diff --git a/packages/app/src/composables/useAddress.ts b/packages/app/src/composables/useAddress.ts
index 60e92dc850..92859e5c0e 100644
--- a/packages/app/src/composables/useAddress.ts
+++ b/packages/app/src/composables/useAddress.ts
@@ -192,7 +192,9 @@ export default (context = useContext()) => {
       }
     } catch (error: unknown) {
       item.value = null;
-      isRequestFailed.value = true;
+      if (!(error instanceof FetchError) || ![403, 404].includes(error.response?.status ?? 0)) {
+        isRequestFailed.value = true;
+      }
     } finally {
       isRequestPending.value = false;
     }
diff --git a/packages/app/src/composables/useBlock.ts b/packages/app/src/composables/useBlock.ts
index fe69c6baaa..ebae731943 100644
--- a/packages/app/src/composables/useBlock.ts
+++ b/packages/app/src/composables/useBlock.ts
@@ -42,7 +42,7 @@ export default (context = useContext()) => {
       blockItem.value = await FetchInstance.api(context)(`/blocks/${id}`);
     } catch (error: unknown) {
       blockItem.value = null;
-      if (!(error instanceof FetchError) || error.response?.status !== 404) {
+      if (!(error instanceof FetchError) || ![403, 404].includes(error.response?.status ?? 0)) {
         isRequestFailed.value = true;
       }
     } finally {
diff --git a/packages/app/src/composables/useTransaction.ts b/packages/app/src/composables/useTransaction.ts
index aac83464ba..bca1fceb37 100644
--- a/packages/app/src/composables/useTransaction.ts
+++ b/packages/app/src/composables/useTransaction.ts
@@ -182,7 +182,7 @@ export default (context = useContext()) => {
         return;
       }
       transaction.value = null;
-      if (!(error instanceof FetchError)) {
+      if (!(error instanceof FetchError) || error.response?.status !== 403) {
         isRequestFailed.value = true;
       }
     } finally {
diff --git a/packages/app/src/locales/en.json b/packages/app/src/locales/en.json
index 483dd058a1..0e600b777e 100644
--- a/packages/app/src/locales/en.json
+++ b/packages/app/src/locales/en.json
@@ -805,6 +805,8 @@
     "notFound": {
         "title": "Oops, we can’t find anything",
         "description": "Sorry we can’t find anything on your search result, please try one more time via search bar below",
+        "prividiumTitle": "Nothing to show",
+        "prividiumDescription": "This page may not exist, or you might not have permissions to see it.",
         "contactSupportTitle": "If you think this is a problem with us, please",
         "contactSupport": "contact support"
     },
diff --git a/packages/app/src/views/BlockView.vue b/packages/app/src/views/BlockView.vue
index ce8fe4d117..03f226b2c8 100644
--- a/packages/app/src/views/BlockView.vue
+++ b/packages/app/src/views/BlockView.vue
@@ -53,7 +53,7 @@ import { isBlockNumber } from "@/utils/validators";
 
 const { t } = useI18n();
 
-const { setNotFoundView } = useNotFound();
+const { useNotFoundView, setNotFoundView } = useNotFound();
 const { getById, blockItem, isRequestPending: blockPending, isRequestFailed: blockFailed } = useBlock();
 
 const props = defineProps({
@@ -63,6 +63,8 @@ const props = defineProps({
   },
 });
 
+useNotFoundView(blockPending, blockFailed, blockItem);
+
 const breadcrumbItems = computed((): BreadcrumbItem[] => [
   {
     text: t("breadcrumbs.home"),
diff --git a/packages/app/src/views/NotFound.vue b/packages/app/src/views/NotFound.vue
index 3a922c8635..ccac53effc 100644
--- a/packages/app/src/views/NotFound.vue
+++ b/packages/app/src/views/NotFound.vue
@@ -1,9 +1,9 @@
 <template>
   <div class="not-found">
     <SearchIcon class="search-icon"></SearchIcon>
-    <h1 class="header">{{ t("notFound.title") }}</h1>
+    <h1 class="header">{{ isPrividium ? t("notFound.prividiumTitle") : t("notFound.title") }}</h1>
     <p class="description">
-      {{ t("notFound.description") }}
+      {{ isPrividium ? t("notFound.prividiumDescription") : t("notFound.description") }}
     </p>
     <SearchForm class="search-form"></SearchForm>
     <div class="contact-support">
@@ -14,13 +14,18 @@
 </template>
 
 <script lang="ts" setup>
+import { computed } from "vue";
 import { useI18n } from "vue-i18n";
 
 import { SearchIcon } from "@heroicons/vue/outline";
 
 import SearchForm from "@/components/SearchForm.vue";
 
+import useRuntimeConfig from "@/composables/useRuntimeConfig";
+
 const { t } = useI18n();
+const runtimeConfig = useRuntimeConfig();
+const isPrividium = computed(() => runtimeConfig.appEnvironment === "prividium");
 </script>
 
