diff --git a/modules/quantcastBidAdapter.js b/modules/quantcastBidAdapter.js
index 4ffb84b8934..fbf3396a40b 100644
--- a/modules/quantcastBidAdapter.js
+++ b/modules/quantcastBidAdapter.js
@@ -6,6 +6,10 @@ import { registerBidder } from '../src/adapters/bidderFactory.js';
 const BIDDER_CODE = 'quantcast';
 const DEFAULT_BID_FLOOR = 0.0000000001;
 
+const QUANTCAST_VENDOR_ID = '11';
+// Check other required purposes on server
+const PURPOSE_DATA_COLLECT = '1';
+
 export const QUANTCAST_DOMAIN = 'qcx.quantserve.com';
 export const QUANTCAST_TEST_DOMAIN = 's2s-canary.quantserve.com';
 export const QUANTCAST_NET_REVENUE = true;
@@ -72,6 +76,35 @@ function getDomain(url) {
   return url.replace('http://', '').replace('https://', '').replace('www.', '').split(/[/?#]/)[0];
 }
 
+function checkTCFv1(vendorData) {
+  let vendorConsent = vendorData.vendorConsents && vendorData.vendorConsents[QUANTCAST_VENDOR_ID];
+  let purposeConsent = vendorData.purposeConsents && vendorData.purposeConsents[PURPOSE_DATA_COLLECT];
+
+  return !!(vendorConsent && purposeConsent);
+}
+
+function checkTCFv2(tcData) {
+  if (tcData.purposeOneTreatment && tcData.publisherCC === 'DE') {
+    // special purpose 1 treatment for Germany
+    return true;
+  }
+
+  let restrictions = tcData.publisher ? tcData.publisher.restrictions : {};
+  let qcRestriction = restrictions && restrictions[PURPOSE_DATA_COLLECT]
+    ? restrictions[PURPOSE_DATA_COLLECT][QUANTCAST_VENDOR_ID]
+    : null;
+
+  if (qcRestriction === 0 || qcRestriction === 2) {
+    // Not allowed by publisher, or requires legitimate interest
+    return false;
+  }
+
+  let vendorConsent = tcData.vendor && tcData.vendor.consents && tcData.vendor.consents[QUANTCAST_VENDOR_ID];
+  let purposeConsent = tcData.purpose && tcData.purpose.consents && tcData.purpose.consents[PURPOSE_DATA_COLLECT];
+
+  return !!(vendorConsent && purposeConsent);
+}
+
 /**
  * The documentation for Prebid.js Adapter 1.0 can be found at link below,
  * http://prebid.org/dev-docs/bidder-adapter-1.html
@@ -107,6 +140,21 @@ export const spec = {
     const page = utils.deepAccess(bidderRequest, 'refererInfo.canonicalUrl') || config.getConfig('pageUrl') || utils.deepAccess(window, 'location.href');
     const domain = getDomain(page);
 
+    // Check for GDPR consent for purpose 1, and drop request if consent has not been given
+    // Remaining consent checks are performed server-side.
+    if (gdprConsent.gdprApplies) {
+      if (gdprConsent.vendorData) {
+        if (gdprConsent.apiVersion === 1 && !checkTCFv1(gdprConsent.vendorData)) {
+          utils.logInfo(`${BIDDER_CODE}: No purpose 1 consent for TCF v1`);
+          return;
+        }
+        if (gdprConsent.apiVersion === 2 && !checkTCFv2(gdprConsent.vendorData)) {
+          utils.logInfo(`${BIDDER_CODE}: No purpose 1 consent for TCF v2`);
+          return;
+        }
+      }
+    }
+
     let bidRequestsList = [];
 
     bids.forEach(bid => {
diff --git a/test/spec/modules/quantcastBidAdapter_spec.js b/test/spec/modules/quantcastBidAdapter_spec.js
index 351cea0b086..96e69664859 100644
--- a/test/spec/modules/quantcastBidAdapter_spec.js
+++ b/test/spec/modules/quantcastBidAdapter_spec.js
@@ -348,13 +348,254 @@ describe('Quantcast adapter', function () {
   });
 
