diff --git a/modules/yaleoBidAdapter.md b/modules/yaleoBidAdapter.md
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+# Yaleo Bid Adapter
+
+# Overview
+
+```
+Module name: Yaleo Bid Adapter
+Module Type: Bidder Adapter
+Maintainer: alexandr.kim@audienzz.com
+```
+
+# Description
+
+Module that connects to Yaleo's demand sources.
+
+**Note:** the bid adapter requires correct setup and approval. For more information visit [yaleo.com](https://www.yaleo.com) or contact [hola@yaleo.com](mailto:hola@yaleo.com).
+
+# Test parameters
+
+**Note:** to receive bids when testing without proper integration with the demand source, enable Prebid.js debug mode. See [how to enable debug mode](https://docs.prebid.org/dev-docs/publisher-api-reference/setConfig.html#debugging) for details.
+
+```js
+const adUnits = [
+  {
+    code: "test-div-1",
+    mediaTypes: {
+      banner: {
+        sizes: [[300, 300], [300, 600]],
+      }
+    },
+    bids: [{
+      bidder: "yaleo",
+      params: {
+        placementId: "95a09f24-afb8-441c-977b-08b4039cb88e",
+      }
+    }]
+  }
+];
+```
+
diff --git a/modules/yaleoBidAdapter.ts b/modules/yaleoBidAdapter.ts
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+++ b/modules/yaleoBidAdapter.ts
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+import { ortbConverter } from '../libraries/ortbConverter/converter.js';
+import { pbsExtensions } from '../libraries/pbsExtensions/pbsExtensions.js';
+import { BidderSpec, registerBidder } from '../src/adapters/bidderFactory.js';
+import { BANNER } from '../src/mediaTypes.js';
+
+interface YaleoBidParams {
+  /**
+   * Yaleo placement ID.
+   */
+  placementId: string;
+  /**
+   * Member ID.
+   * @default 3927
+   */
+  memberId?: number;
+  /**
+   * Maximum CPM value. Bids with a CPM higher than the specified value will be rejected.
+   */
+  maxCpm?: number;
+}
+
+declare module '../src/adUnits' {
+  interface BidderParams {
+    [BIDDER_CODE]: YaleoBidParams;
+  }
+}
+
+const BIDDER_CODE = 'yaleo';
+const AUDIENZZ_VENDOR_ID = 783;
+const PREBID_URL = 'https://bidder.yaleo.com/prebid';
+const DEFAULT_TTL = 300;
+
+const converter = ortbConverter<typeof BIDDER_CODE>({
+  context: {
+    netRevenue: true,
+    ttl: DEFAULT_TTL,
+  },
+  processors: pbsExtensions,
+});
+
+const isBidRequestValid: BidderSpec<typeof BIDDER_CODE>['isBidRequestValid'] = (request) => {
+  if (!request.params || typeof request.params.placementId !== 'string') {
+    return false;
+  }
+
+  return !!request.params.placementId;
+};
+
+const buildRequests: BidderSpec<typeof BIDDER_CODE>['buildRequests'] = (validBidRequests, bidderRequest) => {
+  const ortbRequest = converter.toORTB({
+    bidRequests: validBidRequests,
+    bidderRequest,
+  });
+
+  return {
+    url: PREBID_URL,
+    method: 'POST',
+    data: ortbRequest,
+  };
+}
+
+const interpretResponse: BidderSpec<typeof BIDDER_CODE>['interpretResponse'] = (serverResponse, bidderRequest) => {
+  const response = converter.fromORTB({
+    response: serverResponse.body,
+    request: bidderRequest.data,
+  });
+
+  return response;
+};
+
+export const spec: BidderSpec<typeof BIDDER_CODE> = {
+  buildRequests,
+  code: BIDDER_CODE,
+  gvlid: AUDIENZZ_VENDOR_ID,
+  interpretResponse,
+  isBidRequestValid,
+  supportedMediaTypes: [BANNER],
+};
+
+registerBidder(spec);
diff --git a/test/spec/modules/yaleoBidAdapter_spec.js b/test/spec/modules/yaleoBidAdapter_spec.js
new file mode 100644
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+++ b/test/spec/modules/yaleoBidAdapter_spec.js
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+import { cloneDeep } from "lodash";
+import { spec } from "../../../modules/yaleoBidAdapter.ts";
