diff --git a/django_etesync/serializers.py b/django_etesync/serializers.py
index 185eb6e..1cc4a7e 100644
--- a/django_etesync/serializers.py
+++ b/django_etesync/serializers.py
@@ -339,6 +339,14 @@ class UserQuerySerializer(serializers.ModelSerializer):
         fields = (User.USERNAME_FIELD, User.EMAIL_FIELD)
 
 
+class UserInfoPubkeySerializer(serializers.ModelSerializer):
+    pubkey = BinaryBase64Field()
+
+    class Meta:
+        model = models.UserInfo
+        fields = ('pubkey', )
+
+
 class AuthenticationSignupSerializer(serializers.Serializer):
     user = UserQuerySerializer(many=False)
     salt = BinaryBase64Field()
diff --git a/django_etesync/views.py b/django_etesync/views.py
index a1d6d09..7130eae 100644
--- a/django_etesync/views.py
+++ b/django_etesync/views.py
@@ -34,7 +34,7 @@ import nacl.secret
 import nacl.hash
 
 from . import app_settings, permissions
-from .models import Collection, CollectionItem, CollectionItemRevision, CollectionMember, CollectionInvitation
+from .models import Collection, CollectionItem, CollectionItemRevision, CollectionMember, CollectionInvitation, UserInfo
 from .serializers import (
         b64encode,
         AuthenticationSignupSerializer,
@@ -50,6 +50,7 @@ from .serializers import (
         CollectionMemberSerializer,
         CollectionInvitationSerializer,
         InvitationAcceptSerializer,
+        UserInfoPubkeySerializer,
         UserSerializer,
     )
 
@@ -456,6 +457,14 @@ class CollectionInvitationViewSet(BaseViewSet):
 
         return queryset.filter(fromMember__collection=collection)
 
+    @action_decorator(detail=False, allowed_methods=['GET'], methods=['GET'])
+    def fetch_user_profile(self, request, collection_uid=None):
+        username = request.GET.get('username')
+        kwargs = {'owner__' + User.USERNAME_FIELD: username}
+        user_info = get_object_or_404(UserInfo.objects.all(), **kwargs)
+        serializer = UserInfoPubkeySerializer(user_info)
+        return Response(serializer.data)
+
 
 class InvitationIncomingViewSet(BaseViewSet):
     allowed_methods = ['GET', 'DELETE']