profile.json

{
    "Gamertag": "lagkip",
    "Tier": "Silver",
    "Avatar": {
        "Full": "http://avatar.xboxlive.com/avatar/lagkip/avatar-body.png",
        "Small": "http://avatar.xboxlive.com/avatar/lagkip/avatarpic-s.png",
        "Large": "http://avatar.xboxlive.com/avatar/lagkip/avatarpic-l.png",
        "Tile": "http://avatar.xboxlive.com/avatar/Lagkip/avatarpic-l.png"
    },
    "Gamerscore": "395",
    "Reputation": 60,
    "Presence": "Offline",
    "Online": false,
    "Motto": "None",
    "Name": "",
    "Location": "",
    "Biography": "",
    "Friends": {
        "Href": "http://localhost:7820/profile/lagkip/friends"
    },
    "Games": {
        "Href": "http://localhost:7820/profile/lagkip/games"
    }
}

ProfileModule.cs

public class ProfileModule : ModuleBase
{
    public ProfileModule()
    {
        Get["/profile/{gamertag}"] = context =>
        {
            Profile profile = XboxClient.Profile.GetProfile(context.Gamertag);

            if (profile == null)
                return this.ErrorMessage(HttpStatusCode.BadRequest, "Profile does not exist.");
            
            dynamic profileDto = profile.ToExpandoObject();
            profileDto.Friends = new { Href = "http://localhost:7820/profile/" + context.Gamertag + "/friends"};
            profileDto.Games = new { Href = "http://localhost:7820/profile/" + context.Gamertag + "/games" };
            return profileDto;
        };
    }
}