diff --git a/modules/openxBidAdapter.js b/modules/openxBidAdapter.js
index 426362e0d9c..1b9766553c2 100644
--- a/modules/openxBidAdapter.js
+++ b/modules/openxBidAdapter.js
@@ -12,6 +12,7 @@ const OpenxAdapter = function OpenxAdapter() {
   const BIDDER_VERSION = '1.0.1';
   let startTime;
   let timeout = config.getConfig('bidderTimeout');
+  let shouldSendBoPixel = true;
 
   let pdNode = null;
 
@@ -64,7 +65,9 @@ const OpenxAdapter = function OpenxAdapter() {
       beaconParams.bp = adUnit.pub_rev;
       beaconParams.ts = adUnit.ts;
       addBidResponse(adUnit, bid);
-      buildBoPixel(adUnit.creative[0], beaconParams);
+      if (shouldSendBoPixel === true) {
+        buildBoPixel(adUnit.creative[0], beaconParams);
+      }
     }
   };
 
@@ -182,6 +185,16 @@ const OpenxAdapter = function OpenxAdapter() {
     return found;
   }
 
+  function formatCustomParms(customKey, customParams) {
+    let value = customParams[customKey];
+    if (Array.isArray(value)) {
+      // if value is an array, join them with commas first
+      value = value.join(',');
+    }
+    // return customKey=customValue format, escaping + to . and / to _ 
+    return (customKey + '=' + value).replace('+', '.').replace('/', '_')
+  }
+
   function buildRequest(bids, params, delDomain) {
     if (!utils.isArray(bids)) {
       return;
@@ -193,13 +206,35 @@ const OpenxAdapter = function OpenxAdapter() {
       return utils.parseSizesInput(bid.sizes).join(',');
     }).join('|');
 
+    let customParamsForAllBids = [];
+    let hasCustomParam = false;
     bids.forEach(function (bid) {
-      for (let customParam in bid.params.customParams) {
-        if (bid.params.customParams.hasOwnProperty(customParam)) {
-          params['c.' + customParam] = bid.params.customParams[customParam];
-        }
+      if (bid.params.customParams) {
+        let customParamsForBid = utils._map(Object.keys(bid.params.customParams), customKey => formatCustomParms(customKey, bid.params.customParams));
+        let formattedCustomParams = window.btoa(customParamsForBid.join('&'));
+        hasCustomParam = true;
+        customParamsForAllBids.push(formattedCustomParams);
+      } else {
+        customParamsForAllBids.push('');
+      }
+    });
+    if (hasCustomParam) {
+      params.tps = customParamsForAllBids.join('%2C');
+    }
+
+    let customFloorsForAllBids = [];
+    let hasCustomFloor = false;
+    bids.forEach(function (bid) {
+      if (bid.params.customFloor) {
+        customFloorsForAllBids.push(bid.params.customFloor * 1000);
+        hasCustomFloor = true;
+      } else {
+        customFloorsForAllBids.push(0);
       }
     });
+    if (hasCustomFloor) {
+      params.aumfs = customFloorsForAllBids.join('%2C');
+    }
 
     try {
       let queryString = buildQueryStringFromParams(params);
@@ -227,11 +262,15 @@ const OpenxAdapter = function OpenxAdapter() {
     }
 
     let delDomain = bids[0].params.delDomain;
+    let bcOverride = bids[0].params.bc;
 
     startTime = new Date(params.start);
     if (params.timeout) {
       timeout = params.timeout;
     }
+    if (bids[0].params.hasOwnProperty('sendBoPixel') && typeof (bids[0].params.sendBoPixel) === 'boolean') {
+      shouldSendBoPixel = bids[0].params.sendBoPixel;
+    }
 
