diff --git a/bdledger/api/query.proto b/bdledger/api/query.proto
index 286fe9a..3730fd1 100644
--- a/bdledger/api/query.proto
+++ b/bdledger/api/query.proto
@@ -54,6 +54,8 @@ message GetBlocksResponse {
 }
 message CountBlocksResponse {
   uint64 count = 1;
+  int64 start_timestamp = 2;
+  int64 end_timestamp = 3;
 }
 
 message GetTransactionByHashRequest {
@@ -86,4 +88,6 @@ message GetTransactionsResponse {
 }
 message CountTransactionsResponse {
   uint64 count = 1;
+  int64 start_timestamp = 2;
+  int64 end_timestamp = 3;
 }