diff --git a/app/controllers/concerns/cell_data_comparator.rb b/app/controllers/concerns/cell_data_comparator.rb
index fb518d30c..3551de378 100644
--- a/app/controllers/concerns/cell_data_comparator.rb
+++ b/app/controllers/concerns/cell_data_comparator.rb
@@ -69,7 +69,7 @@ def diff_udt_cells(inputs, outputs)
 
       amount = output&.dig(:amount).to_f - input&.dig(:amount).to_f
       capacity = output&.dig(:capacity).to_f - input&.dig(:capacity).to_f
-      udt_info = udt_infos[k[1]].merge(amount:)
+      udt_info = udt_infos[k[1]].merge(amount: "%f" % amount)
       transfers[k[0]] << CkbUtils.hash_value_to_s({ capacity:, cell_type: k[2], udt_info: })
     end
 
diff --git a/test/controllers/api/v2/ckb_transactions_controller_test.rb b/test/controllers/api/v2/ckb_transactions_controller_test.rb
index f73564bc6..efda76515 100644
--- a/test/controllers/api/v2/ckb_transactions_controller_test.rb
+++ b/test/controllers/api/v2/ckb_transactions_controller_test.rb
@@ -36,13 +36,13 @@ class CkbTransactionsControllerTest < ActionDispatch::IntegrationTest
                             block: block2,
                             previous_output: {
                               tx_hash: tx1.tx_hash,
-                              index: 0
+                              index: 0,
                             })
         create(:cell_input, ckb_transaction: tx2,
                             block: block2,
                             previous_output: {
                               tx_hash: tx1.tx_hash,
-                              index: 1
+                              index: 1,
                             })
         # create outputs
         create(:cell_output, ckb_transaction: tx2,
@@ -107,13 +107,13 @@ class CkbTransactionsControllerTest < ActionDispatch::IntegrationTest
                             block: block2,
                             previous_output: {
                               tx_hash: tx1.tx_hash,
-                              index: 0
+                              index: 0,
                             })
         create(:cell_input, ckb_transaction: tx2,
                             block: block2,
                             previous_output: {
                               tx_hash: tx1.tx_hash,
-                              index: 1
+                              index: 1,
                             })
         # create outputs
         create(:cell_output, ckb_transaction: tx2,
@@ -141,8 +141,8 @@ class CkbTransactionsControllerTest < ActionDispatch::IntegrationTest
         transfers2 = data2[0]["transfers"]
 
         assert_equal 2, json["data"].size
-        assert_equal "-2000000000000.0", transfers1[0]["udt_info"]["amount"]
-        assert_equal "2000000000000.0", transfers2[0]["udt_info"]["amount"]
+        assert_equal "-2000000000000.000000", transfers1[0]["udt_info"]["amount"]
+        assert_equal "2000000000000.000000", transfers2[0]["udt_info"]["amount"]
       end
     end
   end