diff --git a/sentry_sdk/consts.py b/sentry_sdk/consts.py
index 6c9ae117dc..8e4bf4981f 100644
--- a/sentry_sdk/consts.py
+++ b/sentry_sdk/consts.py
@@ -24,6 +24,7 @@
     "ignore_errors": [],
     "request_bodies": "medium",
     "before_send": None,
+    "before_breadcrumb": None,
     "debug": False,
 }
 
diff --git a/sentry_sdk/hub.py b/sentry_sdk/hub.py
index ca991066ac..c66bb6be84 100644
--- a/sentry_sdk/hub.py
+++ b/sentry_sdk/hub.py
@@ -1,5 +1,6 @@
 import sys
 import copy
+from datetime import datetime
 from contextlib import contextmanager
 
 from ._compat import with_metaclass
@@ -158,6 +159,16 @@ def add_breadcrumb(self, *args, **kwargs):
             crumb = args[0]()
         else:
             crumb = dict(*args, **kwargs)
+        if crumb is None:
+            return
+
+        if crumb.get("timestamp") is None:
+            crumb["timestamp"] = datetime.utcnow()
+        if crumb.get("type") is None:
+            crumb["type"] = "default"
+
+        if client.options["before_breadcrumb"] is not None:
+            crumb = client.options["before_breadcrumb"](crumb)
 
         if crumb is not None:
             scope._breadcrumbs.append(crumb)
diff --git a/tests/test_basics.py b/tests/test_basics.py
index 5bc8881dc6..5fa8bd03b2 100644
--- a/tests/test_basics.py
+++ b/tests/test_basics.py
@@ -1,4 +1,10 @@
-from sentry_sdk import configure_scope, capture_exception, last_event_id, Hub
+from sentry_sdk import (
+    configure_scope,
+    capture_exception,
+    add_breadcrumb,
+    last_event_id,
+    Hub,
+)
 
 
 def test_processors(sentry_init, capture_events):
@@ -38,3 +44,43 @@ def test_event_id(sentry_init, capture_events):
     assert event["event_id"] == event_id
     assert last_event_id() == event_id
     assert Hub.current.last_event_id() == event_id
+
+
+def test_option_callback(sentry_init, capture_events):
+    drop_events = False
+    drop_breadcrumbs = False
+
+    def before_send(event):
+        if not drop_events:
+            event["extra"] = {"foo": "bar"}
+            return event
+
+    def before_breadcrumb(crumb):
+        if not drop_breadcrumbs:
+            crumb["data"] = {"foo": "bar"}
+            return crumb
+
+    sentry_init(before_send=before_send, before_breadcrumb=before_breadcrumb)
+    events = capture_events()
+
+    def do_this():
+        add_breadcrumb(message="Hello")
+        try:
+            raise ValueError("aha!")
+        except Exception:
+            capture_exception()
+
+    do_this()
+    drop_breadcrumbs = True
+    do_this()
+    drop_events = True
+    do_this()
+
+    normal, no_crumbs = events
+
+    assert normal["exception"]["values"][0]["type"] == "ValueError"
+    crumb, = normal["breadcrumbs"]
+    assert "timestamp" in crumb
+    assert crumb["message"] == "Hello"
+    assert crumb["data"] == {"foo": "bar"}
+    assert crumb["type"] == "default"