-second latency for streaming, multi-times-realtime throughput for batch jobs.

  • Real-time streaming

    Open a WebSocket, stream audio in, get transcripts as they happen. Built for live interfaces.

  • EU-hosted and sovereign

    Every byte of audio stays inside European borders. No US fallback, no global pipeline.

  • Privacy-first by design

    No retention, no training, no third-party calls. Process the audio and forget it.

Performance metrics

GreenPT's data centres deliver a PUE of 1.25 (versus the industry average of 1.55) and a WUE of 0.25 (compared with the sector's 1.8), indicating markedly higher power and water efficiency. All of the electricity is from renewable sources, 100% versus the typical 60% share in the industry.

  1. 1.25 PUE Sector average 1.55
  2. 0.25 WUE Sector average 1.8
  3. 100% Green energy Sector average 60%
↳ Source: Scaleway Impact Report 2025

See the difference

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  • 100% Renewable
  • EU Hosted
  • GDPR-aligned