diff --git a/Sources/MarketKit/Classes/Chart/HsChartHelper.swift b/Sources/MarketKit/Classes/Chart/HsChartHelper.swift
index 4cc8b18..d2b8959 100644
--- a/Sources/MarketKit/Classes/Chart/HsChartHelper.swift
+++ b/Sources/MarketKit/Classes/Chart/HsChartHelper.swift
@@ -13,7 +13,7 @@ public enum HsChartHelper {
     }
 
     public static func validIntervals(startTime: TimeInterval?) -> [HsTimePeriod] {
-        guard let startTime else { return HsTimePeriod.allCases }
+        guard let startTime else { return HsTimePeriod.all }
         let genesisDate = Date(timeIntervalSince1970: startTime)
         let dayCount = Calendar.current.dateComponents([.day], from: genesisDate, to: Date()).day
         let monthCount = Calendar.current.dateComponents([.month], from: genesisDate, to: Date()).month
diff --git a/Sources/MarketKit/Classes/Models/HsTimePeriod.swift b/Sources/MarketKit/Classes/Models/HsTimePeriod.swift
index 85aebad..ff4fe12 100644
--- a/Sources/MarketKit/Classes/Models/HsTimePeriod.swift
+++ b/Sources/MarketKit/Classes/Models/HsTimePeriod.swift
@@ -1,6 +1,8 @@
 import Foundation
 
 public enum HsTimePeriod: String, CaseIterable {
+    static var all: [Self] = [.day1, .week1, .week2, .month1, .month3, .month6, .year1, .year2, .year5]
+
     case hour24 = "24h"
     case day1 = "1d"
     case week1 = "1w"