diff --git a/src/boundThreepids.js b/src/boundThreepids.js
new file mode 100644
index 0000000000..799728f801
--- /dev/null
+++ b/src/boundThreepids.js
@@ -0,0 +1,52 @@
+/*
+Copyright 2019 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import IdentityAuthClient from './IdentityAuthClient';
+
+export async function getThreepidBindStatus(client, filterMedium) {
+    const userId = client.getUserId();
+
+    let { threepids } = await client.getThreePids();
+    if (filterMedium) {
+        threepids = threepids.filter((a) => a.medium === filterMedium);
+    }
+
+    if (threepids.length > 0) {
+        // TODO: Handle terms agreement
+        // See https://github.com/vector-im/riot-web/issues/10522
+        const authClient = new IdentityAuthClient();
+        const identityAccessToken = await authClient.getAccessToken();
+
+        // Restructure for lookup query
+        const query = threepids.map(({ medium, address }) => [medium, address]);
+        const lookupResults = await client.bulkLookupThreePids(query, identityAccessToken);
+
+        // Record which are already bound
+        for (const [medium, address, mxid] of lookupResults.threepids) {
+            if (mxid !== userId) {
+                continue;
+            }
+            if (filterMedium && medium !== filterMedium) {
+                continue;
+            }
+            const threepid = threepids.find(e => e.medium === medium && e.address === address);
+            if (!threepid) continue;
+            threepid.bound = true;
+        }
+    }
+
+    return threepids;
+}