diff --git a/lib/ckb/api.rb b/lib/ckb/api.rb
index deb3fbac..3f379eda 100644
--- a/lib/ckb/api.rb
+++ b/lib/ckb/api.rb
@@ -152,8 +152,10 @@ def get_live_cell(out_point, with_data = false)
     # @param transaction [CKB::Types::Transaction]
     #
     # @return [String] tx_hash
-    def send_transaction(transaction)
-      rpc.send_transaction(transaction.to_raw_transaction_h)
+    def send_transaction(transaction, outputs_validator = "default")
+      raise ArgumentError, "Invalid outputs_validator, outputs_validator should be `default` or `passthrough`" unless %w(default passthrough).include?(outputs_validator)
+
+      rpc.send_transaction(transaction.to_raw_transaction_h, outputs_validator)
     end
 
     def compute_transaction_hash(transaction)
diff --git a/lib/ckb/rpc.rb b/lib/ckb/rpc.rb
index 10a10f1e..e049a37c 100644
--- a/lib/ckb/rpc.rb
+++ b/lib/ckb/rpc.rb
@@ -73,8 +73,10 @@ def get_live_cell(out_point, with_data = false)
       rpc_request("get_live_cell", params: [out_point, with_data])
     end
 
-    def send_transaction(transaction)
-      rpc_request("send_transaction", params: [transaction])
+    def send_transaction(transaction, outputs_validator = "default")
+      raise ArgumentError, "Invalid outputs_validator, outputs_validator should be `default` or `passthrough`" unless %w(default passthrough).include?(outputs_validator)
+
+      rpc_request("send_transaction", params: [transaction, outputs_validator])
     end
 
     def local_node_info
diff --git a/lib/ckb/wallet.rb b/lib/ckb/wallet.rb
index 647f2b2e..2c5237ea 100644
--- a/lib/ckb/wallet.rb
+++ b/lib/ckb/wallet.rb
@@ -123,9 +123,9 @@ def generate_tx(target_address, capacity, data = "0x", key: nil, fee: 0, use_dep
     # @param data [String] "0x..."
     # @param key [CKB::Key | String] Key or private key hex string
     # @param fee [Integer] transaction fee, in shannon
-    def send_capacity(target_address, capacity, data = "0x", key: nil, fee: 0)
+    def send_capacity(target_address, capacity, data = "0x", key: nil, fee: 0, outputs_validator: "default")
       tx = generate_tx(target_address, capacity, data, key: key, fee: fee)
-      send_transaction(tx)
+      send_transaction(tx, outputs_validator)
     end
 
     # @param capacity [Integer]
@@ -360,8 +360,8 @@ def lock
     private
 
     # @param transaction [CKB::Transaction]
-    def send_transaction(transaction)
-      api.send_transaction(transaction)
+    def send_transaction(transaction, outputs_validator = "default")
+      api.send_transaction(transaction, outputs_validator)
     end
 
     # @param capacity [Integer]