diff --git a/intro/changelog.md b/intro/changelog.md
index 6f52a7f..a4a0a63 100644
--- a/intro/changelog.md
+++ b/intro/changelog.md
@@ -25,6 +25,10 @@ Listed below are all the changes to the SeaTable API. Each date corresponds to a
 > **Base Operations**
 >
 > - [Create Row Comment](/reference/createrowcomment) <span class="APIMethod APIMethod_fixedWidth APIMethod_post">post</span>
+>
+> **Account Operations - User**
+>
+> - [Get Base Asset Size](/reference/getbaseassetsize) <span class="APIMethod APIMethod_fixedWidth APIMethod_get">get</span>
 
 > 👍 Other changes
 >
diff --git a/tests/test_assets.py b/tests/test_assets.py
new file mode 100644
index 0000000..0612ef3
--- /dev/null
+++ b/tests/test_assets.py
@@ -0,0 +1,19 @@
+"""Tests for the base asset endpoints."""
+
+from conftest import Base, Secret, user_account_operations
+from schemathesis import Case
+
+
+def test_getBaseAssetSize(base: Base, account_token: Secret):
+    """A base without attachments reports a size of 0 and can be exported with its assets."""
+    case: Case = user_account_operations.find_operation_by_id('getBaseAssetSize') \
+        .Case(path_parameters={'base_uuid': base.uuid})
+    response = case.call(headers={'Authorization': f'Bearer {account_token.value}'})
+
+    assert response.status_code == 200
+    assert response.json() == {
+        'asset_size': 0,
+        'max_size_of_export': 100,
+        'unit': 'mb',
+        'can_export_asset': True,
+    }
diff --git a/user_account_operations.yaml b/user_account_operations.yaml
index 0cbce0f..ee4e22f 100644
--- a/user_account_operations.yaml
+++ b/user_account_operations.yaml
@@ -4142,6 +4142,50 @@ paths:
                 type: object
               example:
                 success: true
+  /api/v2.1/dtable-asset/{base_uuid}/asset-size/:
+    get:
+      tags:
+        - Attachment
+      summary: Get Base Asset Size
+      operationId: getBaseAssetSize
+      description: >-
+        Get the total size of all assets (attachments, images and files) stored
+        in a base and check whether the base can be exported together with its
+        assets.
+
+        All sizes are given in megabytes, rounded down. `max_size_of_export` is
+        the server-wide limit configured by the system administrator (default:
+        100). If `can_export_asset` is `false`, the assets of this base exceed
+        that limit and the base can only be exported without its assets.
+      security:
+        - AccountTokenAuth: []
+      parameters:
+        - $ref: "#/components/parameters/base_uuid"
+      responses:
+        "200":
+          description: OK
+          content:
+            application/json:
+              schema:
+                type: object
+                properties:
+                  asset_size:
+                    type: integer
+                    description: Total size of all assets of the base.
+                  max_size_of_export:
+                    type: integer
+                    description: Maximum asset size that can be included in an export.
+                  unit:
+                    type: string
+                    description: Unit of the returned sizes.
+                  can_export_asset:
+                    type: boolean
+                    description: Whether the assets of this base can be included in an export.
+              example:
+                asset_size: 0
+                max_size_of_export: 100
+                unit: mb
+                can_export_asset: true
   /api/v2.1/dtable-recent-asset/{base_uuid}/:
     get:
       tags: