diff --git a/modules/33acrossBidAdapter.js b/modules/33acrossBidAdapter.js
index 15792240fdd..7b26f66331f 100644
--- a/modules/33acrossBidAdapter.js
+++ b/modules/33acrossBidAdapter.js
@@ -1,11 +1,12 @@
-import { userSync } from 'src/userSync'
+import { uniques } from 'src/utils';
 const { registerBidder } = require('../src/adapters/bidderFactory');
 const { config } = require('../src/config');
-
 const BIDDER_CODE = '33across';
 const END_POINT = 'https://ssc.33across.com/api/v1/hb';
 const SYNC_ENDPOINT = 'https://de.tynt.com/deb/v2?m=xch&rt=html';
 
+const adapterState = {};
+
 // All this assumes that only one bid is ever returned by ttx
 function _createBidResponse(response) {
   return {
@@ -42,19 +43,21 @@ function _createServerRequest(bidRequest) {
     }
   }
   ttxRequest.site = { id: params.siteId };
+
   // Go ahead send the bidId in request to 33exchange so it's kept track of in the bid response and
   // therefore in ad targetting process
   ttxRequest.id = bidRequest.bidId;
+
   // Finally, set the openRTB 'test' param if this is to be a test bid
   if (params.test === 1) {
     ttxRequest.test = 1;
   }
 
   /*
-   * Now construt the full server request
+   * Now construct the full server request
    */
   const options = {
-    contentType: 'application/json',
+    contentType: 'text/plain',
     withCredentials: true
   };
   // Allow the ability to configure the HB endpoint for testing purposes.
@@ -70,6 +73,17 @@ function _createServerRequest(bidRequest) {
   }
 }
 
+// Sync object will always be of type iframe for TTX
+function _createSync(siteId) {
+  const ttxSettings = config.getConfig('ttxSettings');
+  const syncUrl = (ttxSettings && ttxSettings.syncUrl) || SYNC_ENDPOINT;
+
+  return {
+    type: 'iframe',
+    url: `${syncUrl}&id=${siteId}`
+  }
+}
+
 function _getFormatSize(sizeArr) {
   return {
     w: sizeArr[0],
@@ -78,24 +92,6 @@ function _getFormatSize(sizeArr) {
   }
 }
 
-// Register one sync per bid since each ad unit may potenitally be linked to a uniqe guid
-// Sync type will always be 'iframe' for 33Across
-function _registerUserSyncs(requestData) {
-  let ttxRequest;
-  try {
-    ttxRequest = JSON.parse(requestData);
-  } catch (err) {
-    // No point in trying to register sync since the requisite data cannot be parsed.
-    return;
-  }
-  const ttxSettings = config.getConfig('ttxSettings');
-
-  let syncUrl = (ttxSettings && ttxSettings.syncUrl) || SYNC_ENDPOINT;
-
-  syncUrl = `${syncUrl}&id=${ttxRequest.site.id}`;
-  userSync.registerSync('iframe', BIDDER_CODE, syncUrl);
-}
-
 function isBidRequestValid(bid) {
   if (bid.bidder !== BIDDER_CODE || typeof bid.params === 'undefined') {
     return false;
@@ -108,18 +104,15 @@ function isBidRequestValid(bid) {
   return true;
 }
 
-// NOTE: At this point, 33exchange only accepts request for a single impression
+// NOTE: At this point, TTX only accepts request for a single impression
 function buildRequests(bidRequests) {
+  adapterState.uniqueSiteIds = bidRequests.map(req => req.params.siteId).filter(uniques);
+
   return bidRequests.map(_createServerRequest);
 }
 
 // NOTE: At this point, the response from 33exchange will only ever contain one bid i.e. the highest bid
 function interpretResponse(serverResponse, bidRequest) {
-  // Register user sync first
-  if (bidRequest && bidRequest.data) {
-    _registerUserSyncs(bidRequest.data);
-  }
-
   const bidResponses = [];
 
