diff --git a/strix/interface/cloud/runner.py b/strix/interface/cloud/runner.py
index c4f461e3..57b7ced3 100644
--- a/strix/interface/cloud/runner.py
+++ b/strix/interface/cloud/runner.py
@@ -371,8 +371,17 @@ def _topup(
             return http.EXIT_PAYMENT
 
     url = f"{http.app_url()}/api/v1/billing/topup"
-    auth_header = f"Authorization: Bearer {http.api_token(token)}"
-    command = [npx, "--yes", "mppx", url, "-J", json.dumps(body), "-H", auth_header]
+    auth_header = f"X-Strix-Authorization: Bearer {http.api_token(token)}"
+    command = [
+        npx,
+        "--yes",
+        "mppx",
+        url,
+        "-J",
+        json.dumps(body),
+        "-H",
+        auth_header,
+    ]
     payment_method = getattr(args, "payment_method", None) or os.environ.get(
         "MPPX_STRIPE_PAYMENT_METHOD"
     )
diff --git a/tests/test_cloud_cli.py b/tests/test_cloud_cli.py
index 820a30b5..2f03d75b 100644
--- a/tests/test_cloud_cli.py
+++ b/tests/test_cloud_cli.py
@@ -320,6 +320,8 @@ def test_topup_passes_payment_method_to_wallet(monkeypatch: pytest.MonkeyPatch)
         ["billing", "topup", "--credits", "5", "--yes", "--payment-method", "pm_card_visa"]
     )
     assert code == 0
+    assert "X-Strix-Authorization: Bearer tok" in commands[0]
+    assert "Authorization: Bearer tok" not in commands[0]
     assert "-M" in commands[0]
     assert "paymentMethod=pm_card_visa" in commands[0]