diff --git a/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/MiraiConsole.kt b/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/MiraiConsole.kt
index 5af616e88..19707ba29 100644
--- a/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/MiraiConsole.kt
+++ b/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/MiraiConsole.kt
@@ -18,8 +18,8 @@ import kotlinx.coroutines.Job
 import net.mamoe.mirai.Bot
 import net.mamoe.mirai.console.MiraiConsole.INSTANCE
 import net.mamoe.mirai.console.MiraiConsoleImplementation.Companion.start
+import net.mamoe.mirai.console.extension.foldExtensions
 import net.mamoe.mirai.console.extensions.BotConfigurationAlterer
-import net.mamoe.mirai.console.extensions.foldExtensions
 import net.mamoe.mirai.console.internal.MiraiConsoleImplementationBridge
 import net.mamoe.mirai.console.plugin.PluginLoader
 import net.mamoe.mirai.console.plugin.PluginManager
diff --git a/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/extensions/AbstractExtensionPoint.kt b/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/extension/AbstractExtensionPoint.kt
similarity index 98%
rename from backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/extensions/AbstractExtensionPoint.kt
rename to backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/extension/AbstractExtensionPoint.kt
index 5a5f41cf9..f6ddcc561 100644
--- a/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/extensions/AbstractExtensionPoint.kt
+++ b/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/extension/AbstractExtensionPoint.kt
@@ -9,7 +9,7 @@
 
 @file:Suppress("unused", "INVISIBLE_MEMBER", "INVISIBLE_REFERENCE")
 
-package net.mamoe.mirai.console.extensions
+package net.mamoe.mirai.console.extension
 
 import net.mamoe.mirai.console.internal.data.kClassQualifiedNameOrTip
 import net.mamoe.mirai.console.plugin.Plugin
diff --git a/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/extension/Extension.kt b/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/extension/Extension.kt
new file mode 100644
index 000000000..0c0250174
--- /dev/null
+++ b/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/extension/Extension.kt
@@ -0,0 +1,40 @@
+/*
+ * Copyright 2020 Mamoe Technologies and contributors.
+ *
+ * 此源代码的使用受 GNU AFFERO GENERAL PUBLIC LICENSE version 3 许可证的约束, 可以在以下链接找到该许可证.
+ * Use of this source code is governed by the GNU AGPLv3 license that can be found through the following link.
+ *
+ * https://github.com/mamoe/mirai/blob/master/LICENSE
+ */
+
+package net.mamoe.mirai.console.extension
+
+import net.mamoe.mirai.console.extensions.PermissionServiceProvider
+import net.mamoe.mirai.console.extensions.PluginLoaderProvider
+import net.mamoe.mirai.console.util.ConsoleExperimentalAPI
+
+@ConsoleExperimentalAPI
+public interface Extension
+
+@ConsoleExperimentalAPI
+public interface FunctionExtension : Extension
+
+/**
+ * 为某单例服务注册的 [Extension].
+ *
+ * @see PermissionServiceProvider
+ */
+@ConsoleExperimentalAPI
+public interface SingletonExtension<T> : Extension {
+    public val instance: T
+}
+
+/**
+ * 为一些实例注册的 [Extension].
+ *
+ * @see PluginLoaderProvider
+ */
+@ConsoleExperimentalAPI
+public interface InstanceExtension<T> : Extension {
+    public val instance: T
+}
diff --git a/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/extensions/BotConfigurationAlterer.kt b/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/extensions/BotConfigurationAlterer.kt
index d48f6d9bf..69eda41c4 100644
--- a/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/extensions/BotConfigurationAlterer.kt
+++ b/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/extensions/BotConfigurationAlterer.kt
@@ -3,6 +3,8 @@
 package net.mamoe.mirai.console.extensions
 
 import net.mamoe.mirai.console.MiraiConsole
+import net.mamoe.mirai.console.extension.AbstractExtensionPoint
+import net.mamoe.mirai.console.extension.FunctionExtension
 import net.mamoe.mirai.console.util.ConsoleExperimentalAPI
 import net.mamoe.mirai.utils.BotConfiguration
 
@@ -12,7 +14,7 @@ import net.mamoe.mirai.utils.BotConfiguration
  * @see MiraiConsole.addBot
  */
 @ConsoleExperimentalAPI
-public interface BotConfigurationAlterer {
+public interface BotConfigurationAlterer : FunctionExtension {
 
