diff --git a/create-card.js b/create-card.js
index ede85e0..99e6b3b 100644
--- a/create-card.js
+++ b/create-card.js
@@ -1,14 +1,8 @@
 const fetch = require("node-fetch");
 const path = require("path");
 const { createCanvas, loadImage, registerFont } = require("canvas");
-const createilvlfilter = require('./createilvlfilter')
 
-let ilvlarray;
-console.log('Generating ilvl filter')
-createilvlfilter().then((ilvlfilter) => {
-  ilvlarray = ilvlfilter;
-  console.log("ilvl filter generated!")
-})
+const createIlvlFilter = require('./create-ilvl-filter');
 
 function absolute(relativePath) {
     return path.join(__dirname, relativePath);
@@ -192,6 +186,8 @@ class CardCreator {
       this.imgJobBg[i] = await loadImage(absolute(`./resources/class-jobs-backgrounds/${i}.png`));
     }
 
+    this.ilvlFilterIds = await createIlvlFilter(this.xivApiKey);
+
     await this.countMountsMinions();
   }
 
@@ -251,7 +247,6 @@ class CardCreator {
     var mainHandLvl = 0;
     var hasOffHand = false;
 
-    console.log(ilvlarray)
     for (var key in gearset) {
       var piece = gearset[key];
 
@@ -264,7 +259,7 @@ class CardCreator {
       if (key == 'OffHand')
         hasOffHand = true;
 
-      if(ilvlarray.includes(piece.Item.ID) == true) {
+      if (this.ilvlFilterIds.includes(piece.Item.ID) == true) {
         ilvl += 1;
       } else {
         ilvl += piece.Item.LevelItem;
diff --git a/create-ilvl-filter.js b/create-ilvl-filter.js
new file mode 100644
index 0000000..c9bab1b
--- /dev/null
+++ b/create-ilvl-filter.js
@@ -0,0 +1,33 @@
+const fetch = require('node-fetch');
+
+const itemUICategory = [
+  1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20,
+  21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
+  41, 42, 43, 84, 87, 88, 89, 96, 97, 98, 99, 105, 106, 107,
+];
+
+// Returns a list of item IDs that, when equipped, increase the iLvl by 1
+async function createIlvlFilter(xivApiKey = undefined) {
+  const itemIds = [];
+
+  // Fetch for each category one after another to prevent rate limiting
+  // This should only by needed on startup, so a longer caching time is ok
+  for (const category of itemUICategory) {
+    const url = new URL('https://xivapi.com/search');
+    url.searchParams.set('indexes', 'item');
+    url.searchParams.set('filters', `IsIndisposable=1,ItemUICategoryTargetID=${category}`);
+    if (typeof xivApiKey === 'string' && xivApiKey !== '') url.searchParams.set('private_key', xivApiKey);
+
+    const response = await fetch(url.toString());
+    const data = await response.json();
+
+    if (data != null && Array.isArray(data.Results)) {
+      for (const item of data.Results) {
+        itemIds.push(item.ID);
+      }
+    }
+  }
+  return itemIds;
+}
+
+module.exports = createIlvlFilter
diff --git a/createilvlfilter.js b/createilvlfilter.js
deleted file mode 100644
index 08c7333..0000000
--- a/createilvlfilter.js
+++ /dev/null
@@ -1,27 +0,0 @@
-const fetch = require("node-fetch");
-
-const itemUICategory = [
-  1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 84, 87, 88, 89, 96, 97, 98, 99,
-  105, 106, 107,
-];
-
-async function createilvlfilter() {
-  let results = [];
-  for (const category of itemUICategory) {
-    let url = `https://xivapi.com/search?indexes=item&filters=IsIndisposable=1,ItemUICategoryTargetID=${category}`;
-    const response = await fetch(url);
-    const data = response.json();
-    data.then((payload) => {
-      if (payload.Pagination.Results === 0) {
-        return;
-      }
-      for (const item of payload.Results) {
-        let part = item.ID
-        results.push(part);
-      }
-    });
-  }
-  return results;
-}
-
-module.exports = createilvlfilter