Fact · Speech recognition
Azure's REST speech to text API accepts your Speech resource key in the Ocp-Apim-Subscription-Key header.
Checked against its source on October 17, 2026
In the source's own words
“When you're using the Ocp-Apim-Subscription-Key header, only your resource key must be provided”
Speech to text REST API for short audio, Microsoft Learn (Azure AI Speech), n.d., Authentication.
Open the original- What it measures
- A resource key is a secret that bills to your account. Keep it out of client-side code.
- What it does not show
- Bearer tokens are an alternative, and they expire after 10 minutes.