diff --git a/lib/types/identity-service-types.js b/lib/types/identity-service-types.js
--- a/lib/types/identity-service-types.js
+++ b/lib/types/identity-service-types.js
@@ -89,6 +89,23 @@
   +walletAddress?: ?string,
 };
 
+type FarcasterUser = {
+  +userID: string,
+  +username: string,
+  +farcasterID: string,
+};
+
+export const farcasterUserValidator: TInterface<FarcasterUser> =
+  tShape<FarcasterUser>({
+    userID: t.String,
+    username: t.String,
+    farcasterID: t.String,
+  });
+
+export const farcasterUsersValidator: TList<Array<FarcasterUser>> = t.list(
+  farcasterUserValidator,
+);
+
 export const userDeviceOlmInboundKeysValidator: TInterface<UserDevicesOlmInboundKeys> =
   tShape<UserDevicesOlmInboundKeys>({
     keys: t.dict(t.String, t.maybe(deviceOlmInboundKeysValidator)),
@@ -140,6 +157,10 @@
     userID: string,
     nonceChallengeResponse: SignedMessage,
   ) => Promise<IdentityAuthResult>;
+  // getFarcasterUsers is only implemented on native at the moment
+  +getFarcasterUsers?: (
+    farcasterIDs: $ReadOnlyArray<string>,
+  ) => Promise<$ReadOnlyArray<FarcasterUser>>;
 }
 
 export type IdentityServiceAuthLayer = {
diff --git a/native/identity-service/identity-service-context-provider.react.js b/native/identity-service/identity-service-context-provider.react.js
--- a/native/identity-service/identity-service-context-provider.react.js
+++ b/native/identity-service/identity-service-context-provider.react.js
@@ -24,6 +24,7 @@
   type UserDevicesOlmInboundKeys,
   deviceOlmInboundKeysValidator,
   userDeviceOlmInboundKeysValidator,
+  farcasterUsersValidator,
 } from 'lib/types/identity-service-types.js';
 import { getContentSigningKey } from 'lib/utils/crypto-utils.js';
 import { assertWithValidator } from 'lib/utils/validation-utils.js';
@@ -533,6 +534,12 @@
           payload,
         );
       },
+      getFarcasterUsers: async (farcasterIDs: $ReadOnlyArray<string>) => {
+        const farcasterUsersJSONString =
+          await commRustModule.getFarcasterUsers(farcasterIDs);
+        const farcasterUsers = JSON.parse(farcasterUsersJSONString);
+        return assertWithValidator(farcasterUsers, farcasterUsersValidator);
+      },
     }),
     [getAuthMetadata],
   );