diff --git a/app/scripts/lib/ppom/ppom-middleware.test.ts b/app/scripts/lib/ppom/ppom-middleware.test.ts
index 222222aa31f8..be7b5558d1ca 100644
--- a/app/scripts/lib/ppom/ppom-middleware.test.ts
+++ b/app/scripts/lib/ppom/ppom-middleware.test.ts
@@ -88,4 +88,23 @@ describe('PPOMMiddleware', () => {
     );
     expect(validateMock).toHaveBeenCalledTimes(1);
   });
+
+  it('should not call ppom.validateJsonRpc when request is not for confirmation method', async () => {
+    const validateMock = jest.fn();
+    const ppom = {
+      validateJsonRpc: validateMock,
+    };
+    const controller = {
+      usePPOM: async (callback: any) => {
+        callback(ppom);
+      },
+    };
+    const middlewareFunction = createPPOMMiddleware(controller as any);
+    await middlewareFunction(
+      { method: 'eth_someRequest' },
+      undefined,
+      () => undefined,
+    );
+    expect(validateMock).toHaveBeenCalledTimes(0);
+  });
 });
diff --git a/app/scripts/lib/ppom/ppom-middleware.ts b/app/scripts/lib/ppom/ppom-middleware.ts
index 1e69f6c4c3be..c58f74d60c4e 100644
--- a/app/scripts/lib/ppom/ppom-middleware.ts
+++ b/app/scripts/lib/ppom/ppom-middleware.ts
@@ -2,7 +2,7 @@ import { PPOM } from '@blockaid/ppom';
 
 import { PPOMController } from '@metamask/ppom-validator';
 
-const ConfirmationMethods = [
+const ConfirmationMethods = Object.freeze([
   'eth_sendRawTransaction',
   'eth_sendTransaction',
   'eth_sign',
@@ -11,7 +11,7 @@ const ConfirmationMethods = [
   'eth_signTypedData_v3',
   'eth_signTypedData_v4',
   'personal_sign',
-];
+]);
 
 /**
  * Middleware function that handles JSON RPC requests.