diff --git a/libs/wallet/src/connect-dialog/use-chain-id.spec.ts b/libs/wallet/src/connect-dialog/use-chain-id.spec.ts
new file mode 100644
index 000000000..1e5263879
--- /dev/null
+++ b/libs/wallet/src/connect-dialog/use-chain-id.spec.ts
@@ -0,0 +1,72 @@
+import { renderHook, waitFor } from '@testing-library/react';
+import { useVegaWallet } from '../use-vega-wallet';
+import { useChainId } from './use-chain-id';
+
+global.fetch = jest.fn();
+const mockFetch = global.fetch as jest.Mock;
+mockFetch.mockImplementation((url: string) => {
+  return Promise.resolve({ ok: true });
+});
+
+jest.mock('../use-vega-wallet', () => {
+  const original = jest.requireActual('../use-vega-wallet');
+  return {
+    ...original,
+    useVegaWallet: jest.fn(),
+  };
+});
+
+describe('useChainId', () => {
+  it('does not call fetch when statistics url could not be determined', async () => {
+    (useVegaWallet as jest.Mock).mockReturnValue({
+      vegaUrl: '',
+    });
+    renderHook(() => useChainId());
+    await waitFor(() => {
+      expect(mockFetch).toHaveBeenCalledTimes(0);
+    });
+  });
+
+  it('calls fetch with correct statistics url', async () => {
+    (useVegaWallet as jest.Mock).mockReturnValue({
+      vegaUrl: 'http://localhost:1234/graphql',
+    });
+    renderHook(() => useChainId());
+    await waitFor(() => {
+      expect(mockFetch).toHaveBeenCalledWith(
+        'http://localhost:1234/statistics'
+      );
+    });
+  });
+
+  it('does not return chain id when chain id is not present in response', async () => {
+    (useVegaWallet as jest.Mock).mockReturnValue({
+      vegaUrl: 'http://localhost:1234/graphql',
+    });
+    const { result } = renderHook(() => useChainId());
+    await waitFor(() => {
+      expect(result.current).toBeUndefined();
+    });
+  });
+
+  it('returns chain id when chain id is present in response', async () => {
+    (useVegaWallet as jest.Mock).mockReturnValue({
+      vegaUrl: 'http://localhost:1234/graphql',
+    });
+    mockFetch.mockImplementation(() => {
+      return Promise.resolve({
+        ok: true,
+        json: () => ({
+          statistics: {
+            chainId: '1234',
+          },
+        }),
+      });
+    });
+    const { result } = renderHook(() => useChainId());
+    await waitFor(() => {
+      expect(result.current).not.toBeUndefined();
+      expect(result.current).toEqual('1234');
+    });
+  });
+});
diff --git a/libs/wallet/src/connect-dialog/use-chain-id.ts b/libs/wallet/src/connect-dialog/use-chain-id.ts
index d346bd2b9..559ed628d 100644
--- a/libs/wallet/src/connect-dialog/use-chain-id.ts
+++ b/libs/wallet/src/connect-dialog/use-chain-id.ts
@@ -3,17 +3,37 @@ import { useVegaWallet } from '../use-vega-wallet';
 
 const cache: Record<string, string> = {};
 
+/**
+ * Gets the statistics url for a given vega url.
+ * Example:
+ * https://graphql.example.com/graphql -> https://graphql.example.com/statistics
+ */
+const getNodeStatisticsUrl = (vegaUrl: string) => {
+  try {
+    const url = new URL(vegaUrl);
+    url.pathname = 'statistics';
+    return url.toString();
+  } catch (err) {
+    return undefined;
+  }
+};
+
 export const useChainId = () => {
   const { vegaUrl } = useVegaWallet();
   const [chainId, setChainId] = useState<undefined | string>(cache[vegaUrl]);
   const [fetchAttempt, setFetchAttempt] = useState(1);
+
+  const statisticsUrl = getNodeStatisticsUrl(vegaUrl);
+
   useEffect(() => {
+    // abort when `/statistics` URL could not be determined
+    if (!statisticsUrl) return;
     let isCancelled = false;
     if (cache[vegaUrl]) {
       setChainId(cache[vegaUrl]);
       return;
     }
-    fetch(vegaUrl.replace('graphql', 'statistics'))
+    fetch(statisticsUrl)
       .then((response) => response.json())
       .then((response) => {
         if (isCancelled) {
@@ -32,6 +52,6 @@ export const useChainId = () => {
     return () => {
       isCancelled = true;
     };
-  }, [fetchAttempt, vegaUrl]);
+  }, [fetchAttempt, statisticsUrl, vegaUrl]);
   return chainId;
 };