diff --git a/CryptoWidgetKitApp/ContentView.swift b/CryptoWidgetKitApp/ContentView.swift
index fb33291..4457347 100644
--- a/CryptoWidgetKitApp/ContentView.swift
+++ b/CryptoWidgetKitApp/ContentView.swift
@@ -12,6 +12,7 @@ struct ContentView: View {
     @Environment(CryptoViewModel.self) var cryptoViewModel
     
     var body: some View {
+        @Bindable var cryptoViewModel = cryptoViewModel
         NavigationStack {
             List(cryptoViewModel.cryptos, id: \.coinInfo.id) { crypto in
                 HStack {
@@ -20,7 +21,27 @@ struct ContentView: View {
                     Text(crypto.display?.usd.price ?? "0")
                 }
             }
+            .redacted(reason: cryptoViewModel.isLoading ? .placeholder : [])
             .task { await cryptoViewModel.fetch() }
+            .refreshable { await cryptoViewModel.fetch() }
+            .alert(isPresented: $cryptoViewModel.showError, content: {
+                Alert(title: Text("An error occurred, try again later"),
+                      dismissButton: .default(
+                        Text("Retry"),
+                        action: {
+                            Task {
+                                await cryptoViewModel.fetch()
+                            }
+                        }))
+            })
+            .toolbar {
+                ToolbarItemGroup(placement: .bottomBar) {
+                    Text("API Cache 120 seconds")
+                        .font(.footnote)
+                        .foregroundColor(.secondary)
+                        .frame(maxWidth: .infinity)
+                }
+            }
         }
     }
 }
diff --git a/CryptoWidgetKitApp/ViewModels/CryptoViewModel.swift b/CryptoWidgetKitApp/ViewModels/CryptoViewModel.swift
index 55b73e1..faf940a 100644
--- a/CryptoWidgetKitApp/ViewModels/CryptoViewModel.swift
+++ b/CryptoWidgetKitApp/ViewModels/CryptoViewModel.swift
@@ -13,13 +13,17 @@ final class CryptoViewModel {
     
     // MARK: - Properties
     private(set) var cryptos: [Crypto] = []
+    private(set) var isLoading: Bool = true
+    var showError: Bool = false
     
     // MARK: - Dependencies
     private let apiService: CryptoAPIService
     
     // MARK: - Init
-    init(apiService: CryptoAPIService = CryptoAPIService()) {
+    init(apiService: CryptoAPIService = CryptoAPIService(),
+         initialState: [Crypto] = .mock) {
         self.apiService = apiService
+        self.cryptos = initialState
     }
 }
 
@@ -28,10 +32,25 @@ extension CryptoViewModel {
     
     /// Fetch the cryptos from API and update the cryptos array
     func fetch() async {
+        isLoading = true
         do {
+            sleep(3)
             cryptos = try await apiService.fetchRetrieveFullList().data
+            isLoading = false
         } catch {
             print(error)
+            showError = true
+        }
+    }
+}
+
+// MARK: - Crypto Extension
+extension [Crypto] {
+    
+    /// Mock Crypto
+    static var mock: [Crypto] {
+        (0..<5).map {
+            Crypto(coinInfo: CoinInfo(id: $0.description, name: "name", fullName: "fullName", imageURL: "imageURL"), display: nil)
         }
     }
 }
diff --git a/codecov.yml b/codecov.yml
new file mode 100644
index 0000000..302515a
--- /dev/null
+++ b/codecov.yml
@@ -0,0 +1,16 @@
+# Refs:
+# - https://docs.codecov.com/docs/common-recipe-list
+# - https://docs.codecov.com/docs/codecovyml-reference
+#
+# After making changes, run below command to validate
+# curl --data-binary @codecov.yml https://codecov.io/validate
+coverage:
+  status:
+    project:
+      default:
+        target: 80%
+        threshold: 1%
+    patch:
+      default:
+        target: 60%
+        threshold: 1%
\ No newline at end of file