   it('propagates GDPR consent string and signal', function () {
-    const bidderRequest = { gdprConsent: { gdprApplies: true, consentString: 'consentString' } }
+    const bidderRequest = {
+      gdprConsent: {
+        gdprApplies: true,
+        consentString: 'consentString'
+      }
+    };
+
+    const requests = qcSpec.buildRequests([bidRequest], bidderRequest);
+    const parsed = JSON.parse(requests[0].data);
+
+    expect(parsed.gdprSignal).to.equal(1);
+    expect(parsed.gdprConsent).to.equal('consentString');
+  });
+
+  it('allows TCF v1 request with consent for purpose 1', function () {
+    const bidderRequest = {
+      gdprConsent: {
+        gdprApplies: true,
+        consentString: 'consentString',
+        vendorData: {
+          vendorConsents: {
+            '11': true
+          },
+          purposeConsents: {
+            '1': true
+          }
+        },
+        apiVersion: 1
+      }
+    };
+
+    const requests = qcSpec.buildRequests([bidRequest], bidderRequest);
+    const parsed = JSON.parse(requests[0].data);
+
+    expect(parsed.gdprSignal).to.equal(1);
+    expect(parsed.gdprConsent).to.equal('consentString');
+  });
+
+  it('blocks TCF v1 request without vendor consent', function () {
+    const bidderRequest = {
+      gdprConsent: {
+        gdprApplies: true,
+        consentString: 'consentString',
+        vendorData: {
+          vendorConsents: {
+            '11': false
+          },
+          purposeConsents: {
+            '1': true
+          }
+        },
+        apiVersion: 1
+      }
+    };
+
+    const requests = qcSpec.buildRequests([bidRequest], bidderRequest);
+
+    expect(requests).to.equal(undefined);
+  });
+
+  it('blocks TCF v1 request without consent for purpose 1', function () {
+    const bidderRequest = {
+      gdprConsent: {
+        gdprApplies: true,
+        consentString: 'consentString',
+        vendorData: {
+          vendorConsents: {
+            '11': true
+          },
+          purposeConsents: {
+            '1': false
+          }
+        },
+        apiVersion: 1
+      }
+    };
+
+    const requests = qcSpec.buildRequests([bidRequest], bidderRequest);
+
+    expect(requests).to.equal(undefined);
+  });
+
+  it('allows TCF v2 request from Germany for purpose 1', function () {
+    const bidderRequest = {
+      gdprConsent: {
+        gdprApplies: true,
+        consentString: 'consentString',
+        vendorData: {
+          publisherCC: 'DE',
+          purposeOneTreatment: true
+        },
+        apiVersion: 2
+      }
+    };
+
     const requests = qcSpec.buildRequests([bidRequest], bidderRequest);
     const parsed = JSON.parse(requests[0].data);
+
     expect(parsed.gdprSignal).to.equal(1);
     expect(parsed.gdprConsent).to.equal('consentString');
   });
 
+  it('allows TCF v2 request when Quantcast has consent for purpose 1', function() {
+    const bidderRequest = {
+      gdprConsent: {
+        gdprApplies: true,
+        consentString: 'consentString',
+        vendorData: {
+          vendor: {
+            consents: {
+              '11': true
+            }
+          },
+          purpose: {
+            consents: {
+              '1': true
+            }
+          }
+        },
+        apiVersion: 2
+      }
+    };
+
+    const requests = qcSpec.buildRequests([bidRequest], bidderRequest);
+    const parsed = JSON.parse(requests[0].data);
+
+    expect(parsed.gdprSignal).to.equal(1);
+    expect(parsed.gdprConsent).to.equal('consentString');
+  });
+
+  it('blocks TCF v2 request when no consent for Quantcast', function() {
+    const bidderRequest = {
+      gdprConsent: {
+        gdprApplies: true,
+        consentString: 'consentString',
+        vendorData: {
+          vendor: {
+            consents: {
+              '11': false
+            }
+          },
+          purpose: {
+            consents: {
+              '1': true
+            }
+          }
+        },
+        apiVersion: 2
+      }
+    };
+
+    const requests = qcSpec.buildRequests([bidRequest], bidderRequest);
+
+    expect(requests).to.equal(undefined);
+  });
+
+  it('blocks TCF v2 request when no consent for purpose 1', function() {
+    const bidderRequest = {
+      gdprConsent: {
+        gdprApplies: true,
+        consentString: 'consentString',
+        vendorData: {
+          vendor: {
+            consents: {
+              '11': true
+            }
+          },
+          purpose: {
+            consents: {
+              '1': false
+            }
+          }
+        },
+        apiVersion: 2
+      }
+    };
+
+    const requests = qcSpec.buildRequests([bidRequest], bidderRequest);
+
+    expect(requests).to.equal(undefined);
+  });
+
+  it('blocks TCF v2 request when Quantcast not allowed by publisher', function () {
+    const bidderRequest = {
+      gdprConsent: {
+        gdprApplies: true,
+        consentString: 'consentString',
+        vendorData: {
+          vendor: {
+            consents: {
+              '11': true
+            }
+          },
+          purpose: {
+            consents: {
+              '1': true
+            }
+          },
+          publisher: {
+            restrictions: {
+              '1': {
+                '11': 0
+              }
+            }
+          }
+        },
+        apiVersion: 2
+      }
+    };
+
+    const requests = qcSpec.buildRequests([bidRequest], bidderRequest);
+
+    expect(requests).to.equal(undefined);
+  });
+
+  it('blocks TCF v2 request when legitimate interest required', function () {
+    const bidderRequest = {
+      gdprConsent: {
+        gdprApplies: true,
+        consentString: 'consentString',
+        vendorData: {
+          vendor: {
+            consents: {
+              '11': true
+            }
+          },
+          purpose: {
+            consents: {
+              '1': true
+            }
+          },
+          publisher: {
+            restrictions: {
+              '1': {
+                '11': 2
+              }
+            }
+          }
+        },
+        apiVersion: 2
+      }
+    };
+
+    const requests = qcSpec.buildRequests([bidRequest], bidderRequest);
+
+    expect(requests).to.equal(undefined);
+  });
+
   it('propagates US Privacy/CCPA consent information', function () {
     const bidderRequest = { uspConsent: 'consentString' }
     const requests = qcSpec.buildRequests([bidRequest], bidderRequest);