diff --git a/BUILD.gn b/BUILD.gn
index d23e5eed915b..b92141ef093e 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -8,6 +8,7 @@ group("child_dependencies") {
 group("browser_dependencies") {
   public_deps = [
     "//brave/browser",
+    "//brave/common/extensions/api"
   ]
 }
 
diff --git a/browser/resources/resource_ids b/browser/resources/resource_ids
new file mode 100644
index 000000000000..efb9a371f655
--- /dev/null
+++ b/browser/resources/resource_ids
@@ -0,0 +1,7 @@
+# Resource ids starting at 31000 are reserved for projects built on Chromium.
+{
+  "SRCDIR": "../../..",
+  "brave/common/extensions/api/brave_api_resources.grd": {
+    "includes": [32000],
+  },
+}
diff --git a/common/extensions/api/BUILD.gn b/common/extensions/api/BUILD.gn
new file mode 100644
index 000000000000..8a1495fbd881
--- /dev/null
+++ b/common/extensions/api/BUILD.gn
@@ -0,0 +1,74 @@
+import("//tools/json_schema_compiler/json_features.gni")
+import("//tools/json_schema_compiler/json_schema_api.gni")
+import("//tools/grit/grit_rule.gni")
+json_features("api_features") {
+  feature_type = "APIFeature"
+  provider_class = "BraveAPIFeatureProvider"
+  sources = [
+    "//chrome/common/extensions/api/_api_features.json",
+    "//extensions/common/api/_api_features.json",
+    "_api_features.json",
+  ]
+}
+
+json_features("permission_features") {
+  feature_type = "PermissionFeature"
+  provider_class = "BravePermissionFeatureProvider"
+  sources = [
+    "//chrome/common/extensions/api/_permission_features.json",
+    "//extensions/common/api/_permission_features.json",
+  ]
+}
+
+json_features("manifest_features") {
+  feature_type = "ManifestFeature"
+  provider_class = "BraveManifestFeatureProvider"
+  sources = [
+    "//chrome/common/extensions/api/_manifest_features.json",
+    "//extensions/common/api/_manifest_features.json",
+  ]
+}
+
+json_features("behavior_features") {
+  feature_type = "BehaviorFeature"
+  provider_class = "BraveBehaviorFeatureProvider"
+  sources = [
+    "//extensions/common/api/_behavior_features.json",
+  ]
+}
+
+grit("resources") {
+  source = "brave_api_resources.grd"
+  outputs = [
+    "grit/brave_api_resources.h",
+    "brave_api_resources.pak",
+  ]
+  resource_ids = "//brave/browser/resources/resource_ids"
+}
+
+json_schema_api("generated_api") {
+  sources = [
+    "brave_shields.json"
+  ]
+  deps = [
+    "//chrome/common/extensions/api",
+    "//extensions/common/api",
+    ":api_features",
+    ":permission_features",
+    ":manifest_features",
+    ":behavior_features",
+    ":resources",
+  ]
+  root_namespace = "extensions::api::%(namespace)s"
+  schemas = true
+  bundle = true
+  bundle_registration = true
+  bundle_name = "Brave"
+  impl_dir = "//brave/common/extensions/api"
+}
+
+group("api") {
+  public_deps = [
+    ":generated_api",
+  ]
+}
diff --git a/common/extensions/api/_api_features.json b/common/extensions/api/_api_features.json
new file mode 100644
index 000000000000..d320aadde14e
--- /dev/null
+++ b/common/extensions/api/_api_features.json
@@ -0,0 +1,11 @@
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+{
+  "braveShields": {
+    "channel": "stable",
+    "dependencies": [],
+    "contexts": ["blessed_extension"]
+  }
+}
diff --git a/common/extensions/api/brave_api_resources.grd b/common/extensions/api/brave_api_resources.grd
new file mode 100644
index 000000000000..c1ef5c7ff833
--- /dev/null
+++ b/common/extensions/api/brave_api_resources.grd
@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<grit latest_public_release="0" current_release="1" output_all_resource_defines="false">
+  <outputs>
+    <output filename="grit/brave_api_resources.h" type="rc_header">
+      <emit emit_type='prepend'></emit>
+    </output>
+    <output filename="brave_api_resources.pak" type="data_package" />
+  </outputs>
+  <release seq="1">
+    <includes>
+      <include name="IDR_BRAVE_EXTENSION_API_FEATURES" file="_api_features.json" type="BINDATA" />
