diff --git a/app/assets/v2/js/cart-ethereum-zksync.js b/app/assets/v2/js/cart-ethereum-zksync.js
index a5631209dd8..3efee328b63 100644
--- a/app/assets/v2/js/cart-ethereum-zksync.js
+++ b/app/assets/v2/js/cart-ethereum-zksync.js
@@ -180,8 +180,7 @@ Vue.component('grantsCartEthereumZksync', {
       this.zksync.showModal = false; // hide checkout modal if visible
       this.resetZkSyncModal(); // reset modal settings
 
-      _alert('There is an insufficient balance to complete checkout. Please load funds and try again.', 'danger');
-      this.handleError(new Error('Insufficient balance to complete checkout')); // throw error and show to user
+      this.handleError(new Error('There is an insufficient balance to complete checkout. Please load funds and try again.')); // throw error and show to user
     },
 
     // Reset zkSync modal status after a checkout failure
@@ -217,6 +216,26 @@ Vue.component('grantsCartEthereumZksync', {
           throw new Error('Please connect a wallet');
         }
 
+        let networkId = String(Number(web3.eth.currentProvider.chainId));
+
+        if (networkId !== '1' && networkId !== '4') {
+          // User MetaMask must be connected to Ethereum mainnet
+          try {
+            await ethereum.request({
+              method: 'wallet_switchEthereumChain',
+              params: [{ chainId: '0x1' }]
+            });
+          } catch (switchError) {
+            if (switchError.code === 4001) {
+              throw new Error('Please connect MetaMask to Ethereum network.');
+            } else if (switchError.code === -32002) {
+              throw new Error('Please respond to a pending MetaMask request.');
+            } else {
+              console.error(switchError);
+            }
+          }
+        }
+
         // Make sure setup is completed properly
         const isCorrectNetwork = this.zksync.checkoutManager && this.zksync.checkoutManager.network === this.network;
 
diff --git a/app/assets/v2/js/cart.js b/app/assets/v2/js/cart.js
index 3fe6dfe67fb..d747ca61af5 100644
--- a/app/assets/v2/js/cart.js
+++ b/app/assets/v2/js/cart.js
@@ -898,7 +898,7 @@ Vue.component('grants-cart', {
       let networkName = getDataChains(networkId, 'chainId')[0] && getDataChains(networkId, 'chainId')[0].network;
 
       if (networkName == 'mainnet' && networkId !== '1') {
-        // User MetaMask must be connected to Ethereum mainnet or a supported testnet
+        // User MetaMask must be connected to Ethereum mainnet
         try {
           await ethereum.request({
             method: 'wallet_switchEthereumChain',