diff --git a/app.py b/app.py
index ab74137..66db1cf 100644
--- a/app.py
+++ b/app.py
@@ -11,6 +11,7 @@ from shared.services.registry import services
 from bp import (
     register_identity_bp,
     register_social_bp,
+    register_fragments,
 )
 
 
@@ -63,6 +64,7 @@ def create_app() -> "Quart":
     # by the shared AP blueprint registered in create_base_app().
     app.register_blueprint(register_identity_bp())
     app.register_blueprint(register_social_bp())
+    app.register_blueprint(register_fragments())
 
     # --- home page ---
     @app.get("/")
diff --git a/bp/__init__.py b/bp/__init__.py
index 0965667..1be06bb 100644
--- a/bp/__init__.py
+++ b/bp/__init__.py
@@ -1,2 +1,3 @@
 from .identity.routes import register as register_identity_bp
 from .social.routes import register as register_social_bp
+from .fragments import register_fragments
diff --git a/bp/fragments/__init__.py b/bp/fragments/__init__.py
new file mode 100644
index 0000000..a4af44b
--- /dev/null
+++ b/bp/fragments/__init__.py
@@ -0,0 +1 @@
+from .routes import register as register_fragments
diff --git a/bp/fragments/routes.py b/bp/fragments/routes.py
new file mode 100644
index 0000000..d4e20d1
--- /dev/null
+++ b/bp/fragments/routes.py
@@ -0,0 +1,34 @@
+"""Federation app fragment endpoints.
+
+Exposes HTML fragments at ``/internal/fragments/<type>`` for consumption
+by other coop apps via the fragment client.
+"""
+
+from __future__ import annotations
+
+from quart import Blueprint, Response, request
+
+from shared.infrastructure.fragments import FRAGMENT_HEADER
+
+
+def register():
+    bp = Blueprint("fragments", __name__, url_prefix="/internal/fragments")
+
+    _handlers: dict[str, object] = {}
+
+    @bp.before_request
+    async def _require_fragment_header():
+        if not request.headers.get(FRAGMENT_HEADER):
+            return Response("", status=403)
+
+    @bp.get("/<fragment_type>")
+    async def get_fragment(fragment_type: str):
+        handler = _handlers.get(fragment_type)
+        if handler is None:
+            return Response("", status=200, content_type="text/html")
+        html = await handler()
+        return Response(html, status=200, content_type="text/html")
+
+    bp._fragment_handlers = _handlers
+
+    return bp
diff --git a/shared b/shared
index e7d1809..b882770 160000
--- a/shared
+++ b/shared
@@ -1 +1 @@
-Subproject commit e7d180912b0dfc1ed40d70b002cfebde9250026a
+Subproject commit b882770828be7c62bbd047146e03b83511a2397d