diff --git a/web/account/log-in-form.react.js b/web/account/log-in-form.react.js
--- a/web/account/log-in-form.react.js
+++ b/web/account/log-in-form.react.js
@@ -23,6 +23,10 @@
 import { alchemyProvider } from 'wagmi/providers/alchemy';
 import { publicProvider } from 'wagmi/providers/public';
 
+import {
+  getSIWENonce,
+  getSIWENonceActionTypes,
+} from 'lib/actions/siwe-actions.js';
 import { logInActionTypes, logIn } from 'lib/actions/user-actions';
 import { useModalContext } from 'lib/components/modal-provider.react';
 import { createLoadingStatusSelector } from 'lib/selectors/loading-selectors';
@@ -69,6 +73,9 @@
   provider,
 });
 
+const getSIWENonceLoadingStatusSelector = createLoadingStatusSelector(
+  getSIWENonceActionTypes,
+);
 const loadingStatusSelector = createLoadingStatusSelector(logInActionTypes);
 function LoginForm(): React.Node {
   const { openConnectModal } = useConnectModal();
@@ -76,12 +83,19 @@
   const inputDisabled = useSelector(loadingStatusSelector) === 'loading';
   const loginExtraInfo = useSelector(webLogInExtraInfoSelector);
   const callLogIn = useServerCall(logIn);
+
+  const getSIWENonceCall = useServerCall(getSIWENonce);
+  const getSIWENonceCallLoadingStatus = useSelector(
+    getSIWENonceLoadingStatusSelector,
+  );
+
   const dispatchActionPromise = useDispatchActionPromise();
   const modalContext = useModalContext();
 
   const [username, setUsername] = React.useState<string>('');
   const [password, setPassword] = React.useState<string>('');
   const [errorMessage, setErrorMessage] = React.useState<string>('');
+  const [siweNonce, setSIWENonce] = React.useState<?string>(null);
 
   const usernameInputRef = React.useRef();
 
@@ -89,6 +103,20 @@
     usernameInputRef.current?.focus();
   }, []);
 
+  React.useEffect(() => {
+    if (!signer || !isDev) {
+      setSIWENonce(null);
+      return;
+    }
+    dispatchActionPromise(
+      getSIWENonceActionTypes,
+      (async () => {
+        const response = await getSIWENonceCall();
+        setSIWENonce(response);
+      })(),
+    );
+  }, [dispatchActionPromise, getSIWENonceCall, signer]);
+
   const onUsernameChange = React.useCallback(e => {
     invariant(e.target instanceof HTMLInputElement, 'target not input');
     setUsername(e.target.value);
@@ -174,7 +202,16 @@
   }
 
   let siweConnectButton;
-  if (isDev && signer) {
+  if (isDev && signer && !siweNonce) {
+    siweConnectButton = (
+      <div className={css.connectButtonContainer}>
+        <LoadingIndicator
+          status={getSIWENonceCallLoadingStatus}
+          size="medium"
+        />
+      </div>
+    );
+  } else if (isDev && signer) {
     siweConnectButton = (
       <div className={css.connectButtonContainer}>
         <ConnectButton />