diff --git a/das_api/src/api/api_impl.rs b/das_api/src/api/api_impl.rs
index 998d4a5e6..5b98c1340 100644
--- a/das_api/src/api/api_impl.rs
+++ b/das_api/src/api/api_impl.rs
@@ -295,6 +295,7 @@ impl ApiContract for DasApi {
         });
         let owner_address = validate_opt_pubkey(&owner_address)?;
         let creator_address = validate_opt_pubkey(&creator_address)?;
+        let delegate = validate_opt_pubkey(&delegate)?;
 
         let authority_address = validate_opt_pubkey(&authority_address)?;
         let supply_mint = validate_opt_pubkey(&supply_mint)?;
diff --git a/das_api/src/api/mod.rs b/das_api/src/api/mod.rs
index 1e49d67f8..788c2adf2 100644
--- a/das_api/src/api/mod.rs
+++ b/das_api/src/api/mod.rs
@@ -70,7 +70,7 @@ pub struct SearchAssets {
     pub creator_verified: Option<bool>,
     pub authority_address: Option<String>,
     pub grouping: Option<(String, String)>,
-    pub delegate: Option<Vec<u8>>,
+    pub delegate: Option<String>,
     pub frozen: Option<bool>,
     pub supply: Option<u64>,
     pub supply_mint: Option<String>,