diff --git a/endpoints/openrtb2/sample-requests/invalid-native/context-type-content-incompatible-subtype.json b/endpoints/openrtb2/sample-requests/invalid-native/context-type-content-incompatible-subtype.json
new file mode 100644
index 00000000000..4297aa7596b
--- /dev/null
+++ b/endpoints/openrtb2/sample-requests/invalid-native/context-type-content-incompatible-subtype.json
@@ -0,0 +1,25 @@
+{
+  "description": "Native bid request. Context type content (1) is incompatible with 'social' subcontext types (20~29). Return error",
+  "mockBidRequest": {
+    "id": "req-id",
+    "site": {
+      "page": "some.page.com"
+    },
+    "tmax": 500,
+    "imp": [
+      {
+        "id": "some-imp",
+        "native": {
+          "request": "{\"context\":1,\"contextsubtype\":21,\"plcmttype\":1,\"assets\":[{\"title\":{\"len\":90}},{\"img\":{\"hmin\":30,\"wmin\":20}},{\"video\":{\"mimes\":[\"video/mp4\"],\"minduration\":5,\"maxduration\":10,\"protocols\":[1]}},{\"data\":{\"type\":2}}]}"
+        },
+        "ext": {
+          "appnexus": {
+            "placementId": 12883451
+          }
+        }
+      }
+    ]
+  },
+  "expectedReturnCode": 400,
+  "expectedErrorMessage": "Invalid request"
+}
diff --git a/endpoints/openrtb2/sample-requests/invalid-native/context-type-product-incompatible-subtype.json b/endpoints/openrtb2/sample-requests/invalid-native/context-type-product-incompatible-subtype.json
new file mode 100644
index 00000000000..3193833658b
--- /dev/null
+++ b/endpoints/openrtb2/sample-requests/invalid-native/context-type-product-incompatible-subtype.json
@@ -0,0 +1,27 @@
+{
+  "description": "Native bid request. Context type product (3) is incompatible with 'social' subcontext types (10~19). Return error",
+  "mockBidRequest": {
+    "id": "req-id",
+    "site": {
+      "page": "some.page.com"
+    },
+    "tmax": 500,
+    "imp": [
+      {
+        "id": "some-imp",
+        "native": {
+          "request": "{\"context\":3,\"contextsubtype\":11,\"plcmttype\":1,\"assets\":[{\"title\":{\"len\":90}},{\"img\":{\"hmin\":30,\"wmin\":20}},{\"video\":{\"mimes\":[\"video/mp4\"],\"minduration\":5,\"maxduration\":10,\"protocols\":[1]}},{\"data\":{\"type\":2}}]}"
+        },
+        "ext": {
+          "appnexus": {
+            "placementId": 12883451
+          }
+        }
+      }
+    ]
+  },
+  "expectedReturnCode": 400,
+  "expectedErrorMessage": "Invalid request"
+}
+
+
diff --git a/endpoints/openrtb2/sample-requests/invalid-native/context-type-social-incompatible-subtype.json b/endpoints/openrtb2/sample-requests/invalid-native/context-type-social-incompatible-subtype.json
new file mode 100644
index 00000000000..4ecbf4498fb
--- /dev/null
+++ b/endpoints/openrtb2/sample-requests/invalid-native/context-type-social-incompatible-subtype.json
@@ -0,0 +1,27 @@
+{
+  "description": "Native bid request. Context type social (2) is incompatible with 'product' subcontext types (30~39). Return error",
+  "mockBidRequest": {
+    "id": "req-id",
+    "site": {
+      "page": "some.page.com"
+    },
+    "tmax": 500,
+    "imp": [
+      {
+        "id": "some-imp",
+        "native": {
+          "request": "{\"context\":2,\"contextsubtype\":31,\"plcmttype\":1,\"assets\":[{\"title\":{\"len\":90}},{\"img\":{\"hmin\":30,\"wmin\":20}},{\"video\":{\"mimes\":[\"video/mp4\"],\"minduration\":5,\"maxduration\":10,\"protocols\":[1]}},{\"data\":{\"type\":2}}]}"
+        },
+        "ext": {
+          "appnexus": {
+            "placementId": 12883451
+          }
+        }
+      }
+    ]
+  },
+  "expectedReturnCode": 400,
+  "expectedErrorMessage": "Invalid request"
+}
+
+
diff --git a/endpoints/openrtb2/sample-requests/invalid-native/contextsubtype-greater-than-max.json b/endpoints/openrtb2/sample-requests/invalid-native/contextsubtype-greater-than-max.json
new file mode 100644
index 00000000000..9b422380edf
--- /dev/null
+++ b/endpoints/openrtb2/sample-requests/invalid-native/contextsubtype-greater-than-max.json
@@ -0,0 +1,26 @@
+{
+  "description": "Native bid request comes with a subcontext type greater than 500. Return error",
+  "mockBidRequest": {
+    "id": "req-id",
+    "site": {
+      "page": "some.page.com"
+    },
+    "tmax": 500,
+    "imp": [
+      {
+        "id": "some-imp",
+        "native": {
+          "request": "{\"context\":1,\"contextsubtype\":550,\"plcmttype\":1,\"assets\":[{\"title\":{\"len\":90}},{\"img\":{\"hmin\":30,\"wmin\":20}},{\"video\":{\"mimes\":[\"video/mp4\"],\"minduration\":5,\"maxduration\":10,\"protocols\":[1]}},{\"data\":{\"type\":2}}]}"
