diff --git a/src/clob/types/response.rs b/src/clob/types/response.rs
index 2dbd1785..6509994b 100644
--- a/src/clob/types/response.rs
+++ b/src/clob/types/response.rs
@@ -651,12 +651,14 @@ pub struct BuilderApiKeyResponse {
 pub struct BuilderTradeResponse {
     pub id: String,
     pub trade_type: String,
-    /// Hash of the taker order.
-    pub taker_order_hash: B256,
-    /// Address of the builder.
-    pub builder: Address,
-    /// The market condition ID.
-    pub market: B256,
+    /// Hash of the taker order (optional — may be empty for pending trades).
+    #[serde(default)]
+    pub taker_order_hash: Option<B256>,
+    /// Builder API key ID (UUID, not an Ethereum address).
+    pub builder: ApiKey,
+    /// The market condition ID (optional — may be empty in some API responses).
+    #[serde(default)]
+    pub market: Option<B256>,
     pub asset_id: U256,
     pub side: Side,
     pub size: Decimal,
@@ -668,8 +670,9 @@ pub struct BuilderTradeResponse {
     pub owner: ApiKey,
     /// Address of the maker.
     pub maker: Address,
-    /// On-chain transaction hash.
-    pub transaction_hash: B256,
+    /// On-chain transaction hash (optional — empty for unfilled/pending trades).
+    #[serde(default)]
+    pub transaction_hash: Option<B256>,
     #[serde_as(as = "TimestampSeconds<String>")]
     pub match_time: DateTime<Utc>,
     pub bucket_index: u32,