diff --git a/Gemfile.lock b/Gemfile.lock
index 413fd8c..8a4b0e7 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -2,7 +2,7 @@ PATH
   remote: .
   specs:
     ontologies_api_client (2.2.0)
-      activesupport
+      activesupport (~> 7.0.4)
       excon
       faraday
       faraday-excon (~> 2.0.0)
@@ -10,12 +10,13 @@ PATH
       lz4-ruby
       multi_json
       oj
+      parallel
       spawnling (= 2.1.5)
 
 GEM
   remote: https://rubygems.org/
   specs:
-    activesupport (7.0.4)
+    activesupport (7.0.8.1)
       concurrent-ruby (~> 1.0, >= 1.0.2)
       i18n (>= 1.6, < 2)
       minitest (>= 5.1)
@@ -24,11 +25,12 @@ GEM
       public_suffix (>= 2.0.2, < 6.0)
     bigdecimal (3.1.7)
     coderay (1.1.3)
-    concurrent-ruby (1.1.10)
+    concurrent-ruby (1.2.3)
+    connection_pool (2.4.1)
     crack (1.0.0)
       bigdecimal
       rexml
-    excon (0.95.0)
+    excon (0.110.0)
     faraday (2.0.1)
       faraday-net_http (~> 2.0)
       ruby2_keywords (>= 0.0.4)
@@ -39,26 +41,34 @@ GEM
       multipart-post (~> 2)
     faraday-net_http (2.1.0)
     hashdiff (1.1.0)
-    i18n (1.12.0)
+    i18n (1.14.4)
       concurrent-ruby (~> 1.0)
     lz4-ruby (0.3.3)
-    method_source (1.0.0)
-    minitest (5.16.3)
+    method_source (1.1.0)
+    minitest (5.22.3)
     multi_json (1.15.0)
-    multipart-post (2.2.3)
-    oj (3.13.23)
-    power_assert (2.0.2)
-    pry (0.14.1)
+    multipart-post (2.4.0)
+    oj (3.16.3)
+      bigdecimal (>= 3.0)
+    parallel (1.24.0)
+    power_assert (2.0.3)
+    pry (0.14.2)
       coderay (~> 1.1)
       method_source (~> 1.0)
     public_suffix (5.0.5)
-    rake (13.0.6)
+    rake (13.2.1)
+    redis (5.2.0)
+      redis-client (>= 0.22.0)
+    redis-client (0.22.1)
+      connection_pool
+    redis-namespace (1.11.0)
+      redis (>= 4)
     rexml (3.2.6)
     ruby2_keywords (0.0.5)
     spawnling (2.1.5)
-    test-unit (3.5.7)
+    test-unit (3.6.2)
       power_assert
-    tzinfo (2.0.5)
+    tzinfo (2.0.6)
       concurrent-ruby (~> 1.0)
     webmock (3.23.0)
       addressable (>= 2.8.0)
@@ -74,6 +84,8 @@ DEPENDENCIES
   ontologies_api_client!
   pry
   rake
+  redis (~> 5.2)
+  redis-namespace (~> 1.11)
   test-unit
   webmock
 
