diff --git a/src/SmartTransactionsController.test.ts b/src/SmartTransactionsController.test.ts
index fab1a26c..bcb2b7c9 100644
--- a/src/SmartTransactionsController.test.ts
+++ b/src/SmartTransactionsController.test.ts
@@ -722,6 +722,105 @@ describe('SmartTransactionsController', () => {
         expect(submittedSmartTransaction.deviceModel).toBe('ledger');
       });
     });
+
+    it('submits a batch of signed transactions', async () => {
+      await withController(async ({ controller }) => {
+        const signedTransaction1 = createSignedTransaction();
+        const signedTransaction2 = createSignedTransaction();
+        const submitTransactionsApiResponse =
+          createSubmitTransactionsApiResponse(); // It has uuid.
+        nock(API_BASE_URL)
+          .post(
+            `/networks/${ethereumChainIdDec}/submitTransactions?stxControllerVersion=${packageJson.version}`,
+          )
+          .reply(200, submitTransactionsApiResponse);
+
+        const txParams = createTxParams();
+        const result = await controller.submitSignedTransactions({
+          signedTransactions: [signedTransaction1, signedTransaction2],
+          txParams,
+        });
+
+        // Check response has both txHash and txHashes
+        expect(result.uuid).toBe('dP23W7c2kt4FK9TmXOkz1UM2F20');
+        expect(result.txHash).toBeDefined();
+        expect(result.txHashes).toBeDefined();
+        expect(result.txHashes?.length).toBe(2);
+
+        // Check smart transaction has correct properties
+        const submittedSmartTransaction =
+          controller.state.smartTransactionsState.smartTransactions[
+            ChainId.mainnet
+          ][0];
+        expect(submittedSmartTransaction.uuid).toBe(
+          'dP23W7c2kt4FK9TmXOkz1UM2F20',
+        );
+        expect(submittedSmartTransaction.txHashes).toBeDefined();
+        expect(submittedSmartTransaction.txHashes?.length).toBe(2);
+        expect(submittedSmartTransaction.txHash).toBe(result.txHashes[0]);
+      });
+    });
+
+    it('works with optional signedCanceledTransactions', async () => {
+      await withController(async ({ controller }) => {
+        const signedTransaction = createSignedTransaction();
+        const submitTransactionsApiResponse =
+          createSubmitTransactionsApiResponse();
+
+        // Verify that the request body has empty rawCancelTxs array when signedCanceledTransactions is omitted
+        let requestBody: any;
+        nock(API_BASE_URL)
+          .post(
+            `/networks/${ethereumChainIdDec}/submitTransactions?stxControllerVersion=${packageJson.version}`,
+            (body) => {
+              requestBody = body;
+              return true;
+            },
+          )
+          .reply(200, submitTransactionsApiResponse);
+
+        await controller.submitSignedTransactions({
+          signedTransactions: [signedTransaction],
+          txParams: createTxParams(),
+          // No signedCanceledTransactions provided
+        });
+
+        // Verify the request was made with an empty rawCancelTxs array
+        expect(requestBody).toBeDefined();
+        expect(requestBody.rawCancelTxs).toStrictEqual([]);
+      });
+    });
+
+    it('works without txParams', async () => {
+      await withController(async ({ controller }) => {
+        const signedTransaction = createSignedTransaction();
+        const submitTransactionsApiResponse =
+          createSubmitTransactionsApiResponse();
+
+        nock(API_BASE_URL)
+          .post(
+            `/networks/${ethereumChainIdDec}/submitTransactions?stxControllerVersion=${packageJson.version}`,
+          )
+          .reply(200, submitTransactionsApiResponse);
+
+        // This should not throw an error when txParams is missing
+        const result = await controller.submitSignedTransactions({
+          signedTransactions: [signedTransaction],
+          // No txParams provided
+        });
+
+        expect(result.uuid).toBe('dP23W7c2kt4FK9TmXOkz1UM2F20');
+
+        // The transaction should still be created in state
+        const submittedSmartTransaction =
+          controller.state.smartTransactionsState.smartTransactions[
+            ChainId.mainnet
+          ][0];
+        expect(submittedSmartTransaction.uuid).toBe(
+          'dP23W7c2kt4FK9TmXOkz1UM2F20',
+        );
+      });
+    });
   });
 
   describe('fetchSmartTransactionsStatus', () => {
diff --git a/src/SmartTransactionsController.ts b/src/SmartTransactionsController.ts
index e24d45f6..ac3aa45f 100644
--- a/src/SmartTransactionsController.ts
+++ b/src/SmartTransactionsController.ts
@@ -916,11 +916,11 @@ export default class SmartTransactionsController extends StaticIntervalPollingCo
     transactionMeta,
     txParams,
     signedTransactions,
-    signedCanceledTransactions,
+    signedCanceledTransactions = [],
     networkClientId,
   }: {
     signedTransactions: SignedTransaction[];
-    signedCanceledTransactions: SignedCanceledTransaction[];
+    signedCanceledTransactions?: SignedCanceledTransaction[];
     transactionMeta?: TransactionMeta;
     txParams?: TransactionParams;
     networkClientId?: NetworkClientId;
@@ -948,10 +948,12 @@ export default class SmartTransactionsController extends StaticIntervalPollingCo
     const time = Date.now();
     let preTxBalance;
     try {
-      const preTxBalanceBN = await query(ethQuery, 'getBalance', [
-        txParams?.from,
-      ]);
-      preTxBalance = new BigNumber(preTxBalanceBN).toString(16);
+      if (txParams?.from) {
+        const preTxBalanceBN = await query(ethQuery, 'getBalance', [
+          txParams.from,
+        ]);
+        preTxBalance = new BigNumber(preTxBalanceBN).toString(16);
+      }
     } catch (error) {
       console.error('provider error', error);
     }
@@ -970,9 +972,12 @@ export default class SmartTransactionsController extends StaticIntervalPollingCo
       nonceDetails = nonceLock.nonceDetails;
       txParams.nonce ??= nonce;
     }
+
+    const txHashes = signedTransactions.map((tx) => getTxHash(tx));
     const submitTransactionResponse = {
       ...data,
-      txHash: getTxHash(signedTransactions[0]),
+      txHash: txHashes[0], // For backward compatibility
+      txHashes,
     };
 
     try {
@@ -990,6 +995,7 @@ export default class SmartTransactionsController extends StaticIntervalPollingCo
           type: transactionMeta?.type ?? 'swap',
           transactionId: transactionMeta?.id,
           networkClientId: selectedNetworkClientId,
+          txHashes, // Add support for multiple transaction hashes
         },
         { chainId, ethQuery },
       );
diff --git a/src/types.ts b/src/types.ts
index 1c48ba61..dceecf55 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -73,6 +73,7 @@ export type SmartTransactionsStatus = {
 export type SmartTransaction = {
   uuid: string;
   txHash?: string;
+  txHashes?: string[];
   chainId?: string;
   destinationTokenAddress?: string;
   destinationTokenDecimals?: string;