diff --git a/env/test/resources/config.edn b/env/test/resources/config.edn
index 6e65a3d..4c40fb3 100644
--- a/env/test/resources/config.edn
+++ b/env/test/resources/config.edn
@@ -1,4 +1,4 @@
 {
  :test              true
- :jdbc-database-url "jdbc:postgresql://localhost/commiteth_test?user=commiteth&password=commiteth"
+ :jdbc-database-url "jdbc:postgresql://localhost/commiteth?user=commiteth&password=commiteth"
 }
diff --git a/src/clj/commiteth/routes/services.clj b/src/clj/commiteth/routes/services.clj
index 5d31eaf..48a7b9b 100644
--- a/src/clj/commiteth/routes/services.clj
+++ b/src/clj/commiteth/routes/services.clj
@@ -9,6 +9,7 @@
             [commiteth.db.repositories :as repositories]
             [commiteth.db.bounties :as bounties-db]
             [commiteth.bounties :as bounties]
+            [commiteth.eth.core :as eth]
             [commiteth.github.core :as github]
             [clojure.tools.logging :as log]
             [commiteth.eth.core :as eth]
@@ -97,11 +98,9 @@
                            :description "commitETH API"}}}}
 
   (context "/api" []
-
            (context "/bounties" []
                     (GET "/all" []
                          (ok (bounties-db/list-all-bounties))))
-
            (context "/user" []
                     (GET "/" []
                          :auth-rules authenticated?
@@ -111,10 +110,15 @@
                           :auth-rules authenticated?
                           :body-params [user-id :- Long, address :- String]
                           :summary "Update user address"
-                          (let [result (users/update-user-address user-id address)]
-                            (if (= 1 result)
-                              (ok)
-                              (internal-server-error))))
+                          (if-not (eth/valid-address? address)
+                            {:status 400
+                             :body "Invalid Ethereum address"}
+                            (let [result (users/update-user-address
+                                          user-id
+                                          address)]
+                              (if (= 1 result)
+                                (ok)
+                                (internal-server-error)))))
                     (GET "/repositories" []
                          :auth-rules authenticated?
                          :current-user user
@@ -138,8 +142,7 @@
                          :auth-rules authenticated?
                          :current-user user
                          (ok (map #(conj % (let [balance (:balance %)]
-                                             {:balance-eth (eth/hex->eth balance 6)
-                                              :balance-wei (eth/hex->big-integer balance)}))
+                                             {:balance-eth (eth/hex->eth balance 6)}))
                                   (bounties-db/list-owner-bounties (:id user)))))
                     (POST "/repository/toggle" {:keys [params]}
                           :auth-rules authenticated?
diff --git a/src/cljs/commiteth/common.cljs b/src/cljs/commiteth/common.cljs
index 39c6d1a..08d5792 100644
--- a/src/cljs/commiteth/common.cljs
+++ b/src/cljs/commiteth/common.cljs
@@ -9,12 +9,13 @@
                    :value     @val-ratom
                    :on-change #(reset! val-ratom (-> % .-target .-value))})]))
 
-(defn dropdown [title val-ratom items]
+(defn dropdown [props title val-ratom items]
   (fn []
     (if (= 1 (count items))
       (reset! val-ratom (first items)))
     [:select.ui.basic.selection.dropdown
-     {:on-change #(reset! val-ratom (-> % .-target .-value))}
+     (merge props {:on-change
+                   #(reset! val-ratom (-> % .-target .-value))})
      (doall (for [item items]
               ^{:key item} [:option
                             {:value item}
diff --git a/src/cljs/commiteth/core.cljs b/src/cljs/commiteth/core.cljs
index 7407dc2..5afffc6 100644
--- a/src/cljs/commiteth/core.cljs
+++ b/src/cljs/commiteth/core.cljs
@@ -22,6 +22,16 @@
             [re-frisk.core :refer [enable-re-frisk!]])
   (:import goog.History))
 
+
+(defn flash-message-pane []
+  (let [flash-message (rf/subscribe [:flash-message])]
+    (fn []
+      (when-let [[type message] @flash-message]
+          [:div.flash-message {:class (name type)}
+           [:i.close.icon {:on-click #(rf/dispatch [:clear-flash-message])}]
+           [:p message]]))
+    ))
+
 (def user-dropdown-open? (r/atom false))
 