diff --git a/config/config.test.rb b/config/config.test.rb
index a5d6166..2771e77 100644
--- a/config/config.test.rb
+++ b/config/config.test.rb
@@ -1,14 +1,34 @@
-# config.rb is required for testing
-# unit test makes calls to bioportal api so it needs a valid API key which can
-# be set via ENV variable UT_APIKEY
-abort('UT_APIKEY env variable is not set. Canceling tests') unless ENV.include?('UT_APIKEY')
-abort('UT_APIKEY env variable is set to an empty value. Canceling tests') unless ENV['UT_APIKEY'].size > 5
+ENV['UT_APIKEY'] = '1de0a270-29c5-4dda-b043-7c3580628cd5'
 $API_CLIENT_INVALIDATE_CACHE = false
 $DEBUG_API_CLIENT = false
+
 LinkedData::Client.config do |config|
-  config.rest_url   = 'https://data.bioontology.org'
-  config.apikey     = ENV['UT_APIKEY']
-#  config.apikey     = 'xxxxx-xxxxx-xxxxxxxxxx'
+  config.rest_url = 'https://data.agroportal.lirmm.fr/'
+  config.apikey = '1de0a270-29c5-4dda-b043-7c3580628cd5'
   config.links_attr = 'links'
-  config.cache      = false
+  config.cache = true
+  config.debug_client = true
+  config.debug_client_keys = []
+  config.federated_portals = {
+    bioportal: {
+      api: 'https://data.bioontology.org/',
+      apikey: '8b5b7825-538d-40e0-9e9e-5ab9274a9aeb',
+      color: '#234979',
+    },
+    ecoportal: {
+      api: 'https://data.ecoportal.lifewatch.eu/',
+      apikey: "43a437ba-a437-4bf0-affd-ab520e584719",
+      color: '#0f4e8a',
+    },
+    earthportal: {
+      api: 'https://earthportal.eu:8443/',
+      apikey: "c9147279-954f-41bd-b068-da9b0c441288",
+      color: '#1e2251',
+    },
+    biodivportal: {
+      api: 'https://data.biodivportal.gfbio.org/',
+      apikey: "47a57aa3-7b54-4f34-b695-dbb5f5b7363e",
+      color: '#1e2251',
+    }
+  }
 end
diff --git a/lib/ontologies_api_client/base.rb b/lib/ontologies_api_client/base.rb
index ff4aba6..a4404df 100644
--- a/lib/ontologies_api_client/base.rb
+++ b/lib/ontologies_api_client/base.rb
@@ -132,11 +132,16 @@ def create_attributes(attributes)
           attr_exists = self.public_methods(false).include?(attr)
           unless attr_exists
             self.class.class_eval do
-              define_method attr.to_sym do
-                instance_variable_get("@#{attr}")
+              unless method_defined?(attr.to_sym)
+                define_method attr.to_sym do
+                  instance_variable_get("@#{attr}")
+                end
               end
-              define_method "#{attr}=" do |val|
-                instance_variable_set("@#{attr}", val)
+
+              unless method_defined?("#{attr}=".to_sym)
+                define_method "#{attr}=" do |val|
+                  instance_variable_set("@#{attr}", val)
+                end
               end
             end
           end
diff --git a/lib/ontologies_api_client/collection.rb b/lib/ontologies_api_client/collection.rb
index 77572bf..0e38d0a 100644
--- a/lib/ontologies_api_client/collection.rb
+++ b/lib/ontologies_api_client/collection.rb
@@ -24,8 +24,8 @@ def method_missing(meth, *args, &block)
 
         ##
         # Get all top-level links for the API
-        def top_level_links
-          @top_level_links||= HTTP.get(LinkedData::Client.settings.rest_url)
+        def top_level_links(link = LinkedData::Client.settings.rest_url)
+          HTTP.get(link)
         end
 
         ##
@@ -36,11 +36,25 @@ def uri_from_context(object, media_type)
           end
         end
 
+        require 'parallel'
+
         ##
         # Get the first collection of resources for a given type
         def entry_point(media_type, params = {})
-          params = {include: @include_attrs}.merge(params)
-          HTTP.get(uri_from_context(top_level_links, media_type), params)
+          params = { include: @include_attrs }.merge(params)
+          federate = params.delete(:federate)
+
+          collections = [HTTP.get(uri_from_context(top_level_links, media_type), params)]
+
+          return collections.first unless federate
+
+          threads_count = LinkedData::Client.settings.federated_conn.size
+
+          connections = Parallel.map(LinkedData::Client.settings.federated_conn, in_threads: threads_count) do |conn|
+              HTTP.get(uri_from_context(top_level_links(conn.url_prefix.to_s), media_type), params, connection: conn)
+          end
+
+          connections.flatten
         end
 
         ##
diff --git a/lib/ontologies_api_client/config.rb b/lib/ontologies_api_client/config.rb
index 25805a8..21ca101 100644
--- a/lib/ontologies_api_client/config.rb
+++ b/lib/ontologies_api_client/config.rb
@@ -37,8 +37,21 @@ def config(&block)
 
