diff --git a/modules/projectLimeLightBidAdapter.js b/modules/projectLimeLightBidAdapter.js
new file mode 100644
index 00000000000..b0de181315e
--- /dev/null
+++ b/modules/projectLimeLightBidAdapter.js
@@ -0,0 +1,125 @@
+import { registerBidder } from '../src/adapters/bidderFactory';
+import { BANNER, VIDEO } from '../src/mediaTypes';
+import {ajax} from '../src/ajax';
+import * as utils from '../src/utils';
+
+const BIDDER_CODE = 'project-limelight';
+const URL = '//ads.project-limelight.com/hb';
+
+/**
+ * Determines whether or not the given bid response is valid.
+ *
+ * @param {object} bid The bid to validate.
+ * @return boolean True if this is a valid bid, and false otherwise.
+ */
+function isBidResponseValid(bid) {
+  if (!bid.requestId || !bid.cpm || !bid.creativeId || !bid.ttl || !bid.currency) {
+    return false;
+  }
+  switch (bid.mediaType) {
+    case BANNER:
+      return Boolean(bid.width && bid.height && bid.ad);
+    case VIDEO:
+      return Boolean(bid.vastXml || bid.vastUrl);
+  }
+  return false;
+}
+
+function extractBidSizes(bid) {
+  const bidSizes = [];
+
+  bid.sizes.forEach(size => {
+    bidSizes.push({
+      width: size[0],
+      height: size[1]
+    });
+  });
+
+  return bidSizes;
+}
+
+export const spec = {
+  code: BIDDER_CODE,
+  supportedMediaTypes: [BANNER, VIDEO],
+
+  /**
+   * Determines whether or not the given bid request is valid.
+   *
+   * @param {object} bid The bid to validate.
+   * @return boolean True if this is a valid bid, and false otherwise.
+   */
+  isBidRequestValid: (bid) => {
+    return Boolean(bid.bidId && bid.params);
+  },
+
+  /**
+   * Make a server request from the list of BidRequests.
+   *
+   * @return ServerRequest Info describing the request to the server.
+   */
+  buildRequests: (validBidRequests, bidderRequest) => {
+    let winTop;
+    try {
+      winTop = window.top;
+      winTop.location.toString();
+    } catch (e) {
+      utils.logMessage(e);
+      winTop = window;
+    };
+    const placements = [];
+    const request = {
+      'secure': (location.protocol === 'https:'),
+      'deviceWidth': winTop.screen.width,
+      'deviceHeight': winTop.screen.height,
+      'adUnits': placements
+    };
+    for (let i = 0; i < validBidRequests.length; i++) {
+      const bid = validBidRequests[i];
+      const params = bid.params;
+      placements.push({
+        id: params.adUnitId,
+        bidId: bid.bidId,
+        transactionId: bid.transactionId,
+        sizes: extractBidSizes(bid),
+        type: params.adUnitType.toUpperCase()
+      });
+    }
+    return {
+      method: 'POST',
+      url: URL,
+      data: request
+    };
+  },
+
+  onBidWon: (bid) => {
+    const cpm = bid.pbMg;
+    if (bid.nurl !== '') {
+      bid.nurl = bid.nurl.replace(
+        /\$\{AUCTION_PRICE\}/,
+        cpm
+      );
+      ajax(bid.nurl, null);
+    };
+  },
+
+  /**
+   * Unpack the response from the server into a list of bids.
+   *
+   * @param {*} serverResponse A successful response from the server.
+   * @return {Bid[]} An array of bids which were nested inside the server.