 <style lang="scss" scoped>
diff --git a/packages/app/tests/composables/useAddress.spec.ts b/packages/app/tests/composables/useAddress.spec.ts
index 3be06c0a6d..23ece2fb8f 100644
--- a/packages/app/tests/composables/useAddress.spec.ts
+++ b/packages/app/tests/composables/useAddress.spec.ts
@@ -2,7 +2,7 @@ import { computed } from "vue";
 
 import { afterEach, describe, expect, it, vi } from "vitest";
 
-import { $fetch } from "ohmyfetch";
+import { $fetch, FetchError } from "ohmyfetch";
 
 import useAddress from "@/composables/useAddress";
 
@@ -44,6 +44,9 @@ vi.mock("ohmyfetch", () => {
   (fetchSpy as unknown as { create: SpyInstance }).create = vi.fn(() => fetchSpy);
   return {
     $fetch: fetchSpy,
+    FetchError: function error() {
+      return;
+    },
   };
 });
 
@@ -118,7 +121,7 @@ describe("useAddresses", () => {
       await getByAddress("0xc31f9d4cbf557b6cf0ad2af66d44c358f7fa7a1a");
       expect(isRequestPending.value).toEqual(false);
     });
-    it("sets isRequestFailed to true when request failed", async () => {
+    it("sets isRequestFailed to true when request fails with a non-FetchError", async () => {
       // eslint-disable-next-line @typescript-eslint/no-explicit-any
       const mock = ($fetch as any).mockRejectedValueOnce(new Error("An error occurred"));
       const { isRequestFailed, getByAddress } = useAddress();
@@ -127,6 +130,32 @@ describe("useAddresses", () => {
       expect(isRequestFailed.value).toEqual(true);
       mock.mockRestore();
     });
+    it.each([403, 404])("routes FetchError status %i to the not-found view (isRequestFailed false)", async (status) => {
+      // eslint-disable-next-line @typescript-eslint/no-explicit-any
+      const error: any = new FetchError(String(status));
+      error.response = { status };
+      // eslint-disable-next-line @typescript-eslint/no-explicit-any
+      const mock = ($fetch as any).mockRejectedValueOnce(error);
+      const { isRequestFailed, item, getByAddress } = useAddress();
+      await getByAddress("0xc31f9d4cbf557b6cf0ad2af66d44c358f7fa7a1a");
+
+      expect(item.value).toEqual(null);
+      expect(isRequestFailed.value).toEqual(false);
+      mock.mockRestore();
+    });
+    it.each([400, 500])("shows the error page for FetchError status %i (isRequestFailed true)", async (status) => {
+      // eslint-disable-next-line @typescript-eslint/no-explicit-any
+      const error: any = new FetchError(String(status));
+      error.response = { status };
+      // eslint-disable-next-line @typescript-eslint/no-explicit-any
+      const mock = ($fetch as any).mockRejectedValueOnce(error);
+      const { isRequestFailed, item, getByAddress } = useAddress();
+      await getByAddress("0xc31f9d4cbf557b6cf0ad2af66d44c358f7fa7a1a");
+
+      expect(item.value).toEqual(null);
+      expect(isRequestFailed.value).toEqual(true);
+      mock.mockRestore();
+    });
   });
 