     def config_connection(options = {})
       return if @settings_run_connection
-      store = options[:cache_store]
-      @settings.conn = Faraday.new(@settings.rest_url) do |faraday|
+      store = options[:cache_store] || ActiveSupport::Cache::MemoryStore.new
+      @settings.conn = faraday_connection(@settings.rest_url, @settings.apikey, store)
+      @settings.federated_conn = @settings.federated_portals.map do |portal_name, portal_info|
+        faraday_connection(portal_info[:api], portal_info[:apikey], store)
+      end
+      @settings_run_connection = true
+    end
+
+    def connection_configured?
+      @settings_run_connection
+    end
+
+    private
+    def faraday_connection(url, apikey, store)
+      Faraday.new(url) do |faraday|
         if @settings.enable_long_request_log
           require_relative 'middleware/faraday-long-requests'
           faraday.use :long_requests
@@ -69,15 +82,10 @@ def config_connection(options = {})
         faraday.adapter :excon
         faraday.headers = {
           "Accept" => "application/json",
-          "Authorization" => "apikey token=#{@settings.apikey}",
+          "Authorization" => "apikey token=#{apikey}",
           "User-Agent" => "NCBO API Ruby Client v0.1.0"
         }
       end
-      @settings_run_connection = true
-    end
-
-    def connection_configured?
-      @settings_run_connection
     end
   end
 end
\ No newline at end of file
diff --git a/lib/ontologies_api_client/http.rb b/lib/ontologies_api_client/http.rb
index d3df241..fb8bf20 100644
--- a/lib/ontologies_api_client/http.rb
+++ b/lib/ontologies_api_client/http.rb
@@ -3,6 +3,7 @@
 require 'digest'
 require 'ostruct'
 require 'benchmark'
+require 'active_support/cache'
 ##
 # This monkeypatch makes OpenStruct act like Struct objects
 class OpenStruct
@@ -49,21 +50,27 @@ def self.conn
             store = rails.cache if rails.cache
           end
           LinkedData::Client.config_connection(cache_store: store)
+          LinkedData::Client.config_connection(cache_store: store || ActiveSupport::Cache::MemoryStore.new)
         end
         LinkedData::Client.settings.conn
       end
 
+      def self.federated_conn
+        LinkedData::Client.settings.federated_conn
+      end
+
       def self.get(path, params = {}, options = {})
         headers = options[:headers] || {}
         raw = options[:raw] || false # return the unparsed body of the request
         params = params.delete_if { |k, v| v == nil || v.to_s.empty? }
         params[:ncbo_cache_buster] = Time.now.to_f if raw # raw requests don't get cached to ensure body is available
         invalidate_cache = params.delete(:invalidate_cache) || $API_CLIENT_INVALIDATE_CACHE || false
+        connection = options[:connection] || conn
         begin
           begin
             response = nil
             time = Benchmark.realtime do
-              response = conn.get do |req|
+              response = connection.get do |req|
                 req.url path
                 req.params = params.dup
                 req.options[:timeout] = 60
@@ -71,7 +78,7 @@ def self.get(path, params = {}, options = {})
                 req.headers[:invalidate_cache] = invalidate_cache
               end
             end
-            puts "Getting: #{path} with #{params} (#{time}s)" if $DEBUG_API_CLIENT
+            puts "Getting: #{path} with #{params} (t: #{time}s - cache: #{response.headers["X-Rack-Cache"]})" if $DEBUG_API_CLIENT
           rescue Exception => e
             params = Faraday::Utils.build_query(params)
             path << "?" unless params.empty? || path.include?("?")
diff --git a/lib/ontologies_api_client/middleware/faraday-object-cache.rb b/lib/ontologies_api_client/middleware/faraday-object-cache.rb
index 4e9eb65..7b30722 100644
--- a/lib/ontologies_api_client/middleware/faraday-object-cache.rb
+++ b/lib/ontologies_api_client/middleware/faraday-object-cache.rb
@@ -1,4 +1,5 @@
 require 'digest/sha1'
+require 'active_support'
 require 'active_support/cache'
 require 'lz4-ruby'
 require_relative '../http'
@@ -70,7 +71,7 @@ def retrieve_cached_response(request_key)
       env = { status: 304 }
       cached_response = ObjectCacheResponse.new(env)
       cached_response.parsed_body = ld_obj
-      cached_response.env.response_headers = { "x-rack-cache" => 'hit' }
+      cached_response.env.response_headers = { "X-Rack-Cache" => 'hit' }
       cached_response
     end
 
@@ -88,7 +89,7 @@ def process_response(response_env, request_key)
 
       response = ObjectCacheResponse.new(response_env)
       response.parsed_body = ld_obj
-      response.env.response_headers["x-rack-cache"] = cache_state
+      response.env.response_headers["X-Rack-Cache"] = cache_state
       response
     end
 
diff --git a/ontologies_api_client.gemspec b/ontologies_api_client.gemspec
index fad13e4..af30944 100644
--- a/ontologies_api_client.gemspec
+++ b/ontologies_api_client.gemspec
@@ -12,7 +12,7 @@ Gem::Specification.new do |gem|
   gem.require_paths = ["lib"]
   gem.version       = "2.2.0"
 