+   */
+  interpretResponse: (bidResponses) => {
+    const res = [];
+    const bidResponsesBody = bidResponses.body;
+    const len = bidResponsesBody.length;
+    for (let i = 0; i < len; i++) {
+      const bid = bidResponsesBody[i];
+      if (isBidResponseValid(bid)) {
+        res.push(bid);
+      }
+    }
+    return res;
+  },
+};
+
+registerBidder(spec);
diff --git a/modules/projectLimeLightBidAdapter.md b/modules/projectLimeLightBidAdapter.md
new file mode 100644
index 00000000000..71621983b89
--- /dev/null
+++ b/modules/projectLimeLightBidAdapter.md
@@ -0,0 +1,55 @@
+# Overview
+
+```
+Module Name: Project LimeLight SSP Adapter
+Module Type: Bidder Adapter
+Maintainer: engineering@project-limelight.com
+```
+
+# Description
+
+Module that connects to Project Limelight SSP demand sources
+
+# Test Parameters for banner
+```
+    var adUnits = [{
+                code: 'placementCode',
+                sizes: [[300, 250]],
+                bids: [{
+                        bidder: 'project-limelight',
+                        params: {
+                            adUnitId: 0,
+                            adUnitType: 'banner'
+                        }
+                    }]
+                }
+            ];
+```
+
+# Test Parameters for video
+```
+var videoAdUnit = [{
+                code: 'video1',
+                sizes: [[300, 250]],
+                bids: [{
+                        bidder: 'project-limelight',
+                        params: {
+                            adUnitId: 0,
+                            adUnitType: 'video'
+                        }
+                }]
+            }];
+```
+
+# Configuration
+
+The Project Limelight Bid Adapter expects Prebid Cache(for video) to be enabled so that we can store and retrieve a single vastXml.
+
+```
+pbjs.setConfig({
+    usePrebidCache: true,
+    cache: {
+        url: 'https://prebid.adnxs.com/pbc/v1/cache'
+    }
+});
+```
diff --git a/test/spec/modules/projectLimeLightBidAdapter_spec.js b/test/spec/modules/projectLimeLightBidAdapter_spec.js
new file mode 100644
index 00000000000..434b3fbccb5
--- /dev/null
+++ b/test/spec/modules/projectLimeLightBidAdapter_spec.js
@@ -0,0 +1,170 @@
+import {expect} from 'chai';
+import {spec} from '../../../modules/projectLimeLightBidAdapter';
+
+describe('ProjectLimeLightAdapter', function () {
+  let bid = {
+    bidId: '2dd581a2b6281d',
+    bidder: 'project-limelight',
+    bidderRequestId: '145e1d6a7837c9',
+    params: {
+      adUnitId: 123,
+      adUnitType: 'banner'
+    },
+    placementCode: 'placement_0',
+    auctionId: '74f78609-a92d-4cf1-869f-1b244bbfb5d2',
+    sizes: [[300, 250]],
+    transactionId: '3bb2f6da-87a6-4029-aeb0-bfe951372e62'
+  };
+
+  describe('buildRequests', function () {
+    let serverRequest = spec.buildRequests([bid]);
+    it('Creates a ServerRequest object with method, URL and data', function () {
+      expect(serverRequest).to.exist;
+      expect(serverRequest.method).to.exist;
+      expect(serverRequest.url).to.exist;
+      expect(serverRequest.data).to.exist;
+    });
+    it('Returns POST method', function () {
+      expect(serverRequest.method).to.equal('POST');
+    });
+    it('Returns valid URL', function () {
+      expect(serverRequest.url).to.equal('//ads.project-limelight.com/hb');
+    });
+    it('Returns valid data if array of bids is valid', function () {
+      let data = serverRequest.data;
+      expect(data).to.be.an('object');
+      expect(data).to.have.all.keys('deviceWidth', 'deviceHeight', 'secure', 'adUnits');
+      expect(data.deviceWidth).to.be.a('number');
+      expect(data.deviceHeight).to.be.a('number');
+      expect(data.secure).to.be.a('boolean');
+      let adUnits = data['adUnits'];
+      for (let i = 0; i < adUnits.length; i++) {
+        let adUnit = adUnits[i];
+        expect(adUnit).to.have.all.keys('id', 'bidId', 'type', 'sizes', 'transactionId');
+        expect(adUnit.id).to.be.a('number');
+        expect(adUnit.bidId).to.be.a('string');
+        expect(adUnit.type).to.be.a('string');
+        expect(adUnit.transactionId).to.be.a('string');
+        expect(adUnit.sizes).to.be.an('array');
+      }
+    });
+    it('Returns empty data if no valid requests are passed', function () {
+      serverRequest = spec.buildRequests([]);
+      let data = serverRequest.data;
+      expect(data.adUnits).to.be.an('array').that.is.empty;
+    });
+  });
