diff --git a/build.gradle b/build.gradle
index 52e183b..71c530d 100644
--- a/build.gradle
+++ b/build.gradle
@@ -17,7 +17,8 @@ configure(apiDependencies) {
 
 dependencies {
     // Core
-    externalPlugin 'org.mvplugins.multiverse.core:multiverse-core:5.0.0-SNAPSHOT'
+    externalPlugin 'org.mvplugins.multiverse.core:multiverse-core:5.0.0'
+    externalPlugin 'org.mvplugins.multiverse.netherportals:multiverse-netherportals:5.1.0-SNAPSHOT'
 
     // Utils
     shadowed('com.dumptruckman.minecraft:Logging:1.1.1') {
diff --git a/src/main/java/org/mvplugins/multiverse/signportals/MultiverseSignPortals.java b/src/main/java/org/mvplugins/multiverse/signportals/MultiverseSignPortals.java
index fc8d661..78ad970 100644
--- a/src/main/java/org/mvplugins/multiverse/signportals/MultiverseSignPortals.java
+++ b/src/main/java/org/mvplugins/multiverse/signportals/MultiverseSignPortals.java
@@ -8,12 +8,19 @@
 package org.mvplugins.multiverse.signportals;
 
 import com.dumptruckman.minecraft.util.Logging;
+import org.bukkit.entity.Player;
 import org.jetbrains.annotations.NotNull;
 import org.mvplugins.multiverse.core.config.CoreConfig;
 import org.mvplugins.multiverse.core.module.MultiverseModule;
+import org.mvplugins.multiverse.core.utils.ReflectHelper;
 import org.mvplugins.multiverse.core.utils.StringFormatter;
 import org.jvnet.hk2.annotations.Service;
+import org.mvplugins.multiverse.external.jakarta.inject.Inject;
+import org.mvplugins.multiverse.external.jakarta.inject.Provider;
+import org.mvplugins.multiverse.external.vavr.control.Try;
+import org.mvplugins.multiverse.netherportals.MultiverseNetherPortalsApi;
 import org.mvplugins.multiverse.signportals.listeners.SignPortalsListener;
+import org.mvplugins.multiverse.signportals.utils.PortalDetector;
 
 import java.util.logging.Logger;
 
@@ -22,6 +29,9 @@ public class MultiverseSignPortals extends MultiverseModule {
 
     private static final double TARGET_CORE_API_VERSION = 5.0;
 
+    @Inject
+    private Provider<PortalDetector> portalDetectorProvider;
+
     /** This fires before I get Enabled. */
     @Override
     public void onLoad() {
@@ -34,11 +44,27 @@ public void onEnable() {
         initializeDependencyInjection(new MultiverseSignPortalsPluginBinder(this));
         Logging.setDebugLevel(serviceLocator.getActiveService(CoreConfig.class).getGlobalDebug());
         registerDynamicListeners(SignPortalsListener.class);
+        registerNetherPortalsHandleCheck();
 
         Logging.config("Version %s (API v%s) Enabled - By %s",
                 this.getDescription().getVersion(), getVersionAsNumber(), StringFormatter.joinAnd(this.getDescription().getAuthors()));
     }
 
+    private void registerNetherPortalsHandleCheck() {
+        if (!ReflectHelper.hasClass("org.mvplugins.multiverse.netherportals.MultiverseNetherPortalsApi")) {
+            return;
+        }
+        MultiverseNetherPortalsApi.whenLoaded(api ->
+                api.getCustomPortalsHandler().registerHandleCheck(((entity, portalLocation) -> {
+                    if (!(entity instanceof Player player)) {
+                        return false;
+                    }
+                    Logging.warning("Checking if player %s can use a portal at %s", player.getName(), portalLocation);
+                    return Try.of(() -> portalDetectorProvider.get().getNotchPortalDestination(player, portalLocation) != null)
+                            .getOrElse(false);
+                })));
+    }
+
     @Override
     public void onDisable() {
         shutdownDependencyInjection();