Can we invoke Sitecore GraphQL as API using Postman

We have a requirement to get Sitecore items as invokable API using postman. Now postman is started supporting GraphQL. But when we try to invoke the Sitecore GraphQL I’m getting the error:

URL: domain/api/appname/ui?sc_apikey={key}

[HttpException]: A public action method ‘ui’ was not found on controller ‘Sitecore.Services.GraphQL.Hosting.Mvc.GraphQLController’.
at System.Web.Mvc.Controller.HandleUnknownAction(String actionName)

Can anyone suggest a way to expose using postman? I know Sitecore provides a nice GraphQL UI to browse through.

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