diff --git a/versionwarning/_static/js/versionwarning.js b/versionwarning/_static/js/versionwarning.js
index 8730da3..76c5244 100644
--- a/versionwarning/_static/js/versionwarning.js
+++ b/versionwarning/_static/js/versionwarning.js
@@ -1 +1 @@
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\ No newline at end of file
diff --git a/versionwarning/_static/js/versionwarning.src.js b/versionwarning/_static/js/versionwarning.src.js
index dd1f631..5d5e464 100644
--- a/versionwarning/_static/js/versionwarning.src.js
+++ b/versionwarning/_static/js/versionwarning.src.js
@@ -80,6 +80,16 @@ function checkVersion(config) {
     });
 }
 
+function handleBanner(config) {
+    console.debug("handleBanner");
+    if (config.banner.custom) {
+        injectCustomWarningBanner(config);
+    }
+    else {
+        checkVersion(config);
+    }
+}
+
 function init() {
     console.debug("init");
     $.ajax({
@@ -90,11 +100,30 @@ function init() {
             if (banner) {
                 console.debug("There is already a banner added. No checking versions.")
             }
-            else if (config.banner.custom) {
-                injectCustomWarningBanner(config);
+            else if (config.meta.json_url && !config.meta.retrieve_data_from_api) {
+                console.debug("Retrieving dynamic data from 'json_url'.")
+                $.ajax({
+                    dataType: "json",
+                    cache: "false",
+                    url: config.meta.json_url,
+                    success: function(dynamic_config) {
+                        if (config.version.slug in dynamic_config) {
+                            handleBanner(dynamic_config[config.version.slug]);
+                        }
+                        else if (config.meta.only_override_banner) {
+                            handleBanner(config);
+                        }
+                        else {
+                            log.error("JSON data from " + config.meta.json_url + " does not have a warning banner for " + config.version.slug);
+                        }
+                    },
+                    error: function() {
+                        console.error("Error loading dynamic config object");
+                    },
+                });
             }
             else {
-                checkVersion(config);
+                handleBanner(config);
             }
         },
         error: function() {
diff --git a/versionwarning/exceptions.py b/versionwarning/exceptions.py
new file mode 100644
index 0000000..3689a98
--- /dev/null
+++ b/versionwarning/exceptions.py
@@ -0,0 +1,16 @@
+# -*- coding: utf-8 -*-
+
+
+class ConfigError(Exception):
+    """
+    Incompatible config exception.
+
+    This exception is risen when the extension detects configs that are
+    incompatible or that depends each other.
+    """
+
+    NO_JSON_URL = (
+        'No URL defined to retrieve JSON data. '
+        'The URL is mandatory when "versionwarning_retrieve_data_from_api" '
+        'is True'
+    )
diff --git a/versionwarning/extension.py b/versionwarning/extension.py
index 9e0d409..85ed61b 100644
--- a/versionwarning/extension.py
+++ b/versionwarning/extension.py
@@ -29,6 +29,11 @@ def setup(app):
     app.add_config_value('versionwarning_project_slug', os.environ.get('READTHEDOCS_PROJECT', None), 'html')
     app.add_config_value('versionwarning_project_version', os.environ.get('READTHEDOCS_VERSION', None), 'html')
 
+
+    app.add_config_value('versionwarning_retrieve_data_from_api', True, 'html')
+    app.add_config_value('versionwarning_json_url', None, 'html')
+    app.add_config_value('versionwarning_only_override_banner', True, 'html')
+
     if sphinx.version_info >= (1, 8):
         # ``config-initied`` requires Sphinx >= 1.8
         app.connect('config-inited', generate_versionwarning_data_json)
diff --git a/versionwarning/signals.py b/versionwarning/signals.py
index d80da4c..53fbe6b 100644
--- a/versionwarning/signals.py
+++ b/versionwarning/signals.py
@@ -3,6 +3,8 @@
 import json
 import os
 
+from versionwarning.exceptions import ConfigError
+
 
 STATIC_PATH = os.path.join(os.path.dirname(__file__), '_static')
 JSON_DATA_FILENAME = 'versionwarning-data.json'
@@ -27,6 +29,9 @@ def generate_versionwarning_data_json(app, config=None, **kwargs):
     if config is None:
         config = app.config
 
+    if not config.versionwarning_retrieve_data_from_api and not config.versionwarning_json_url:
+        raise ConfigError(ConfigError.NO_JSON_URL)
+
     if config.versionwarning_project_version in config.versionwarning_messages:
         custom = True
         message = config.versionwarning_messages.get(config.versionwarning_project_version)
@@ -43,15 +48,14 @@ def generate_versionwarning_data_json(app, config=None, **kwargs):
         admonition_type=config.versionwarning_admonition_type,
     )
 
-    data = json.dumps({
-        'meta': {
-            'api_url': config.versionwarning_api_url,
-        },
+    data = {
         'banner': {
-            'html': banner_html,
-            'id_div': config.versionwarning_banner_id_div,
-            'body_selector': config.versionwarning_body_selector,
-            'custom': custom,
+            config.versionwarning_project_version: {
+                'html': banner_html,
+                'id_div': config.versionwarning_banner_id_div,
+                'body_selector': config.versionwarning_body_selector,
+                'custom': custom,
+            },
         },
         'project': {
             'slug': config.versionwarning_project_slug,
@@ -59,14 +63,29 @@ def generate_versionwarning_data_json(app, config=None, **kwargs):
         'version': {
             'slug': config.versionwarning_project_version,
         },
-    }, indent=4)
+    }
+
+    if config.versionwarning_retrieve_data_from_api:
+        url_key = 'api_url'
+        url = config.versionwarning_api_url
+    else:
+        url_key = 'json_url'
+        url = config.versionwarning_json_url
+
+    data.update({
+        'meta': {
+            url_key: url,
+            'retrieve_data_from_api': config.versionwarning_retrieve_data_from_api,
+            'only_override_banner': config.versionwarning_only_override_banner,
+        },
+    })
 
     data_path = os.path.join(STATIC_PATH, 'data')
     if not os.path.exists(data_path):
         os.mkdir(data_path)
 
     with open(os.path.join(data_path, JSON_DATA_FILENAME), 'w') as f:
-        f.write(data)
+        f.write(json.dumps(data, indent=4))
 
     # Add the path where ``versionwarning-data.json`` file and
     # ``versionwarning.js`` are saved