   // If there are bids, look at the first bid of the first seatbid (see NOTE above for assumption about ttx)
@@ -130,11 +123,17 @@ function interpretResponse(serverResponse, bidRequest) {
   return bidResponses;
 }
 
+// Register one sync per unique guid
+function getUserSyncs(syncOptions) {
+  return (syncOptions.iframeEnabled) ? adapterState.uniqueSiteIds.map(_createSync) : ([]);
+}
+
 const spec = {
   code: BIDDER_CODE,
   isBidRequestValid,
   buildRequests,
-  interpretResponse
+  interpretResponse,
+  getUserSyncs
 }
 
 registerBidder(spec);
diff --git a/modules/33acrossBidAdapter.md b/modules/33acrossBidAdapter.md
index c4eb319c157..bdb2b944861 100644
--- a/modules/33acrossBidAdapter.md
+++ b/modules/33acrossBidAdapter.md
@@ -3,7 +3,7 @@
 ```
 Module Name:  33Across Bid Adapter
 Module Type:  Bidder Adapter
-Maintainer: aparna.hegde@33across.com
+Maintainer: headerbidding@33across.com
 ```
 
 # Description
@@ -24,72 +24,9 @@ var adUnits = [
     bids: [{
         bidder: '33across',
         params: {
-            siteId: 'pub1234',     
-            productId: 'infeed'     
+            siteId: 'examplePub1234',     
+            productId: 'siab'     
         }
     }]
 }
 ```
-
-# Ad Unit and Setup: For Testing
-In order to receive bids please map localhost to (any) test domain.
-
-```
-<--! Prebid Config section >
-<script> 
-    var PREBID_TIMEOUT = 3000;
-    var adUnits = [
-    {
-        code: '33across-hb-ad-123456-1',
-        sizes: [
-            [300, 250], 
-            [728, 90]
-        ],     
-        bids: [{
-            bidder: '33across',
-            params: {
-            site: {
-                id: 'aRlI5W_9yr5jkxacwqm_6r',
-                page: "http://thinkbabynames.com/baby-mcbabyface",
-                ext: {
-                    ttx: {
-                        ssp_configs: [
-                            {
-                            "name": "index",
-                            "enabled": false
-                            },
-                            {
-                            "name": "rubicon",
-                            "enabled": true
-                            },
-                            {
-                            "name": "33xchange",
-                            "enabled": false
-                            }
-                        ]
-                    }
-                }
-            },
-            productId: 'infeed'
-        }
-        }]
-    }
-    ];
-    
-    var pbjs = pbjs || {};
-    pbjs.que = pbjs.que || [];
-
-    // Adjust bid CPM to ensure it wins the auction (USED ONLY FOR TESTING). Need to do this since test bids have too low a CPM
-    pbjs.bidderSettings = {
-      '33across': {
-        bidCpmAdjustment : function(bidCpm, bid){
-          // adjust the bid in real time before the auction takes place, only do so for valid bids ignore no bids
-          if (bid.w !== 0 && bid.h !== 0 && bidCpm !== 0) {
-            return bidCpm + 0.50;
-          }
-        }
-      }
-    };
-  </script>
-  <!-- End Prebid Config section>
-  ```
\ No newline at end of file
diff --git a/test/spec/modules/33acrossBidAdapter_spec.js b/test/spec/modules/33acrossBidAdapter_spec.js
index ff701d265a7..8ca2f3da902 100644
--- a/test/spec/modules/33acrossBidAdapter_spec.js
+++ b/test/spec/modules/33acrossBidAdapter_spec.js
@@ -145,7 +145,7 @@ describe('33acrossBidAdapter:', function () {
         'url': END_POINT,
         'data': JSON.stringify(ttxRequest),
         'options': {
-          'contentType': 'application/json',
+          'contentType': 'text/plain',
           'withCredentials': true
         }
       }
@@ -193,7 +193,7 @@ describe('33acrossBidAdapter:', function () {
         url: 'https://foo.com/hb/',
         data: JSON.stringify(ttxRequest),
         options: {
-          contentType: 'application/json',
+          contentType: 'text/plain',
           withCredentials: true
         }
       };
@@ -243,7 +243,7 @@ describe('33acrossBidAdapter:', function () {
         url: 'https://foo.com/hb/',
         data: JSON.stringify(ttxRequest),
         options: {
-          contentType: 'application/json',
+          contentType: 'text/plain',
           withCredentials: true
         }
       };
@@ -293,7 +293,7 @@ describe('33acrossBidAdapter:', function () {
         url: '//staging-ssc.33across.com/api/v1/hb',
         data: JSON.stringify(this.ttxRequest),
         options: {
-          contentType: 'application/json',
+          contentType: 'text/plain',
           withCredentials: false
         }
       };
@@ -404,43 +404,70 @@ describe('33acrossBidAdapter:', function () {
         expect(interpretResponse({ body: serverResponse }, this.serverRequest)).to.deep.equal([ bidResponse ]);
       });
     });
+  });
 
