diff --git a/crontab b/crontab
index c7645a8..10b9fe7 100644
--- a/crontab
+++ b/crontab
@@ -1,2 +1,2 @@
 0 0 1 * *   user    /opt/app/monatliche-forderung-eintragen.py
-0 1 * * *   user    /opt/app/monatliche-forderung-ueberwachen.py
+* * * * *   user    /opt/app/monatliche-forderung-ueberwachen.py
diff --git a/monatliche-forderung-ueberwachen.py b/monatliche-forderung-ueberwachen.py
index 56f4eca..b7c844c 100755
--- a/monatliche-forderung-ueberwachen.py
+++ b/monatliche-forderung-ueberwachen.py
@@ -1,4 +1,33 @@
 #!/usr/bin/python3
 
-print("Monatliche Forderung ueberwachen")
+import requests
+import datetime
 
+class ResourceNotFoundException(Exception): pass
+
+def getJson(url):
+    resp = requests.get(url)
+    if resp.status_code != 200:
+        raise ResourceNotFoundException("URL: {}, Code: {}".format(url, resp.status_code))
+    return resp.json()
+
+
+BASE_URL = "http://172.16.10.29:5000/hv"
+URL_MIETERS_ACTIVE = "{base}/mieters/active"
+URL_SALDO_BY_MIETER = "{base}/mieter/{mieterId}/saldo/{year}"
+
+CURRENT_YEAR = datetime.datetime.now().year
+
+
+try:
+    activeMieters = getJson(URL_MIETERS_ACTIVE.format(base=BASE_URL))
+    mieters = [ { 'vorname': x['vorname'], 'nachname': x['nachname'], 'id': x['id'] } for x in activeMieters ]
+
+    for mieter in mieters:
+        saldoByMieter = getJson(URL_SALDO_BY_MIETER.format(base=BASE_URL, mieterId=mieter['id'], year=CURRENT_YEAR))
+
+        if abs(saldoByMieter['saldo']) > 0.5:
+            name = "{vorname} {nachname}".format(**mieter)
+            print("{name:30s}: {saldo:10.2f} €".format(saldo=saldoByMieter['saldo'], name=name))
+except Exception as e:
+    print("ERROR: {}".format(e))