   describe("when called on contract", () => {
diff --git a/packages/app/tests/composables/useBlock.spec.ts b/packages/app/tests/composables/useBlock.spec.ts
index 81d8c991da..71379cdef2 100644
--- a/packages/app/tests/composables/useBlock.spec.ts
+++ b/packages/app/tests/composables/useBlock.spec.ts
@@ -56,12 +56,10 @@ describe("useBlock:", () => {
     expect(isRequestFailed.value).toEqual(true);
     mock.mockRestore();
   });
-  it("sets blockItem to null and failed to false when request fails with status code 404", async () => {
+  it.each([403, 404])("routes FetchError status %i to the not-found view (isRequestFailed false)", async (status) => {
     // eslint-disable-next-line @typescript-eslint/no-explicit-any
-    const error: any = new FetchError("404");
-    error.response = {
-      status: 404,
-    };
+    const error: any = new FetchError(String(status));
+    error.response = { status };
     // eslint-disable-next-line @typescript-eslint/no-explicit-any
     const mock = ($fetch as any).mockRejectedValue(error);
     const { isRequestFailed, blockItem, getById } = useBlock();
@@ -71,4 +69,17 @@ describe("useBlock:", () => {
     expect(isRequestFailed.value).toEqual(false);
     mock.mockRestore();
   });
+  it.each([400, 500])("shows the error page for FetchError status %i (isRequestFailed true)", async (status) => {
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+    const error: any = new FetchError(String(status));
+    error.response = { status };
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+    const mock = ($fetch as any).mockRejectedValue(error);
+    const { isRequestFailed, blockItem, getById } = useBlock();
+    await getById("1234");
+
+    expect(blockItem.value).toEqual(null);
+    expect(isRequestFailed.value).toEqual(true);
+    mock.mockRestore();
+  });
 });
diff --git a/packages/app/tests/composables/useTransaction.spec.ts b/packages/app/tests/composables/useTransaction.spec.ts
index 59bf924961..13cb77b225 100644
--- a/packages/app/tests/composables/useTransaction.spec.ts
+++ b/packages/app/tests/composables/useTransaction.spec.ts
@@ -441,6 +441,32 @@ describe("useTransaction:", () => {
       expect(isRequestFailed.value).toEqual(false);
       mock.mockRestore();
     });
+    it("routes status code 403 to the not-found view (isRequestFailed false)", async () => {
+      // eslint-disable-next-line @typescript-eslint/no-explicit-any
+      const error: any = new FetchError("403");
+      error.response = { status: 403 };
+      // eslint-disable-next-line @typescript-eslint/no-explicit-any
+      const mock = ($fetch as any).mockRejectedValue(error);
+      const { transaction, isRequestFailed, getByHash } = useTransaction();
+      await getByHash(hash);
+
+      expect(transaction.value).toEqual(null);
+      expect(isRequestFailed.value).toEqual(false);
+      mock.mockRestore();
+    });
+    it("shows the error page for status code 500 (isRequestFailed true)", async () => {
+      // eslint-disable-next-line @typescript-eslint/no-explicit-any
+      const error: any = new FetchError("500");
+      error.response = { status: 500 };
+      // eslint-disable-next-line @typescript-eslint/no-explicit-any
+      const mock = ($fetch as any).mockRejectedValue(error);
+      const { transaction, isRequestFailed, getByHash } = useTransaction();
+      await getByHash(hash);
+
+      expect(transaction.value).toEqual(null);
+      expect(isRequestFailed.value).toEqual(true);
+      mock.mockRestore();
+    });
     it("requests data successfully", async () => {
       const { transaction, isRequestFailed, getByHash } = useTransaction();
       await getByHash(hash);
diff --git a/packages/app/tests/views/BlockView.spec.ts b/packages/app/tests/views/BlockView.spec.ts
index dbf1a4d90e..5aece6b472 100644
--- a/packages/app/tests/views/BlockView.spec.ts
+++ b/packages/app/tests/views/BlockView.spec.ts
@@ -12,11 +12,12 @@ import $testId from "@/plugins/testId";
 import routes from "@/router/routes";
 import BlockView from "@/views/BlockView.vue";
 
+const notFoundRoute = { name: "not-found", meta: { title: "404 Not Found" } };
 const router = {
-  resolve: vi.fn(),
+  resolve: vi.fn(() => notFoundRoute),
   replace: vi.fn(),
   currentRoute: {
-    value: {},
+    value: { fullPath: "/block/1234" },
   },
   beforeEach: vi.fn(),
 };
diff --git a/packages/app/tests/views/NotFoundView.spec.ts b/packages/app/tests/views/NotFoundView.spec.ts
new file mode 100644
index 0000000000..6bbaef4cb2
--- /dev/null
+++ b/packages/app/tests/views/NotFoundView.spec.ts
@@ -0,0 +1,45 @@
+import { createI18n } from "vue-i18n";
+
+import { describe, expect, it, vi } from "vitest";
+
+import { mount } from "@vue/test-utils";
+
+import enUS from "@/locales/en.json";
+
+import $testId from "@/plugins/testId";
+import NotFound from "@/views/NotFound.vue";
+
+// SearchForm reaches into useContext / useSearch, so stub it out for this view test.
+vi.mock("@/components/SearchForm.vue", () => ({
+  default: { template: '<div data-testid="search-form-stub"></div>' },
+}));
+
+const runtimeConfigMock = { appEnvironment: "default" as "default" | "prividium" };
+vi.mock("@/composables/useRuntimeConfig", () => ({
+  default: () => runtimeConfigMock,
+}));
+
+function render() {
+  const i18n = createI18n({
+    locale: "en",
+    allowComposition: true,
+    messages: { en: enUS },
+  });
+  return mount(NotFound, { global: { plugins: [i18n, $testId] } });
+}
+
+describe("NotFound view", () => {
+  it("renders the default copy when appEnvironment is not prividium", () => {
+    runtimeConfigMock.appEnvironment = "default";
+    const wrapper = render();
+    expect(wrapper.find(".header").text()).toBe(enUS.notFound.title);
+    expect(wrapper.find(".description").text()).toBe(enUS.notFound.description);
+  });
+
+  it("renders the prividium copy when appEnvironment is prividium", () => {
+    runtimeConfigMock.appEnvironment = "prividium";
+    const wrapper = render();
+    expect(wrapper.find(".header").text()).toBe(enUS.notFound.prividiumTitle);
+    expect(wrapper.find(".description").text()).toBe(enUS.notFound.prividiumDescription);
+  });
+});