diff --git a/lib/algolia/api/abtesting_client.rb b/lib/algolia/api/abtesting_client.rb
index 45bdc9b3..84bac171 100644
--- a/lib/algolia/api/abtesting_client.rb
+++ b/lib/algolia/api/abtesting_client.rb
@@ -39,6 +39,14 @@ def self.create_with_config(config)
       new(config)
     end
 
+    # Helper method to switch the API key used to authenticate the requests.
+    #
+    # @param api_key [String] the new API key to use.
+    # @return [void]
+    def set_client_api_key(api_key)
+      @api_client.set_client_api_key(api_key)
+    end
+
     # Creates a new A/B test.
     #
     # Required API Key ACLs:
diff --git a/lib/algolia/api/analytics_client.rb b/lib/algolia/api/analytics_client.rb
index 3cfba8cc..00ecf4bf 100644
--- a/lib/algolia/api/analytics_client.rb
+++ b/lib/algolia/api/analytics_client.rb
@@ -39,6 +39,14 @@ def self.create_with_config(config)
       new(config)
     end
 
+    # Helper method to switch the API key used to authenticate the requests.
+    #
+    # @param api_key [String] the new API key to use.
+    # @return [void]
+    def set_client_api_key(api_key)
+      @api_client.set_client_api_key(api_key)
+    end
+
     # This method allow you to send requests to the Algolia REST API.
 
     # @param path [String] Path of the endpoint, anything after \"/1\" must be specified. (required)
diff --git a/lib/algolia/api/ingestion_client.rb b/lib/algolia/api/ingestion_client.rb
index b23c2110..97e72910 100644
--- a/lib/algolia/api/ingestion_client.rb
+++ b/lib/algolia/api/ingestion_client.rb
@@ -39,6 +39,14 @@ def self.create_with_config(config)
       new(config)
     end
 
+    # Helper method to switch the API key used to authenticate the requests.
+    #
+    # @param api_key [String] the new API key to use.
+    # @return [void]
+    def set_client_api_key(api_key)
+      @api_client.set_client_api_key(api_key)
+    end
+
     # Creates a new authentication resource.
     #
     # Required API Key ACLs:
diff --git a/lib/algolia/api/insights_client.rb b/lib/algolia/api/insights_client.rb
index 31692a70..7369f2bc 100644
--- a/lib/algolia/api/insights_client.rb
+++ b/lib/algolia/api/insights_client.rb
@@ -39,6 +39,14 @@ def self.create_with_config(config)
       new(config)
     end
 
+    # Helper method to switch the API key used to authenticate the requests.
+    #
+    # @param api_key [String] the new API key to use.
+    # @return [void]
+    def set_client_api_key(api_key)
+      @api_client.set_client_api_key(api_key)
+    end
+
     # This method allow you to send requests to the Algolia REST API.
 
     # @param path [String] Path of the endpoint, anything after \"/1\" must be specified. (required)
diff --git a/lib/algolia/api/monitoring_client.rb b/lib/algolia/api/monitoring_client.rb
index 5cd63b1f..53699951 100644
--- a/lib/algolia/api/monitoring_client.rb
+++ b/lib/algolia/api/monitoring_client.rb
@@ -24,6 +24,14 @@ def self.create_with_config(config)
       new(config)
     end
 
+    # Helper method to switch the API key used to authenticate the requests.
+    #
+    # @param api_key [String] the new API key to use.
+    # @return [void]
+    def set_client_api_key(api_key)
+      @api_client.set_client_api_key(api_key)
+    end
+
     # This method allow you to send requests to the Algolia REST API.
 
     # @param path [String] Path of the endpoint, anything after \"/1\" must be specified. (required)
diff --git a/lib/algolia/api/personalization_client.rb b/lib/algolia/api/personalization_client.rb
index bc8f0a6a..b8e4edb3 100644
--- a/lib/algolia/api/personalization_client.rb
+++ b/lib/algolia/api/personalization_client.rb
@@ -39,6 +39,14 @@ def self.create_with_config(config)
       new(config)
     end
 
+    # Helper method to switch the API key used to authenticate the requests.
+    #
+    # @param api_key [String] the new API key to use.
+    # @return [void]
+    def set_client_api_key(api_key)
+      @api_client.set_client_api_key(api_key)
+    end
+
     # This method allow you to send requests to the Algolia REST API.
 
