diff --git a/modules/openxRtbBidAdapter.js b/modules/openxRtbBidAdapter.js
new file mode 100644
index 00000000000..78e98a873f4
--- /dev/null
+++ b/modules/openxRtbBidAdapter.js
@@ -0,0 +1,302 @@
+import { config } from 'src/config';
+import { registerBidder } from '../src/adapters/bidderFactory';
+import {BANNER, VIDEO} from '../src/mediaTypes';
+import * as utils from '../src/utils';
+
+const bidderConfig = 'hb_pb_rtb';
+const bidderVersion = '3.x.x';
+
+export const spec = {
+  code: 'openxrtb',
+  supportedMediaTypes: [BANNER, VIDEO],
+  isBidRequestValid,
+  buildRequests,
+  interpretResponse,
+  getUserSyncs,
+};
+
+registerBidder(spec);
+
+/**
+ * from openxBidAdapter
+ * ported for feature parity
+ * @param bidRequest
+ * @return {boolean}
+ */
+function isBidRequestValid(bidRequest) {
+  const hasDelDomainOrPlatform = bidRequest.params.delDomain
+    || bidRequest.params.platform;
+
+  if (utils.deepAccess(bidRequest, 'mediaTypes.banner')
+      && hasDelDomainOrPlatform) {
+    return !!bidRequest.params.unit
+      || utils.deepAccess(bidRequest, 'mediaTypes.banner.sizes.length') > 0;
+  }
+
+  return !!(bidRequest.params.unit && hasDelDomainOrPlatform);
+}
+
+let impToBidIdMap = {};
+function buildRequests(validBidRequests, bidderRequest) {
+  const hasBids = bidderRequest.bids.length > 0;
+  const transactionID = hasBids ? bidderRequest.bids[0].transactionId : null;
+  if (!hasBids || !transactionID) {
+    return [];
+  }
+
+  const bc = bidderRequest.bids[0].params.bc || `${bidderConfig}_${bidderVersion}`;
+  const delDomain = bidderRequest.bids[0].params.delDomain || null;
+  const platformId = bidderRequest.bids[0].params.platform || null;
+  const configPageUrl = config.getConfig('pageUrl');
+  const commonImpFieldsMap = getCommonImpFieldsMap(bidderRequest,
+    delDomain, platformId);
+  const maybeDoNotTrack = () => !window.navigator.doNotTrack
+    ? {}
+    : {dnt: window.navigator.doNotTrack};
+  const maybePlatformIdOrDelDomain = ((delDomain, platId) => {
+    let fields = {};
+    if (platId) {
+      fields = {...fields, platformId: platId};
+    }
+    if (delDomain) {
+      fields = {...fields, delDomain};
+    }
+    return fields;
+  });
+
+  // update imp to bid map with current request bids
+  impToBidIdMap = validBidRequests.reduce((impMap, bidRequest) => ({
+    ...impMap,
+    [bidRequest.transactionId]: bidRequest.bidId,
+  }), {});
+  const data = {
+    id: bidderRequest.auctionId,
+    cur: ['USD'],
+    at: 1,   // (1: first-price-, 2: second-price-) auction
+    tmax: config.getConfig('bidderTimeout'),  // defaults to 3000msecs
+    site: {
+      domain: configPageUrl || utils.getWindowTop().location.hostname,
+      page: configPageUrl
+              || bidderRequest.refererInfo.canonicalUrl
+              || bidderRequest.refererInfo.referer,
+      ref: bidderRequest.refererInfo.referer,
+    },
+    user: getUser(validBidRequests[0].userId, validBidRequests[0].userIdAsEids),
+    regs: {
+      coppa: config.getConfig('coppa') === true ? 1 : 0,
+    },
+    ext: {
+      ...maybePlatformIdOrDelDomain(delDomain, platformId),
+      bc,
+    },
+    imp: getImps(validBidRequests, commonImpFieldsMap),
+    device: {
+      ...maybeDoNotTrack(),
+      ua: window.navigator.userAgent,
+      language: window.navigator.language.split('-').shift(),
+    },
+  };
+  return [{
+    method: 'POST',
+    url: 'https://rtb.openx.net/openrtbb/prebidjs',
+    data,
+    options: {
+      contentType: 'application/json',
+    }
+  }];
+}
+
+/**
+ * converts any valid bid request to an impression field
+ * see: http://prebid.org/dev-docs/bidder-adaptor.html#bidrequest-parameters
+ * @param validBidRequests
+ * @param commonImpFieldsMap
+ * @return openRTB imp[]
+ */
+function getImps(validBidRequests, commonImpFieldsMap) {
+  const maybeImpExt = customParams => customParams ? {ext: {customParams}} : {};
+  const maybeImpRegs = regs => Object.keys(regs.ext).length > 0 ? {regs} : null;
+  const maybeImpUser = user => Object.keys(user.ext).length > 0 ? {user} : null;
+
+  return validBidRequests.map(bidRequest => ({
+    id: bidRequest.transactionId,
+    tagid: bidRequest.params.unit,
+    bidfloor: bidRequest.params.customFloor || 0,  //default bidfloorcurrency is USD
+    ...getBannerImp(bidRequest),
+    ...getVideoImp(bidRequest),
+    ...maybeImpRegs(commonImpFieldsMap.regs),
+    ...maybeImpUser(commonImpFieldsMap.user),
+    ...maybeImpExt(bidRequest.params.customParams),
+  }));
+}
+
+function getBannerImp(bidRequest) {
+  if (!bidRequest.mediaTypes.banner) {
+    return null;
+  }
+  // each size element is of the format [w, h]
+  // mediaTypeSizes is an array of size elements, e.g. [[w, h], [w, h], ...]
