diff --git a/agent-office/app/node_monitor.py b/agent-office/app/node_monitor.py
index bc53673..8bbd9a6 100644
--- a/agent-office/app/node_monitor.py
+++ b/agent-office/app/node_monitor.py
@@ -28,9 +28,13 @@ def _get_redis():
     return _redis
 
 
-def _beat_age(ts_str, now):
+def _beat_age(ts, now):
+    """ts는 ISO-8601 문자열 또는 epoch 숫자(매물알림 스펙 §4.4) 둘 다 허용."""
     try:
-        beat = dt.datetime.fromisoformat(ts_str.replace("Z", "+00:00"))
+        if isinstance(ts, (int, float)):
+            beat = dt.datetime.fromtimestamp(ts, tz=dt.timezone.utc)
+        else:
+            beat = dt.datetime.fromisoformat(ts.replace("Z", "+00:00"))
         return max(0, int((now - beat).total_seconds()))
     except Exception:
         return None
diff --git a/agent-office/tests/test_node_monitor.py b/agent-office/tests/test_node_monitor.py
index cf7115c..509fea7 100644
--- a/agent-office/tests/test_node_monitor.py
+++ b/agent-office/tests/test_node_monitor.py
@@ -224,3 +224,25 @@ async def test_naver_fetch_http_pull_link():
     st = await node_monitor.collect_status(redis=r)
     link = next(l for l in st["links"] if l["from"] == "naver-fetch")
     assert link["type"] == "http-pull" and link["to"] == "nas-realestate" and link["status"] == "healthy"
+
+
+# ── ts epoch 포맷 지원 (매물알림 스펙 §4.4: naver-fetch는 ts를 epoch 정수로 발신) ──
+
+@pytest.mark.asyncio
+async def test_epoch_ts_fresh_is_alive():
+    """ts가 epoch 정수(스펙 §4.4)여도 신선하면 alive=True."""
+    epoch_now = int(dt.datetime.now(dt.timezone.utc).timestamp())
+    r = FakeRedis(kv={"worker:naver-fetch:heartbeat": _hb("naver-fetch", "fetcher", "idle", ts=epoch_now)})
+    st = await node_monitor.collect_status(redis=r)
+    nf = next(w for w in st["workers"] if w["name"] == "naver-fetch")
+    assert nf["alive"] is True and nf["last_beat_age_s"] is not None
+
+
+@pytest.mark.asyncio
+async def test_epoch_ts_stale_is_dead():
+    """epoch ts가 90s 초과 과거면 staleness 판정으로 alive=False."""
+    epoch_old = int(dt.datetime.now(dt.timezone.utc).timestamp()) - 300
+    r = FakeRedis(kv={"worker:naver-fetch:heartbeat": _hb("naver-fetch", "fetcher", "idle", ts=epoch_old)})
+    st = await node_monitor.collect_status(redis=r)
+    nf = next(w for w in st["workers"] if w["name"] == "naver-fetch")
+    assert nf["alive"] is False and nf["last_beat_age_s"] >= 300