diff --git a/src/ytstudio/api.py b/src/ytstudio/api.py
index 48f11f6..178be14 100644
--- a/src/ytstudio/api.py
+++ b/src/ytstudio/api.py
@@ -63,6 +63,10 @@ def api(request):
     "https://www.googleapis.com/auth/youtube.readonly",
     "https://www.googleapis.com/auth/youtube.force-ssl",
     "https://www.googleapis.com/auth/yt-analytics.readonly",
+    # Required to read revenue/earnings metrics (estimatedRevenue, cpm, ...).
+    # Without it the Analytics API returns 401 "Insufficient permission" for
+    # the monetary metrics that the registry already exposes.
+    "https://www.googleapis.com/auth/yt-analytics-monetary.readonly",
 ]
 
 HEADLESS_REDIRECT_URI = "http://127.0.0.1:9876/"
diff --git a/tests/test_api.py b/tests/test_api.py
index 076a444..a063243 100644
--- a/tests/test_api.py
+++ b/tests/test_api.py
@@ -20,6 +20,13 @@ def make_http_error(status: int, reason: str = ""):
     return error
 
 
+class TestScopes:
+    def test_includes_monetary_analytics_scope(self):
+        # Revenue/earnings metrics (estimatedRevenue, cpm, ...) require this
+        # scope; without it the Analytics API returns 401 for monetary reports.
+        assert "https://www.googleapis.com/auth/yt-analytics-monetary.readonly" in api_module.SCOPES
+
+
 class TestHandleApiError:
     def test_quota_exceeded_exits(self):
         error = make_http_error(403, "quotaExceeded")