diff --git a/doc/OutAppPlanet.py b/doc/OutAppPlanet.py
new file mode 100644
index 00000000..23b2c9a8
--- /dev/null
+++ b/doc/OutAppPlanet.py
@@ -0,0 +1,24 @@
+# -*- coding: utf-8 -*-
+
+import _common
+
+class OutAppPlanet(object):
+
+    def __init__(self):
+        self.apis = [
+            {
+                'name': 'buy',
+                'desc': '购买星球',
+                'group': 'OutAppPlanet',
+                'url': 'webapp/index.php?c=OutAppPlanet&a=buy',
+                'params': [
+                    ['net_id', '', '链id'],
+                    ['num', 0, '数量'],
+                ],
+                'response': [
+                    _common.RspHead(),
+                    ['trans_id', '', '事务id'],
+                    ['!params', [''], '合约参数列表'],
+                ]
+            },
+        ]