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Voice Gateway


Transcribe speech into text.

Service Docs

Voice Gateway : Speech-to-Text

People like talking. Let them do the talking and your application do the listening. With Speech-to-Text you can take human speech and convert it into text that you application can act upon.

The Speech-to-Text service allows an application to have a speech-to-text (STT) conversion performed on a long or short audio stream and for the speech in that audio stream to be transcribed as text. This service can be used in interactive systems (e.g. voice controlled systems) or for offline transcribing of speech.

  • Upload an audio file (MP3)
  • Storage of text from TTS converted speech
  • Retrieve text of speech once TTS conversion complete
  • Realtime transcription of speech (coming soon)

Find us on Zapier. Use our invite link to access Melrose Labs Speech.

Zapier: Melrose Labs Speech

Using the Service

The Melrose Labs Speech-to-Text service is available using the Speech-to-Text REST API and Zapier (Melrose Labs Speech).

Note that the Speech-to-Text service requires MP3 files to be sampled at 22050 Hz. The service may not convert speech to the correct text in all cases.

The Melrose Labs Speech-to-Text service is available using our REST API:

Convert speech to text using the Voice Gateway Speech-to-Text service with RESTful Voice API
Example using cURL

Submit conversion request


curl -X POST "" \
    -H 'Content-Type: audio/mp3' \
    -H 'x-api-key: [API_KEY]' \
    --data-binary @file.mp3


{"transactionID": "1ccead78-6550-4aac-a6b4-a4942b908659"}

Retrieve text of speech


curl -X GET "" \
    -H 'x-api-key: [API_KEY]'


{"text": "Alice was beginning to get very tired of sitting by her sister on the bank and of having nothing to do."}

The Speech-to-Text service is one of the many building blocks we are releasing over the coming months as part of the Voice Gateway, and making available through the Voice API.

Need to convert text-to-speech? See our Text-to-Speech service.

Follow us on LinkedIn for updates on Melrose Labs Speech-to-Text and our other services.

Service snapshot

  • Convert file (MP3) containing speech to text
  • Syncronous and asyncronous RESTful API
  • Text storage
  • Fast automatic speech recognition

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