diff --git a/apps/hermes/server/src/api/rest/v2/latest_twaps.rs b/apps/hermes/server/src/api/rest/v2/latest_twaps.rs
index 34c10c81cd..7428ace909 100644
--- a/apps/hermes/server/src/api/rest/v2/latest_twaps.rs
+++ b/apps/hermes/server/src/api/rest/v2/latest_twaps.rs
@@ -131,22 +131,17 @@ where
     })?;
 
     let twap_update_data = twaps_with_update_data.update_data;
-    let binary: Vec<BinaryUpdate> = twap_update_data
+    let encoded_data = twap_update_data
         .into_iter()
-        .map(|data_vec| {
-            let encoded_data = data_vec
-                .into_iter()
-                .map(|data| match params.encoding {
-                    EncodingType::Base64 => base64_standard_engine.encode(data),
-                    EncodingType::Hex => hex::encode(data),
-                })
-                .collect();
-            BinaryUpdate {
-                encoding: params.encoding,
-                data: encoded_data,
-            }
+        .map(|data| match params.encoding {
+            EncodingType::Base64 => base64_standard_engine.encode(data),
+            EncodingType::Hex => hex::encode(data),
         })
         .collect();
+    let binary = BinaryUpdate {
+        encoding: params.encoding,
+        data: encoded_data,
+    };
 
     let parsed: Option<Vec<ParsedPriceFeedTwap>> = if params.parsed {
         Some(
diff --git a/apps/hermes/server/src/api/types.rs b/apps/hermes/server/src/api/types.rs
index cdb6124351..aa430773b5 100644
--- a/apps/hermes/server/src/api/types.rs
+++ b/apps/hermes/server/src/api/types.rs
@@ -281,9 +281,9 @@ impl From<PriceFeedTwap> for ParsedPriceFeedTwap {
 
 #[derive(Debug, Clone, Serialize, Deserialize, ToSchema)]
 pub struct TwapsResponse {
-    /// Each BinaryUpdate contains the start & end cumulative price updates used to
+    /// Contains the start & end cumulative price updates used to
     /// calculate a given price feed's TWAP.
-    pub binary: Vec<BinaryUpdate>,
+    pub binary: BinaryUpdate,
 
     /// The calculated TWAPs for each price ID
     #[serde(skip_serializing_if = "Option::is_none")]
diff --git a/apps/hermes/server/src/state/aggregate.rs b/apps/hermes/server/src/state/aggregate.rs
index 67cbfd18d4..43928b9dba 100644
--- a/apps/hermes/server/src/state/aggregate.rs
+++ b/apps/hermes/server/src/state/aggregate.rs
@@ -206,7 +206,7 @@ pub struct PublisherStakeCapsWithUpdateData {
 #[derive(Debug)]
 pub struct TwapsWithUpdateData {
     pub twaps: Vec<PriceFeedTwap>,
-    pub update_data: Vec<Vec<Vec<u8>>>,
+    pub update_data: Vec<Vec<u8>>,
 }
 
 #[derive(Debug, Serialize)]
@@ -688,12 +688,13 @@ where
     }
 
     // Construct update data.
-    // update_data[0] will contain the start VAA and merkle proofs
-    // update_data[1] will contain the end VAA and merkle proofs
-    let start_updates =
+    // update_data[0] contains the start VAA and merkle proofs
+    // update_data[1] contains the end VAA and merkle proofs
+    let mut update_data =
         construct_update_data(start_messages.into_iter().map(Into::into).collect())?;
-    let end_updates = construct_update_data(end_messages.into_iter().map(Into::into).collect())?;
-    let update_data = vec![start_updates, end_updates];
+    update_data.extend(construct_update_data(
+        end_messages.into_iter().map(Into::into).collect(),
+    )?);
 
     Ok(TwapsWithUpdateData { twaps, update_data })
 }
@@ -1307,10 +1308,8 @@ mod test {
         assert_eq!(twap_2.start_timestamp, 100);
         assert_eq!(twap_2.end_timestamp, 200);
 
-        // Each update_data element contains a VAA and merkle proofs for both feeds
+        // update_data should have 2 elements, one for the start block and one for the end block.
         assert_eq!(result.update_data.len(), 2);
-        assert_eq!(result.update_data[0].len(), 1); // Start update
-        assert_eq!(result.update_data[1].len(), 1); // End update
     }
     #[tokio::test]