Добавьте файлы проекта.

YandexMusic.API/Models/Radio/Restriction/YRestriction.cs

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+namespace YandexMusic.API.Models.Radio.Restriction
+{
+    public sealed class YRestrictionConverter : JsonConverter
+    {
+        public override bool CanConvert(Type objectType)
+        {
+            return typeof(YRestriction).IsAssignableFrom(objectType);
+        }
+
+        public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
+        {
+            if (reader.TokenType == JsonToken.Null)
+                return null;
+
+            JObject jObject = JObject.Load(reader);
+            YRestriction restriction;
+
+            try
+            {
+                YRestrictionType type = jObject["type"].ToObject<YRestrictionType>();
+
+                switch (type)
+                {
+                    case YRestrictionType.Enum:
+                        restriction = jObject.ToObject<YRestrictionEnum>();
+                        break;
+                    case YRestrictionType.DiscreteScale:
+                        restriction = jObject.ToObject<YRestrictionDiscreteScale>();
+                        break;
+                    default:
+                        restriction = jObject.ToObject<YRestriction>();
+                        break;
+                }
+            }
+            catch (Exception ex)
+            {
+                throw new Exception($"Ошибка десериализации типа \"{objectType.Name}\".", ex);
+            }
+
+            return restriction;
+        }
+
+        public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
+        {
+            throw new NotImplementedException();
+        }
+    }
+
+    public class YRestriction
+    {
+        public string Name { get; set; }
+        public YRestrictionType Type { get; set; }
+    }
+}

YandexMusic.API/Models/Radio/Restriction/YRestrictionDiscreteScale.cs

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+namespace YandexMusic.API.Models.Radio.Restriction
+{
+    public class YRestrictionDiscreteScale : YRestriction
+    {
+        public YRestrictionValue<int> Min { get; set; }
+        public YRestrictionValue<int> Max { get; set; }
+    }
+}

YandexMusic.API/Models/Radio/Restriction/YRestrictionEnum.cs

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+namespace YandexMusic.API.Models.Radio.Restriction
+{
+    public class YRestrictionEnum : YRestriction
+    {
+        public List<YRestrictionValue<string>> PossibleValues { get; set; }
+    }
+}

YandexMusic.API/Models/Radio/Restriction/YRestrictionType.cs

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+using System.Runtime.Serialization;
+
+namespace YandexMusic.API.Models.Radio.Restriction
+{
+    [JsonConverter(typeof(StringEnumConverter))]
+    public enum YRestrictionType
+    {
+        [EnumMember(Value = "discrete-scale")]
+        DiscreteScale,
+        Enum
+    }
+}

YandexMusic.API/Models/Radio/Restriction/YRestrictionValue.cs

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+namespace YandexMusic.API.Models.Radio.Restriction
+{
+    public class YRestrictionValue<T>
+    {
+        public string Name { get; set; }
+        public T Value { get; set; }
+    }
+}