diff --git a/controllers/send-widget.controller.es6 b/controllers/send-widget.controller.es6
index 8476ce9..02db342 100644
--- a/controllers/send-widget.controller.es6
+++ b/controllers/send-widget.controller.es6
@@ -5,6 +5,7 @@ import {Alert, AlertGroup} from 'interstellar-ui-messages';
 import {Account, Asset, Keypair, Memo, Operation, Transaction, TransactionBuilder, xdr} from 'stellar-sdk';
 import {FederationServer} from 'stellar-sdk';
 import BasicClientError from '../errors';
+import knownAccounts from '../known_accounts';
 import StellarLedger from 'stellar-ledger-api';
 
 @Widget('send', 'SendWidgetController', 'interstellar-basic-client/send-widget')
@@ -64,11 +65,17 @@ export default class SendWidgetController {
     });
     Alerts.registerGroup(this.amountAlertGroup);
 
-    this.memoAlertGroup = new AlertGroup();
-    this.memoAlertGroup.registerUpdateListener(alerts => {
-      this.memoAlerts = alerts;
+    this.memoErrorAlertGroup = new AlertGroup();
+    this.memoErrorAlertGroup.registerUpdateListener(alerts => {
+      this.memoErrorAlerts = alerts;
     });
-    Alerts.registerGroup(this.memoAlertGroup);
+    Alerts.registerGroup(this.memoErrorAlertGroup);
+
+    this.memoWarningAlertGroup = new AlertGroup();
+    this.memoWarningAlertGroup.registerUpdateListener(alerts => {
+      this.memoWarningAlerts = alerts;
+    });
+    Alerts.registerGroup(this.memoWarningAlertGroup);
 
     this.useLedger = this.session.data && this.session.data['useLedger'];
     this.bip32Path = this.session.data && this.session.data['bip32Path'];
@@ -77,6 +84,7 @@ export default class SendWidgetController {
   loadDestination($event) {
     this.loadingDestination = true;
     this.addressAlertGroup.clear();
+    this.memoWarningAlertGroup.clear();
 
     let resetState = () => {
       this.destination = null;
@@ -123,8 +131,18 @@ export default class SendWidgetController {
           this.memoBlocked = true;
         } else {
           this.memoBlocked = false;
-          
         }
+
+        if (this.destination in knownAccounts && knownAccounts[this.destination].requiredMemoType) {
+          this.memo = true;
+          this.memoType = knownAccounts[this.destination].requiredMemoType;
+          let alert = new Alert({
+            text: 'The payment destination (' + knownAccounts[this.destination].name +') requires you to specify a memo to identify your account.',
+            type: Alert.TYPES.WARNING
+          });
+          this.memoWarningAlertGroup.show(alert);
+        }
+
         this.loadingDestination = false;
         this.$scope.$apply();
       })
@@ -160,7 +178,7 @@ export default class SendWidgetController {
     if ($event) {
       $event.preventDefault();
     }
-    this.memoAlertGroup.clear();
+    this.memoErrorAlertGroup.clear();
     this.memo = false;
     this.memoType = null;
     this.memoValue = null;
@@ -183,7 +201,7 @@ export default class SendWidgetController {
 
     this.addressAlertGroup.clear();
     this.amountAlertGroup.clear();
-    this.memoAlertGroup.clear();
+    this.memoErrorAlertGroup.clear();
 
     if (!Account.isValidAccountId(this.destination)) {
       let alert = new Alert({
@@ -231,11 +249,11 @@ export default class SendWidgetController {
           text: memoError,
           type: Alert.TYPES.ERROR
         });
-        this.memoAlertGroup.show(alert);
+        this.memoErrorAlertGroup.show(alert);
       }
     }
 
