diff --git a/package-lock.json b/package-lock.json
index f1c05bf..8abad2f 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -28,6 +28,7 @@
         "jose": "^5.1.0",
         "langdetect": "^0.2.1",
         "linkedom": "^0.18.4",
+        "lru-cache": "^11.0.2",
         "maxmind": "^4.3.18",
         "minio": "^7.1.3",
         "node-libcurl": "^4.1.0",
@@ -1946,6 +1947,12 @@
         "node": ">= 14"
       }
     },
+    "node_modules/@npmcli/agent/node_modules/lru-cache": {
+      "version": "10.4.3",
+      "resolved": "https://registry.npmjs.org/lru-cache/-/lru-cache-10.4.3.tgz",
+      "integrity": "sha512-JNAzZcXrCt42VGLuYz0zfAzDfAvJWW6AfYlDBQyDV5DClI2m5sAmK+OIO7s59XfsRsWHp02jAJrRadPRGTt6SQ==",
+      "license": "ISC"
+    },
     "node_modules/@npmcli/fs": {
       "version": "3.1.1",
       "resolved": "https://registry.npmjs.org/@npmcli/fs/-/fs-3.1.1.tgz",
@@ -3834,6 +3841,12 @@
         "url": "https://github.com/sponsors/isaacs"
       }
     },
+    "node_modules/cacache/node_modules/lru-cache": {
+      "version": "10.4.3",
+      "resolved": "https://registry.npmjs.org/lru-cache/-/lru-cache-10.4.3.tgz",
+      "integrity": "sha512-JNAzZcXrCt42VGLuYz0zfAzDfAvJWW6AfYlDBQyDV5DClI2m5sAmK+OIO7s59XfsRsWHp02jAJrRadPRGTt6SQ==",
+      "license": "ISC"
+    },
     "node_modules/cacache/node_modules/minimatch": {
       "version": "9.0.5",
       "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-9.0.5.tgz",
@@ -8561,9 +8574,13 @@
       "optional": true
     },
     "node_modules/lru-cache": {
-      "version": "10.4.3",
-      "resolved": "https://registry.npmjs.org/lru-cache/-/lru-cache-10.4.3.tgz",
-      "integrity": "sha512-JNAzZcXrCt42VGLuYz0zfAzDfAvJWW6AfYlDBQyDV5DClI2m5sAmK+OIO7s59XfsRsWHp02jAJrRadPRGTt6SQ=="
+      "version": "11.0.2",
+      "resolved": "https://registry.npmjs.org/lru-cache/-/lru-cache-11.0.2.tgz",
+      "integrity": "sha512-123qHRfJBmo2jXDbo/a5YOQrJoHF/GNQTLzQ5+IdK5pWpceK17yRc6ozlWd25FxvGKQbIUs91fDFkXmDHTKcyA==",
+      "license": "ISC",
+      "engines": {
+        "node": "20 || >=22"
+      }
     },
     "node_modules/lru-memoizer": {
       "version": "2.2.0",
@@ -9970,6 +9987,12 @@
         "url": "https://github.com/sponsors/isaacs"
       }
     },
+    "node_modules/path-scurry/node_modules/lru-cache": {
+      "version": "10.4.3",
+      "resolved": "https://registry.npmjs.org/lru-cache/-/lru-cache-10.4.3.tgz",
+      "integrity": "sha512-JNAzZcXrCt42VGLuYz0zfAzDfAvJWW6AfYlDBQyDV5DClI2m5sAmK+OIO7s59XfsRsWHp02jAJrRadPRGTt6SQ==",
+      "license": "ISC"
+    },
     "node_modules/path-to-regexp": {
       "version": "6.3.0",
       "resolved": "https://registry.npmjs.org/path-to-regexp/-/path-to-regexp-6.3.0.tgz",
diff --git a/package.json b/package.json
index 7f9181f..47f0ec6 100644
--- a/package.json
+++ b/package.json
@@ -37,6 +37,7 @@
     "jose": "^5.1.0",
     "langdetect": "^0.2.1",
     "linkedom": "^0.18.4",
+    "lru-cache": "^11.0.2",
     "maxmind": "^4.3.18",
     "minio": "^7.1.3",
     "node-libcurl": "^4.1.0",
diff --git a/src/dto/jina-embeddings-auth.ts b/src/dto/jina-embeddings-auth.ts
index 5a55834..5d7a27d 100644
--- a/src/dto/jina-embeddings-auth.ts
+++ b/src/dto/jina-embeddings-auth.ts
@@ -17,9 +17,18 @@ import envConfig from '../shared/services/secrets';
 import { JinaEmbeddingsDashboardHTTP } from '../shared/3rd-party/jina-embeddings';
 import { JinaEmbeddingsTokenAccount } from '../shared/db/jina-embeddings-token-account';
 
+import { LRUCache } from 'lru-cache';
 
 const authDtoLogger = logger.child({ service: 'JinaAuthDTO' });
 
+const invalidTokenLRU = new LRUCache({
+    max: 256,
+    ttl: 60 * 60 * 1000,
+    updateAgeOnGet: false,
+    updateAgeOnHas: false,
+});
+
+
 const THE_VERY_SAME_JINA_EMBEDDINGS_CLIENT = new JinaEmbeddingsDashboardHTTP(envConfig.JINA_EMBEDDINGS_DASHBOARD_API_KEY);
 
 @Also({
@@ -81,6 +90,12 @@ export class JinaEmbeddingsAuthDTO extends AutoCastable {
             });
         }
 
+        if (invalidTokenLRU.get(this.bearerToken)) {
+            throw new AuthenticationFailedError({
+                message: 'Invalid API key, please get a new one from https://jina.ai'
+            });
+        }
+
         let account;
         try {
             account = await JinaEmbeddingsTokenAccount.fromFirestore(this.bearerToken);
@@ -118,6 +133,7 @@ export class JinaEmbeddingsAuthDTO extends AutoCastable {
             authDtoLogger.warn(`Failed to get user brief: ${err}`, { err: marshalErrorLike(err) });
 
             if (err?.status === 401) {
+                invalidTokenLRU.set(this.bearerToken, true);
                 throw new AuthenticationFailedError({
                     message: 'Invalid API key, please get a new one from https://jina.ai'
                 });