 (defn user-dropdown [user items]
@@ -38,12 +48,13 @@
      [:div.item
       [:span.dropdown.icon]]
      (into menu
-           (for [[target caption] items]
+           (for [[target caption props] items]
              ^{:key target} [:div.item
                              [:a
-                              (if (keyword? target)
-                                {:on-click #(rf/dispatch [target])}
-                                {:href target})
+                              (merge props
+                                     (if (keyword? target)
+                                       {:on-click #(rf/dispatch [target])}
+                                       {:href target}))
                               caption]]))]))
 
 
@@ -53,8 +64,8 @@
       (if @user
         [:div.ui.text.menu.user-component
          [:div.item
-          [user-dropdown @user [[:update-address "Update address"]
-                                ["/logout" "Sign out"]]]]]
+          [user-dropdown @user [[:update-address "Update address" {}]
+                                ["/logout" "Sign out" {:class "logout-link"}]]]]]
         [:a.ui.button.small {:href js/authorizeUrl} "Sign in"]))))
 
 (defn tabs []
@@ -74,7 +85,8 @@
 
 
 (defn page-header []
-  (let [user (rf/subscribe [:user])]
+  (let [user (rf/subscribe [:user])
+        flash-message (rf/subscribe [:flash-message])]
     (fn []
       [:div.vertical.segment.commiteth-header
        [:div.ui.grid.container
@@ -82,7 +94,9 @@
          [:div.ui.image
           [:img.left.aligned {:src "/img/logo.svg"}]]]
         [:div.four.wide.column
-         [user-component @user]]
+         (if @flash-message
+           [flash-message-pane]
+           [user-component @user])]
         (when-not @user
           [:div.ui.text.content
            [:div.ui.divider.hidden]
@@ -117,7 +131,6 @@
   (fn []
     [:div.ui.pusher
      [page-header]
-     ;;     [error-pane]
      [:div.ui.vertical.segment
       [:div.ui.container
        [:div.ui.grid.stackable
diff --git a/src/cljs/commiteth/handlers.cljs b/src/cljs/commiteth/handlers.cljs
index c5ceeda..e10d89d 100644
--- a/src/cljs/commiteth/handlers.cljs
+++ b/src/cljs/commiteth/handlers.cljs
@@ -25,14 +25,14 @@
    (assoc-in db path value)))
 
 (reg-event-db
- :set-error
- (fn [db [_ text]]
-   (assoc db :error text)))
+ :set-flash-message
+ (fn [db [_ type text]]
+   (assoc db :flash-message [type text])))
 
 (reg-event-db
- :clear-error
+ :clear-flash-message
  (fn [db _]
-   (dissoc db :error)))
+   (dissoc db :flash-message)))
 
 (reg-event-db
  :set-active-page
@@ -181,9 +181,21 @@
  :save-user-address
  (fn [{:keys [db]} [_ user-id address]]
    (prn "save-user-address" user-id address)
-   {:db   db
+   {:db   (assoc db :updating-address true)
     :http {:method     POST
            :url        "/api/user/address"
-           :on-success #(println "on-success" %)
-           :on-error   #(println "on-error" %)
+           :on-success #(do
+                          (dispatch [:assoc-in [:user [:address] address]])
+                          (dispatch [:set-flash-message
+                                     :success
+                                     "Address saved"]))
+           :on-error   #(dispatch [:set-flash-message
+                                   :error
+                                   (:response %)])
+           :finally    #(dispatch [:clear-updating-address])
            :params     {:user-id user-id :address address}}}))
+
+(reg-event-db
+ :clear-updating-address
+ (fn [db _]
+   (dissoc db :updating-address)))
diff --git a/src/cljs/commiteth/subscriptions.cljs b/src/cljs/commiteth/subscriptions.cljs
index 53f006d..eb10d9b 100644
--- a/src/cljs/commiteth/subscriptions.cljs
+++ b/src/cljs/commiteth/subscriptions.cljs
@@ -22,9 +22,9 @@
     (:repos db)))
 
 (reg-sub
-  :error
+  :flash-message
   (fn [db _]
-    (:error db)))
+    (:flash-message db)))
 
 (reg-sub
   :all-bounties
diff --git a/src/cljs/commiteth/update_address.cljs b/src/cljs/commiteth/update_address.cljs
index 5b4b100..a6183ad 100644
--- a/src/cljs/commiteth/update_address.cljs
+++ b/src/cljs/commiteth/update_address.cljs
@@ -7,6 +7,7 @@
 
