diff --git a/docs/api.md b/docs/api.md
new file mode 100644
index 0000000..90e7056
--- /dev/null
+++ b/docs/api.md
@@ -0,0 +1,219 @@
+# REST API
+
+## Query
+
+### Execute a query
+
+```text
+POST /queries/execute
+```
+
+**Parameters:**
+
+* `connection_id` string
+* `data` dictionary
+
+**Example request (Kusto):**
+
+```json
+{
+    "connection_id": "c69e4539-5e13-4b73-84f3-9662fb4ee142",
+    "data": {
+        "cluster": "https://help.kusto.windows.net",
+        "database": "Samples",
+        "query": "StormEvents | take 1",
+        "parameters": {
+            "key": "value"
+        }
+    }
+}
+```
+
+**Example request (Splunk):**
+
+```json
+{
+    "connection_id": "c0aec099-ec07-45a4-86bd-b4e9fb26d708",
+    "data": {
+        "": "",
+    }
+}
+```
+
+**Response `202`:**
+
+```json
+{
+    "query_id": "bee731fd-20be-4d06-bfa5-d8d41ab8647a"
+}
+```
+
+### Retrieve query result
+
+```text
+GET /queries/:query_id/result
+```
+
+**Parameters:**
+
+* `limit` int
+* `page` int
+
+**Response:**
+
+```json
+{
+    "data": [
+        {
+            "key": "value"
+        },
+        {
+            "key": "value"
+        }
+    ]
+}
+```
+
+### List all labels for query result
+
+```text
+GET /queries/:query_id/labels
+```
+
+**Parameters:**
+
+* `since` timestamp
+* `limit` int
+* `page` int
+
+**Response:**
+
+```json
+[
+    {
+        "test": "TEST"
+    }
+]
+```
+
+### Auto-tag query result
+
+Retrieve tags for a query result using the given auto-tag group.
+
+```text
+POST /queries/:query_id/autotag/:group_id
+```
+
+**Parameters:**
+
+No parameters.
+
+**Response:**
+
+Alternate1:
+
+```json
+[
+    [],
+    ["tag1", "tag2"],
+    []
+]
+```
+
+Alternate2:
+
+```json
+{
+    "1": ["tag1", "tag2"]
+}
+```
+
+Alternate3:
+
+```json
+[
+    {
+        "row": 1,
+        "tags": ["tag1", "tag2"]
+    }
+]
+```
+
+## Labels
+
+### List all recent labels
+
+```text
+GET /labels
+```
+
+**Parameters:**
+
+* `since` timestamp
+* `limit` int
+* `page` int
+
+**Response:**
+
+```json
+[
+    {
+        "test": "TEST"
+    }
+]
+```
+
+### Retrieve label
+
+```text
+GET /labels/:event_id
+```
+
+**Parameters:**
+
+No parameters.
+
+**Response:**
+
+```json
+{
+    "test": "TEST"
+}
+```
+
+### Create label
+
+```text
+POST /labels
+```
+
+**Parameters:**
+
+* `event_id` string
+* `label` string
+
+**Response:**
+
+```json
+{
+    "test": "TEST"
+}
+```
+
+### Delete label
+
+```text
+DELETE /labels/:event_id
+```
+
+**Parameters:**
+
+No parameters.
+
+**Response:**
+
+```json
+{
+    "test": "TEST"
+}
+```