diff --git a/e2e-nodejs/0_manual-tests/test-relayer-mint.mjs b/e2e-nodejs/0_manual-tests/test-relayer-mint.mjs
index 14de1e3c8b..abb34520f9 100644
--- a/e2e-nodejs/0_manual-tests/test-relayer-mint.mjs
+++ b/e2e-nodejs/0_manual-tests/test-relayer-mint.mjs
@@ -47,9 +47,19 @@ async function getAuthSig(wallet, litNodeClient) {
 export async function main() {
   // ==================== Setup ====================
 
+  if (!process.env.NETWORK) {
+    return fail(`NETWORK env var not set.`);
+  }
+
+  if (!['cayenne', 'habanero', 'manzano'].includes(process.env.NETWORK)) {
+    return fail(
+      `Invalid NETWORK env var set. It has to be either 'manzano', 'habanero', or 'cayenne'`
+    );
+  }
+
   // -- setting up lit node client
   const litNodeClient = new LitNodeClient({
-    litNetwork: 'manzano',
+    litNetwork: process.env.NETWORK,
     debug: true,
     checkNodeAttestation: true,
     storageProvider: {
@@ -70,7 +80,6 @@ export async function main() {
   const litAuthClient = new LitAuthClient({
     litNodeClient,
     litRelayConfig: {
-      relayUrl: 'https://manzano-relayer.getlit.dev',
       relayApiKey: '...',
     },
     debug: true,
diff --git a/packages/lit-auth-client/src/lib/lit-auth-client.ts b/packages/lit-auth-client/src/lib/lit-auth-client.ts
index 36e7f9d126..6d32eefaec 100644
--- a/packages/lit-auth-client/src/lib/lit-auth-client.ts
+++ b/packages/lit-auth-client/src/lib/lit-auth-client.ts
@@ -62,6 +62,7 @@ export class LitAuthClient {
     this.providers = new Map();
     bootstrapLogManager('auth-client');
     this.debug = options?.debug ?? false;
+
     // Check if custom relay object is provided
     if (options?.customRelay) {
       this.relay = options?.customRelay;
@@ -86,6 +87,46 @@ export class LitAuthClient {
       });
     }
 
+    // -- choose the correct relayer based on litNodeClient
+    // and if litRelayConfig.relayUrl is not set
+    if (!options?.litRelayConfig?.relayUrl) {
+      if (!options?.litRelayConfig?.relayApiKey) {
+        throw new Error(
+          '2 An API key is required to use the default Lit Relay server. Please provide either an API key or a custom relay server.'
+        );
+      }
+
+      const supportedNetworks = ['cayenne', 'habanero', 'manzano'];
+
+      if (!supportedNetworks.includes(this.litNodeClient.config.litNetwork)) {
+        throw new Error(
+          `Unsupported litNetwork: ${
+            this.litNodeClient.config.litNetwork
+          }. Supported networks are: ${supportedNetworks.join(', ')}`
+        );
+      }
+
+      let url;
+
+      switch (this.litNodeClient.config.litNetwork) {
+        case 'cayenne':
+          url = 'https://relayer-server-staging-cayenne.getlit.dev';
+          break;
+        case 'habanero':
+          url = 'https://habanero-relayer.getlit.dev';
+          break;
+        case 'manzano':
+          url = 'https://manzano-relayer.getlit.dev';
+          break;
+      }
+
+      if (this.litNodeClient.config.litNetwork)
+        this.relay = new LitRelay({
+          relayUrl: url,
+          relayApiKey: options?.litRelayConfig?.relayApiKey,
+        });
+    }
+
     // Set RPC URL
     this.rpcUrl = options?.rpcUrl || 'https://chain-rpc.litprotocol.com/http';
     log('rpc url: ', this.rpcUrl);