diff --git a/views_api.py b/views_api.py
index b1aeed4..8c22f96 100644
--- a/views_api.py
+++ b/views_api.py
@@ -94,6 +94,12 @@ from .auth import (
 
 libra_api_router = APIRouter()
 
+# Synthetic Beancount flags marking auto-generated entries (summarization,
+# padding, transfers, conversions, unrealized gains, returns, merging) that
+# should not appear in user-facing transaction lists. Mirrors Fava's
+# _EXCL_FLAGS in fava/core/file.py.
+_SYNTHETIC_FLAGS = frozenset({"S", "T", "C", "P", "U", "R", "M"})
+
 
 # ===== HELPER FUNCTIONS =====
 
@@ -391,6 +397,8 @@ async def api_get_journal_entries(
     for e in all_entries:
         if e.get("t") != "Transaction":
             continue
+        if e.get("flag") in _SYNTHETIC_FLAGS:
+            continue
 
         # Extract user ID from metadata or account names
         user_id = None
@@ -475,6 +483,8 @@ async def api_get_user_entries(
     for e in all_entries:
         if e.get("t") != "Transaction":
             continue
+        if e.get("flag") in _SYNTHETIC_FLAGS:
+            continue
 
         # Skip voided transactions
         if "voided" in e.get("tags", []):