-    if (this.addressAlerts.length || this.amountAlerts.length || this.memoAlerts.length) {
+    if (this.addressAlerts.length || this.amountAlerts.length || this.memoErrorAlerts.length) {
       this.sending = false;
       return;
     }
@@ -415,7 +433,10 @@ export default class SendWidgetController {
     this.destination = null;
     this.amount = null;
     this.memo = false;
+    this.memoType = null;
+    this.memoValue = null;
     this.lastTransactionXDR = null;
+    this.memoWarningAlertGroup.clear();
     this.$rootScope.$broadcast('account-viewer.transaction-success');
   }
 
diff --git a/known_accounts.es6 b/known_accounts.es6
new file mode 100644
index 0000000..f5b88c2
--- /dev/null
+++ b/known_accounts.es6
@@ -0,0 +1,27 @@
+const knownAccounts = {
+  'GCGNWKCJ3KHRLPM3TM6N7D3W5YKDJFL6A2YCXFXNMRTZ4Q66MEMZ6FI2': {
+    name: 'Poloniex',
+    requiredMemoType: 'MEMO_ID'
+  },
+  'GA5XIGA5C7QTPTWXQHY6MCJRMTRZDOSHR6EFIBNDQTCQHG262N4GGKTM': {
+    name: 'Kraken',
+    requiredMemoType: 'MEMO_ID'
+  },
+  'GB6YPGW5JFMMP2QB2USQ33EUWTXVL4ZT5ITUNCY3YKVWOJPP57CANOF3': {
+    name: 'Bittrex',
+    requiredMemoType: 'MEMO_TEXT'
+  },
+  'GB7GRJ5DTE3AA2TCVHQS2LAD3D7NFG7YLTOEWEBVRNUUI2Q3TJ5UQIFM': {
+    name: 'BTC38',
+    requiredMemoType: 'MEMO_ID'
+  },
+  'GBV4ZDEPNQ2FKSPKGJP2YKDAIZWQ2XKRQD4V4ACH3TCTFY6KPY3OAVS7': {
+    name: 'Changelly',
+    requiredMemoType: 'MEMO_ID'
+  },
+  'GC4KAS6W2YCGJGLP633A6F6AKTCV4WSLMTMIQRSEQE5QRRVKSX7THV6S': {
+    name: 'BitcoinIndonesia',
+    requiredMemoType: 'MEMO_TEXT'
+  }
+};
+export default knownAccounts;
diff --git a/templates/send-widget.template.html b/templates/send-widget.template.html
index db97add..e304000 100644
--- a/templates/send-widget.template.html
+++ b/templates/send-widget.template.html
@@ -65,7 +65,7 @@ <h2 class="sendPane__title">Send lumens</h2>
           <input ng-model="widget.memoValue"
             ng-disabled="widget.memoBlocked"
             class="sendSetup__memo__memoSetup__input"
-            ng-class="{'s-inputAlert--alert': widget.memoAlerts.length > 0, 'is-disabled': widget.memoBlocked}"
+            ng-class="{'s-inputAlert--alert': widget.memoErrorAlerts.length > 0, 'is-disabled': widget.memoBlocked}"
             placeholder="{{widget.memoPlaceholder}}" type="text" />
         </div>
       </div>
@@ -75,8 +75,13 @@ <h2 class="sendPane__title">Send lumens</h2>
         <strong>Note</strong>: The specified federation address requires this transaction's memo to be a certain value.
       </span>
     </div>
-    <div class="s-alert s-alert--alert sendSetup__error" ng-if="widget.memoAlerts.length > 0">
-      <span ng-repeat="alert in widget.memoAlerts">
+    <div class="s-alert s-alert--alert sendSetup__error" ng-if="widget.memoErrorAlerts.length > 0">
+      <span ng-repeat="alert in widget.memoErrorAlerts">
+        {{alert.title}} {{alert.text}}
+      </span>
+    </div>
+    <div class="s-alert s-alert--warning sendSetup__error" ng-if="widget.memoWarningAlerts.length > 0">
+      <span ng-repeat="alert in widget.memoWarningAlerts">
         {{alert.title}} {{alert.text}}
       </span>
     </div>
@@ -105,6 +110,12 @@ <h2 class="sendPane__title">Send lumens</h2>
         <span class="sendConfirm__sendingContainer__amount__info">{{widget.memoValue}}</span>
       </div>
     </div>
+    <div class="s-alert s-alert--warning" ng-if="!widget.memo && widget.memoWarningAlerts.length > 0">
+      <span ng-repeat="alert in widget.memoWarningAlerts">
+        {{alert.title}} {{alert.text}}
+      </span>
+    </div>
+
 
     <button class="s-button sendConfirm__submit" ng-click="widget.confirm()">Submit transaction</button>