diff --git a/pychunkedgraph/app/segmentation/common.py b/pychunkedgraph/app/segmentation/common.py
index 89696c61f..77144133b 100644
--- a/pychunkedgraph/app/segmentation/common.py
+++ b/pychunkedgraph/app/segmentation/common.py
@@ -853,8 +853,11 @@ def merge_log(table_id, root_id):
 
 def _parse_timestamp(arg_name, default_timestamp=0, return_datetime=False):
     """Convert seconds since epoch to UTC datetime."""
+    timestamp = request.args.get(arg_name, default_timestamp)
+    if timestamp is None:
+        raise (cg_exceptions.BadRequest(f"Timestamp parameter {arg_name} is mandatory"))
     try:
-        timestamp = float(request.args.get(arg_name, default_timestamp))
+        timestamp = float(timestamp)
         if return_datetime:
             return datetime.fromtimestamp(timestamp, UTC)
         else:
@@ -1191,3 +1194,18 @@ def parse_attr(attr, val) -> str:
                 details[_k] = _v
         result[int(k)] = details
     return result
+
+
+### DELTA ROOTS ------------------------------------------------------------
+
+
+def delta_roots(table_id):
+    current_app.table_id = table_id
+
+    timestamp_past = _parse_timestamp("timestamp_past", None, return_datetime=True)
+    timestamp_future = _parse_timestamp(
+        "timestamp_future", time.time(), return_datetime=True
+    )
+    cg = app_utils.get_cg(table_id)
+    old_roots, new_roots = cg.get_proofread_root_ids(timestamp_past, timestamp_future)
+    return {"old_roots": old_roots, "new_roots": new_roots}
diff --git a/pychunkedgraph/app/segmentation/v1/routes.py b/pychunkedgraph/app/segmentation/v1/routes.py
index 6e48ba57f..83af1118f 100644
--- a/pychunkedgraph/app/segmentation/v1/routes.py
+++ b/pychunkedgraph/app/segmentation/v1/routes.py
@@ -501,3 +501,14 @@ def operation_details(table_id):
     int64_as_str = request.args.get("int64_as_str", default=False, type=toboolean)
     resp = common.operation_details(table_id)
     return jsonify_with_kwargs(resp, int64_as_str=int64_as_str)
+
+
+### GET PROOFREAD IDS --------------------------------------------------------
+
+
+@bp.route("/table/<table_id>/delta_roots", methods=["GET"])
+@auth_requires_permission("view")
+def delta_roots(table_id):
+    int64_as_str = request.args.get("int64_as_str", default=False, type=toboolean)
+    resp = common.delta_roots(table_id)
+    return jsonify_with_kwargs(resp, int64_as_str=int64_as_str)