diff --git a/Sources/Internal/Protocols/APIClient.swift b/Sources/Internal/Protocols/APIClient.swift
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+++ b/Sources/Internal/Protocols/APIClient.swift
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+//===----------------------------------------------------------------------===
+//
+// This source file is part of the AmiiboAPI open source project
+//
+// Copyright (c) 2024 Röck+Cöde VoF. and the AmiiboAPI project authors
+// Licensed under the EUPL 1.2 or later.
+//
+// See LICENSE for license information
+// See CONTRIBUTORS for the list of AmiiboAPI project authors
+//
+//===----------------------------------------------------------------------===
+
+import Foundation
+
+public protocol APIClient {
+    
+    // MARK: Functions
+    
+    func getAmiibos(by filter: AmiiboFilter) async throws -> [Amiibo]
+    func getAmiiboSeries(by filter: AmiiboSeriesFilter) async throws -> [AmiiboSeries]
+    func getAmiiboTypes(by filter: AmiiboTypeFilter) async throws -> [AmiiboType]
+    func getGameCharacters(by filter: GameCharacterFilter) async throws -> [GameCharacter]
+    func getGameSeries(by filter: GameSeriesFilter) async throws -> [GameSeries]
+    func getLastUpdated() async throws -> Date
+    
+}