Blazor (www.blazor.net) seems to be the next revolution in web programming, where C# can be used instead of Javascript.

However, WebAssembly is in essence still Javascript, and thus it seems that the C# client for Servicestack cannot be used:

https://stackoverflow.com/questions/56386712/servicestack-adding-blazor-support

I would suggest looking into supporting Blazor client-side programming with ServiceStack, at least a C# client that works with the ServiceStack cli (https://docs.servicestack.net/csharp-client).

Regards