     /**
      * 修改 [configuration], 返回修改完成的 [BotConfiguration]
diff --git a/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/extensions/MiraiConsoleServices.kt b/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/extensions/MiraiConsoleServices.kt
deleted file mode 100644
index af3f79bf5..000000000
--- a/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/extensions/MiraiConsoleServices.kt
+++ /dev/null
@@ -1,22 +0,0 @@
-package net.mamoe.mirai.console.extensions
-
-import net.mamoe.mirai.console.internal.util.PluginServiceHelper
-import kotlin.reflect.KClass
-
-// not public now
-internal object ServiceContainer {
-    private val instances: MutableMap<KClass<*>, List<*>> = mutableMapOf()
-
-    @Suppress("UNCHECKED_CAST")
-    @JvmStatic
-    @Synchronized
-    fun <T : Any> getService(clazz: KClass<T>): List<T> {
-        instances[clazz]?.let { return it as List<T> }
-        PluginServiceHelper.loadAllServicesFromMemoryAndPluginClassLoaders(clazz).let {
-            instances[clazz] = it
-            return it
-        }
-    }
-
-    inline fun <reified T : Any> getService(): List<T> = getService(T::class)
-}
\ No newline at end of file
diff --git a/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/extensions/PermissionServiceProvider.kt b/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/extensions/PermissionServiceProvider.kt
new file mode 100644
index 000000000..2d35375d8
--- /dev/null
+++ b/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/extensions/PermissionServiceProvider.kt
@@ -0,0 +1,12 @@
+package net.mamoe.mirai.console.extensions
+
+import net.mamoe.mirai.console.extension.AbstractExtensionPoint
+import net.mamoe.mirai.console.extension.SingletonExtension
+import net.mamoe.mirai.console.permission.PermissionService
+import net.mamoe.mirai.console.util.ConsoleExperimentalAPI
+
+@ConsoleExperimentalAPI
+public interface PermissionServiceProvider : SingletonExtension<PermissionService> {
+    public companion object ExtensionPoint :
+        AbstractExtensionPoint<PermissionServiceProvider>(PermissionServiceProvider::class)
+}
\ No newline at end of file
diff --git a/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/extensions/PluginLoaderProvider.kt b/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/extensions/PluginLoaderProvider.kt
index e0410f9ac..cf2271981 100644
--- a/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/extensions/PluginLoaderProvider.kt
+++ b/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/extensions/PluginLoaderProvider.kt
@@ -1,12 +1,12 @@
 package net.mamoe.mirai.console.extensions
 
+import net.mamoe.mirai.console.extension.AbstractExtensionPoint
+import net.mamoe.mirai.console.extension.InstanceExtension
 import net.mamoe.mirai.console.plugin.PluginLoader
 
 /**
  * 提供扩展 [PluginLoader]
  */
-public interface PluginLoaderProvider {
-    public val instance: PluginLoader<*, *>
-
+public interface PluginLoaderProvider : InstanceExtension<PluginLoader<*, *>> {
     public companion object ExtensionPoint : AbstractExtensionPoint<PluginLoaderProvider>(PluginLoaderProvider::class)
 }
\ No newline at end of file
diff --git a/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/internal/plugin/PluginManagerImpl.kt b/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/internal/plugin/PluginManagerImpl.kt
index 03035b668..4bec6f753 100644
--- a/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/internal/plugin/PluginManagerImpl.kt
+++ b/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/internal/plugin/PluginManagerImpl.kt
@@ -15,8 +15,8 @@ import kotlinx.atomicfu.locks.withLock
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Job
 import net.mamoe.mirai.console.MiraiConsole
+import net.mamoe.mirai.console.extension.useExtensions
 import net.mamoe.mirai.console.extensions.PluginLoaderProvider
-import net.mamoe.mirai.console.extensions.useExtensions
 import net.mamoe.mirai.console.internal.data.cast
 import net.mamoe.mirai.console.internal.data.mkdir
 import net.mamoe.mirai.console.plugin.*
diff --git a/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/permission/PermissionService.kt b/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/permission/PermissionService.kt
new file mode 100644
index 000000000..63b0b43f0
--- /dev/null
+++ b/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/permission/PermissionService.kt
@@ -0,0 +1,19 @@
+/*
+ * Copyright 2020 Mamoe Technologies and contributors.
+ *
+ * 此源代码的使用受 GNU AFFERO GENERAL PUBLIC LICENSE version 3 许可证的约束, 可以在以下链接找到该许可证.
+ * Use of this source code is governed by the GNU AGPLv3 license that can be found through the following link.
+ *
+ * https://github.com/mamoe/mirai/blob/master/LICENSE
+ */
+
+package net.mamoe.mirai.console.permission
+
+import net.mamoe.mirai.console.extensions.PermissionServiceProvider
+import net.mamoe.mirai.console.util.ConsoleExperimentalAPI
+
+/**
+ * [PermissionServiceProvider]
+ */
+@ConsoleExperimentalAPI
+public interface PermissionService
\ No newline at end of file
diff --git a/buildSrc/src/main/kotlin/Versions.kt b/buildSrc/src/main/kotlin/Versions.kt
index 9034e5f2c..3970cc2a4 100644
--- a/buildSrc/src/main/kotlin/Versions.kt
+++ b/buildSrc/src/main/kotlin/Versions.kt
@@ -18,7 +18,7 @@
 
 object Versions {
     const val core = "1.2.2"
-    const val console = "1.0-M4-dev-3"
+    const val console = "1.0-M4-dev-4"
     const val consoleGraphical = "0.0.7"
     const val consoleTerminal = "0.1.0"
     const val consolePure = console