diff --git a/keyserver/src/utils/farcaster-utils.js b/keyserver/src/utils/farcaster-utils.js
new file mode 100644
--- /dev/null
+++ b/keyserver/src/utils/farcaster-utils.js
@@ -0,0 +1,26 @@
+//  @flow
+
+import { getRustAPI } from 'rust-node-addon';
+
+import { verifyUserIDs } from '../fetchers/user-fetchers.js';
+
+async function getVerifiedUserIDForFID(fid: string): Promise<?string> {
+  const rustAPI = await getRustAPI();
+  const farcasterUsers = await rustAPI.getFarcasterUsers([fid]);
+
+  const validUserIDs = await verifyUserIDs(
+    farcasterUsers.map(user => user.userID),
+  );
+
+  const validFarcasterUsers = farcasterUsers.filter(user =>
+    validUserIDs.includes(user.userID),
+  );
+
+  if (validFarcasterUsers.length === 0) {
+    return null;
+  }
+
+  return validFarcasterUsers[0].userID;
+}
+
+export { getVerifiedUserIDForFID };