+  const toBannerImpFormatArray = mediaTypeSizes =>
+    mediaTypeSizes.map(([w, h]) => ({w, h}));
+  return {
+    banner: {
+      id: bidRequest.bidId,
+      topframe: utils.inIframe() ? 1 : 0,
+      format: toBannerImpFormatArray(bidRequest.mediaTypes.banner.sizes),
+    },
+  };
+}
+
+/**
+ * for the openrtb param, see: https://docs.openx.com/Content/developers/containers/prebid-video-adapter.html
+ * @param bidRequest
+ * @return {null|{video: {w: *, h: *, id: number}}}
+ */
+function getVideoImp(bidRequest) {
+  if (!bidRequest.mediaTypes.video) {
+    return null;
+  }
+  if (bidRequest.params.openrtb) {
+    return {
+      video: {...bidRequest.params.openrtb, id: 1},
+    };
+  }
+  const [w, h] = bidRequest.mediaTypes.video.playerSize[0];
+  return {
+    video: {
+      id: bidRequest.bidId,
+      w,
+      h,
+    },
+  };
+}
+
+/**
+ * typical fields are gdpr, usp and maybe global hb_pb settings
+ * @param bidderRequest see auction.js:L30
+ * @param delDomain string?
+ * @param platformId string?
+ * @return {{ext: {customParams: ?}, regs: {ext: {us_privacy: string, gdpr: boolean}}, user: {ext: {consent: string}}}}
+ */
+function getCommonImpFieldsMap(bidderRequest, delDomain, platformId) {
+  const doesGdprApply = utils.deepAccess(bidderRequest,
+    'gdprConsent.gdprApplies', null);
+  const maybeEmptyGdprConsentString = utils.deepAccess(bidderRequest,
+    'gdprConsent.consentString', null);
+
+  const stripNullVals = map =>
+    Object.entries(map)
+      .filter(([key, val]) => null !== val)    // filter out null values
+      // convert the rest back to fields
+      .reduce((newMap, [key, val]) => ({
+        ...newMap,
+        [key]: typeof val !== 'object' ? val : stripNullVals(val),
+      }), {});
+
+  return stripNullVals({
+    regs: {
+      ext: {
+        gdpr: doesGdprApply !== null ? !!doesGdprApply : null,
+        us_privacy: bidderRequest.uspConsent || null,
+      },
+    },
+    user: {
+      ext: {
+        consent: maybeEmptyGdprConsentString,
+      },
+    },
+  });
+}
+
+/**
+ * gets a userId field by parsing pbjs user id module enrichments
+ * @param userIdDataMap
+ * @param eids openrtb eids https://github.com/prebid/Prebid.js/blob/3.12.0/modules/userId/index.js#L280
+ */
+function getUser(userIdDataMap, eids) {
+  if (!userIdDataMap) {
+    return {};
+  }
+
+  const maybeDigitrust = getMaybeDigitrustId(userIdDataMap);
+  return {
+    ext: {
+      eids,
+      ...maybeDigitrust,
+    }
+  };
+
+  function getMaybeDigitrustId(userIdDataMap) {
+    const maybeDigitrustData = userIdDataMap.digitrustid && userIdDataMap.digitrustid.data;
+    const {id, keyv} = maybeDigitrustData || {};
+    if (!id) {
+      return null;
+    }
+    return {digitrust: {id, keyv,}};
+  }
+}
+
+function interpretResponse(resp, req) {
+  const oxSeatBidName = 'OpenX';
+  const oxDefaultBidRespTTLSecs = 300;
+  const respBody = resp.body;
+  if ('nbr' in respBody) {
+    return [];
+  }
+  const oxSeatBid = respBody.seatbid
+    .find(seatbid => seatbid.seat === oxSeatBidName) || {bid: []};
+
+  return oxSeatBid.bid.map(bid => ({
+    requestId: impToBidIdMap[bid.impid],
+    cpm: bid.price,
+    width: bid.w,
+    height: bid.h,
+    creativeId: bid.crid,
+    dealId: bid.dealid,
+    currency: respBody.cur || "USD",
+    netRevenue: true,  // true?
+    ttl: oxDefaultBidRespTTLSecs,  // secs before the bid expires and become unusable, from oxBidAdapter
+    ad: bid.adm,
+  }));
+}
+
+/**
+ * from openxBidAdapter
+ * ported for feature parity
+ * @param syncOptions
+ * @param responses
+ * @param gdprConsent
+ * @param uspConsent
+ * @return {{type: (string), url: (*|string)}[]}
+ */
+function getUserSyncs(syncOptions, responses, gdprConsent, uspConsent) {
+  if (syncOptions.iframeEnabled || syncOptions.pixelEnabled) {
+    let pixelType = syncOptions.iframeEnabled ? 'iframe' : 'image';
+    let url = utils.deepAccess(responses, '0.body.ads.pixels') ||
+      utils.deepAccess(responses, '0.body.pixels') ||
+      getDefaultSyncUrl(gdprConsent, uspConsent);
+
+    return [{
+      type: pixelType,
+      url: url
+    }];
+  }
+}
+
+function getDefaultSyncUrl(gdprConsent, uspConsent) {
+  let url = 'https://u.openx.net/w/1.0/pd';
+  let queryParamStrings = [];
+
+  if (gdprConsent) {
+    queryParamStrings.push('gdpr=' + (gdprConsent.gdprApplies ? 1 : 0));
+    queryParamStrings.push('gdpr_consent=' + encodeURIComponent(gdprConsent.consentString || ''));
+  }
+
+  // CCPA
+  if (uspConsent) {
+    queryParamStrings.push('us_privacy=' + encodeURIComponent(uspConsent));
+  }
+
+  return `${url}${queryParamStrings.length > 0 ? '?' + queryParamStrings.join('&') : ''}`;
+}
+