-    context('and register user sync', function() {
-      it('via the production endpoint', function() {
-        const spy = this.sandbox.spy(userSync, 'registerSync');
-        const serverResponse = {
-          cur: 'USD',
-          ext: {},
-          id: 'b1',
-          seatbid: []
+  describe('getUserSyncs', function() {
+    beforeEach(function() {
+      this.syncs = [
+        {
+          type: 'iframe',
+          url: 'https://de.tynt.com/deb/v2?m=xch&rt=html&id=id1'
+        },
+        {
+          type: 'iframe',
+          url: 'https://de.tynt.com/deb/v2?m=xch&rt=html&id=id2'
+        },
+      ];
+      this.bidRequests = [
+        {
+          bidId: 'b1',
+          bidder: '33across',
+          bidderRequestId: 'b1a',
+          params: {
+            siteId: 'id1',
+            productId: 'foo'
+          },
+          adUnitCode: 'div-id',
+          auctionId: 'r1',
+          sizes: [
+            [ 300, 250 ]
+          ],
+          transactionId: 't1'
+        },
+        {
+          bidId: 'b2',
+          bidder: '33across',
+          bidderRequestId: 'b2a',
+          params: {
+            siteId: 'id2',
+            productId: 'foo'
+          },
+          adUnitCode: 'div-id',
+          auctionId: 'r1',
+          sizes: [
+            [ 300, 250 ]
+          ],
+          transactionId: 't2'
         }
-        interpretResponse({ body: serverResponse }, this.serverRequest);
-        const syncUrl = `${SYNC_ENDPOINT}&id=${this.ttxRequest.site.id}`;
+      ];
+    });
 
-        const registerSyncCalled = spy.calledWith('iframe', '33across', syncUrl);
-        expect(registerSyncCalled).to.be.true;
+    context('when iframe is not enabled', function() {
+      it('returns empty sync array', function() {
+        const syncOptions = {};
+        buildRequests(this.bidRequests);
+        expect(getUserSyncs(syncOptions)).to.deep.equal([]);
       });
+    });
 
-      it('via the test endpoint', function() {
-        const spy = this.sandbox.spy(userSync, 'registerSync');
-
-        this.sandbox.stub(config, 'getConfig').callsFake(() => {
-          return {
-            'syncUrl': 'https://foo.com/deb/v2?m=xch'
-          }
-        });
-
-        const serverResponse = {
-          cur: 'USD',
-          ext: {},
-          id: 'b1',
-          seatbid: []
-        }
-        interpretResponse({ body: serverResponse }, this.serverRequest);
-        const syncUrl = `https://foo.com/deb/v2?m=xch&id=${this.ttxRequest.site.id}`;
-
-        const registerSyncCalled = spy.calledWith('iframe', '33across', syncUrl);
-        expect(registerSyncCalled).to.be.true;
+    context('when iframe is enabled', function() {
+      it('returns sync array equal to number of unique siteIDs', function() {
+        const syncOptions = {
+          iframeEnabled: true
+        };
+        buildRequests(this.bidRequests);
+        const syncs = getUserSyncs(syncOptions);
+        expect(syncs).to.deep.equal(this.syncs);
       });
     });
   });