diff --git a/service.py b/service.py
index 2b67748..1627d03 100755
--- a/service.py
+++ b/service.py
@@ -1,35 +1,41 @@
 #!/usr/bin/env python3
 
-import json
 import requests
 import tomlkit
 import urllib3
 urllib3.disable_warnings()
 
 class StatusPage:
-    def do_api_calls(self):
-        #services
-        request_url = "{}/v1/objects/services".format(self.config['icinga2_api']['baseurl'])
+    def get_api_result(self):
+        if self.services:
+            return self.services
+
         headers = {
             'Accept': 'application/json',
             'X-HTTP-Method-Override': 'GET'
         }
+
         requestbody = {
             "attrs": [ "name", "state", "last_check_result", "host_name", "display_name" ],
             "joins": [ "host.name", "host.state", "host.last_check_result", "host.vars" ],
             "filter": self.config['filters']['services'],
         }
-        r = requests.get(request_url,
+
+        r = requests.get(
+            '{}/v1/objects/services'.format(self.config['icinga2_api']['baseurl']),
             headers=headers,
-            data=json.dumps(requestbody),
+            json=requestbody,
             auth=(self.config['icinga2_api']['username'], self.config['icinga2_api']['password']),
-            verify=False)
+            verify=False
+        )
 
         if (r.status_code == 200):
-            self.services = r.json()
+            self.services = r.json()['results']
         else:
             r.raise_for_status()
 
+        return self.services
+
 
     def prettify(self, text):
         for search, replace in self.config.get('prettify', {}).items():
@@ -60,31 +66,31 @@ class StatusPage:
                     <span class="badge badge-{2}">{3}</span>
                 </div>"""
 
-        for service in sorted(self.services['results'], key=lambda x: x['attrs']['display_name']):
+        for service in sorted(self.get_api_result(), key=lambda x: x['attrs']['display_name']):
             if service['attrs']['host_name'] == host:
                 state = int(service['attrs']['state'])
                 if state in (1, 2):
                     self.ragecounter += state
 
                 services.append(services_template.format(
-                    self.prettify(service['attrs']['display_name']), 
-                    state_to_design_mapping[state][0], 
+                    self.prettify(service['attrs']['display_name']),
+                    state_to_design_mapping[state][0],
                     state_to_design_mapping[state][1],
                 ))
-                
+
                 if not card_header:
                     if service['joins']['host']['state'] == 0:
                         card_header = services_hostname_template.format(
-                            host, 
-                            service['joins']['host']['vars']['pretty_name'], 
-                            'success', 
+                            host,
+                            service['joins']['host']['vars']['pretty_name'],
+                            'success',
                             'UP',
                         )
                     else:
                         card_header = services_hostname_template.format(
-                            host, 
-                            service['joins']['host']['vars']['pretty_name'], 
-                            'danger', 
+                            host,
+                            service['joins']['host']['vars']['pretty_name'],
+                            'danger',
                             'DOWN',
                         )
                         self.ragecounter += 100
@@ -102,7 +108,7 @@ class StatusPage:
     def render_service_details(self):
         # generate list of hosts by scanning services for unique host_name
         host_names = set()
-        for service in self.services['results']:
+        for service in self.get_api_result():
             host_names.add(service['attrs']['host_name'])
         # render html for each host_name
         html_output = []
@@ -132,10 +138,10 @@ class StatusPage:
 
     def __init__(self):
         self.config = tomlkit.loads(open('config.toml').read())
+        self.services = {}
         self.ragecounter = 0
 
 if __name__ == "__main__":
     page = StatusPage()
-    page.do_api_calls()
-    service_details  = page.render_service_details()
+    service_details = page.render_service_details()
     page.render_index_html(service_details)