diff --git a/lib/hooks/thread-hooks.js b/lib/hooks/thread-hooks.js
--- a/lib/hooks/thread-hooks.js
+++ b/lib/hooks/thread-hooks.js
@@ -20,6 +20,7 @@
   useUpdateFarcasterGroupNameAndDescription,
   useModifyFarcasterMembershipInput,
   useAcceptInvite,
+  useAcceptOneOnOneInvite,
 } from '../shared/farcaster/farcaster-api.js';
 import {
   useFetchConversation,
@@ -507,6 +508,7 @@
   );
   const keyserverCall = useJoinKeyserverThread();
   const farcasterAcceptInvite = useAcceptInvite();
+  const farcasterAcceptOneOnOneInvite = useAcceptOneOnOneInvite();
   const refreshFarcasterConversation = useRefreshFarcasterConversation();
 
   return React.useCallback(
@@ -522,6 +524,7 @@
           calendarQuery: input.calendarQuery,
           farcasterAcceptInvite,
           refreshFarcasterConversation,
+          farcasterAcceptOneOnOneInvite,
         },
       ),
     [
@@ -530,6 +533,7 @@
       processAndSendDMOperation,
       refreshFarcasterConversation,
       viewerID,
+      farcasterAcceptOneOnOneInvite,
     ],
   );
 }
diff --git a/lib/shared/farcaster/farcaster-api.js b/lib/shared/farcaster/farcaster-api.js
--- a/lib/shared/farcaster/farcaster-api.js
+++ b/lib/shared/farcaster/farcaster-api.js
@@ -854,6 +854,41 @@
   );
 }
 
+export type AcceptOneOnOneInviteInput = {
+  +conversationId: string,
+  +category: 'default',
+};
+
+function useAcceptOneOnOneInvite(): (
+  input: AcceptOneOnOneInviteInput,
+) => Promise<void> {
+  const { sendFarcasterRequest } = useTunnelbroker();
+  const { addLog } = useDebugLogs();
+  return React.useCallback(
+    async (input: AcceptOneOnOneInviteInput) => {
+      try {
+        await sendFarcasterRequest({
+          apiVersion: 'v2',
+          endpoint: 'direct-cast-conversation-categorization',
+          method: { type: 'POST' },
+          payload: JSON.stringify(input),
+        });
+      } catch (error) {
+        addLog(
+          'Farcaster API: Failed to accept one-one-one invite',
+          JSON.stringify({
+            conversationId: input.conversationId,
+            error: getMessageForException(error),
+          }),
+          new Set([logTypes.FARCASTER, logTypes.ERROR]),
+        );
+        throw error;
+      }
+    },
+    [addLog, sendFarcasterRequest],
+  );
+}
+
 export {
   useSendFarcasterTextMessage,
   useFetchFarcasterMessages,
@@ -869,4 +904,5 @@
   useSendFarcasterReaction,
   useAcceptInvite,
   useFetchFarcasterConversationInvites,
+  useAcceptOneOnOneInvite,
 };
diff --git a/lib/shared/threads/protocols/farcaster-thread-protocol.js b/lib/shared/threads/protocols/farcaster-thread-protocol.js
--- a/lib/shared/threads/protocols/farcaster-thread-protocol.js
+++ b/lib/shared/threads/protocols/farcaster-thread-protocol.js
@@ -916,10 +916,18 @@
     utils: JoinThreadUtils,
   ): Promise<ThreadJoinPayload> => {
     const threadID = input.rawThreadInfo.id;
+    const threadType = input.rawThreadInfo.type;
     const conversationID = conversationIDFromFarcasterThreadID(threadID);
-    await utils.farcasterAcceptInvite({
-      conversationId: conversationID,
-    });
+    if (threadTypeIsPersonal(threadType)) {
+      await utils.farcasterAcceptOneOnOneInvite({
+        conversationId: conversationID,
+        category: 'default',
+      });
+    } else {
+      await utils.farcasterAcceptInvite({
+        conversationId: conversationID,
+      });
+    }
 
     await utils.refreshFarcasterConversation(conversationID);
 
diff --git a/lib/shared/threads/thread-spec.js b/lib/shared/threads/thread-spec.js
--- a/lib/shared/threads/thread-spec.js
+++ b/lib/shared/threads/thread-spec.js
@@ -101,6 +101,7 @@
   ModifyFarcasterMembershipInput,
   SendReactionInput,
   AcceptInviteInput,
+  AcceptOneOnOneInviteInput,
 } from '../farcaster/farcaster-api.js';
 import type { FarcasterConversation } from '../farcaster/farcaster-conversation-types.js';
 import type { FarcasterMessageFetchingContextType } from '../farcaster/farcaster-message-fetching-context.js';
@@ -378,6 +379,9 @@
   +keyserverJoinThread: ClientThreadJoinRequest => Promise<ThreadJoinPayload>,
   +calendarQuery: () => CalendarQuery,
   +farcasterAcceptInvite: (input: AcceptInviteInput) => Promise<void>,
+  +farcasterAcceptOneOnOneInvite: (
+    input: AcceptOneOnOneInviteInput,
+  ) => Promise<void>,
   +refreshFarcasterConversation: (conversationId: string) => Promise<mixed>,
 };