diff --git a/js/skama_code/api/agent.js b/js/skama_code/api/agent.js
index f3d379a..67cf836 100644
--- a/js/skama_code/api/agent.js
+++ b/js/skama_code/api/agent.js
@@ -4,6 +4,8 @@ import { SpaceTraders } from "./config.js"
 
 export class My {
   static agent = null;
+  static temp_engine = null;
+  static canvas_renderer = null;
 }
 
 export class Agent {
@@ -23,6 +25,11 @@ export class Agent {
 }
 
 export class AgentBuilder {
+  constructor(end = false) {
+    this.stopped = false;
+    this.end = end;
+  }
+
   static create(symbol, faction, callback, error_handler) {
       const url = `${SpaceTraders.host}/register`;
       $.ajax({
@@ -94,22 +101,22 @@ export class AgentBuilder {
     });
   }
 
-  static list_all(callback, end = false) {
+  static list_all(callback) {
     this.list(20, 1, (agents, meta) => {
       let maxPage = meta.total / 20;
-      this.#r_listing(2, maxPage, agents, callback, end);
+      this.#r_listing(2, maxPage, agents, callback);
     });
   }
 
-  static #r_listing(page, maxPage, agents, callback, end) {
+  static #r_listing(page, maxPage, agents, callback) {
     if (page < maxPage) {
       this.list(20, page++,() => {
         setTimeout(() => {
-          if (!end) {
+          if (!this.end) {
             callback(agents);
             agents = [];
           }
-          this.#r_listing(page++, maxPage, agents, callback, end); 
+          if (!this.stopped) this.#r_listing(page++, maxPage, agents, callback, end); 
         }, 1000);
       }, agents);
     } else {
diff --git a/js/skama_code/api/config.js b/js/skama_code/api/config.js
index 8658ac2..322ae37 100644
--- a/js/skama_code/api/config.js
+++ b/js/skama_code/api/config.js
@@ -3,5 +3,5 @@
 
 export const SpaceTraders = {
         host: "https://api.spacetraders.io/v2",
-        limit_max: 20,
+        timing: 1000,
 }
\ No newline at end of file
diff --git a/js/skama_code/api/system.js b/js/skama_code/api/system.js
index 6f9ad8a..14053af 100644
--- a/js/skama_code/api/system.js
+++ b/js/skama_code/api/system.js
@@ -12,9 +12,15 @@ export class System {
         this.type = data.type;
         this.position = new Position(data.x, data.y);
         this.factions = data.factions;
+        this.stopped = false;
+        this.end = false;
     }
 
-    get(name, callback, error_handler) {
+    when_end() {
+        this.end = true;
+    }
+
+    get_planet(name, callback, error_handler) {
         const url = `${SpaceTraders.host}/systems/${this.name}/waypoints/${name}`;
         $.ajax({
             url: url,
@@ -29,7 +35,7 @@ export class System {
         });
     } 
 
-    list(limit, page, callback, planets = []) {
+    list_planets(limit, page, callback, planets = []) {
         const url = `${SpaceTraders.host}/systems/${this.name}/waypoints`
         $.ajax({
             url: url,
@@ -47,23 +53,27 @@ export class System {
         });
     }
 
-    list_all(callback, end = false) {
-        this.list(20, 1, (planets, meta) => {
+    stop() {
+        this.stopped = true;
+    }
+
+    list_all_planets(callback, end = false) {
+        this.list_planets(20, 1, (planets, meta) => {
             let maxPage = meta.total / 20;
             this.#r_listing(2, maxPage, planets, callback, end);
         });
     }
 
-    #r_listing(page, maxPage, planets, callback, end) {
+    #r_listing(page, maxPage, planets, callback) {
         if (page < maxPage) {
-            this.list(20, page++, () => {
+            this.list_planets(20, page++, () => {
                 setTimeout(() => {
                     if (!end) {
                         callback(planets);
                         planets = [];
                     }
-                    this.#r_listing(page++, maxPage, planets, callback, end); 
-                }, 1000);
+                    if (!this.stopped) this.#r_listing(page++, maxPage, planets, callback, end); 
+                }, SpaceTraders.timing);
             }, planets);
         } else {
             callback(planets);
@@ -72,6 +82,13 @@ export class System {
 }
 
 export class SystemBuilder {
+    constructor(end = false) {
+        this.stopped = false;
+        this.end = end;
+        this.page = 1;
+
+    }
+
     static parse_system_name(name) {
         return name.split("-").slice(-1, 2).join("-");
     }
@@ -109,24 +126,27 @@ export class SystemBuilder {
         });
     }
 
-    static list_all(callback, end = false) {
-        this.list(20, 1, (systems, meta) => {
-            let maxPage = meta.total / 20;
-            this.#r_listing(2, maxPage, systems, callback, end);
+    stop() {
+        this.stopped = true;
+    }
+
+    list_all(callback) {
+        SystemBuilder.list(20, this.page, (systems, meta) => {
+            this.max_page = meta.total / 20;
+            this.#r_listing(systems, callback);
         });
     }
 
-    static #r_listing(page, maxPage, systems, callback, end) {
+    #r_listing(systems, callback) {
         if (page < maxPage) {
-            this.list(20, page++, () => {
+            SystemBuilder.list(20, this.page++, () => {
                 setTimeout(() => {
-                    if (!end) {
-                        console.log(systems);
+                    if (!this.end) {
                         callback(systems);
                         systems = [];
                     }
-                    this.#r_listing(page++, maxPage, systems, callback, end); 
-                }, 1000);
+                    if (!this.stopped) this.#r_listing(page++, maxPage, systems, callback); 
+                }, SpaceTraders.timing);
             }, systems);
         } else {
             callback(systems);
diff --git a/js/skama_code/commun/my.js b/js/skama_code/commun/my.js
new file mode 100644
index 0000000..00770e2
--- /dev/null
+++ b/js/skama_code/commun/my.js
@@ -0,0 +1,5 @@
+export class My {
+    static agent = null;
+    static temp_engine = null;
+    static canvas_renderer = null;
+}
\ No newline at end of file