diff --git a/bundles/gitea/metadata.py b/bundles/gitea/metadata.py
index b645fd2..939609f 100644
--- a/bundles/gitea/metadata.py
+++ b/bundles/gitea/metadata.py
@@ -75,7 +75,7 @@ def icinga_check_for_new_release(metadata):
                 'services': {
                     'GITEA UPDATE': {
                         'command_on_monitored_host': '/usr/local/share/icinga/plugins/check_github_for_new_release go-gitea/gitea v{}'.format(metadata.get('gitea/version')),
-                        'retry_interval': '60m',
+                        'check_interval': '60m',
                     },
                 },
             },
diff --git a/bundles/icinga2/files/check_sipgate_account_balance b/bundles/icinga2/files/check_sipgate_account_balance
new file mode 100644
index 0000000..8e8ce2d
--- /dev/null
+++ b/bundles/icinga2/files/check_sipgate_account_balance
@@ -0,0 +1,47 @@
+#!/usr/bin/env python3
+
+from requests import get
+from sys import exit
+
+SIPGATE_USER = '${node.metadata['icinga2']['sipgate_user']}'
+SIPGATE_PASS = '${node.metadata['icinga2']['sipgate_pass']}'
+
+try:
+    r = get(
+        'https://api.sipgate.com/v2/balance',
+        auth=(SIPGATE_USER, SIPGATE_PASS),
+        headers={'Accept': 'application/json'},
+    )
+
+    if r.status_code == 401:
+        # Status code 401 means our login data is wrong. Since we're
+        # using the same login data in icinga_notification_wrapper, we
+        # won't be able to send SMS either. This should *not* result in
+        # this check going UNKNOWN.
+        print('CRITICAL: Getting the account balance failed with status code 401!')
+        exit(2)
+    else:
+        r.raise_for_status()
+except Exception as e:
+    print(repr(e))
+    exit(3)
+
+# No, we can't combine those two try..except blocks, because a connection
+# error means the check is UNKNOWN, but a parsing error is CRITICAL.
+try:
+    json = r.json()
+    money = json['amount']/10000
+
+    if money < 2:
+        print('CRITICAL: Only {} {} left in account!'.format(money, json['currency']))
+        exit(2)
+    elif money < 3:
+        print('WARNING: Only {} {} left in account!'.format(money, json['currency']))
+        exit(1)
+    else:
+        print('Account holds {} {}.'.format(money, json['currency']))
+        exit(0)
+except Exception as e:
+    # API changed, returned malformed JSON or whatever. This is an error.
+    print(repr(e))
+    exit(2)
diff --git a/bundles/icinga2/files/icinga2/check_commands.conf b/bundles/icinga2/files/icinga2/check_commands.conf
index 9f59c72..0d79cc5 100644
--- a/bundles/icinga2/files/icinga2/check_commands.conf
+++ b/bundles/icinga2/files/icinga2/check_commands.conf
@@ -79,6 +79,13 @@ object CheckCommand "check_imap" {
     }
 }
 
+object CheckCommand "check_sipgate_account_balance" {
+    import "plugin-check-command"
+    import "ipv4-or-ipv6"
+
+    command = [ "/usr/local/share/icinga/plugins/check_sipgate_account_balance" ]
+}
+
 object CheckCommand "check_smtp" {
     import "plugin-check-command"
     import "ipv4-or-ipv6"
diff --git a/bundles/icinga2/items.py b/bundles/icinga2/items.py
index b0e5874..0836885 100644
--- a/bundles/icinga2/items.py
+++ b/bundles/icinga2/items.py
@@ -71,6 +71,10 @@ files = {
     '/usr/local/share/icinga/plugins/check_by_sshmon': {
         'mode': '0755',
     },
+    '/usr/local/share/icinga/plugins/check_sipgate_account_balance': {
+        'mode': '0755',
+        'content_type': 'mako',
+    },
     '/etc/sshmon.priv': {
         'content': repo.vault.decrypt_file(join('sshmon', 'sshmon.key.vault')),
         'owner': 'nagios',
diff --git a/bundles/icinga2/metadata.py b/bundles/icinga2/metadata.py
index 2378a9c..91ce91d 100644
--- a/bundles/icinga2/metadata.py
+++ b/bundles/icinga2/metadata.py
@@ -30,6 +30,16 @@ defaults = {
             'root': repo.vault.password_for(f'{node.name} icinga2 api root'),
         },
     },
+    'icinga2_api': {
+        'icinga2': {
+            'services': {
+                'SIPGATE ACCOUNT BALANCE': {
+                    'check_command': 'check_sipgate_account_balance',
+                    'check_interval': '30m',
+                },
+            },
+        },
+    },
     'icingaweb2': {
         'setup-token': repo.vault.password_for(f'{node.name} icingaweb2 setup-token'),
     },
diff --git a/bundles/mautrix-telegram/metadata.py b/bundles/mautrix-telegram/metadata.py
index f4782dc..5873d80 100644
--- a/bundles/mautrix-telegram/metadata.py
+++ b/bundles/mautrix-telegram/metadata.py
@@ -51,7 +51,7 @@ def icinga_check_for_new_release(metadata):
                 'services': {
                     'MAUTRIX-TELEGRAM UPDATE': {
                         'command_on_monitored_host': '/usr/local/share/icinga/plugins/check_github_for_new_release tulir/mautrix-telegram {}'.format(metadata.get('mautrix-telegram/version')),
-                        'retry_interval': '60m',
+                        'check_interval': '60m',
                     },
                 },
             },