As you can see, utilizing this speech-to-text API is extremely easy. All it takes is an API key, which is free to get and an audio file to transcribe. Additionally, the API delivers next-level functionality out-of-the-box that many services charge a premium for. For this free offering, there is also no credit card required, as Whisper API believes that the speech-to-text service should speak for itself before requiring any commitments from its user.