diff --git a/packages/web-components/src/wallet-connection/walletConnection.js b/packages/web-components/src/wallet-connection/walletConnection.js
index 2fe1760..557500f 100644
--- a/packages/web-components/src/wallet-connection/walletConnection.js
+++ b/packages/web-components/src/wallet-connection/walletConnection.js
@@ -8,7 +8,7 @@ import { Errors } from '../errors.js';
 /**
  * @param {any} chainStorageWatcher
  * @param {string} rpc
- * @param {((error: unknown) => void)=} onRpcError
+ * @param {((error: unknown) => void)} [onRpcError]
  */
 export const makeAgoricWalletConnection = async (
   chainStorageWatcher,
diff --git a/packages/web-components/src/wallet-connection/watchWallet.js b/packages/web-components/src/wallet-connection/watchWallet.js
index 6078e58..7894649 100644
--- a/packages/web-components/src/wallet-connection/watchWallet.js
+++ b/packages/web-components/src/wallet-connection/watchWallet.js
@@ -38,7 +38,7 @@ const MAX_ATTEMPTS_TO_WATCH_BANK = 2;
  * @param {any} chainStorageWatcher
  * @param {string} address
  * @param {string} rpc
- * @param {((error: unknown) => void)=} onRpcError
+ * @param {((error: unknown) => void)} [onRpcError]
  */
 export const watchWallet = (chainStorageWatcher, address, rpc, onRpcError) => {
   const pursesNotifierKit = makeNotifierKit(
@@ -140,7 +140,10 @@ export const watchWallet = (chainStorageWatcher, address, rpc, onRpcError) => {
         } catch (e) {
           console.error('Error querying bank balances for address', address);
           if (attempts >= MAX_ATTEMPTS_TO_WATCH_BANK) {
-            onRpcError && onRpcError(e);
+            onRpcError &&
+              onRpcError(
+                new Error(`RPC error${e.toString && ` - ${e.toString()}`}`),
+              );
           } else {
             setTimeout(() => watchBank(attempts + 1), RETRY_INTERVAL_MS);
             return;
@@ -222,7 +225,10 @@ export const watchWallet = (chainStorageWatcher, address, rpc, onRpcError) => {
                 );
               } catch (e) {
                 console.error('Error getting boardAux for brands', brands, e);
-                onRpcError && onRpcError(e);
+                onRpcError &&
+                  onRpcError(
+                    new Error(`API error${e.toString && ` - ${e.toString()}`}`),
+                  );
               }
             }
 
@@ -256,7 +262,8 @@ export const watchWallet = (chainStorageWatcher, address, rpc, onRpcError) => {
     try {
       await watch();
     } catch (e) {
-      onRpcError && onRpcError(e);
+      onRpcError &&
+        onRpcError(new Error(`RPC error${e.toString && ` - ${e.toString()}`}`));
     }
   };