diff --git a/explorer/src/service/api.rs b/explorer/src/service/api.rs
index 957ae1d..785ba19 100644
--- a/explorer/src/service/api.rs
+++ b/explorer/src/service/api.rs
@@ -793,7 +793,7 @@ impl Api {
     )]
     async fn v2_get_delegations(
         &self,
-        address: Query<String>,
+        address: Query<Option<String>>,
         page: Query<Option<i64>>,
         page_size: Query<Option<i64>>,
     ) -> poem::Result<V2DelegationsResponse> {
diff --git a/explorer/src/service/v2/delegation.rs b/explorer/src/service/v2/delegation.rs
index 3b96540..bdbf076 100644
--- a/explorer/src/service/v2/delegation.rs
+++ b/explorer/src/service/v2/delegation.rs
@@ -102,25 +102,41 @@ pub struct V2DelegationTxsData {
 
 pub async fn v2_get_delegations(
     api: &Api,
-    address: Query<String>,
+    address: Query<Option<String>>,
     page: Query<Option<i64>>,
     page_size: Query<Option<i64>>,
 ) -> Result<V2DelegationsResponse> {
     let page = page.0.unwrap_or(1);
     let page_size = page_size.0.unwrap_or(10);
     let mut conn = api.storage.lock().await.acquire().await?;
-    let sql_count = format!(
-        "SELECT count(*) AS cnt FROM delegations WHERE sender='{}'",
-        address.0.to_lowercase()
-    );
+
+    let (sql_count, sql_query) = if let Some(addr) = address.0 {
+        (
+            format!(
+                "SELECT count(*) AS cnt FROM delegations WHERE sender='{}'",
+                addr.to_lowercase()
+            ),
+            format!(
+            "SELECT tx,block,sender,amount,validator,new_validator,timestamp,height,content FROM delegations WHERE sender='{}' ORDER BY timestamp DESC LIMIT {} OFFSET {}",
+            addr.to_lowercase(),
+            page_size,
+            (page - 1) * page_size
+        ),
+        )
+    } else {
+        (
+            "SELECT count(*) AS cnt FROM delegations".to_string(),
+            format!(
+            "SELECT tx,block,sender,amount,validator,new_validator,timestamp,height,content FROM delegations ORDER BY timestamp DESC LIMIT {} OFFSET {}",
+            page_size,
+            (page - 1) * page_size
+        ),
+        )
+    };
+
     let row_cnt = sqlx::query(sql_count.as_str()).fetch_one(&mut conn).await?;
     let total: i64 = row_cnt.try_get("cnt")?;
 
-    let sql_query = format!(
-        "SELECT tx,block,sender,amount,validator,new_validator,timestamp,height,content FROM delegations WHERE sender='{}' ORDER BY timestamp DESC LIMIT {} OFFSET {}",
-        address.0.to_lowercase(), page_size, (page-1)*page_size
-    );
-
     let mut res: Vec<V2Delegation> = vec![];
     let rows = sqlx::query(sql_query.as_str()).fetch_all(&mut conn).await?;
     for row in rows {