+
+const bannerBidRequestBase = {
+  adUnitCode: 'banner-ad-unit-code',
+  auctionId: 'banner-auction-id',
+  bidId: 'banner-bid-id',
+  bidder: 'yaleo',
+  bidderRequestId: 'banner-bidder-request-id',
+  mediaTypes: { banner: [[300, 250]] },
+  params: { placementId: '12345' },
+};
+
+const bannerServerResponseBase = {
+  body: {
+    id: 'banner-server-response-id',
+    seatbid: [
+      {
+        bid: [
+          {
+            id: 'banner-seatbid-bid-id',
+            impid: 'banner-bid-id',
+            price: 0.05,
+            adm: '<div>banner-ad</div>',
+            adid: 'banner-ad-id',
+            adomain: ['audienzz.com', 'yaleo.com'],
+            iurl: 'iurl',
+            cid: 'banner-campaign-id',
+            crid: 'banner-creative-id',
+            cat: [],
+            w: 300,
+            h: 250,
+            mtype: 1,
+          },
+        ],
+        seat: 'yaleo',
+      },
+    ],
+    cur: 'USD',
+  },
+};
+
+describe('Yaleo bid adapter', () => {
+  let bannerBidRequest;
+
+  beforeEach(() => {
+    bannerBidRequest = cloneDeep(bannerBidRequestBase);
+  });
+
+  describe('spec', () => {
+    it('checks that spec has required properties', () => {
+      expect(spec).to.have.property('code', 'yaleo');
+      expect(spec).to.have.property('supportedMediaTypes').that.includes('banner');
+      expect(spec).to.have.property('isBidRequestValid').that.is.a('function');
+      expect(spec).to.have.property('buildRequests').that.is.a('function');
+      expect(spec).to.have.property('interpretResponse').that.is.a('function');
+      expect(spec).to.have.property('gvlid').that.equals(783);
+    });
+  });
+
+  describe('isBidRequestValid', () => {
+    it('returns true when all params are specified', () => {
+      bannerBidRequest.params = {
+        placementId: '12345',
+        maxCpm: 5.00,
+        memberId: 12345,
+      };
+      expect(spec.isBidRequestValid(bannerBidRequest)).to.be.true;
+    });
+
+    it('returns true when required params are specified', () => {
+      bannerBidRequest.params = { placementId: '12345' };
+      expect(spec.isBidRequestValid(bannerBidRequest)).to.be.true;
+    });
+
+    it('returns false when params are empty', () => {
+      bannerBidRequest.params = {};
+      expect(spec.isBidRequestValid(bannerBidRequest)).to.be.false;
+    });
+
+    it('returns false when params are not specified', () => {
+      bannerBidRequest.params = undefined;
+      expect(spec.isBidRequestValid(bannerBidRequest)).to.be.false;
+    });
+
+    it('returnsfalse when required params are not specified', () => {
+      bannerBidRequest.params = { wrongParam: '12345' };
+      expect(spec.isBidRequestValid(bannerBidRequest)).to.be.false;
+    });
+
+    it('returns false when placementId is a number', () => {
+      bannerBidRequest.params = { placementId: 12345 };
+      expect(spec.isBidRequestValid(bannerBidRequest)).to.be.false;
+    });
+
+    it('returns false when placementId is a boolean', () => {
+      bannerBidRequest.params = { placementId: true };
+      expect(spec.isBidRequestValid(bannerBidRequest)).to.be.false;
+    });
+
+    it('returns false when placementId is an object', () => {
+      bannerBidRequest.params = { placementId: {} };
+      expect(spec.isBidRequestValid(bannerBidRequest)).to.be.false;
+    });
+
+    it('returns false when placementId is an array', () => {
+      bannerBidRequest.params = { placementId: [] };
+      expect(spec.isBidRequestValid(bannerBidRequest)).to.be.false;
+    });
+
+    it('returns false when placementId is undefined', () => {
+      bannerBidRequest.params = { placementId: undefined };
