diff --git a/lib/actions/user-actions.js b/lib/actions/user-actions.js
--- a/lib/actions/user-actions.js
+++ b/lib/actions/user-actions.js
@@ -7,6 +7,8 @@
   LogInResult,
   RegisterResult,
   RegisterInfo,
+  SIWEServerCall,
+  SIWEResult,
   UpdateUserSettingsRequest,
 } from '../types/account-types';
 import type { GetSessionPublicKeysArgs } from '../types/request-types';
@@ -91,6 +93,31 @@
   };
 };
 
+const siweActionTypes = Object.freeze({
+  started: 'SIWE_STARTED',
+  success: 'SIWE_SUCCESS',
+  failed: 'SIWE_FAILED',
+});
+const siwe = (
+  callServerEndpoint: CallServerEndpoint,
+): ((siweInfo: SIWEServerCall) => Promise<SIWEResult>) => async siweInfo => {
+  const response = await callServerEndpoint(
+    'siwe',
+    {
+      ...siweInfo,
+      platformDetails: getConfig().platformDetails,
+    },
+    registerCallServerEndpointOptions,
+  );
+  return {
+    currentUserInfo: response.currentUserInfo,
+    rawMessageInfos: response.rawMessageInfos,
+    threadInfos: response.cookieChange.threadInfos,
+    userInfos: response.cookieChange.userInfos,
+    calendarQuery: siweInfo.calendarQuery,
+  };
+};
+
 function mergeUserInfos(...userInfoArrays: UserInfo[][]): UserInfo[] {
   const merged = {};
   for (const userInfoArray of userInfoArrays) {
@@ -238,6 +265,8 @@
   searchUsersActionTypes,
   setUserSettings,
   setUserSettingsActionTypes,
+  siwe,
+  siweActionTypes,
   updateSubscription,
   updateSubscriptionActionTypes,
 };
diff --git a/lib/types/account-types.js b/lib/types/account-types.js
--- a/lib/types/account-types.js
+++ b/lib/types/account-types.js
@@ -140,6 +140,24 @@
   +logInActionSource: LogInActionSource,
 };
 
+export type SIWERequest = {
+  +address: string,
+  +message: string,
+  +signature: string,
+};
+
+export type SIWEServerCall = {
+  ...SIWERequest,
+  ...LogInExtraInfo,
+};
+
+export type SIWEResponse = {
+  ...RegisterResponse,
+};
+
+export type SIWEResult = {
+  ...RegisterResult,
+};
 export type UpdatePasswordRequest = {
   code: string,
   password: string,
diff --git a/lib/types/endpoints.js b/lib/types/endpoints.js
--- a/lib/types/endpoints.js
+++ b/lib/types/endpoints.js
@@ -24,6 +24,7 @@
   CREATE_ACCOUNT: 'create_account',
   LOG_IN: 'log_in',
   UPDATE_PASSWORD: 'update_password',
+  SIWE: 'siwe',
 });
 type SessionChangingEndpoint = $Values<typeof sessionChangingEndpoints>;
 
diff --git a/lib/types/redux-types.js b/lib/types/redux-types.js
--- a/lib/types/redux-types.js
+++ b/lib/types/redux-types.js
@@ -7,6 +7,7 @@
   LogInResult,
   RegisterResult,
   DefaultNotificationPayload,
+  SIWEResult,
 } from './account-types';
 import type {
   ActivityUpdateSuccessPayload,
@@ -818,6 +819,22 @@
       +error: true,
       +payload: Error,
       +loadingInfo: LoadingInfo,
+    }
+  | {
+      +type: 'SIWE_STARTED',
+      +payload?: void,
+      +loadingInfo: LoadingInfo,
+    }
+  | {
+      +type: 'SIWE_SUCCESS',
+      +payload: SIWEResult,
+      +loadingInfo: LoadingInfo,
+    }
+  | {
+      +type: 'SIWE_FAILED',
+      +error: true,
+      +payload: Error,
+      +loadingInfo: LoadingInfo,
     };
 
 export type ActionPayload = ?(Object | Array<*> | $ReadOnlyArray<*> | string);
diff --git a/native/account/siwe-panel.react.js b/native/account/siwe-panel.react.js
--- a/native/account/siwe-panel.react.js
+++ b/native/account/siwe-panel.react.js
@@ -3,11 +3,11 @@
 import Animated from 'react-native-reanimated';
 import WebView from 'react-native-webview';
 
-import { registerActionTypes, register } from 'lib/actions/user-actions';
+import { siweActionTypes, siwe } from 'lib/actions/user-actions';
 import type {
-  RegisterInfo,
+  SIWEServerCall,
+  SIWEResult,
   LogInExtraInfo,
-  RegisterResult,
   LogInStartingPayload,
 } from 'lib/types/account-types';
 import {
@@ -35,23 +35,24 @@
   // Redux dispatch functions
   +dispatchActionPromise: DispatchActionPromise,
   // async functions that hit server APIs
-  +registerAction: (registerInfo: RegisterInfo) => Promise<RegisterResult>,
+  +siweAction: (siweInfo: SIWEServerCall) => Promise<SIWEResult>,
 };
 
 function SIWEPanel({
   logInExtraInfo,
   dispatchActionPromise,
-  registerAction,
+  siweAction,
 }: Props) {
   const handleSIWE = React.useCallback(
-    ({ address, signature }) => {
+    ({ address, message, signature }) => {
       // this is all mocked from register-panel
       const extraInfo = logInExtraInfo();
       dispatchActionPromise(
-        registerActionTypes,
-        registerAction({
-          username: address,
-          password: signature,
+        siweActionTypes,
+        siweAction({
+          address,
+          message,
+          signature,
           ...extraInfo,
         }),
         undefined,
@@ -59,16 +60,16 @@
       );
       setNativeCredentials({ username: address, password: signature });
     },
-    [logInExtraInfo, dispatchActionPromise, registerAction],
+    [logInExtraInfo, dispatchActionPromise, siweAction],
   );
   const handleMessage = React.useCallback(
     event => {
       const {
         nativeEvent: { data },
       } = event;
-      const { address, signature } = JSON.parse(data);
+      const { address, message, signature } = JSON.parse(data);
       if (address && signature) {
-        handleSIWE({ address, signature });
+        handleSIWE({ address, message, signature });
       }
     },
     [handleSIWE],
@@ -87,14 +88,14 @@
     );
 
     const dispatchActionPromise = useDispatchActionPromise();
-    const callRegister = useServerCall(register);
+    const callSiwe = useServerCall(siwe);
 
     return (
       <SIWEPanel
         {...props}
         logInExtraInfo={logInExtraInfo}
         dispatchActionPromise={dispatchActionPromise}
-        registerAction={callRegister}
+        siweAction={callSiwe}
       />
     );
   },