     buildRequest(bids, {
       ju: currentURL,
@@ -243,7 +282,7 @@ const OpenxAdapter = function OpenxAdapter() {
       tws: getViewportDimensions(isIfr),
       ef: 'bt%2Cdb',
       be: 1,
-      bc: `${BIDDER_CONFIG}_${BIDDER_VERSION}`,
+      bc: bcOverride || `${BIDDER_CONFIG}_${BIDDER_VERSION}`,
       nocache: new Date().getTime()
     },
     delDomain);
diff --git a/test/spec/modules/openxBidAdapter_spec.js b/test/spec/modules/openxBidAdapter_spec.js
index 21ceb5a6dec..c08e8c256e6 100644
--- a/test/spec/modules/openxBidAdapter_spec.js
+++ b/test/spec/modules/openxBidAdapter_spec.js
@@ -136,12 +136,15 @@ describe('openx adapter tests', function () {
   });
   describe('test openx ad requests', () => {
     let spyAjax;
+    let spyBtoa;
     beforeEach(() => {
       spyAjax = sinon.spy(ajax, 'ajax');
+      spyBtoa = sinon.spy(window, 'btoa');
       sinon.stub(document.body, 'appendChild');
     });
     afterEach(() => {
       spyAjax.restore();
+      spyBtoa.restore();
       document.body.appendChild.restore();
     });
 
@@ -179,19 +182,96 @@ describe('openx adapter tests', function () {
             params: {
               delDomain: 'testdelDomain',
               unit: 1234,
-              customParams: {'test1': 'testval1'}
+              customParams: {'test1': 'testval1+', 'test2': ['testval2/', 'testval3']}
             }
           }
         ]
       };
       adapter.callBids(params);
-      sinon.assert.calledOnce(spyAjax);
 
+      sinon.assert.calledOnce(spyAjax);
+      sinon.assert.calledWith(spyBtoa, 'test1=testval1.&test2=testval2_,testval3');
       let bidUrl = spyAjax.getCall(0).args[0];
       expect(bidUrl).to.include('testdelDomain');
       expect(bidUrl).to.include('1234');
       expect(bidUrl).to.include('300x250,300x600');
-      expect(bidUrl).to.include('c.test1=testval1');
+    });
+
+    it('should send out custom floors on bids that have customFloors specified', () => {
+      let params = {
+        bids: [
+          {
+            sizes: [[300, 250], [300, 600]],
+            params: {
+              delDomain: 'testdelDomain',
+              unit: 1234,
+              customFloor: 1
+            }
+          },
+          {
+            sizes: [[320, 50]],
+            params: {
+              delDomain: 'testdelDomain',
+              unit: 1234
+            }
+          },
+          {
+            sizes: [[728, 90]],
+            params: {
+              delDomain: 'testdelDomain',
+              unit: 1234,
+              customFloor: 1.5
+            }
+          }
+        ]
+      };
+      adapter.callBids(params);
+
+      sinon.assert.calledOnce(spyAjax);
+      let bidUrl = spyAjax.getCall(0).args[0];
+      expect(bidUrl).to.include('testdelDomain');
+      expect(bidUrl).to.include('1234');
+      expect(bidUrl).to.include('300x250,300x600|320x50|728x90');
+      expect(bidUrl).to.include('aumfs=1000%2C0%2C1500');
+    });
+
+    it('should change bc param if configureable bc is specified', () => {
+      let params = {
+        bids: [
+          {
+            sizes: [[300, 250], [300, 600]],
+            params: {
+              delDomain: 'testdelDomain',
+              unit: 1234,
+              bc: 'hb_pb_test'
+            }
+          },
+          {
+            sizes: [[320, 50]],
+            params: {
+              delDomain: 'testdelDomain',
+              unit: 1234,
+              bc: 'hb_pb_test'
+            }
+          },
+          {
+            sizes: [[728, 90]],
+            params: {
+              delDomain: 'testdelDomain',
+              unit: 1234,
+              bc: 'hb_pb_test'
+            }
+          }
+        ]
+      };
+      adapter.callBids(params);
+
+      sinon.assert.calledOnce(spyAjax);
+      let bidUrl = spyAjax.getCall(0).args[0];
+      expect(bidUrl).to.include('testdelDomain');
+      expect(bidUrl).to.include('1234');
+      expect(bidUrl).to.include('300x250,300x600|320x50|728x90');
+      expect(bidUrl).to.include('bc=hb_pb_test');
     });
   });
 });