+        },
+        "ext": {
+          "appnexus": {
+            "placementId": 12883451
+          }
+        }
+      }
+    ]
+  },
+  "expectedReturnCode": 400,
+  "expectedErrorMessage": "Invalid request"
+}
+
diff --git a/endpoints/openrtb2/sample-requests/invalid-native/contextsubtype-invalid.json b/endpoints/openrtb2/sample-requests/invalid-native/contextsubtype-invalid.json
index 395e7034b0c..cdf4ef0c075 100644
--- a/endpoints/openrtb2/sample-requests/invalid-native/contextsubtype-invalid.json
+++ b/endpoints/openrtb2/sample-requests/invalid-native/contextsubtype-invalid.json
@@ -1,5 +1,5 @@
 {
-  "description": "Bid request with invalid contextsubtype value inside the native.request field in its only imp element",
+  "description": "Native bid request comes with a contextsubtype greater than 32, 'ContextSubTypeProductReview'",
   "mockBidRequest": {
     "id": "req-id",
     "site": {
@@ -10,7 +10,7 @@
       {
         "id": "some-imp",
         "native": {
-          "request": "{\"context\":1,\"contextsubtype\":21,\"plcmttype\":1,\"assets\":[{\"title\":{\"len\":90}},{\"img\":{\"hmin\":30,\"wmin\":20}},{\"video\":{\"mimes\":[\"video/mp4\"],\"minduration\":5,\"maxduration\":10,\"protocols\":[1]}},{\"data\":{\"type\":2}}]}"
+          "request": "{\"context\":1,\"contextsubtype\":41,\"plcmttype\":1,\"assets\":[{\"title\":{\"len\":90}},{\"img\":{\"hmin\":30,\"wmin\":20}},{\"video\":{\"mimes\":[\"video/mp4\"],\"minduration\":5,\"maxduration\":10,\"protocols\":[1]}},{\"data\":{\"type\":2}}]}"
         },
         "ext": {
           "appnexus": {
diff --git a/endpoints/openrtb2/sample-requests/valid-native/context-product-compatible-subtype.json b/endpoints/openrtb2/sample-requests/valid-native/context-product-compatible-subtype.json
new file mode 100644
index 00000000000..dbf7b9c5e0d
--- /dev/null
+++ b/endpoints/openrtb2/sample-requests/valid-native/context-product-compatible-subtype.json
@@ -0,0 +1,41 @@
+{
+  "description": "Native bid request comes with a context type product (3) and compatible subcontext type",
+  "mockBidRequest": {
+    "id": "req-id",
+    "site": {
+      "page": "some.page.com"
+    },
+    "tmax": 500,
+    "imp": [
+      {
+        "id": "some-imp",
+        "native": {
+          "request": "{\"context\":3,\"contextsubtype\":31,\"plcmttype\":1,\"assets\":[{\"title\":{\"len\":90}},{\"img\":{\"hmin\":30,\"wmin\":20}},{\"video\":{\"mimes\":[\"video/mp4\"],\"minduration\":5,\"maxduration\":10,\"protocols\":[1]}},{\"data\":{\"type\":2}}]}"
+        },
+        "ext": {
+          "appnexus": {
+            "placementId": 12883451
+          }
+        }
+      }
+    ]
+  },
+  "expectedBidResponse": {
+    "id": "req-id",
+    "bidid": "test bid id",
+    "nbr": 0,
+      "seatbid": [
+        {
+          "bid": [
+            {
+              "id": "appnexus-bid",
+              "impid": "",
+              "price": 0
+            }
+          ],
+          "seat": "appnexus-bids"
+        }
+      ]
+  },
+  "expectedReturnCode": 200
+}
diff --git a/endpoints/openrtb2/sample-requests/valid-native/context-social-compatible-subtype.json b/endpoints/openrtb2/sample-requests/valid-native/context-social-compatible-subtype.json
new file mode 100644
index 00000000000..41fb833d770
--- /dev/null
+++ b/endpoints/openrtb2/sample-requests/valid-native/context-social-compatible-subtype.json
@@ -0,0 +1,41 @@
+{
+  "description": "Native bid request comes with a context type social (2) and compatible subcontext type",
+  "mockBidRequest": {
+    "id": "req-id",
+    "site": {
+      "page": "some.page.com"
+    },
+    "tmax": 500,
+    "imp": [
+      {
+        "id": "some-imp",
+        "native": {
+          "request": "{\"context\":2,\"contextsubtype\":21,\"plcmttype\":1,\"assets\":[{\"title\":{\"len\":90}},{\"img\":{\"hmin\":30,\"wmin\":20}},{\"video\":{\"mimes\":[\"video/mp4\"],\"minduration\":5,\"maxduration\":10,\"protocols\":[1]}},{\"data\":{\"type\":2}}]}"
+        },
+        "ext": {
+          "appnexus": {
+            "placementId": 12883451
+          }
+        }
+      }
+    ]
+  },
+  "expectedBidResponse": {
+    "id": "req-id",
+    "bidid": "test bid id",
+    "nbr": 0,
+      "seatbid": [
+        {
+          "bid": [
+            {
+              "id": "appnexus-bid",
+              "impid": "",
+              "price": 0
+            }
+          ],
+          "seat": "appnexus-bids"
+        }
+      ]
+  },
+  "expectedReturnCode": 200
+}