diff --git a/app/models/user_api_key_scope.rb b/app/models/user_api_key_scope.rb
index 60a4ca72dcb..11bd403dd58 100644
--- a/app/models/user_api_key_scope.rb
+++ b/app/models/user_api_key_scope.rb
@@ -17,7 +17,11 @@ class UserApiKeyScope < ActiveRecord::Base
   }
 
   def self.all_scopes
-    SCOPES
+    scopes = SCOPES
+    DiscoursePluginRegistry.user_api_key_scope_mappings.each do |mapping|
+      scopes = scopes.merge!(mapping)
+    end
+    scopes
   end
 
   def permits?(env)
diff --git a/lib/discourse_plugin_registry.rb b/lib/discourse_plugin_registry.rb
index 9e87e1374d9..39e00ca3a6e 100644
--- a/lib/discourse_plugin_registry.rb
+++ b/lib/discourse_plugin_registry.rb
@@ -81,6 +81,7 @@ class DiscoursePluginRegistry
 
   define_filtered_register :api_parameter_routes
   define_filtered_register :api_key_scope_mappings
+  define_filtered_register :user_api_key_scope_mappings
 
   define_filtered_register :permitted_bulk_action_parameters
 
diff --git a/lib/plugin/instance.rb b/lib/plugin/instance.rb
index 6745cbf22e7..0f0dc1d2291 100644
--- a/lib/plugin/instance.rb
+++ b/lib/plugin/instance.rb
@@ -793,6 +793,35 @@ class Plugin::Instance
     DiscoursePluginRegistry.register_api_key_scope_mapping({ resource => action }, self)
   end
 
+  # Register a new UserApiKey scope, and its allowed routes. Scope will be prefixed
+  # with the (parametetized) plugin name followed by a colon.
+  #
+  # For example, if discourse-awesome-plugin registered this:
+  #
+  # add_user_api_key_scope(:read_my_route,
+  #   methods: :get,
+  #   actions: "mycontroller#myaction",
+  #   formats: :ics,
+  #   parameters: :testparam
+  # )
+  #
+  # The scope registered would be `discourse-awesome-plugin:read_my_route`
+  #
+  # Multiple matchers can be attached by supplying an array of parameter hashes
+  #
+  # See UserApiKeyScope::SCOPES for more examples
+  # And lib/route_matcher.rb for the route matching logic
+  def add_user_api_key_scope(scope_name, matcher_parameters)
+    raise ArgumentError.new("scope_name must be a symbol") if !scope_name.is_a?(Symbol)
+    matcher_parameters = [matcher_parameters] if !matcher_parameters.is_a?(Array)
+
+    prefixed_scope_name = :"#{(name || directory_name).parameterize}:#{scope_name}"
+    DiscoursePluginRegistry.register_user_api_key_scope_mapping(
+      {
+        prefixed_scope_name => matcher_parameters&.map { |m| RouteMatcher.new(**m) }
+      }, self)
+  end
+
   # Register a route which can be authenticated using an api key or user api key
   # in a query parameter rather than a header. For example:
   #
diff --git a/spec/fabricators/user_api_key_fabricator.rb b/spec/fabricators/user_api_key_fabricator.rb
index 5d9fe484398..3ca55431c8e 100644
--- a/spec/fabricators/user_api_key_fabricator.rb
+++ b/spec/fabricators/user_api_key_fabricator.rb
@@ -1,17 +1,17 @@
 # frozen_string_literal: true
 
+Fabricator(:user_api_key) do
+  user
+  client_id { SecureRandom.hex }
+  application_name 'some app'
+end
+
 Fabricator(:user_api_key_scope)
 
 Fabricator(:readonly_user_api_key, from: :user_api_key) do
-  user
   scopes { [Fabricate.build(:user_api_key_scope, name: 'read')] }
-  client_id { SecureRandom.hex }
-  application_name 'some app'
 end
 
 Fabricator(:bookmarks_calendar_user_api_key, from: :user_api_key) do
-  user
   scopes { [Fabricate.build(:user_api_key_scope, name: 'bookmarks_calendar')] }
-  client_id { SecureRandom.hex }
-  application_name 'some app'
 end
diff --git a/spec/integration/api_keys_spec.rb b/spec/integration/api_keys_spec.rb
index db6d9052b9c..0e8d7249b05 100644
--- a/spec/integration/api_keys_spec.rb
+++ b/spec/integration/api_keys_spec.rb
@@ -128,4 +128,24 @@ describe 'user api keys' do
     expect(response.status).to eq(200) # Can access own calendar
   end
 
+  context "with a plugin registered user api key scope" do
+    let(:user_api_key) { Fabricate(:user_api_key) }
+
+    before do
+      metadata = Plugin::Metadata.new
+      metadata.name = "My Amazing Plugin"
+      plugin = Plugin::Instance.new metadata
+      plugin.add_user_api_key_scope :my_magic_scope, methods: :get, actions: "session#current"
+      user_api_key.scopes = [UserApiKeyScope.new(name: "my-amazing-plugin:my_magic_scope")]
+      user_api_key.save!
+    end
+
+    it 'allows parameter access to the registered route' do
+      get '/session/current.json', headers: {
+        HTTP_USER_API_KEY: user_api_key.key
+      }
+      expect(response.status).to eq(200)
+    end
+  end
+
 end