diff --git a/packages/wallet/src/guardian/index.test.ts b/packages/wallet/src/guardian/index.test.ts
index 12fe0799d1..a12114aa2c 100644
--- a/packages/wallet/src/guardian/index.test.ts
+++ b/packages/wallet/src/guardian/index.test.ts
@@ -111,16 +111,19 @@ describe('GuardianClient.evaluateEVMTransaction — 422 handling', () => {
   });
 
   describe('when Guardian returns 422 and crossSdkBridgeEnabled is false (web SDK)', () => {
-    it('returns confirmationRequired: true instead of throwing', async () => {
+    it('throws INTERNAL_ERROR; TRANSACTION_REVERTED is only used for native clients', async () => {
       mockEvaluateTransaction.mockRejectedValue(
         makeAxiosError(422, { message: 'execution reverted' }),
       );
 
       const client = makeClient(false);
 
-      const result = await (client as any).evaluateEVMTransaction(evalParams);
-
-      expect(result).toEqual({ confirmationRequired: true });
+      await expect(
+        (client as any).evaluateEVMTransaction(evalParams),
+      ).rejects.toMatchObject({
+        code: RpcErrorCode.INTERNAL_ERROR,
+        message: expect.stringContaining('Transaction failed to validate with error:'),
+      });
     });
   });
 
diff --git a/packages/wallet/src/guardian/index.ts b/packages/wallet/src/guardian/index.ts
index 8bdf78aa60..9cf267689d 100644
--- a/packages/wallet/src/guardian/index.ts
+++ b/packages/wallet/src/guardian/index.ts
@@ -173,16 +173,14 @@ export default class GuardianClient {
         throw new WalletError('Service unavailable', WalletErrorType.SERVICE_UNAVAILABLE_ERROR);
       }
 
-      if (isAxiosError(error) && error.response?.status === 422) {
-        if (this.crossSdkBridgeEnabled) {
-          const revertReason = (error.response?.data as any)?.message ?? 'A transaction simulation reverted';
-          throw new JsonRpcError(
-            RpcErrorCode.TRANSACTION_REVERTED,
-            `Transaction will revert: ${revertReason}`,
-          );
-        }
-
-        return { confirmationRequired: true };
+      // For native clients, throw a TRANSACTION_REVERTED error if the guardian service
+      // responds with a 422.
+      if (isAxiosError(error) && error.response?.status === 422 && this.crossSdkBridgeEnabled) {
+        const revertReason = (error.response?.data as any)?.message ?? 'A transaction simulation reverted';
+        throw new JsonRpcError(
+          RpcErrorCode.TRANSACTION_REVERTED,
+          `Transaction will revert: ${revertReason}`,
+        );
       }
 
       const errorMessage = error instanceof Error ? error.message : String(error);