diff --git a/src/config/router.js b/src/config/router.js
index fee4e3a..2701a77 100644
--- a/src/config/router.js
+++ b/src/config/router.js
@@ -10,12 +10,14 @@ function router(app) {
   // Auth Endpoints
   app.get('/auth/twitter/token', AuthHandlers.getTwitterToken );
   app.get('/auth/twitter/username', AuthHandlers.getTwitterUsername );
+  app.get('/auth/session/:sessionId/exists', AuthHandlers.doesSessionExist);
   app.get('/auth/email/:email/exists', AuthHandlers.doesAttributeExist );
   app.get('/auth/tagferId/:tagferId/exists', AuthHandlers.doesAttributeExist );
   app.post('/auth/phone/code', AuthHandlers.sendPhoneCode);
   app.post('/auth/phone/verify', AuthHandlers.verifyPhoneCode);
   app.post('/auth/signin', AuthHandlers.signin);
   app.put('/auth/signup', AuthHandlers.signup);
+  app.post('/auth/signout', AuthHandlers.signout);
   app.post('/auth/passwordReset', AuthHandlers.sendPasswordResetEmail);
 
   // Users Endpoints
diff --git a/src/ups/auth/dao.js b/src/ups/auth/dao.js
index ce86a29..127af32 100644
--- a/src/ups/auth/dao.js
+++ b/src/ups/auth/dao.js
@@ -114,7 +114,7 @@ function createNewSessionId(tagferId) {
  */
 function getSession(id) {
   const sessions = loki.getCollection('sessions');
-  var session = sessions.by('id', id);
+  const session = sessions.by('id', id);
   if (session) {
     return session;
   } else {
@@ -122,6 +122,16 @@ function getSession(id) {
   }
 }
 
+/**
+ * Removes the loki session containing the tagferId on the server
+ * @param {String} id 
+ */
+function deleteSession(id) {
+  const sessions = loki.getCollection('sessions');
+  const session = getSession(id);
+  sessions.remove(session);
+}
+
 /**
  * Create new verification code for the phone number
  */
@@ -183,6 +193,7 @@ module.exports = {
   createNewUser,
   createNewSessionId,
   getSession,
+  deleteSession,
   resetPassword
 };
 
diff --git a/src/ups/auth/handlers.js b/src/ups/auth/handlers.js
index 1de5593..d1c7bc6 100644
--- a/src/ups/auth/handlers.js
+++ b/src/ups/auth/handlers.js
@@ -23,6 +23,27 @@ function doesAttributeExist(req, res) {
   promise.then((result) => res.json({ result }) ).catch(error => res.json(error));
 }
 
+/**
+ * Endpoint: auth/session/:sessionId/exists
+ * Checks if a user session exists.
+ * Brute force session id attack safe by app secret.
+ * @param {Object} req {}
+ * @param {Object} res { result: Boolean }
+ */
+function doesSessionExist(req, res) {
+  const { sessionId } = req.params;
+  if (!utils.isAppSecretValid(req,res)) {
+    return;
+  }
+
+  try {
+    authDao.getSession(sessionId);
+    res.json({ result: true});
+  } catch(error) {
+    res.json({ result: false });
+  }
+}
+
 /**
  * Handles the request/response for auth/phone/code. Uses the data layer to generate a unique code,
  * if the phone number is not in our system.
@@ -90,6 +111,23 @@ function signin(req, res) {
   });
 }
 
+/**
+ * Endpoint: auth/signout
+ * Signs out by deleting his session
+ * @param {Object} req {}
+ * @param {Object} res { error: String } | {}
+ */
+function signout(req, res) {
+  const sessionId = utils.getSessionIdFromAuthHeader(req);
+
+  try {
+    authDao.deleteSession(sessionId);
+    res.json({});
+  } catch(error) {
+    res.json({ error });
+  }
+}
+
 /**
  * Endpoint: auth/signup
  * Signs up the user by creating a new user in firebase admin.
@@ -161,10 +199,12 @@ function getTwitterUsername(req, res) {
 
 module.exports = {
   doesAttributeExist,
+  doesSessionExist,
   sendPhoneCode,
   verifyPhoneCode,
   signin,
   signup,
+  signout,
   sendPasswordResetEmail,
   getTwitterToken,
   getTwitterUsername