This is more like a personal notes for my reference. If it assists anyone it is a bonus. Assumed that You have created an account on blue-mix You have obtained the user-id and password (I will call them your_userid , your_password ) You have a speech file called speech.wav You desire to obtain the transcript in the file transcribed_speech.txt You have installed curl on your machine You are not behind a proxy.com Then from the command (long) line using curl curl -u your_userid : your_password -X POST --header "Content-Type: audio/wav" --header "Transfer-Encoding: chunked" --data-binary @ speech.wav https://stream.watsonplatform.net/speech-to-text/api/v1/recognize?continuous=true > transcribed_speech.txt should create the best according to watson speech to text engine transcription of the audio speech.wav in the file transcribed_speech.txt if you are behind a firewall with p_user as the user-id and p_passwd is the password. Then