diff --git a/src/backend/clients/event/types.ts b/src/backend/clients/event/types.ts
index f9c65f7ace..27387de960 100644
--- a/src/backend/clients/event/types.ts
+++ b/src/backend/clients/event/types.ts
@@ -204,6 +204,13 @@ export type EventMap = {
     // ---- Subdomains ----
     'subdomain.delete': { subdomain: string };
     'subdomain.update': { subdomain: string };
+    'site.htmlServed': {
+        subdomain: string;
+        entry: unknown;
+        host: string;
+        requestPath: string;
+        mime: string;
+    };
 
     // ---- Thumbnails ----
     'thumbnail.read': {
diff --git a/src/backend/core/http/middleware/puterSite.ts b/src/backend/core/http/middleware/puterSite.ts
index 457090f8b1..6e60ae4274 100644
--- a/src/backend/core/http/middleware/puterSite.ts
+++ b/src/backend/core/http/middleware/puterSite.ts
@@ -21,9 +21,9 @@ import type { RequestHandler } from 'express';
 import { contentType as contentTypeFromMime } from 'mime-types';
 import { posix as pathPosix } from 'node:path';
 import type { puterClients } from '../../../clients';
+import { FS_COSTS } from '../../../controllers/fs/costs';
 import type { puterServices } from '../../../services';
 import type { puterStores } from '../../../stores';
-import { FS_COSTS } from '../../../controllers/fs/costs';
 import type { IConfig, LayerInstances } from '../../../types';
 import {
     buildAppCenterFallback,
@@ -495,6 +495,25 @@ export const createPuterSiteMiddleware = (
         const mime =
             contentTypeFromMime(entry.name) || 'application/octet-stream';
         res.setHeader('Content-Type', mime);
+
+        // Fire-and-forget signal for downstream extensions
+        if (mime === 'text/html' || mime === 'application/xhtml+xml') {
+            try {
+                layers.clients.event.emit(
+                    'site.htmlServed',
+                    {
+                        subdomain,
+                        entry,
+                        host,
+                        requestPath: req.path,
+                        mime,
+                    },
+                    {},
+                );
+            } catch (e) {
+                console.warn('[puter-site] site.htmlServed emit failed', e);
+            }
+        }
         if (download.contentLength !== null) {
             res.setHeader('Content-Length', String(download.contentLength));
         }