Streaming Endpoints and Data Zones

Choose the endpoint that best fits your application’s requirements, whether that’s achieving the lowest possible latency or ensuring your audio data stays within a specific geographic region.

Data processing locations

All streaming audio and transcription data is processed in AWS regions located in the United States and the European Union: US

AWS region	Location
`us-east-1`	N. Virginia
`us-east-2`	Ohio
`us-west-1`	N. California
`us-west-2`	Oregon

AWS region	Location
`eu-central-1`	Frankfurt
`eu-north-1`	Stockholm
`eu-south-1`	Milan
`eu-south-2`	Spain
`eu-west-1`	Ireland
`eu-west-3`	Paris

Which of these locations processes your data depends on the endpoint you connect to, as described below.

Edge Routing

The default endpoint automatically routes requests to the nearest available region, minimizing latency for real-time transcription. Your data may be processed in any of the US or EU locations listed above. With infrastructure distributed across the US and EU, this endpoint delivers best-in-class streaming performance regardless of where your users are located.

Endpoint	WebSocket URL
Edge Routing (default)	`wss://streaming.assemblyai.com/v3/ws`

Data Zone Routing

Data Zone endpoints guarantee your data never leaves the specified region. This is designed for organizations with strict data residency and governance requirements. Your audio and transcription data is processed exclusively in that zone’s locations listed above and remains entirely within the US or EU, respectively.

Endpoint	WebSocket URL
US data residency	`wss://streaming.us.assemblyai.com/v3/ws`
EU data residency	`wss://streaming.eu.assemblyai.com/v3/ws`

Which endpoint should I use?

Optimizing for latency? Use Edge Routing (default). No configuration change is needed, as it automatically routes to the nearest region for the fastest response.
Need data residency? Use a Data Zone endpoint. Choose US or EU to ensure your audio and transcription data stays within that region.

How to use it

Edge Routing is the default. If you’re using the SDKs without overriding the base URL, you’re already using this endpoint and no configuration change is required. To use a Data Zone endpoint, set the endpoint URL when you connect. The examples below use the US Data Zone endpoint. For the EU Data Zone, replace us with eu.

Python SDK
Python
Javascript
JavaScript SDK

client = RealTimeTranscriber(
    RealTimeTranscriberOptions(api_host="streaming.us.assemblyai.com"),
    api_key=api_key,
)

API_ENDPOINT_BASE_URL = "wss://streaming.us.assemblyai.com/v3/ws"
API_ENDPOINT = f"{API_ENDPOINT_BASE_URL}?{urlencode(CONNECTION_PARAMS)}"

const API_ENDPOINT_BASE_URL = "wss://streaming.us.assemblyai.com/v3/ws";
const API_ENDPOINT = `${API_ENDPOINT_BASE_URL}?${querystring.stringify(CONNECTION_PARAMS)}`;

const client = new AssemblyAI({
  apiKey: "<YOUR_API_KEY>",
  streamingBaseUrl: "wss://streaming.us.assemblyai.com",
});

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Streaming Endpoints and Data Zones

Data processing locations

Edge Routing

Data Zone Routing

Which endpoint should I use?

How to use it

​Data processing locations

​Edge Routing

​Data Zone Routing

​Which endpoint should I use?

​How to use it

Data processing locations

Edge Routing

Data Zone Routing

Which endpoint should I use?

How to use it