diff --git a/api/src/main/java/com/volmit/iris/api/IrisAPI.java b/api/src/main/java/com/volmit/iris/api/IrisAPI.java
index d133a5052..332d9f315 100644
--- a/api/src/main/java/com/volmit/iris/api/IrisAPI.java
+++ b/api/src/main/java/com/volmit/iris/api/IrisAPI.java
@@ -22,8 +22,11 @@ import com.volmit.iris.Iris;
 import com.volmit.iris.core.service.RegistrySVC;
 import com.volmit.iris.core.tools.IrisToolbelt;
 import com.volmit.iris.engine.data.cache.AtomicCache;
+import com.volmit.iris.util.api.APIAwareBlock;
+import com.volmit.iris.util.api.APIWorldBlock;
 import com.volmit.iris.util.plugin.PluginRegistryGroup;
 import org.bukkit.World;
+import org.bukkit.block.Block;
 import org.bukkit.block.data.BlockData;
 
 import java.util.List;
@@ -32,6 +35,8 @@ import java.util.function.Supplier;
 public class IrisAPI
 {
     private static final AtomicCache<RegistryHolder<Supplier<BlockData>>> customBlock = new AtomicCache<>();
+    private static final AtomicCache<RegistryHolder<AwareBlockMirror>> customAwareBlock = new AtomicCache<>();
+    private static final AtomicCache<RegistryHolder<APIWorldBlock>> customWorldBlock = new AtomicCache<>();
 
     /**
      * Checks if the given world is an Iris World
@@ -113,4 +118,26 @@ public class IrisAPI
             return registry.get().getRegistry(namespace).getRegistries();
         }
     }
+
+    @FunctionalInterface
+    public interface AwareBlockMirror
+    {
+        void onPlaced(BlockData block, String namespace, String key, int x, int y, int z);
+
+        default APIAwareBlock map()
+        {
+            return this::onPlaced;
+        }
+    }
+
+    @FunctionalInterface
+    public interface WorldBlockMirror
+    {
+        void onWorldPlaced(Block block, String namespace, String key);
+
+        default APIWorldBlock map()
+        {
+            return this::onWorldPlaced;
+        }
+    }
 }
diff --git a/src/main/java/com/volmit/iris/engine/framework/EngineMetrics.java b/src/main/java/com/volmit/iris/engine/framework/EngineMetrics.java
index fe9855497..58fccbb67 100644
--- a/src/main/java/com/volmit/iris/engine/framework/EngineMetrics.java
+++ b/src/main/java/com/volmit/iris/engine/framework/EngineMetrics.java
@@ -32,6 +32,7 @@ public class EngineMetrics {
     private final AtomicRollingSequence parallaxInsert;
     private final AtomicRollingSequence post;
     private final AtomicRollingSequence perfection;
+    private final AtomicRollingSequence api;
     private final AtomicRollingSequence decoration;
     private final AtomicRollingSequence cave;
     private final AtomicRollingSequence ravine;
@@ -40,6 +41,7 @@ public class EngineMetrics {
     public EngineMetrics(int mem) {
         this.total = new AtomicRollingSequence(mem);
         this.terrain = new AtomicRollingSequence(mem);
+        this.api = new AtomicRollingSequence(mem);
         this.biome = new AtomicRollingSequence(mem);
         this.perfection = new AtomicRollingSequence(mem);
         this.parallax = new AtomicRollingSequence(mem);
@@ -62,6 +64,7 @@ public class EngineMetrics {
         v.put("post", post.getAverage());
         v.put("perfection", perfection.getAverage());
         v.put("decoration", decoration.getAverage());
+        v.put("api", api.getAverage());
         v.put("updates", updates.getAverage());
         v.put("cave", cave.getAverage());
         v.put("ravine", ravine.getAverage());
diff --git a/src/main/java/com/volmit/iris/util/api/APIAwareBlock.java b/src/main/java/com/volmit/iris/util/api/APIAwareBlock.java
new file mode 100644
index 000000000..3e01ee93f
--- /dev/null
+++ b/src/main/java/com/volmit/iris/util/api/APIAwareBlock.java
@@ -0,0 +1,27 @@
+/*
+ * Iris is a World Generator for Minecraft Bukkit Servers
+ * Copyright (c) 2021 Arcane Arts (Volmit Software)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.volmit.iris.util.api;
+
+import org.bukkit.block.data.BlockData;
+
+@FunctionalInterface
+public interface APIAwareBlock
+{
+    void onPlaced(BlockData block, String namespace, String key, int x, int y, int z);
+}
diff --git a/src/main/java/com/volmit/iris/util/api/APIWorldBlock.java b/src/main/java/com/volmit/iris/util/api/APIWorldBlock.java
new file mode 100644
index 000000000..2c7711c76
--- /dev/null
+++ b/src/main/java/com/volmit/iris/util/api/APIWorldBlock.java
@@ -0,0 +1,27 @@
+/*
+ * Iris is a World Generator for Minecraft Bukkit Servers
+ * Copyright (c) 2021 Arcane Arts (Volmit Software)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.volmit.iris.util.api;
+
+import org.bukkit.block.Block;
+
+@FunctionalInterface
+public interface APIWorldBlock
+{
+    void onWorldPlaced(Block block, String namespace, String key);
+}
\ No newline at end of file