-  gem.add_dependency('activesupport')
+  gem.add_dependency('activesupport', '~> 7.0.4')
   gem.add_dependency('excon')
   gem.add_dependency('faraday')
   gem.add_dependency('faraday-excon', '~> 2.0.0')
@@ -20,5 +20,6 @@ Gem::Specification.new do |gem|
   gem.add_dependency('lz4-ruby')
   gem.add_dependency('multi_json')
   gem.add_dependency('oj')
+  gem.add_dependency('parallel')
   gem.add_dependency('spawnling', '2.1.5')
 end
diff --git a/test/middleware/test_cache.rb b/test/middleware/test_cache.rb
index ddea7a9..bdd97b1 100644
--- a/test/middleware/test_cache.rb
+++ b/test/middleware/test_cache.rb
@@ -20,6 +20,10 @@ def setup
     end
   end
 
+  def teardown
+    WebMock.disable!
+  end
+
   def test_cache_hit_for_get_request
     body1, body2 = nil
     # First request should not hit the cache
diff --git a/test/models/test_federation.rb b/test/models/test_federation.rb
new file mode 100644
index 0000000..1720bff
--- /dev/null
+++ b/test/models/test_federation.rb
@@ -0,0 +1,69 @@
+require_relative '../test_case'
+require 'pry'
+require 'benchmark'
+
+class FederationTest < LinkedData::Client::TestCase
+
+  def test_cache
+    onts = LinkedData::Client::Models::Ontology.all
+    onts = LinkedData::Client::Models::Ontology.all
+  end
+
+  def test_federated_ontologies_all
+    onts = []
+    time1 = Benchmark.realtime do
+      onts = LinkedData::Client::Models::Ontology.all
+    end
+
+    onts_federate = []
+    time2 = Benchmark.realtime do
+      onts_federate = LinkedData::Client::Models::Ontology.all(federate: true)
+    end
+
+    puts ""
+    puts "AgroPortal ontologies: #{onts.length} in #{time1}s"
+    puts "Federated ontologies: #{onts_federate.length} in #{time2}s"
+
+    refute_equal onts.length, onts_federate.length
+
+    onts_federate.group_by{|x| x.id.split('/')[0..-2].join('/')}.each do |portal, onts|
+      puts "#{portal} ontologies: #{onts.length}"
+    end
+
+    onts_federate = []
+    time2 = Benchmark.realtime do
+      onts_federate = LinkedData::Client::Models::Ontology.all(federate: true)
+    end
+    puts "Federated ontologies with cache: #{onts_federate.length} in #{time2}s"
+  end
+
+  def test_federated_submissions_all
+    onts = []
+    time1 = Benchmark.realtime do
+      onts = LinkedData::Client::Models::OntologySubmission.all
+    end
+
+    onts_federate = []
+    time2 = Benchmark.realtime do
+      onts_federate = LinkedData::Client::Models::OntologySubmission.all(federate: true)
+    end
+
+    puts ""
+    puts "AgroPortal submissions: #{onts.length} in #{time1}s"
+    puts "Federated submissions: #{onts_federate.length} in #{time2}s"
+
+    refute_equal onts.length, onts_federate.length
+
+    onts_federate.group_by{|x| x.id.split('/')[0..-4].join('/')}.each do |portal, onts|
+      puts "#{portal} submissions: #{onts.length}"
+    end
+
+    onts_federate = []
+    time2 = Benchmark.realtime do
+      onts_federate = LinkedData::Client::Models::OntologySubmission.all(federate: true)
+    end
+    puts "Federated submissions with cache: #{onts_federate.length} in #{time2}s"
+
+  end
+
+end
\ No newline at end of file
diff --git a/test/test_case.rb b/test/test_case.rb
index cd9fe2e..0f2f907 100644
--- a/test/test_case.rb
+++ b/test/test_case.rb
@@ -1,7 +1,9 @@
 require 'test-unit'
 require_relative '../lib/ontologies_api_client'
 require_relative '../config/config'
+require 'webmock'
 
+WebMock.allow_net_connect!
 module LinkedData
   module Client
     class TestCase < Test::Unit::TestCase