     # @param path [String] Path of the endpoint, anything after \"/1\" must be specified. (required)
diff --git a/lib/algolia/api/query_suggestions_client.rb b/lib/algolia/api/query_suggestions_client.rb
index adda7fa3..c779edc0 100644
--- a/lib/algolia/api/query_suggestions_client.rb
+++ b/lib/algolia/api/query_suggestions_client.rb
@@ -39,6 +39,14 @@ def self.create_with_config(config)
       new(config)
     end
 
+    # Helper method to switch the API key used to authenticate the requests.
+    #
+    # @param api_key [String] the new API key to use.
+    # @return [void]
+    def set_client_api_key(api_key)
+      @api_client.set_client_api_key(api_key)
+    end
+
     # Creates a new Query Suggestions configuration.  You can have up to 100 configurations per Algolia application.
     #
     # Required API Key ACLs:
diff --git a/lib/algolia/api/recommend_client.rb b/lib/algolia/api/recommend_client.rb
index 732b35f2..6f7dfb0f 100644
--- a/lib/algolia/api/recommend_client.rb
+++ b/lib/algolia/api/recommend_client.rb
@@ -32,6 +32,14 @@ def self.create_with_config(config)
       new(config)
     end
 
+    # Helper method to switch the API key used to authenticate the requests.
+    #
+    # @param api_key [String] the new API key to use.
+    # @return [void]
+    def set_client_api_key(api_key)
+      @api_client.set_client_api_key(api_key)
+    end
+
     # This method allow you to send requests to the Algolia REST API.
 
     # @param path [String] Path of the endpoint, anything after \"/1\" must be specified. (required)
diff --git a/lib/algolia/api/search_client.rb b/lib/algolia/api/search_client.rb
index a718a390..ab544b62 100644
--- a/lib/algolia/api/search_client.rb
+++ b/lib/algolia/api/search_client.rb
@@ -35,6 +35,14 @@ def self.create_with_config(config)
       new(config)
     end
 
+    # Helper method to switch the API key used to authenticate the requests.
+    #
+    # @param api_key [String] the new API key to use.
+    # @return [void]
+    def set_client_api_key(api_key)
+      @api_client.set_client_api_key(api_key)
+    end
+
     # Creates a new API key with specific permissions and restrictions.
     #
     # Required API Key ACLs:
diff --git a/lib/algolia/api/usage_client.rb b/lib/algolia/api/usage_client.rb
index 402644c0..45b0430f 100644
--- a/lib/algolia/api/usage_client.rb
+++ b/lib/algolia/api/usage_client.rb
@@ -24,6 +24,14 @@ def self.create_with_config(config)
       new(config)
     end
 
+    # Helper method to switch the API key used to authenticate the requests.
+    #
+    # @param api_key [String] the new API key to use.
+    # @return [void]
+    def set_client_api_key(api_key)
+      @api_client.set_client_api_key(api_key)
+    end
+
     # This method allow you to send requests to the Algolia REST API.
 
     # @param path [String] Path of the endpoint, anything after \"/1\" must be specified. (required)
diff --git a/lib/algolia/api_client.rb b/lib/algolia/api_client.rb
index 44387622..25ebf835 100644
--- a/lib/algolia/api_client.rb
+++ b/lib/algolia/api_client.rb
@@ -20,6 +20,10 @@ def self.default
       @@default ||= ApiClient.new
     end
 
+    def set_client_api_key(api_key)
+      @config.set_client_api_key(api_key)
+    end
+
     # Call an API with given options.
     #
     # @return [Http::Response] the response.
diff --git a/lib/algolia/configuration.rb b/lib/algolia/configuration.rb
index f60a629f..03dc9bd5 100644
--- a/lib/algolia/configuration.rb
+++ b/lib/algolia/configuration.rb
@@ -44,6 +44,11 @@ def initialize(app_id, api_key, hosts, client_name, opts = {})
       yield(self) if block_given?
     end
 
+    def set_client_api_key(api_key)
+      @api_key = api_key
+      @header_params["X-Algolia-API-Key"] = api_key
+    end
+
     # The default Configuration object.
     def self.default
       @@default ||= Configuration.new