diff --git a/app/controllers/api/v1/registrant/contacts_controller.rb b/app/controllers/api/v1/registrant/contacts_controller.rb
index 10f9abacf..e11458ff8 100644
--- a/app/controllers/api/v1/registrant/contacts_controller.rb
+++ b/app/controllers/api/v1/registrant/contacts_controller.rb
@@ -19,15 +19,16 @@ module Api
           end
 
           contacts = current_user_contacts.limit(limit).offset(offset)
-          serialized_contacts = contacts.collect { |contact| serialize_contact(contact) }
+          serialized_contacts = contacts.collect { |contact| serialize_contact(contact, false) }
           render json: serialized_contacts
         end
 
         def show
           contact = current_user_contacts.find_by(uuid: params[:uuid])
+          links = params[:links] == 'true'
 
           if contact
-            render json: serialize_contact(contact)
+            render json: serialize_contact(contact, links)
           else
             render json: { errors: [{ base: ['Contact not found'] }] }, status: :not_found
           end
@@ -85,7 +86,7 @@ module Api
             contact.registrar.notify(action)
           end
 
-          render json: serialize_contact(contact)
+          render json: serialize_contact(contact, false)
         end
 
         private
@@ -96,8 +97,8 @@ module Api
           current_registrant_user.direct_contacts
         end
 
-        def serialize_contact(contact)
-          Serializers::RegistrantApi::Contact.new(contact).to_json
+        def serialize_contact(contact, links)
+          Serializers::RegistrantApi::Contact.new(contact, links).to_json
         end
       end
     end
diff --git a/app/models/contact.rb b/app/models/contact.rb
index 8a154c50c..e30312b4a 100644
--- a/app/models/contact.rb
+++ b/app/models/contact.rb
@@ -347,19 +347,24 @@ class Contact < ApplicationRecord
     @desc = {}
 
     registrant_domains.each do |dom|
-      @desc[dom.name] ||= []
-      @desc[dom.name] << :registrant
+      @desc[dom.name] ||= { id: dom.uuid, roles: [] }
+      @desc[dom.name][:roles] << :registrant
     end
 
     domain_contacts.each do |dc|
-      @desc[dc.domain.name] ||= []
-      @desc[dc.domain.name] << dc.name.downcase.to_sym
+      @desc[dc.domain.name] ||= { id: dc.domain.uuid, roles: [] }
+      @desc[dc.domain.name][:roles] << dc.name.downcase.to_sym
       @desc[dc.domain.name] = @desc[dc.domain.name].compact
     end
 
     @desc
   end
 
+  def related_domains
+    a = related_domain_descriptions
+    a.keys.map { |d| { name: d, id: a[d][:id], roles: a[d][:roles] } }
+  end
+
   def status_notes_array=(notes)
     self.status_notes = {}
     notes ||= []
diff --git a/lib/serializers/registrant_api/contact.rb b/lib/serializers/registrant_api/contact.rb
index dd36b4400..023544174 100644
--- a/lib/serializers/registrant_api/contact.rb
+++ b/lib/serializers/registrant_api/contact.rb
@@ -1,14 +1,15 @@
 module Serializers
   module RegistrantApi
     class Contact
-      attr_reader :contact
+      attr_reader :contact, :links
 
-      def initialize(contact)
+      def initialize(contact, links)
         @contact = contact
+        @links = links
       end
 
-      def to_json
-        {
+      def to_json(_obj = nil)
+        obj = {
           id: contact.uuid,
           name: contact.name,
           code: contact.code,
@@ -31,6 +32,10 @@ module Serializers
           statuses: contact.statuses,
           disclosed_attributes: contact.disclosed_attributes,
         }
+
+        obj[:links] = contact.related_domains if @links
+
+        obj
       end
     end
   end
diff --git a/lib/serializers/registrant_api/domain.rb b/lib/serializers/registrant_api/domain.rb
index f8d5bb830..2359d77c9 100644
--- a/lib/serializers/registrant_api/domain.rb
+++ b/lib/serializers/registrant_api/domain.rb
@@ -58,7 +58,8 @@ module Serializers
           valid_to: domain.valid_to, outzone_at: domain.outzone_at, statuses: domain.statuses,
           registrant_verification_asked_at: domain.registrant_verification_asked_at,
           registrar: { name: domain.registrar.name, website: domain.registrar.website },
-          registrant: { name: domain.registrant.name, id: domain.registrant.uuid }
+          registrant: { name: domain.registrant.name, id: domain.registrant.uuid,
+                        phone: domain.registrant.phone, email: domain.registrant.email }
         }
       end