diff --git a/etebase_fastapi/app.py b/etebase_fastapi/app.py
index 0ee7aae..acfb42f 100644
--- a/etebase_fastapi/app.py
+++ b/etebase_fastapi/app.py
@@ -9,10 +9,14 @@ from fastapi import FastAPI, Request
 
 from .execptions import CustomHttpException
 from .authentication import authentication_router
+from .collection import collection_router
 from .msgpack import MsgpackResponse
 
 app = FastAPI()
-app.include_router(authentication_router, prefix="/api/v1/authentication")
+VERSION = "v1"
+BASE_PATH = f"/api/{VERSION}"
+app.include_router(authentication_router, prefix=f"{BASE_PATH}/authentication")
+app.include_router(collection_router, prefix=f"{BASE_PATH}/collection")
 app.add_middleware(
     CORSMiddleware, allow_origin_regex="https?://.*", allow_credentials=True, allow_methods=["*"], allow_headers=["*"]
 )
@@ -26,4 +30,4 @@ async def custom_exception_handler(request: Request, exc: CustomHttpException):
 if __name__ == "__main__":
     import uvicorn
 
-    uvicorn.run(app, host="0.0.0.0", port=8080)
+    uvicorn.run(app, host="0.0.0.0", port=8000)
diff --git a/etebase_fastapi/authentication.py b/etebase_fastapi/authentication.py
index b1a3272..697f3f4 100644
--- a/etebase_fastapi/authentication.py
+++ b/etebase_fastapi/authentication.py
@@ -50,6 +50,9 @@ class LoginResponse(BaseModel):
 
 
 class Authentication(BaseModel):
+    class Config:
+        keep_untouched = (cached_property,)
+
     response: bytes
     signature: bytes
 
diff --git a/etebase_fastapi/collection.py b/etebase_fastapi/collection.py
new file mode 100644
index 0000000..ec0125d
--- /dev/null
+++ b/etebase_fastapi/collection.py
@@ -0,0 +1,72 @@
+import typing as t
+
+from django.contrib.auth import get_user_model
+from django.db.models import Q
+from django.db.models import QuerySet
+from fastapi import APIRouter, Depends
+from pydantic import BaseModel
+from asgiref.sync import sync_to_async
+
+from django_etebase.models import Collection, Stoken, AccessLevels, CollectionMember
+from .authentication import get_authenticated_user
+from .msgpack import MsgpackRoute, MsgpackResponse
+
+User = get_user_model()
+collection_router = APIRouter(route_class=MsgpackRoute)
+default_queryset = Collection.objects.all()
+
+
+class ListMulti(BaseModel):
+    collectionTypes: t.List[bytes]
+
+
+class CollectionItemOut(BaseModel):
+    uid: str
+
+
+class CollectionOut(BaseModel):
+    collectionKey: bytes
+    collectionType: bytes
+    accessLevel: AccessLevels
+    stoken: str
+    item: CollectionItemOut
+
+    @classmethod
+    def from_orm_user(cls: t.Type["CollectionOut"], obj: Collection, user: User) -> "CollectionOut":
+        member: CollectionMember = obj.members.get(user=user)
+        collection_type = member.collectionType
+        return cls(
+            collectionType=collection_type and collection_type.uid,
+            collectionKey=member.encryptionKey,
+            accessLevel=member.accessLevel,
+            stoken=obj.stoken,
+            item=CollectionItemOut(uid=obj.main_item.uid),
+        )
+
+
+class ListResponse(BaseModel):
+    data: t.List[CollectionOut]
+    stoken: t.Optional[str]
+    done: bool
+
+
+@sync_to_async
+def list_common(queryset: QuerySet, stoken: t.Optional[str], user: User) -> MsgpackResponse:
+    data: t.List[CollectionOut] = [CollectionOut.from_orm_user(item, user) for item in queryset]
+    ret = ListResponse(data=data, stoken=stoken, done=True)
+    return MsgpackResponse(content=ret)
+
+
+def get_collection_queryset(user: User, queryset: QuerySet) -> QuerySet:
+    return queryset.filter(members__user=user)
+
+
+@collection_router.post("/list_multi/")
+async def list_multi(limit: int, data: ListMulti, user: User = Depends(get_authenticated_user)):
+    queryset = get_collection_queryset(user, default_queryset)
+    # FIXME: Remove the isnull part once we attach collection types to all objects ("collection-type-migration")
+    queryset = queryset.filter(
+        Q(members__collectionType__uid__in=data.collectionTypes) | Q(members__collectionType__isnull=True)
+    )
+    response = await list_common(queryset, None, user)
+    return response
diff --git a/etebase_fastapi/collections.py b/etebase_fastapi/collections.py
deleted file mode 100644
index e69de29..0000000