+  describe('interpretBannerResponse', function () {
+    let resObject = {
+      body: [ {
+        requestId: '123',
+        mediaType: 'banner',
+        cpm: 0.3,
+        width: 320,
+        height: 50,
+        ad: '<h1>Hello ad</h1>',
+        ttl: 1000,
+        creativeId: '123asd',
+        netRevenue: true,
+        currency: 'USD'
+      } ]
+    };
+    let serverResponses = spec.interpretResponse(resObject);
+    it('Returns an array of valid server responses if response object is valid', function () {
+      expect(serverResponses).to.be.an('array').that.is.not.empty;
+      for (let i = 0; i < serverResponses.length; i++) {
+        let dataItem = serverResponses[i];
+        expect(dataItem).to.have.all.keys('requestId', 'cpm', 'width', 'height', 'ad', 'ttl', 'creativeId',
+          'netRevenue', 'currency', 'mediaType');
+        expect(dataItem.requestId).to.be.a('string');
+        expect(dataItem.cpm).to.be.a('number');
+        expect(dataItem.width).to.be.a('number');
+        expect(dataItem.height).to.be.a('number');
+        expect(dataItem.ad).to.be.a('string');
+        expect(dataItem.ttl).to.be.a('number');
+        expect(dataItem.creativeId).to.be.a('string');
+        expect(dataItem.netRevenue).to.be.a('boolean');
+        expect(dataItem.currency).to.be.a('string');
+        expect(dataItem.mediaType).to.be.a('string');
+      }
+      it('Returns an empty array if invalid response is passed', function () {
+        serverResponses = spec.interpretResponse('invalid_response');
+        expect(serverResponses).to.be.an('array').that.is.empty;
+      });
+    });
+  });
+  describe('interpretVideoResponse', function () {
+    let resObject = {
+      body: [ {
+        requestId: '123',
+        mediaType: 'video',
+        cpm: 0.3,
+        width: 320,
+        height: 50,
+        vastXml: '<VAST></VAST>',
+        ttl: 1000,
+        creativeId: '123asd',
+        netRevenue: true,
+        currency: 'USD'
+      } ]
+    };
+    let serverResponses = spec.interpretResponse(resObject);
+    it('Returns an array of valid server responses if response object is valid', function () {
+      expect(serverResponses).to.be.an('array').that.is.not.empty;
+      for (let i = 0; i < serverResponses.length; i++) {
+        let dataItem = serverResponses[i];
+        expect(dataItem).to.have.all.keys('requestId', 'cpm', 'width', 'height', 'vastXml', 'ttl', 'creativeId',
+          'netRevenue', 'currency', 'mediaType');
+        expect(dataItem.requestId).to.be.a('string');
+        expect(dataItem.cpm).to.be.a('number');
+        expect(dataItem.width).to.be.a('number');
+        expect(dataItem.height).to.be.a('number');
+        expect(dataItem.vastXml).to.be.a('string');
+        expect(dataItem.ttl).to.be.a('number');
+        expect(dataItem.creativeId).to.be.a('string');
+        expect(dataItem.netRevenue).to.be.a('boolean');
+        expect(dataItem.currency).to.be.a('string');
+        expect(dataItem.mediaType).to.be.a('string');
+      }
+      it('Returns an empty array if invalid response is passed', function () {
+        serverResponses = spec.interpretResponse('invalid_response');
+        expect(serverResponses).to.be.an('array').that.is.empty;
+      });
+    });
+  });
+  describe('isBidRequestValid', function() {
+    let bid = {
+      bidId: '2dd581a2b6281d',
+      bidder: 'project-limelight',
+      bidderRequestId: '145e1d6a7837c9',
+      params: {
+        adUnitId: 123,
+        adUnitType: 'banner'
+      },
+      placementCode: 'placement_0',
+      auctionId: '74f78609-a92d-4cf1-869f-1b244bbfb5d2',
+      sizes: [[300, 250]],
+      transactionId: '3bb2f6da-87a6-4029-aeb0-bfe951372e62'
+    };
+
+    it('should return true when required params found', function() {
+      expect(spec.isBidRequestValid(bid)).to.equal(true);
+    });
+
+    it('should return false when required params are not passed', function() {
+      let bidFailed = {
+        bidder: 'project-limelight',
+        bidderRequestId: '145e1d6a7837c9',
+        params: {
+          adUnitId: 123,
+          adUnitType: 'banner'
+        },
+        placementCode: 'placement_0',
+        auctionId: '74f78609-a92d-4cf1-869f-1b244bbfb5d2',
+        sizes: [[300, 250]],
+        transactionId: '3bb2f6da-87a6-4029-aeb0-bfe951372e62'
+      };
+      expect(spec.isBidRequestValid(bidFailed)).to.equal(false);
+    });
+  });
+});