diff --git a/api-master-list.md b/api-master-list.md
index 39ec405..41a20f0 100644
--- a/api-master-list.md
+++ b/api-master-list.md
@@ -113,3 +113,10 @@
 - Internal: ~40 endpoints
 - External free: 15
 - Paid external: ~32
+
+## Health monitoring
+- Script: `/root/.hermes/scripts/api-health-check.py` (probes all 41 internal endpoints)
+- Watchdog: cron job `35f99c362658` runs every 30 min, alerts Telegram only when something is down
+- JSON state: `/var/log/api-health/api-health.json`
+- Coverage: 41 endpoints across Core, app1, app2, app3 (verified 41/41 up on 2026-07-31)
+- Note: localhost-bound services on remote hosts are probed via SSH (`ssh root@host curl 127.0.0.1:PORT`); Grafana is on :3002 not :3000; Wazuh dashboard is HTTPS-only.