diff --git a/packages/notion-client/readme.md b/packages/notion-client/readme.md
index 0cab80e0..f3e38eec 100644
--- a/packages/notion-client/readme.md
+++ b/packages/notion-client/readme.md
@@ -36,6 +36,44 @@ const collectionData = await api.getCollectionData(
 )
 ```
 
+### Using Custom API Base URL
+
+**Important:** Due to recent changes in Notion's internal API you may need to specify your Notion site's subdomain when accessing public pages with collections/databases to avoid HTTP 530 errors.
+
+```ts
+import { NotionAPI } from 'notion-client'
+
+// For public Notion pages, use your site's subdomain
+const api = new NotionAPI({
+  apiBaseUrl: 'https://your-subdomain.notion.site/api/v3'
+})
+
+const page = await api.getPage('your-page-id')
+```
+
+**How to find your subdomain:**
+
+1. Open your Notion page in a web browser
+2. Look at the URL: `https://your-subdomain.notion.site/Page-Title-xxxxx`
+3. Copy the `your-subdomain` part
+4. Use it in the `apiBaseUrl` parameter
+
+**Example:**
+
+If your Notion page URL is `https://acme-corp.notion.site/Team-Wiki-abc123`, then:
+
+```ts
+const api = new NotionAPI({
+  apiBaseUrl: 'https://acme-corp.notion.site/api/v3'
+})
+```
+
+**Troubleshooting:**
+
+- ❌ `Error 530` when querying collections → Update `apiBaseUrl` with your subdomain
+- ❌ Using the old endpoint `https://www.notion.so/api/v3` → Switch to your site's URL
+- ✅ Private pages with `authToken` → The default endpoint usually works fine
+
 ### Fetch a database's content
 
 You can pass a database ID to the `getPage` method. The response is an object which contains several important properties:
diff --git a/packages/notion-client/src/notion-api.test.ts b/packages/notion-client/src/notion-api.test.ts
index d3b92df9..59b14733 100644
--- a/packages/notion-client/src/notion-api.test.ts
+++ b/packages/notion-client/src/notion-api.test.ts
@@ -1,4 +1,4 @@
-import { expect, test } from 'vitest'
+import { expect, test, vi } from 'vitest'
 
 import { NotionAPI } from './notion-api'
 
@@ -47,3 +47,75 @@ for (const pageId of pageIdFixturesFailure) {
     await expect(() => api.getPage(pageId)).rejects.toThrow()
   })
 }
+
+test('NotionAPI.getPage should log a helpful error on 530 errors', async () => {
+  const consoleErrorSpy = vi
+    .spyOn(console, 'error')
+    .mockImplementation(() => {})
+
+  const pageId = 'bdecdf15-0d0e-40cb-9f34-12be132335d4' // Use a valid UUID format
+  const collectionId = 'collection-id'
+  const viewId = 'view-id'
+
+  const api = new NotionAPI()
+
+  // Spy on the private fetch method to isolate the mock to this test
+  const fetchSpy = vi
+    .spyOn(api as any, 'fetch')
+    .mockImplementation(async (params: any) => {
+      const { endpoint } = params
+      if (endpoint === 'loadPageChunk') {
+        return {
+          recordMap: {
+            block: {
+              [pageId]: {
+                value: {
+                  id: pageId,
+                  type: 'collection_view_page',
+                  collection_id: collectionId,
+                  view_ids: [viewId]
+                }
+              }
+            },
+            collection: {
+              [collectionId]: {
+                value: { id: collectionId, name: [['Test Collection']] }
+              }
+            },
+            collection_view: {
+              [viewId]: {
+                value: { id: viewId, type: 'table' }
+              }
+            }
+          }
+        }
+      }
+
+      if (endpoint === 'queryCollection') {
+        const error: any = new Error('Response code 530')
+        error.status = 530
+        error.response = { status: 530 }
+        throw error
+      }
+
+      return {}
+    })
+
+  const page = await api.getPage(pageId, {
+    fetchCollections: true,
+    throwOnCollectionErrors: false
+  })
+
+  expect(page).toBeTruthy()
+  expect(consoleErrorSpy).toHaveBeenCalledWith(
+    expect.stringContaining('Notion API Error 530: Collection query failed')
+  )
+  expect(consoleErrorSpy).toHaveBeenCalledWith(
+    expect.stringContaining(
+      "Solution: Configure NotionAPI with your site's subdomain"
+    )
+  )
+
+  fetchSpy.mockRestore()
+  consoleErrorSpy.mockRestore()
+})
diff --git a/packages/notion-client/src/notion-api.ts b/packages/notion-client/src/notion-api.ts
index 9866a892..1b6cc03f 100644
--- a/packages/notion-client/src/notion-api.ts
+++ b/packages/notion-client/src/notion-api.ts
@@ -192,6 +192,29 @@ export class NotionAPI {
             // It's possible for public pages to link to private collections,
             // in which case Notion returns a 400 error. This may be that or it
             // may be something else.
+
+            // Special handling for 530 errors (API endpoint issues)
+            const is530Error =
+              err.response?.status === 530 ||
+              err.status === 530 ||
+              err.message?.includes('530')
+
+            if (is530Error) {
+              console.error(
+                '\n Notion API Error 530: Collection query failed\n' +
+                  '━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━\n' +
+                  ' This usually means the API endpoint needs to be updated.\n\n' +
+                  " Solution: Configure NotionAPI with your site's subdomain:\n\n" +
+                  '  const api = new NotionAPI({\n' +
+                  "    apiBaseUrl: 'https://YOUR-SUBDOMAIN.notion.site/api/v3'\n" +
+                  '  })\n\n' +
+                  ' Find your subdomain in your Notion page URL:\n' +
+                  '  https://YOUR-SUBDOMAIN.notion.site/...\n\n' +
+                  ' Learn more: https://github.com/NotionX/react-notion-x/tree/master/packages/notion-client#using-custom-api-base-url\n' +
+                  '━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━'
+              )
+            }
+
             console.warn(
               'NotionAPI collectionQuery error',
               { pageId, collectionId, collectionViewId },