diff --git a/modules/ajaBidAdapter.js b/modules/ajaBidAdapter.js
index fcbe0c12c6e..e02ab920707 100644
--- a/modules/ajaBidAdapter.js
+++ b/modules/ajaBidAdapter.js
@@ -71,10 +71,8 @@ export const spec = {
       queryString = tryAppendQueryString(queryString, 'cdep', bidRequest.ortb2?.device?.ext?.cdep)
       queryString = tryAppendQueryString(queryString, 'prebid_id', bidRequest.bidId);
       queryString = tryAppendQueryString(queryString, 'prebid_ver', '$prebid.version$');
-
-      if (pageUrl) {
-        queryString = tryAppendQueryString(queryString, 'page_url', pageUrl);
-      }
+      queryString = tryAppendQueryString(queryString, 'page_url', pageUrl);
+      queryString = tryAppendQueryString(queryString, 'schain', spec.serializeSupplyChain(bidRequest.schain || []))
 
       const adFormatIDs = pickAdFormats(bidRequest)
       if (adFormatIDs && adFormatIDs.length > 0) {
@@ -172,6 +170,31 @@ export const spec = {
 
     return syncs;
   },
+
+  /**
+   * Serialize supply chain object
+   * @param {Object} supplyChain
+   * @returns {String | undefined}
+   */
+  serializeSupplyChain: function(supplyChain) {
+    if (!supplyChain || !supplyChain.nodes) return undefined
+    const { ver, complete, nodes } = supplyChain
+    return `${ver},${complete}!${spec.serializeSupplyChainNodes(nodes)}`
+  },
+
+  /**
+   * Serialize each supply chain nodes
+   * @param {Array} nodes
+   * @returns {String}
+   */
+  serializeSupplyChainNodes: function(nodes) {
+    const fields = ['asi', 'sid', 'hp', 'rid', 'name', 'domain']
+    return nodes.map((n) => {
+      return fields.map((f) => {
+        return encodeURIComponent(n[f] || '').replace(/!/g, '%21')
+      }).join(',')
+    }).join('!')
+  }
 }
 
 function pickAdFormats(bidRequest) {
diff --git a/test/spec/modules/ajaBidAdapter_spec.js b/test/spec/modules/ajaBidAdapter_spec.js
index 3137c9dc24e..dbc72d113f4 100644
--- a/test/spec/modules/ajaBidAdapter_spec.js
+++ b/test/spec/modules/ajaBidAdapter_spec.js
@@ -73,9 +73,32 @@ describe('AjaAdapter', function () {
             tid: 'cea1eb09-d970-48dc-8585-634d3a7b0544',
             gpid: '/1111/homepage#300x250'
           }
-        }
+        },
+        schain: {
+          ver: '1.0',
+          complete: 1,
+          nodes: [
+            {
+              asi: 'exchange1.com',
+              sid: '1234',
+              hp: 1,
+              rid: 'bid-request-1',
+              name: 'publisher',
+              domain: 'publisher.com'
+            },
+            {
+              asi: 'exchange2.com',
+              sid: 'abcd',
+              hp: 1,
+              rid: 'bid-request-2',
+              name: 'intermediary',
+              domain: 'intermediary.com'
+            }
+          ]
+        },
       }
     ];
+    const serializedSchain = encodeURIComponent('1.0,1!exchange1.com,1234,1,bid-request-1,publisher,publisher.com!exchange2.com,abcd,1,bid-request-2,intermediary,intermediary.com')
 
     const bidderRequest = {
       refererInfo: {
@@ -87,7 +110,7 @@ describe('AjaAdapter', function () {
       const requests = spec.buildRequests(bidRequests, bidderRequest);
       expect(requests[0].url).to.equal(ENDPOINT);
       expect(requests[0].method).to.equal('GET');
-      expect(requests[0].data).to.equal('asi=123456&skt=5&gpid=%2F1111%2Fhomepage%23300x250&tid=cea1eb09-d970-48dc-8585-634d3a7b0544&cdep=example_label_1&prebid_id=30b31c1838de1e&prebid_ver=$prebid.version$&page_url=https%3A%2F%2Fhoge.com&ad_format_ids=2&sua=%7B%22source%22%3A2%2C%22platform%22%3A%7B%22brand%22%3A%22Android%22%2C%22version%22%3A%5B%228%22%2C%220%22%2C%220%22%5D%7D%2C%22browsers%22%3A%5B%7B%22brand%22%3A%22Not_A%20Brand%22%2C%22version%22%3A%5B%2299%22%2C%220%22%2C%220%22%2C%220%22%5D%7D%2C%7B%22brand%22%3A%22Google%20Chrome%22%2C%22version%22%3A%5B%22109%22%2C%220%22%2C%225414%22%2C%22119%22%5D%7D%2C%7B%22brand%22%3A%22Chromium%22%2C%22version%22%3A%5B%22109%22%2C%220%22%2C%225414%22%2C%22119%22%5D%7D%5D%2C%22mobile%22%3A1%2C%22model%22%3A%22SM-G955U%22%2C%22bitness%22%3A%2264%22%2C%22architecture%22%3A%22%22%7D&');
+      expect(requests[0].data).to.equal(`asi=123456&skt=5&gpid=%2F1111%2Fhomepage%23300x250&tid=cea1eb09-d970-48dc-8585-634d3a7b0544&cdep=example_label_1&prebid_id=30b31c1838de1e&prebid_ver=$prebid.version$&page_url=https%3A%2F%2Fhoge.com&schain=${serializedSchain}&ad_format_ids=2&sua=%7B%22source%22%3A2%2C%22platform%22%3A%7B%22brand%22%3A%22Android%22%2C%22version%22%3A%5B%228%22%2C%220%22%2C%220%22%5D%7D%2C%22browsers%22%3A%5B%7B%22brand%22%3A%22Not_A%20Brand%22%2C%22version%22%3A%5B%2299%22%2C%220%22%2C%220%22%2C%220%22%5D%7D%2C%7B%22brand%22%3A%22Google%20Chrome%22%2C%22version%22%3A%5B%22109%22%2C%220%22%2C%225414%22%2C%22119%22%5D%7D%2C%7B%22brand%22%3A%22Chromium%22%2C%22version%22%3A%5B%22109%22%2C%220%22%2C%225414%22%2C%22119%22%5D%7D%5D%2C%22mobile%22%3A1%2C%22model%22%3A%22SM-G955U%22%2C%22bitness%22%3A%2264%22%2C%22architecture%22%3A%22%22%7D&`);
     });
   });