Hi @stef-k , if you check the official doc with example about using ASP.NET Core SignalR .NET client library, you can find that it enables us to connect to a SignalR hub by configuring the HubConnection to use HTTP-based transports to connect to the specified URL.
connect to a third party websocket service to pull data
If you'd like to implement a client to connect to a WebSocket endpoint, you can try to use the ClientWebSocket api.
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With Regards,
Fei Han