diff --git a/adapters/kubient/kubient.go b/adapters/kubient/kubient.go
index cb1fe93ff82..acfaa44b6af 100644
--- a/adapters/kubient/kubient.go
+++ b/adapters/kubient/kubient.go
@@ -24,10 +24,24 @@ type KubientAdapter struct {
 func (adapter *KubientAdapter) MakeRequests(
 	openRTBRequest *openrtb.BidRequest,
 	reqInfo *adapters.ExtraRequestInfo,
-) (
-	requestsToBidder []*adapters.RequestData,
-	errs []error,
-) {
+) ([]*adapters.RequestData, []error) {
+	if len(openRTBRequest.Imp) == 0 {
+		return nil, []error{&errortypes.BadInput{
+			Message: "No impression in the bid request",
+		}}
+	}
+	errs := make([]error, 0, len(openRTBRequest.Imp))
+	hasErrors := false
+	for _, impObj := range openRTBRequest.Imp {
+		err := checkImpExt(impObj)
+		if err != nil {
+			errs = append(errs, err)
+			hasErrors = true
+		}
+	}
+	if hasErrors {
+		return nil, errs
+	}
 	openRTBRequestJSON, err := json.Marshal(openRTBRequest)
 	if err != nil {
 		errs = append(errs, err)
@@ -36,17 +50,36 @@ func (adapter *KubientAdapter) MakeRequests(
 
 	headers := http.Header{}
 	headers.Add("Content-Type", "application/json;charset=utf-8")
-	requestToBidder := &adapters.RequestData{
+	requestsToBidder := []*adapters.RequestData{{
 		Method:  "POST",
 		Uri:     adapter.endpoint,
 		Body:    openRTBRequestJSON,
 		Headers: headers,
-	}
-	requestsToBidder = append(requestsToBidder, requestToBidder)
-
+	}}
 	return requestsToBidder, errs
 }
 
+func checkImpExt(impObj openrtb.Imp) error {
+	var bidderExt adapters.ExtImpBidder
+	if err := json.Unmarshal(impObj.Ext, &bidderExt); err != nil {
+		return &errortypes.BadInput{
+			Message: "ext.bidder not provided",
+		}
+	}
+	var kubientExt openrtb_ext.ExtImpKubient
+	if err := json.Unmarshal(bidderExt.Bidder, &kubientExt); err != nil {
+		return &errortypes.BadInput{
+			Message: "ext.bidder.zoneid is not provided",
+		}
+	}
+	if kubientExt.ZoneID == "" {
+		return &errortypes.BadInput{
+			Message: "zoneid is empty",
+		}
+	}
+	return nil
+}
+
 // MakeBids makes the bids
 func (adapter *KubientAdapter) MakeBids(internalRequest *openrtb.BidRequest, externalRequest *adapters.RequestData, response *adapters.ResponseData) (*adapters.BidderResponse, []error) {
 	var errs []error
diff --git a/adapters/kubient/kubienttest/exemplary/banner.json b/adapters/kubient/kubienttest/exemplary/banner.json
index a32c761a7d0..9af4f9f8cfa 100644
--- a/adapters/kubient/kubienttest/exemplary/banner.json
+++ b/adapters/kubient/kubienttest/exemplary/banner.json
@@ -17,7 +17,9 @@
           ]
         },
         "ext": {
-          "bidder": {}
+          "bidder": {
+            "zoneid": "9042"
+          }
         }
       }
     ]
@@ -44,7 +46,9 @@
                 ]
               },
               "ext": {
-                "bidder": {}
+                "bidder": {
+                  "zoneid": "9042"
+                }
               }
             }
           ]
diff --git a/adapters/kubient/kubienttest/exemplary/video.json b/adapters/kubient/kubienttest/exemplary/video.json
index 59d32874cec..d9346c3fa46 100644
--- a/adapters/kubient/kubienttest/exemplary/video.json
+++ b/adapters/kubient/kubienttest/exemplary/video.json
@@ -11,7 +11,9 @@
           "h": 576
         },
         "ext": {
-          "bidder": {}
+          "bidder": {
+            "zoneid": "9010"
+          }
         }
       }
     ]
@@ -32,7 +34,9 @@
                 "h": 576
               },
               "ext": {
-                "bidder": {}
+                "bidder": {
+                  "zoneid": "9010"
+                }
               }
             }
           ]
diff --git a/adapters/kubient/kubienttest/supplemental/bad_response.json b/adapters/kubient/kubienttest/supplemental/bad_response.json
index 166743cf497..076acf29058 100644
--- a/adapters/kubient/kubienttest/supplemental/bad_response.json
+++ b/adapters/kubient/kubienttest/supplemental/bad_response.json
@@ -13,7 +13,9 @@
           ]
