diff --git a/src/walletapp.js b/src/walletapp.js
index e32d3f5..d6e5f2c 100644
--- a/src/walletapp.js
+++ b/src/walletapp.js
@@ -168,7 +168,7 @@ BusyModal.propTypes = {
 
 export class WalletApp extends React.Component {
   state = {
-    web3sol: new Web3Sol('master.testnet.solana.com'), // TODO: make endpoint configurable by the user
+    web3sol: new Web3Sol('http://master.testnet.solana.com:8899'), // TODO: make endpoint configurable by the user
     errors: [],
     busyModal: null,
     publicKey: '',
diff --git a/src/web3-sol.js b/src/web3-sol.js
index 8bfbfd7..0f87fb7 100644
--- a/src/web3-sol.js
+++ b/src/web3-sol.js
@@ -5,6 +5,7 @@
 
 import nacl from 'tweetnacl';
 import bs58 from 'bs58';
+import joi from 'joi';
 
 import {createRpcClient} from './rpc-client';
 
@@ -32,7 +33,23 @@ export class Web3Sol {
   }
 
   async getBalance() {
-    await sleep(500); // TODO
+    try {
+      const res = await this.rpcClient.request(
+        'getBalance',
+        [bs58.encode(this.keypair.publicKey)]
+      );
+      console.log('getBalance result', res);
+      if (res.error) {
+        throw new Error(res.error.message);
+      }
+      this.balance = joi.attempt(
+        res.result,
+        joi.number().required().min(0)
+      );
+    } catch (err) {
+      console.log('Failed to getBalance:', err);
+    }
+
     return this.balance;
   }
 
diff --git a/webpack.config.js b/webpack.config.js
index 4f4ce7c..3b22d52 100644
--- a/webpack.config.js
+++ b/webpack.config.js
@@ -22,6 +22,11 @@ module.exports = {
       },
     ]
   },
+  node: {
+    net: 'empty',
+    tls: 'empty',
+    dns: 'empty',
+  },
   resolve: {
     extensions: ['*', '.js', '.jsx']
   },