 (defn update-address-page []
   (let [user (rf/subscribe [:user])
+        updating-address (rf/subscribe [:get-in [:updating-address]])
         web3 (.-web3 js/window)
         web3-accounts (into [] (when-not (nil? web3) (-> web3
                                                          .-eth
@@ -21,7 +22,7 @@
         [:p "Placeholder text for explaining what an Ethereum address is."]
         [:div.field
          (if-not (empty? web3-accounts)
-           [dropdown "Select address"
+           [dropdown {:class "address-input"} "Select address"
             address
             (into []
                   (for [acc web3-accounts]
@@ -29,9 +30,13 @@
            [:div.ui.input.address-input
             [input address {:placeholder  "0x0000000000000000000000000000000000000000"
                             :auto-complete "off"
+                            :auto-correct "off"
+                            :spell-check "false"
                             :max-length 42}]])]
-        [:button.ui.button {:on-click
-                            #(rf/dispatch [:save-user-address
-                                           (:id @user)
-                                           @address])}
+        [:button.ui.button (merge {:on-click
+                                   #(rf/dispatch [:save-user-address
+                                                  (:id @user)
+                                                  @address])}
+                                  (when @updating-address
+                                    {:class "busy loading"}))
          "Update"]]])))
diff --git a/src/less/style.less b/src/less/style.less
index 670d4f5..e33d866 100644
--- a/src/less/style.less
+++ b/src/less/style.less
@@ -13,9 +13,16 @@
 
 
 .ui.button {
+    color: #2f3f44;
     background-color: #b0f1ee;
     white-space: nowrap;
     padding: 0.9em 1.2em 0.9em;
+    &:hover {
+        background-color: #bdf8f5;
+    }
+    &:active,&:focus {
+        background-color: #97ebe7;
+    }
 }
 .ui.small.button {
     font-size: 15px!important;
@@ -87,7 +94,6 @@ span.dropdown.icon {
 .ui.dropdown .item {
     color: #fff!important;
     opacity: 0.98;
-
 }
 
 .ui.menu .ui.dropdown .menu>.item:hover, .ui.menu .ui.dropdown .menu>.selected.item {
@@ -95,30 +101,33 @@ span.dropdown.icon {
 }
 
 .ui.input.address-input {
+    color: #e7e7e7!important;
     font-size: .8em;
     width: 360px!important;
 }
 
-
+.ui.selection.dropdown.address-input option {
+    color: #e7e7e7;
+    background-color: yellow!important;
+}
 .ui.menu.transition.visible {
     font-family: 'postgrotesk';
     font-size: 1em;
     border-radius: 8px;
     border: none;
     padding: .5em;
-    .item  {
-        :hover {
-            color: #e96868;
-        }
-        a {
-            &:hover {
-                color: #e96868;
-            }
-            color: #474951;
+    .item>a {
+        &:hover {
+            color:#1bb5c1;
         }
+        color: #474951;
     }
 }
 
+.logout-link {
+    color: #e96868!important;
+}
+
 .ui.attached.tabular {
     background-color: #2f3f44;
     border-bottom: none;
@@ -189,9 +198,6 @@ span.dropdown.icon {
     padding: 0.8em 1em 1.1em!important;
 
     flex-direction: row!important;
-    // .ui.mini.circular.image {
-    //     margin: 0;
-    // }
 }
 
 .ui.cards>.card  {
@@ -229,6 +235,28 @@ span.dropdown.icon {
     color: #a8aab1;
 }
 
+.flash-message {
+    &.success {
+        background-color: #61deb0;
+    }
+    &.error {
+        background-color: #e96868;
+    }
+
+    color: #fff;
+    border-radius: 8px;
+    z-index: 100;
+    padding: 1.4em 1em 1.4em;
+    i {
+        position: absolute;
+        margin: 0;
+        right: 1.5em;
+        top: 1.5em;
+        cursor: pointer;
+    }
+}
+
+
 .ui {
     font-family: 'postgrotesk'!important;
 }
diff --git a/test/clj/commiteth/test/db/core.clj b/test/clj/commiteth/test/db/core.clj
index 4775e95..a356d1b 100644
--- a/test/clj/commiteth/test/db/core.clj
+++ b/test/clj/commiteth/test/db/core.clj
@@ -24,6 +24,7 @@
                     {:id      1
                      :login   "torvalds"
                      :name    "Linus Torvalds"
+                     :avatar_url ""
                      :email   nil
                      :token   "not null"
                      :address "address"
@@ -32,6 +33,7 @@
             :login   "torvalds"
             :name    "Linus Torvalds"
             :email   nil
+            :avatar_url ""
             :token   "not null"
             :address "address"
             :created nil}