+    </includes>
+  </release>
+</grit>
diff --git a/components/brave_shields/browser/brave_shields_web_contents_observer.cc b/components/brave_shields/browser/brave_shields_web_contents_observer.cc
index 7b04e37247b4..f825da1770e9 100644
--- a/components/brave_shields/browser/brave_shields_web_contents_observer.cc
+++ b/components/brave_shields/browser/brave_shields_web_contents_observer.cc
@@ -6,7 +6,7 @@
 
 #include "chrome/browser/extensions/extension_tab_util.h"
 #include "chrome/browser/profiles/profile.h"
-#include "chrome/common/extensions/api/brave_shields.h"
+#include "brave/common/extensions/api/brave_shields.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/render_frame_host.h"
 #include "content/public/browser/web_contents.h"
diff --git a/patches/master_patch.patch b/patches/master_patch.patch
index 8a590732a64c..561d5c05182f 100644
--- a/patches/master_patch.patch
+++ b/patches/master_patch.patch
@@ -206,18 +206,28 @@ index 9361b28fb3ac91e61837d7c707e9f4a9ec73c7c6..c5eee899ae5f42b974645240f17aabeb
    friend class DisableWebRtcEncryptionFlagTest;
    friend class InProcessBrowserTest;
  
-diff --git a/chrome/browser/io_thread.cc b/chrome/browser/io_thread.cc
-index 4161673ba0f9ec6a079436469e5a6579ff1e88cc..b1dfe5add2d5a69f8fc305610e591333e821ffdc 100644
---- a/chrome/browser/io_thread.cc
-+++ b/chrome/browser/io_thread.cc
-@@ -30,6 +30,7 @@
- #include "base/threading/thread.h"
- #include "base/time/time.h"
- #include "base/trace_event/trace_event.h"
-+#include "brave/browser/net/brave_network_delegate.h"
+diff --git a/chrome/browser/extensions/chrome_extensions_browser_client.cc b/chrome/browser/extensions/chrome_extensions_browser_client.cc
+index 4398370da586e80f51b5e8517a49174236fa78c3..3b5d2a849aaa5c4d5bbd4feaaee640ccc0edefbd 100644
+--- a/chrome/browser/extensions/chrome_extensions_browser_client.cc
++++ b/chrome/browser/extensions/chrome_extensions_browser_client.cc
+@@ -10,6 +10,7 @@
+ #include "base/memory/ptr_util.h"
+ #include "base/version.h"
  #include "build/build_config.h"
++#include "brave/common/extensions/api/generated_api_registration.h"
+ #include "chrome/browser/app_mode/app_mode_utils.h"
  #include "chrome/browser/browser_process.h"
- #include "chrome/browser/data_usage/tab_id_annotator.h"
+ #include "chrome/browser/extensions/activity_log/activity_log.h"
+@@ -277,6 +278,9 @@ void ChromeExtensionsBrowserClient::RegisterExtensionFunctions(
+ 
+   // Generated APIs from Chrome.
+   api::ChromeGeneratedFunctionRegistry::RegisterAll(registry);
++
++  // Generated APIs from Brave.
++  api::BraveGeneratedFunctionRegistry::RegisterAll(registry);
+ }
+ 
+ void ChromeExtensionsBrowserClient::RegisterExtensionInterfaces(
 diff --git a/chrome/browser/net/chrome_network_delegate.h b/chrome/browser/net/chrome_network_delegate.h
 index e055ef156da9ea78b1dee96ee04f9c061267c775..5ffcecf64f39f3ff593cd30d9c1ef551be5f1a27 100644
 --- a/chrome/browser/net/chrome_network_delegate.h
@@ -291,37 +301,89 @@ index 99a3f816756039a628dc3032cbda3971dd415138..2cf32156411bd3a28e8c8096e25dcee5
  #error Unknown branding
  #endif
 diff --git a/chrome/common/extensions/api/BUILD.gn b/chrome/common/extensions/api/BUILD.gn
-index ad3703177d68941b91d570bcfa001848ffa179a9..727d534ae2bce1e5f1105cf2c3a2318f10302b6d 100644
+index ad3703177d68941b91d570bcfa001848ffa179a9..deae657f78e081a46b551569e626d84d6cd76c2d 100644
 --- a/chrome/common/extensions/api/BUILD.gn
 +++ b/chrome/common/extensions/api/BUILD.gn
-@@ -84,6 +84,12 @@ schema_sources = [
+@@ -84,6 +84,7 @@ schema_sources = [
    "webstore_widget_private.idl",
    "windows.json",
  ]
-+
-+# Add Brave extension resources here
-+schema_sources += [
-+  "brave_shields.json"
-+]
 +
  if (!is_android) {
    schema_sources += [ "processes.idl" ]
  }
-diff --git a/chrome/common/extensions/api/_api_features.json b/chrome/common/extensions/api/_api_features.json
