diff --git a/app/api/views/alias_options.py b/app/api/views/alias_options.py
index 1dc40d20..9f998258 100644
--- a/app/api/views/alias_options.py
+++ b/app/api/views/alias_options.py
@@ -90,7 +90,9 @@ def options_v5():
         suffixes: [
             {
                 suffix: "suffix",
-                signed_suffix: "signed_suffix"
+                signed_suffix: "signed_suffix",
+                is_custom: true,
+                is_premium: false
             }
         ]
         prefix_suggestion: str
@@ -141,7 +143,12 @@ def options_v5():
 
     # custom domain should be put first
     ret["suffixes"] = [
-        {"suffix": suffix.suffix, "signed_suffix": suffix.signed_suffix}
+        {
+            "suffix": suffix.suffix,
+            "signed_suffix": suffix.signed_suffix,
+            "is_custom": suffix.is_custom,
+            "is_premium": suffix.is_premium,
+        }
         for suffix in suffixes
     ]
 
diff --git a/docs/api.md b/docs/api.md
index 4588a54a..a5332a83 100644
--- a/docs/api.md
+++ b/docs/api.md
@@ -231,7 +231,8 @@ Input:
 Output: a json with the following field:
 
 - can_create: boolean. Whether user can create new alias
-- suffixes: list of dictionary with `suffix` and `signed-suffix`. List of alias `suffix` that user can use.
+- suffixes: list of alias suffix that user can use. 
+  Each item is a dictionary with `suffix`, `signed-suffix`, `is_custom`, `is_premium` as keys.
   The `signed-suffix` is necessary to avoid request tampering.
 - prefix_suggestion: string. Suggestion for the `alias prefix`. Usually this is the website name extracted
   from `hostname`. If no `hostname`, then the `prefix_suggestion` is empty.
@@ -248,15 +249,21 @@ For ex:
   "suffixes": [
     {
       "signed_suffix": ".cat@d1.test.X6_7OQ.0e9NbZHE_bQvuAapT6NdBml9m6Q",
-      "suffix": ".cat@d1.test"
+      "suffix": ".cat@d1.test",
+      "is_custom": true,
+      "is_premium": false
     },
     {
       "signed_suffix": ".chat@d2.test.X6_7OQ.TTgCrfqPj7UmlY723YsDTHhkess",
-      "suffix": ".chat@d2.test"
+      "suffix": ".chat@d2.test",
+      "is_custom": false,
+      "is_premium": false
     },
     {
       "signed_suffix": ".yeah@sl.local.X6_7OQ.i8XL4xsMsn7dxDEWU8eF-Zap0qo",
-      "suffix": ".yeah@sl.local"
+      "suffix": ".yeah@sl.local",
+      "is_custom": true,
+      "is_premium": false
     }
   ]
 }
diff --git a/tests/api/test_alias_options.py b/tests/api/test_alias_options.py
index f5e32525..6bd3c037 100644
--- a/tests/api/test_alias_options.py
+++ b/tests/api/test_alias_options.py
@@ -124,6 +124,8 @@ def test_different_scenarios_v5(flask_client):
             suffix_payload["signed_suffix"],
         )
         assert signed_suffix.startswith(suffix)
+        assert "is_custom" in suffix_payload
+        assert "is_premium" in suffix_payload
 
     # <<< with hostname >>>
     r = flask_client.get(
diff --git a/tests/test.env b/tests/test.env
index ae3dff84..5f6fc935 100644
--- a/tests/test.env
+++ b/tests/test.env
@@ -25,9 +25,9 @@ AWS_ACCESS_KEY_ID=to_fill
 AWS_SECRET_ACCESS_KEY=to_fill
 
 # Paddle
-PADDLE_VENDOR_ID = 1
-PADDLE_MONTHLY_PRODUCT_ID = 2
-PADDLE_YEARLY_PRODUCT_ID = 3
+PADDLE_VENDOR_ID=1
+PADDLE_MONTHLY_PRODUCT_ID=2
+PADDLE_YEARLY_PRODUCT_ID=3
 PADDLE_PUBLIC_KEY_PATH=local_data/paddle.key.pub
 
 # OpenId key