diff --git a/ape_safe/client/__init__.py b/ape_safe/client/__init__.py
index 1edf934..58088c0 100644
--- a/ape_safe/client/__init__.py
+++ b/ape_safe/client/__init__.py
@@ -1,3 +1,4 @@
+import json
 from datetime import datetime
 from functools import reduce
 from typing import Dict, Iterator, Optional, Union, cast
@@ -27,7 +28,14 @@
 from ape_safe.utils import get_safe_tx_hash, order_by_signer
 
 APE_SAFE_VERSION = get_package_version(__name__)
-ORIGIN = f"Ape-Safe/{APE_SAFE_VERSION} ({USER_AGENT})"
+APE_SAFE_USER_AGENT = f"Ape-Safe/{APE_SAFE_VERSION} {USER_AGENT}"
+# NOTE: Origin must be a string, but can be json that contains url & name fields
+ORIGIN = json.dumps(
+    dict(
+        url="https://apeworx.io", name="Ape Safe", ua=APE_SAFE_USER_AGENT
+    )
+)
+assert len(ORIGIN) <= 200  # NOTE: Must be less than 200 chars
 
 TRANSACTION_SERVICE_URL = {
     # NOTE: If URLs need to be updated, a list of available service URLs can be found at