diff --git a/backend/src/utils/env.js b/backend/src/utils/env.js
index d0eca36..2ec7e3c 100644
--- a/backend/src/utils/env.js
+++ b/backend/src/utils/env.js
@@ -10,6 +10,7 @@ const {
     isShadowRocket,
     isLanceX,
     isEgern,
+    isGUIforCores,
 } = ENV();
 let backend = 'Node';
 if (isNode) backend = 'Node';
@@ -20,6 +21,7 @@ if (isStash) backend = 'Stash';
 if (isShadowRocket) backend = 'ShadowRocket';
 if (isEgern) backend = 'Egern';
 if (isLanceX) backend = 'LanceX';
+if (isGUIforCores) backend = 'GUI.for.Cores';
 
 let meta = {};
 
@@ -36,6 +38,10 @@ try {
         // eslint-disable-next-line no-undef
         meta.script = $script;
     }
+    if (typeof $Plugin !== 'undefined') {
+        // eslint-disable-next-line no-undef
+        meta.plugin = $Plugin;
+    }
     if (isNode) {
         meta.node = {
             version: eval('process.version'),
diff --git a/backend/src/vendor/express.js b/backend/src/vendor/express.js
index 58d056e..4c67962 100644
--- a/backend/src/vendor/express.js
+++ b/backend/src/vendor/express.js
@@ -161,7 +161,7 @@ export default function express({ substore: $, port, host }) {
 
     function Response() {
         let statusCode = 200;
-        const { isQX, isLoon, isSurge } = ENV();
+        const { isQX, isLoon, isSurge, isGUIforCores } = ENV();
         const headers = DEFAULT_HEADERS;
         const STATUS_CODE_MAP = {
             200: 'HTTP/1.1 200 OK',
@@ -184,7 +184,7 @@ export default function express({ substore: $, port, host }) {
                     body,
                     headers,
                 };
-                if (isQX) {
+                if (isQX || isGUIforCores) {
                     $done(response);
                 } else if (isLoon || isSurge) {
                     $done({
diff --git a/backend/src/vendor/open-api.js b/backend/src/vendor/open-api.js
index fc6da24..851a8a9 100644
--- a/backend/src/vendor/open-api.js
+++ b/backend/src/vendor/open-api.js
@@ -8,6 +8,7 @@ const isStash =
 const isShadowRocket = 'undefined' !== typeof $rocket;
 const isEgern = 'object' == typeof egern;
 const isLanceX = 'undefined' != typeof $native;
+const isGUIforCores = typeof $Plugins !== 'undefined';
 
 export class OpenAPI {
     constructor(name = 'untitled', debug = false) {
@@ -48,7 +49,10 @@ export class OpenAPI {
             this.cache = JSON.parse($prefs.valueForKey(this.name) || '{}');
         if (isLoon || isSurge)
             this.cache = JSON.parse($persistentStore.read(this.name) || '{}');
-
+        if (isGUIforCores)
+            this.cache = JSON.parse(
+                $Plugins.SubStoreCache.get(this.name) || '{}',
+            );
         if (isNode) {
             // create a json for root cache
             const basePath =
@@ -86,6 +90,7 @@ export class OpenAPI {
         const data = JSON.stringify(this.cache, null, 2);
         if (isQX) $prefs.setValueForKey(data, this.name);
         if (isLoon || isSurge) $persistentStore.write(data, this.name);
+        if (isGUIforCores) $Plugins.SubStoreCache.set(this.name, data);
         if (isNode) {
             const basePath =
                 eval('process.env.SUB_STORE_DATA_BASE_PATH') || '.';
@@ -118,6 +123,9 @@ export class OpenAPI {
             if (isNode) {
                 this.root[key] = data;
             }
+            if (isGUIforCores) {
+                return $Plugins.SubStoreCache.set(key, data);
+            }
         } else {
             this.cache[key] = data;
         }
@@ -137,6 +145,9 @@ export class OpenAPI {
             if (isNode) {
                 return this.root[key];
             }
+            if (isGUIforCores) {
+                return $Plugins.SubStoreCache.get(key);
+            }
         } else {
             return this.cache[key];
         }
@@ -155,6 +166,9 @@ export class OpenAPI {
             if (isNode) {
                 delete this.root[key];
             }
+            if (isGUIforCores) {
+                return $Plugins.SubStoreCache.remove(key);
+            }
         } else {
             delete this.cache[key];
         }
@@ -220,6 +234,9 @@ export class OpenAPI {
                     });
             }
         }
+        if (isGUIforCores) {
+            $Plugins.Notify(title, subtitle + '\n' + content);
+        }
     }
 
     // other helper functions
@@ -240,7 +257,7 @@ export class OpenAPI {
     }
 
     done(value = {}) {
-        if (isQX || isLoon || isSurge) {
+        if (isQX || isLoon || isSurge || isGUIforCores) {
             $done(value);
         } else if (isNode) {
             if (typeof $context !== 'undefined') {
@@ -262,11 +279,12 @@ export function ENV() {
         isShadowRocket,
         isEgern,
         isLanceX,
+        isGUIforCores,
     };
 }
 
 export function HTTP(defaultOptions = { baseURL: '' }) {
-    const { isQX, isLoon, isSurge, isNode } = ENV();
+    const { isQX, isLoon, isSurge, isNode, isGUIforCores } = ENV();
     const methods = [
         'GET',
         'POST',
@@ -356,6 +374,33 @@ export function HTTP(defaultOptions = { baseURL: '' }) {
                         });
                 });
             });
+        } else if (isGUIforCores) {
+            worker = new Promise(async (resolve, reject) => {
+                const requestHandler = {
+                    get: $Plugins.HttpGet,
+                    head: $Plugins.HttpHead,
+                    post: $Plugins.HttpPost,
+                    put: $Plugins.HttpPut,
+                    delete: $Plugins.HttpDelete,
+                };
+                const request = requestHandler[method.toLowerCase()];
+                if (!request)
+                    reject(
+                        '[GUI.for.Cores] This method is not implemented: ' +
+                            method,
+                    );
+                try {
+                    const { url, headers } = options;
+                    const response = await request(url, headers, options.body);
+                    resolve({
+                        statusCode: response.status ?? 200,
+                        headers: response.header,
+                        body: response.body,
+                    });
+                } catch (error) {
+                    reject(error);
+                }
+            });
         }
 
         let timeoutid;