+      expect(spec.isBidRequestValid(bannerBidRequest)).to.be.false;
+    });
+
+    it('returns false when placementId is null', () => {
+      bannerBidRequest.params = { placementId: null };
+      expect(spec.isBidRequestValid(bannerBidRequest)).to.be.false;
+    });
+  });
+
+  describe('buildRequests', () => {
+    it('creates a valid banner bid request', () => {
+      const bidderRequest = {
+        bids: [bannerBidRequest],
+        auctionId: bannerBidRequest.auctionId,
+        bidderRequestId: bannerBidRequest.bidderRequestId,
+        ortb2: {
+          site: {
+            page: 'http://example.com',
+          }
+        }
+      };
+
+      const request = spec.buildRequests([bannerBidRequest], bidderRequest);
+
+      expect(request.method).to.equal('POST');
+      expect(request.url).to.equal('https://bidder.yaleo.com/prebid');
+      expect(request.data.imp.length).to.equal(1);
+      expect(request.data.imp[0]).to.have.property('banner');
+      expect(request.data.site.page).to.be.equal('http://example.com');
+    });
+
+    it('checks that all params are passed to the request', () => {
+      bannerBidRequest.params = {
+        placementId: '12345',
+        maxCpm: 5.00,
+        memberId: 12345,
+      };
+      const bidderRequest = {
+        bids: [bannerBidRequest],
+        auctionId: bannerBidRequest.auctionId,
+        bidderRequestId: bannerBidRequest.bidderRequestId,
+      };
+
+      const request = spec.buildRequests([bannerBidRequest], bidderRequest);
+      const yaleoParams = request.data.imp[0].ext.prebid.bidder.yaleo;
+
+      expect(yaleoParams.placementId).to.equal('12345');
+      expect(yaleoParams.maxCpm).to.equal(5.00);
+      expect(yaleoParams.memberId).to.equal(12345);
+    });
+  });
+
+  it('checks that only specified params are passed to the request', () => {
+    bannerBidRequest.params = {
+      placementId: '12345',
+    };
+
+    const bidderRequest = {
+      bids: [bannerBidRequest],
+      auctionId: bannerBidRequest.auctionId,
+      bidderRequestId: bannerBidRequest.bidderRequestId,
+    };
+
+    const request = spec.buildRequests([bannerBidRequest], bidderRequest);
+    const yaleoParams = request.data.imp[0].ext.prebid.bidder.yaleo;
+
+    expect(yaleoParams).to.deep.equal({ placementId: '12345' });
+  });
+
+  describe('interpretResponse', () => {
+    let bannerServerResponse;
+    beforeEach(() => {
+      bannerServerResponse = cloneDeep(bannerServerResponseBase);
+    });
+
+    it('parses banner bid response correctly', () => {
+      const bidderRequest = {
+        bids: [bannerBidRequest],
+        auctionId: bannerBidRequest.auctionId,
+        bidderRequestId: bannerBidRequest.bidderRequestId,
+      };
+
+      const request = spec.buildRequests([bannerBidRequest], bidderRequest);
+      const response = spec.interpretResponse(bannerServerResponse, request);
+
+      expect(response).to.have.property('bids');
+      expect(response.bids.length).to.be.equal(1);
+      expect(response.bids[0].cpm).to.equal(0.05);
+      expect(response.bids[0].currency).to.equal('USD');
+      expect(response.bids[0].mediaType).to.equal('banner');
+      expect(response.bids[0].width).to.equal(300);
+      expect(response.bids[0].height).to.equal(250);
+      expect(response.bids[0].creativeId).to.equal('banner-creative-id');
+      expect(response.bids[0].ad).to.equal('<div>banner-ad</div>');
+      expect(response.bids[0].bidderCode).to.equal('yaleo');
+      expect(response.bids[0].meta.advertiserDomains).to.deep.equal(['audienzz.com', 'yaleo.com']);
+      expect(response.bids[0].netRevenue).to.be.true;
+      expect(response.bids[0].ttl).to.equal(300);
+    });
+  });
+});