diff --git a/app/models/udt.rb b/app/models/udt.rb
index 5f10557e0..136a932e6 100644
--- a/app/models/udt.rb
+++ b/app/models/udt.rb
@@ -42,6 +42,10 @@ def type_script
       hash_type:,
     }
   end
+
+  def holders_count
+    udt_holder_allocations.sum("ckb_holder_count + btc_holder_count")
+  end
 end
 
 # == Schema Information
diff --git a/app/serializers/udt_serializer.rb b/app/serializers/udt_serializer.rb
index 49ee340d0..3730e68a4 100644
--- a/app/serializers/udt_serializer.rb
+++ b/app/serializers/udt_serializer.rb
@@ -22,9 +22,12 @@ class UdtSerializer
   attribute :h24_ckb_transactions_count do |object|
     object.h24_ckb_transactions_count.to_s
   end
-  attributes :created_at do |object|
+  attribute :created_at do |object|
     object.block_timestamp.to_s
   end
+  attribute :holder do |object|
+    object.holders_count.to_s
+  end
 
   attribute :mint_status, if: Proc.new { |record, _params|
     record.udt_type == "omiga_inscription"
diff --git a/test/controllers/api/v1/omiga_inscriptions_controller_test.rb b/test/controllers/api/v1/omiga_inscriptions_controller_test.rb
index dde4b207e..faf015653 100644
--- a/test/controllers/api/v1/omiga_inscriptions_controller_test.rb
+++ b/test/controllers/api/v1/omiga_inscriptions_controller_test.rb
@@ -72,7 +72,7 @@ class OmigaInscriptionsControllerTest < ActionDispatch::IntegrationTest
         assert_equal %w(
           symbol full_name total_amount addresses_count
           decimal icon_file h24_ckb_transactions_count created_at description
-          published type_hash type_script issuer_address mint_status mint_limit expected_supply
+          published type_hash type_script issuer_address mint_status mint_limit expected_supply holder
           inscription_info_id udt_type pre_udt_hash info_type_hash operator_website email is_repeated_symbol
         ).sort,
                      response_udt["attributes"].keys.sort
@@ -86,7 +86,7 @@ class OmigaInscriptionsControllerTest < ActionDispatch::IntegrationTest
         response_udt = json["data"]
         assert_equal %w(
           symbol full_name total_amount addresses_count
-          decimal icon_file h24_ckb_transactions_count created_at description
+          decimal icon_file h24_ckb_transactions_count created_at description holder
           published type_hash type_script issuer_address mint_status mint_limit expected_supply inscription_info_id
           udt_type pre_udt_hash info_type_hash operator_website email is_repeated_symbol
         ).sort,
diff --git a/test/controllers/api/v1/udts_controller_test.rb b/test/controllers/api/v1/udts_controller_test.rb
index bd742fa68..c294a9802 100644
--- a/test/controllers/api/v1/udts_controller_test.rb
+++ b/test/controllers/api/v1/udts_controller_test.rb
@@ -120,7 +120,7 @@ class UdtsControllerTest < ActionDispatch::IntegrationTest
 
         response_tx_transaction = json["data"]
         assert_equal %w(
-          symbol full_name total_amount addresses_count
+          symbol full_name total_amount addresses_count holder
           decimal icon_file h24_ckb_transactions_count created_at description
           published type_hash type_script issuer_address udt_type operator_website email
         ).sort,