diff --git a/openrtb2/audio.go b/openrtb2/audio.go
index d642bac..23f3b58 100644
--- a/openrtb2/audio.go
+++ b/openrtb2/audio.go
@@ -208,7 +208,9 @@ type Audio struct {
 	//   List of supported API frameworks for this impression. Refer to
 	//   List: API Frameworks in AdCOM 1.0. If an API is not explicitly
 	//   listed, it is assumed not to be supported.
-	API []int64 `json:"api,omitempty"`
+	// Note:
+	//   OpenRTB <=2.5 defined only frameworks 1..6.
+	API []adcom1.APIFramework `json:"api,omitempty"`
 
 	// Attribute:
 	//   companiontype
diff --git a/openrtb2/bid.go b/openrtb2/bid.go
index 0831cb9..e26b881 100644
--- a/openrtb2/bid.go
+++ b/openrtb2/bid.go
@@ -208,7 +208,7 @@ type Bid struct {
 	//   List of supported APIs for the markup. If an API is not explicitly
 	//   listed, it is assumed to be unsupported. Refer to List: API
 	//   Frameworks in AdCOM 1.0.
-	APIs int64 `json:"apis,omitempty"`
+	APIs []adcom1.APIFramework `json:"apis,omitempty"`
 
 	// Attribute:
 	//   api
@@ -218,7 +218,9 @@ type Bid struct {
 	//   NOTE: Deprecated in favor of the apis integer array.
 	//   API required by the markup if applicable. Refer to List: API
 	//   Frameworks in AdCOM 1.0.
-	API int64 `json:"api,omitempty"`
+	// Note:
+	//   OpenRTB <=2.5 defined only frameworks 1..6.
+	API adcom1.APIFramework `json:"api,omitempty"`
 
 	// Attribute:
 	//   protocol
diff --git a/openrtb2/native.go b/openrtb2/native.go
index af2f60a..e7054cd 100644
--- a/openrtb2/native.go
+++ b/openrtb2/native.go
@@ -58,7 +58,9 @@ type Native struct {
 	//   List of supported API frameworks for this impression. Refer to
 	//   List: API Frameworks in AdCOM. If an API is not explicitly listed,
 	//   it is assumed not to be supported.
-	API []int64 `json:"api,omitempty"`
+	// Note:
+	//   OpenRTB <=2.5 defined only frameworks 1..6.
+	API []adcom1.APIFramework `json:"api,omitempty"`
 
 	// Attribute:
 	//   sequence
diff --git a/openrtb2/video.go b/openrtb2/video.go
index da18610..db9ab28 100644
--- a/openrtb2/video.go
+++ b/openrtb2/video.go
@@ -349,7 +349,9 @@ type Video struct {
 	//   List of supported API frameworks for this impression. Refer to
 	//   List: API Frameworks in AdCOM 1.0. If an API is not explicitly
 	//   listed, it is assumed not to be supported.
-	API []int64 `json:"api,omitempty"`
+	// Note:
+	//   OpenRTB <=2.5 defined only frameworks 1..6.
+	API []adcom1.APIFramework `json:"api,omitempty"`
 
 	// Attribute:
 	//   companiontype