         },
         "ext": {
-          "bidder": {}
+          "bidder": {
+            "zoneid": "23"
+          }
         }
       }
     ]
@@ -36,7 +38,9 @@
                 ]
               },
               "ext": {
-                "bidder": {}
+                "bidder": {
+                  "zoneid": "23"
+                }
               }
             }
           ]
diff --git a/adapters/kubient/kubienttest/supplemental/missing-zoneid.json b/adapters/kubient/kubienttest/supplemental/missing-zoneid.json
new file mode 100644
index 00000000000..cfd616621e2
--- /dev/null
+++ b/adapters/kubient/kubienttest/supplemental/missing-zoneid.json
@@ -0,0 +1,31 @@
+{
+  "mockBidRequest": {
+    "id": "test-request-id",
+    "imp": [
+      {
+        "id": "test-missing-req-param-id",
+        "banner": {
+          "format": [
+            {
+              "w": 300,
+              "h": 250
+            },
+            {
+              "w": 300,
+              "h": 600
+            }
+          ]
+        },
+        "ext": {
+          "bidder": {}
+        }
+      }
+    ]
+  },
+  "expectedMakeRequestsErrors": [
+    {
+      "value": "zoneid is empty",
+      "comparison": "literal"
+    }
+  ]
+}
diff --git a/adapters/kubient/kubienttest/supplemental/no-imps.json b/adapters/kubient/kubienttest/supplemental/no-imps.json
new file mode 100644
index 00000000000..189adf9a932
--- /dev/null
+++ b/adapters/kubient/kubienttest/supplemental/no-imps.json
@@ -0,0 +1,12 @@
+{
+  "mockBidRequest": {
+    "id": "test-no-imp-request-id",
+    "imp": []
+  },
+  "expectedMakeRequestsErrors": [
+    {
+      "value": "No impression in the bid request",
+      "comparison": "literal"
+    }
+  ]
+}
\ No newline at end of file
diff --git a/adapters/kubient/kubienttest/supplemental/status_204.json b/adapters/kubient/kubienttest/supplemental/status_204.json
index 58bb2629a5e..6794d58be6c 100644
--- a/adapters/kubient/kubienttest/supplemental/status_204.json
+++ b/adapters/kubient/kubienttest/supplemental/status_204.json
@@ -14,6 +14,7 @@
         },
         "ext": {
           "bidder": {
+            "zoneid": "203"
           }
         }
       }
@@ -39,6 +40,7 @@
               },
               "ext": {
                 "bidder": {
+                  "zoneid": "203"
                 }
               }
             }
diff --git a/adapters/kubient/kubienttest/supplemental/status_400.json b/adapters/kubient/kubienttest/supplemental/status_400.json
index e895f793dc1..29438cc3b8b 100644
--- a/adapters/kubient/kubienttest/supplemental/status_400.json
+++ b/adapters/kubient/kubienttest/supplemental/status_400.json
@@ -13,7 +13,9 @@
           ]
         },
         "ext": {
-          "bidder": {}
+          "bidder": {
+            "zoneid": "102"
+          }
         }
       }
     ]
@@ -37,7 +39,9 @@
                 ]
               },
               "ext": {
-                "bidder": {}
+                "bidder": {
+                  "zoneid": "102"
+                }
               }
             }
           ]
diff --git a/openrtb_ext/imp_kubient.go b/openrtb_ext/imp_kubient.go
new file mode 100644
index 00000000000..fafd2a0eb8f
--- /dev/null
+++ b/openrtb_ext/imp_kubient.go
@@ -0,0 +1,6 @@
+package openrtb_ext
+
+// ExtImpKubient defines the contract for bidrequest.imp[i].ext.kubient
+type ExtImpKubient struct {
+	ZoneID string `json:"zoneid"`
+}
diff --git a/static/bidder-params/kubient.json b/static/bidder-params/kubient.json
index a75dd734ff2..9b975289a7b 100644
--- a/static/bidder-params/kubient.json
+++ b/static/bidder-params/kubient.json
@@ -3,5 +3,11 @@
   "title": "Kubient Adapter Params",
   "description": "A schema which validates params accepted by the Kubient adapter",
   "type": "object",
-  "properties": {  }
+  "properties": {
+    "zoneid": {
+      "type": "string",
+      "description": "Zone ID identifies Kubient placement ID.",
+      "minLength": 1
+    }
+  }
 }