diff --git a/keyserver/src/endpoints.js b/keyserver/src/endpoints.js
--- a/keyserver/src/endpoints.js
+++ b/keyserver/src/endpoints.js
@@ -32,6 +32,7 @@
   errorReportFetchInfosResponder,
 } from './responders/report-responders';
 import { userSearchResponder } from './responders/search-responders';
+import { siweNonceResponder } from './responders/siwe-nonce-responders';
 import {
   threadDeletionResponder,
   roleUpdateResponder,
@@ -224,6 +225,10 @@
     responder: codeVerificationResponder,
     requiredPolicies: baseLegalPolicies,
   },
+  siwe_nonce: {
+    responder: siweNonceResponder,
+    requiredPolicies: [],
+  },
 };
 
 export { jsonEndpoints };
diff --git a/keyserver/src/responders/siwe-nonce-responders.js b/keyserver/src/responders/siwe-nonce-responders.js
new file mode 100644
--- /dev/null
+++ b/keyserver/src/responders/siwe-nonce-responders.js
@@ -0,0 +1,7 @@
+// @flow
+
+async function siweNonceResponder(): Promise<string> {
+  return 'UNIMPLEMENTED';
+}
+
+export { siweNonceResponder };
diff --git a/lib/actions/siwe-actions.js b/lib/actions/siwe-actions.js
new file mode 100644
--- /dev/null
+++ b/lib/actions/siwe-actions.js
@@ -0,0 +1,17 @@
+// @flow
+
+import type { CallServerEndpoint } from '../utils/call-server-endpoint';
+
+const getSIWENonceActionTypes = Object.freeze({
+  started: 'GET_SIWE_NONCE_STARTED',
+  success: 'GET_SIWE_NONCE_SUCCESS',
+  failed: 'GET_SIWE_NONCE_FAILED',
+});
+const getSIWENonce = (
+  callServerEndpoint: CallServerEndpoint,
+): (() => Promise<string>) => async () => {
+  const nonce = await callServerEndpoint('siwe_nonce');
+  return nonce;
+};
+
+export { getSIWENonceActionTypes, getSIWENonce };
diff --git a/lib/types/endpoints.js b/lib/types/endpoints.js
--- a/lib/types/endpoints.js
+++ b/lib/types/endpoints.js
@@ -79,6 +79,7 @@
   UPDATE_THREAD: 'update_thread',
   UPDATE_USER_SUBSCRIPTION: 'update_user_subscription',
   VERIFY_CODE: 'verify_code',
+  SIWE_NONCE: 'siwe_nonce',
 });
 type SocketPreferredEndpoint = $Values<typeof socketPreferredEndpoints>;