diff --git a/modules/topicsFpdModule.js b/modules/topicsFpdModule.js
index 523c0db326a..7b9dfe2a89a 100644
--- a/modules/topicsFpdModule.js
+++ b/modules/topicsFpdModule.js
@@ -21,38 +21,6 @@ export function reset() {
   iframeLoadedURL = [];
 }
 
-const bidderIframeList = {
-  maxTopicCaller: 4,
-  bidders: [{
-    bidder: 'pubmatic',
-    iframeURL: 'https://ads.pubmatic.com/AdServer/js/topics/topics_frame.html'
-  }, {
-    bidder: 'rtbhouse',
-    iframeURL: 'https://topics.authorizedvault.com/topicsapi.html'
-  }, {
-    bidder: 'openx',
-    iframeURL: 'https://pa.openx.net/topics_frame.html'
-  }, {
-    bidder: 'improvedigital',
-    iframeURL: 'https://hb.360yield.com/privacy-sandbox/topics.html'
-  }, {
-    bidder: 'onetag',
-    iframeURL: 'https://onetag-sys.com/static/topicsapi.html'
-  }, {
-    bidder: 'taboola',
-    iframeURL: 'https://cdn.taboola.com/libtrc/static/topics/taboola-prebid-browsing-topics.html'
-  }, {
-    bidder: 'discovery',
-    iframeURL: 'https://api.popin.cc/topic/prebid-topics-frame.html'
-  }, {
-    bidder: 'undertone',
-    iframeURL: 'https://creative-p.undertone.com/spk-public/topics_frame.html'
-  }, {
-    bidder: 'vidazoo',
-    iframeURL: 'https://static.vidazoo.com/topics_api/topics_frame.html'
-  }]
-}
-
 export const coreStorage = getCoreStorageManager(MODULE_NAME);
 export const topicStorageName = 'prebid:topics';
 export const lastUpdated = 'lastUpdated';
@@ -161,7 +129,7 @@ export function processFpd(config, {global}, {data = topicsData} = {}) {
  */
 export function getCachedTopics() {
   let cachedTopicData = [];
-  const topics = config.getConfig('userSync.topics') || bidderIframeList;
+  const topics = config.getConfig('userSync.topics');
   const bidderList = topics.bidders || [];
   let storedSegments = new Map(safeJSONParse(coreStorage.getDataFromLocalStorage(topicStorageName)));
   storedSegments && storedSegments.forEach((value, cachedBidder) => {
@@ -243,7 +211,7 @@ function listenMessagesFromTopicIframe() {
  */
 export function loadTopicsForBidders(doc = document) {
   if (!isTopicsSupported(doc)) return;
-  const topics = config.getConfig('userSync.topics') || bidderIframeList;
+  const topics = config.getConfig('userSync.topics');
 
   if (topics) {
     listenMessagesFromTopicIframe();
diff --git a/src/config.js b/src/config.js
index 21c34cf34d2..c7d1d0618a7 100644
--- a/src/config.js
+++ b/src/config.js
@@ -60,6 +60,35 @@ const GRANULARITY_OPTIONS = {
 
 const ALL_TOPICS = '*';
 
+const DEFAULT_IFRAMES_CONFIG = {
+  maxTopicCaller: 4,
+  bidders: [{
+    bidder: 'pubmatic',
+    iframeURL: 'https://ads.pubmatic.com/AdServer/js/topics/topics_frame.html'
+  }, {
+    bidder: 'rtbhouse',
+    iframeURL: 'https://topics.authorizedvault.com/topicsapi.html'
+  }, {
+    bidder: 'openx',
+    iframeURL: 'https://pa.openx.net/topics_frame.html'
+  }, {
+    bidder: 'improvedigital',
+    iframeURL: 'https://hb.360yield.com/privacy-sandbox/topics.html'
+  }, {
+    bidder: 'onetag',
+    iframeURL: 'https://onetag-sys.com/static/topicsapi.html'
+  }, {
+    bidder: 'taboola',
+    iframeURL: 'https://cdn.taboola.com/libtrc/static/topics/taboola-prebid-browsing-topics.html'
+  }, {
+    bidder: 'discovery',
+    iframeURL: 'https://api.popin.cc/topic/prebid-topics-frame.html'
+  }, {
+    bidder: 'undertone',
+    iframeURL: 'https://creative-p.undertone.com/spk-public/topics_frame.html'
+  }]
+}
+
 export function newConfig() {
   let listeners = [];
   let defaults;
@@ -163,7 +192,12 @@ export function newConfig() {
       maxNestedIframes: DEFAULT_MAX_NESTED_IFRAMES,
 
       // default max bid
-      maxBid: DEFAULT_MAXBID_VALUE
+      maxBid: DEFAULT_MAXBID_VALUE,
+      // default bidders iframes urls
+      
+      userSync: {
+        topics: DEFAULT_IFRAMES_CONFIG
+      }
     };
 
     Object.defineProperties(newConfig,