diff --git a/Cargo.lock b/Cargo.lock
index fa87bec69f..70c1be67e9 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2264,6 +2264,7 @@ dependencies = [
  "solana-logger 0.14.0",
  "solana-metrics 0.14.0",
  "solana-netutil 0.14.0",
+ "solana-runtime 0.14.0",
  "solana-sdk 0.14.0",
  "untrusted 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "ws 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
diff --git a/bench-exchange/Cargo.toml b/bench-exchange/Cargo.toml
index 9d9afc2c02..73b8372863 100644
--- a/bench-exchange/Cargo.toml
+++ b/bench-exchange/Cargo.toml
@@ -29,6 +29,7 @@ solana-exchange-program = { path = "../programs/exchange_program", version = "0.
 solana-logger = { path = "../logger", version = "0.14.0" }
 solana-metrics = { path = "../metrics", version = "0.14.0" }
 solana-netutil = { path = "../netutil", version = "0.14.0" }
+solana-runtime = { path = "../runtime", version = "0.14.0" }
 solana-sdk = { path = "../sdk", version = "0.14.0" }
 ws = "0.8.0"
 untrusted = "0.6.2"
diff --git a/bench-exchange/src/bench.rs b/bench-exchange/src/bench.rs
index 5ca4f533a7..b5d2d0cab3 100644
--- a/bench-exchange/src/bench.rs
+++ b/bench-exchange/src/bench.rs
@@ -1017,6 +1017,10 @@ mod tests {
     use solana::local_cluster::{ClusterConfig, LocalCluster};
     use solana_client::thin_client::create_client;
     use solana_drone::drone::run_local_drone;
+    use solana_exchange_api::exchange_processor::process_instruction;
+    use solana_runtime::bank::Bank;
+    use solana_runtime::bank_client::BankClient;
+    use solana_sdk::genesis_block::GenesisBlock;
     use std::sync::mpsc::channel;
 
     #[test]
@@ -1046,11 +1050,7 @@ mod tests {
             node_stakes: vec![100_000; NUM_NODES],
             cluster_lamports: 100_000_000_000_000,
             fullnode_config,
-            native_instruction_processors: [(
-                "solana_exchange_program".to_string(),
-                solana_exchange_api::id(),
-            )]
-            .to_vec(),
+            native_instruction_processors: [("solana_exchange_program".to_string(), id())].to_vec(),
             ..ClusterConfig::default()
         });
 
@@ -1105,4 +1105,24 @@ mod tests {
 
         do_bench_exchange(clients, config);
     }
+
+    #[test]
+    fn test_exchange_bank_client() {
+        solana_logger::setup();
+        let (genesis_block, identity) = GenesisBlock::new(100_000_000_000_000);
+        let mut bank = Bank::new(&genesis_block);
+        bank.add_instruction_processor(id(), process_instruction);
+        let clients = vec![BankClient::new(bank)];
+
+        let mut config = Config::default();
+        config.identity = identity;
+        config.threads = 4;
+        config.duration = Duration::from_secs(5);
+        config.fund_amount = 100_000;
+        config.trade_delay = 1;
+        config.batch_size = 10;
+        config.account_groups = 100;
+
+        do_bench_exchange(clients, config);
+    }
 }
diff --git a/runtime/src/bank.rs b/runtime/src/bank.rs
index 3fca1065e1..875dd58735 100644
--- a/runtime/src/bank.rs
+++ b/runtime/src/bank.rs
@@ -1013,7 +1013,7 @@ impl Bank {
         self.is_delta.load(Ordering::Relaxed) && self.tick_height() == max_tick_height
     }
 
-    /// Add an instruction processor to intercept intructions before the dynamic loader.
+    /// Add an instruction processor to intercept instructions before the dynamic loader.
     pub fn add_instruction_processor(
         &mut self,
         program_id: Pubkey,
diff --git a/runtime/src/bank_client.rs b/runtime/src/bank_client.rs
index 78f4a34bce..82aec90bd8 100644
--- a/runtime/src/bank_client.rs
+++ b/runtime/src/bank_client.rs
@@ -12,11 +12,12 @@ use solana_sdk::transport::Result;
 use std::io;
 use std::sync::mpsc::{channel, Receiver, Sender};
 use std::sync::Arc;
+use std::sync::Mutex;
 use std::thread::Builder;
 
 pub struct BankClient {
     bank: Arc<Bank>,
-    transaction_sender: Sender<Transaction>,
+    transaction_sender: Mutex<Sender<Transaction>>,
 }
 
 impl Client for BankClient {}
@@ -24,7 +25,8 @@ impl Client for BankClient {}
 impl AsyncClient for BankClient {
     fn async_send_transaction(&self, transaction: Transaction) -> io::Result<Signature> {
         let signature = transaction.signatures.get(0).cloned().unwrap_or_default();
-        self.transaction_sender.send(transaction).unwrap();
+        let transaction_sender = self.transaction_sender.lock().unwrap();
+        transaction_sender.send(transaction).unwrap();
         Ok(signature)
     }
 
@@ -122,6 +124,7 @@ impl BankClient {
     pub fn new(bank: Bank) -> Self {
         let bank = Arc::new(bank);
         let (transaction_sender, transaction_receiver) = channel();
+        let transaction_sender = Mutex::new(transaction_sender);
         let thread_bank = bank.clone();
         let bank = bank.clone();
         Builder::new()