diff --git a/app/serializers/tournament_serializer.rb b/app/serializers/tournament_serializer.rb
index 26e817a..a01caf1 100644
--- a/app/serializers/tournament_serializer.rb
+++ b/app/serializers/tournament_serializer.rb
@@ -2,8 +2,10 @@
 
 class TournamentSerializer < SimpleTournamentSerializer
   attributes :description, :playoff_teams_amount,
-             :instant_finalists_amount, :intermediate_round_participants_amount,
-             :read_only_mode, :sync_target_url, :sync_last_push_error
+             :instant_finalists_amount, :intermediate_round_participants_amount
+  attribute :read_only_mode, if: :sync_metadata_visible?
+  attribute :sync_target_url, if: :sync_metadata_visible?
+  attribute :sync_last_push_error, if: :sync_metadata_visible?
              # NEVER expose sync_auth_token anywhere - it should only ever be written to or checked against
 
   has_many :stages
@@ -12,7 +14,7 @@ class TournamentSerializer < SimpleTournamentSerializer
     object.timer_end&.iso8601
   end
 
-  attribute :sync_last_pushed_at do
+  attribute :sync_last_pushed_at, if: :sync_metadata_visible? do
     object.sync_last_pushed_at&.iso8601
   end
 
@@ -30,4 +32,8 @@ class TournamentSerializer < SimpleTournamentSerializer
       }
     end
   end
+
+  def sync_metadata_visible?
+    scope.present? && scope == object.owner
+  end
 end
diff --git a/spec/controllers/tournaments_controller_spec.rb b/spec/controllers/tournaments_controller_spec.rb
index 9bc9c39..4f53e0a 100644
--- a/spec/controllers/tournaments_controller_spec.rb
+++ b/spec/controllers/tournaments_controller_spec.rb
@@ -103,21 +103,21 @@ RSpec.describe TournamentsController, type: :controller do
       json = deserialize_response(response)
       expect(json[:id].to_i).to eq(@tournament.id)
       expected_keys = %i[
-        id name code public description playoff_teams_amount instant_finalists_amount
-        intermediate_round_participants_amount read_only_mode sync_target_url
-        sync_last_push_error sync_last_pushed_at timer_end owner_username stages teams
+        id name code public description playoff_teams_amount
+        instant_finalists_amount intermediate_round_participants_amount
+        timer_end owner_username stages teams
       ]
       expect(json.keys).to match_array(expected_keys)
-      expect(json).to eq(TournamentSerializer.new(@tournament).as_json)
       expect(json[:name]).to eq(@tournament.name)
       expect(json[:description]).to eq(@tournament.description)
       expect(json[:public]).to eq(@tournament.public)
     end
 
-    it 'returns sync metadata on full tournament payload' do
+    it 'does not return sync metadata on unauthenticated requests' do
       pushed_at = Time.utc(2026, 4, 20, 12, 0, 0)
       @tournament.update!(
         read_only_mode: true,
+        sync_target_url: 'https://remote.example.com/tournaments/1/sync_state',
         sync_auth_token: 'shared-secret',
         sync_last_pushed_at: pushed_at,
         sync_last_push_error: 'push failed'
@@ -125,11 +125,34 @@ RSpec.describe TournamentsController, type: :controller do
 
       get :show, params: { id: @tournament.to_param }
 
+      json = deserialize_response(response)
+      expect(json).not_to have_key(:read_only_mode)
+      expect(json).not_to have_key(:sync_target_url)
+      expect(json).not_to have_key(:sync_last_pushed_at)
+      expect(json).not_to have_key(:sync_last_push_error)
+      expect(json).not_to have_key(:sync_auth_token)
+    end
+
+    it 'returns sync metadata to owner requests' do
+      pushed_at = Time.utc(2026, 4, 20, 12, 0, 0)
+      @tournament.update!(
+        read_only_mode: true,
+        sync_target_url: 'https://remote.example.com/tournaments/1/sync_state',
+        sync_auth_token: 'shared-secret',
+        sync_last_pushed_at: pushed_at,
+        sync_last_push_error: 'push failed'
+      )
+      apply_authentication_headers_for @tournament.owner
+
+      get :show, params: { id: @tournament.to_param }
+
       json = deserialize_response(response)
       expect(json[:read_only_mode]).to eq(true)
+      expect(json[:sync_target_url]).to eq('https://remote.example.com/tournaments/1/sync_state')
       expect(json[:sync_last_pushed_at]).to eq(pushed_at.iso8601)
       expect(json[:sync_last_push_error]).to eq('push failed')
       expect(json).not_to have_key(:sync_auth_token)
+      expect(json).to eq(TournamentSerializer.new(@tournament, scope: @tournament.owner).as_json)
     end
 
     context 'with simple=true parameter' do