-index 8ec1de091af1a17127e66bc67c6ee7cb8b5c2be3..0686739f34df6198129d2a9a363fba00da4a537e 100644
---- a/chrome/common/extensions/api/_api_features.json
-+++ b/chrome/common/extensions/api/_api_features.json
-@@ -826,5 +826,9 @@
-     "matches": [
-       "chrome://bookmarks/*"
-     ]
--  }]
-+  }],
-+  "braveShields": {
-+    "dependencies": ["permission:contentSettings"],
-+    "contexts": ["blessed_extension"]
-+  }
+diff --git a/chrome/common/extensions/chrome_extensions_client.cc b/chrome/common/extensions/chrome_extensions_client.cc
+index c4b6d014fe94d37a0e16802e7c644a990326d6f4..86e4cd06c08af21c7ff8b664010316e3f304959c 100644
+--- a/chrome/common/extensions/chrome_extensions_client.cc
++++ b/chrome/common/extensions/chrome_extensions_client.cc
+@@ -13,6 +13,13 @@
+ #include "base/metrics/histogram_macros.h"
+ #include "base/strings/string_util.h"
+ #include "base/values.h"
++#include "brave/common/extensions/api/api_features.h"
++#include "brave/common/extensions/api/behavior_features.h"
++#include "brave/common/extensions/api/generated_api_registration.h"
++#include "brave/common/extensions/api/generated_schemas.h"
++#include "brave/common/extensions/api/grit/brave_api_resources.h"
++#include "brave/common/extensions/api/manifest_features.h"
++#include "brave/common/extensions/api/permission_features.h"
+ #include "chrome/common/chrome_content_client.h"
+ #include "chrome/common/chrome_switches.h"
+ #include "chrome/common/extensions/api/api_features.h"
+@@ -108,6 +115,7 @@ void ChromeExtensionsClient::Initialize() {
+   if (!ManifestHandler::IsRegistrationFinalized()) {
+     RegisterCommonManifestHandlers();
+     RegisterChromeManifestHandlers();
++    // RegisterBraveManifestHandlers();
+     ManifestHandler::FinalizeRegistration();
+   }
+ 
+@@ -142,13 +150,13 @@ std::unique_ptr<FeatureProvider> ChromeExtensionsClient::CreateFeatureProvider(
+     const std::string& name) const {
+   std::unique_ptr<FeatureProvider> provider;
+   if (name == "api") {
+-    provider.reset(new APIFeatureProvider());
++    provider.reset(new BraveAPIFeatureProvider());
+   } else if (name == "manifest") {
+-    provider.reset(new ManifestFeatureProvider());
++    provider.reset(new BraveManifestFeatureProvider());
+   } else if (name == "permission") {
+-    provider.reset(new PermissionFeatureProvider());
++    provider.reset(new BravePermissionFeatureProvider());
+   } else if (name == "behavior") {
+-    provider.reset(new BehaviorFeatureProvider());
++    provider.reset(new BraveBehaviorFeatureProvider());
+   } else {
+     NOTREACHED();
+   }
+@@ -161,6 +169,7 @@ ChromeExtensionsClient::CreateAPIFeatureSource() const {
+       new JSONFeatureProviderSource("api"));
+   source->LoadJSON(IDR_EXTENSION_API_FEATURES);
+   source->LoadJSON(IDR_CHROME_EXTENSION_API_FEATURES);
++  source->LoadJSON(IDR_BRAVE_EXTENSION_API_FEATURES);
+   return source;
+ }
+ 
+@@ -238,7 +247,8 @@ bool ChromeExtensionsClient::IsScriptableURL(
+ bool ChromeExtensionsClient::IsAPISchemaGenerated(
+     const std::string& name) const {
+   // Test from most common to least common.
+-  return api::ChromeGeneratedSchemas::IsGenerated(name) ||
++  return api::BraveGeneratedSchemas::IsGenerated(name) ||
++         api::ChromeGeneratedSchemas::IsGenerated(name) ||
+          api::GeneratedSchemas::IsGenerated(name);
+ }
+ 
+@@ -248,6 +258,9 @@ base::StringPiece ChromeExtensionsClient::GetAPISchema(
+   if (api::ChromeGeneratedSchemas::IsGenerated(name))
+     return api::ChromeGeneratedSchemas::Get(name);
+ 
++  if (api::BraveGeneratedSchemas::IsGenerated(name))
++    return api::BraveGeneratedSchemas::Get(name);
++
+   return api::GeneratedSchemas::Get(name);
  }
+ 
 diff --git a/chrome/common/mac/app_mode_chrome_locator.mm b/chrome/common/mac/app_mode_chrome_locator.mm
 index efd272e706ba56b748e4b76b96d76cbd03aa07ac..5ce343302a2ab3a18a9149a33203f5a2fe301b23 100644
 --- a/chrome/common/mac/app_mode_chrome_locator.mm