diff --git a/hypersync/__init__.py b/hypersync/__init__.py
index e31a031..4c66522 100644
--- a/hypersync/__init__.py
+++ b/hypersync/__init__.py
@@ -580,8 +580,9 @@ class TransactionSelection:
     sighash: Optional[list[str]] = None
     # If transaction.status matches this value, the transaction will be returned.
     status: Optional[int] = None
-    # If transaction.type matches any of these values, the transaction will be returned
-    kind: Optional[list[str]] = None
+    # If transaction.type matches any of these values, the transaction will be returned.
+    # Values are EIP-2718 transaction-type bytes (e.g. 0 legacy, 2 EIP-1559, 4 EIP-7702).
+    kind: Optional[list[int]] = None
     # If transaction.contract_address matches any of these values, the transaction will be returned.
     contract_address: Optional[list[str]] = None
     # If transaction.hash matches any of these values the transaction will be returned.
diff --git a/src/query.rs b/src/query.rs
index 4f32ac4..2de1bf3 100644
--- a/src/query.rs
+++ b/src/query.rs
@@ -56,7 +56,7 @@ pub struct TransactionSelection {
     pub status: Option<u64>,
     #[serde(skip_serializing_if = "Option::is_none")]
     #[serde(rename = "type")]
-    pub kind: Option<Vec<String>>,
+    pub kind: Option<Vec<u8>>,
     #[serde(skip_serializing_if = "Option::is_none")]
     pub contract_address: Option<Vec<String>>,
     #[serde(skip_serializing_if = "Option::is_none")]