diff --git a/exosphere/src/configitem.c b/exosphere/src/configitem.c
index 79c351338..7244fa692 100644
--- a/exosphere/src/configitem.c
+++ b/exosphere/src/configitem.c
@@ -9,6 +9,7 @@
 #include "utils.h"
 #include "masterkey.h"
 #include "exocfg.h"
+#include "version.h"
 
 static bool g_battery_profile = false;
 
@@ -132,6 +133,10 @@ uint32_t configitem_get(ConfigItem item, uint64_t *p_outvalue) {
                 result = 2;
             }
             break;
+        case CONFIGITEM_EXOSPHERE_VERSION:
+            /* UNOFFICIAL: Gets information about the current exosphere version. */
+            *p_outvalue = (EXOSPHERE_RELEASE_VERSION_MAJOR << 24) | (EXOSPHERE_RELEASE_VERSION_MINOR << 16) | (exosphere_get_target_firmware() << 8) | (mkey_get_revision() << 0);
+            break;
         default:
             result = 2;
             break;
diff --git a/exosphere/src/configitem.h b/exosphere/src/configitem.h
index c9cd1d699..8ff65af8a 100644
--- a/exosphere/src/configitem.h
+++ b/exosphere/src/configitem.h
@@ -21,7 +21,10 @@ typedef enum {
     CONFIGITEM_ODM4BIT10_4X = 14,
     CONFIGITEM_NEWHARDWARETYPE_5X = 15,
     CONFIGITEM_NEWKEYGENERATION_5X = 16,
-    CONFIGITEM_PACKAGE2HASH_5X = 17
+    CONFIGITEM_PACKAGE2HASH_5X = 17,
+    
+    /* These are unofficial, for usage by Exosphere. */
+    CONFIGITEM_EXOSPHERE_VERSION = 65000
 } ConfigItem;
 
 uint32_t configitem_set(ConfigItem item, uint64_t value);
diff --git a/exosphere/src/version.h b/exosphere/src/version.h
new file mode 100644
index 000000000..a22c9027f
--- /dev/null
+++ b/exosphere/src/version.h
@@ -0,0 +1,7 @@
+#ifndef EXOSPHERE_VERSION_H
+#define EXOSPHERE_VERSION_H
+
+#define EXOSPHERE_RELEASE_VERSION_MAJOR 0
+#define EXOSPHERE_RELEASE_VERSION_MINOR 1
+
+#endif
\ No newline at end of file
diff --git a/stratosphere/loader/source/ldr_main.cpp b/stratosphere/loader/source/ldr_main.cpp
index 379a7f9cc..f2075abe8 100644
--- a/stratosphere/loader/source/ldr_main.cpp
+++ b/stratosphere/loader/source/ldr_main.cpp
@@ -63,6 +63,18 @@ void __appInit(void) {
     if (R_FAILED(rc))  {
         fatalSimple(0xCAFE << 4 | 2);
     }
+    
+    rc = splInitialize();
+    if (R_FAILED(rc))  {
+        fatalSimple(0xCAFE << 4 | 3);
+    }
+    
+    /* Check for exosphere API compatibility. */
+    u64 exosphere_cfg;
+    if (R_FAILED(splGetConfig((SplConfigItem)65000, &exosphere_cfg))) {
+        fatalSimple(0xCAFE << 4 | 0xFF);
+        /* TODO: Does Loader need to know about target firmware/master key revision? If so, extract from exosphere_cfg. */
+    }
 }
 
 void __appExit(void) {
diff --git a/stratosphere/pm/source/pm_main.cpp b/stratosphere/pm/source/pm_main.cpp
index 909923cf1..5a65793fd 100644
--- a/stratosphere/pm/source/pm_main.cpp
+++ b/stratosphere/pm/source/pm_main.cpp
@@ -70,13 +70,19 @@ void __appInit(void) {
     
     rc = smManagerInitialize();
     if (R_FAILED(rc))  {
-        fatalSimple(0xCAFE << 4 | 4);
+        fatalSimple(0xCAFE << 4 | 5);
     }
     
-    
     rc = splInitialize();
     if (R_FAILED(rc))  {
-        fatalSimple(0xCAFE << 4 | 5);
+        fatalSimple(0xCAFE << 4 | 6);
+    }
+    
+    /* Check for exosphere API compatibility. */
+    u64 exosphere_cfg;
+    if (R_FAILED(splGetConfig((SplConfigItem)65000, &exosphere_cfg))) {
+        fatalSimple(0xCAFE << 4 | 0xFF);
+        /* TODO: Does PM need to know about target firmware/master key revision? If so, extract from exosphere_cfg. */
     }
 }
 
diff --git a/stratosphere/sm/source/sm_main.cpp b/stratosphere/sm/source/sm_main.cpp
index aa1fe0f8d..e68b6674d 100644
--- a/stratosphere/sm/source/sm_main.cpp
+++ b/stratosphere/sm/source/sm_main.cpp
@@ -38,7 +38,7 @@ void __libnx_initheap(void) {
 }
 
 void __appInit(void) {
-    /* We must do nothing here, because we are sm. */
+    /* We must do no setup here, because we are sm. */
 }
 
 void __appExit(void) {