diff --git a/lib/types/farcaster-types.js b/lib/types/farcaster-types.js
index 701d24b00..b45c76b48 100644
--- a/lib/types/farcaster-types.js
+++ b/lib/types/farcaster-types.js
@@ -1,86 +1,91 @@
 // @flow
 
 // This is a message that the rendered webpage
 // (landing/connect-farcaster.react.js) uses to communicate back
 // to the React Native WebView that is rendering it
 // (native/components/farcaster-web-view.react.js)
 export type FarcasterWebViewMessage =
   | {
       +type: 'farcaster_url',
       +url: string,
     }
   | {
       +type: 'farcaster_data',
       +fid: string,
     };
 
 export type NeynarUser = {
   +fid: number,
   +username: string,
   +pfp_url: string,
   ...
 };
 
 export type NeynarUserWithViewerContext = $ReadOnly<{
   ...NeynarUser,
   +viewerContext: {
     +following: boolean,
   },
   ...
 }>;
 
 export type NeynarChannel = {
   +id: string,
   +name: string,
   +follower_count: number,
   +lead: {
     +fid: number,
     ...
   },
   +image_url: string,
   +description: string,
   ...
 };
 
 export type NeynarCast = {
   +hash: string,
   +thread_hash: string,
   +text: string,
   +author: NeynarUser,
   ...
 };
 
 export type NeynarWebhookCastAuthor = {
   +object: 'user',
   +fid: number,
   +custody_address: string,
   +username: string,
   +display_name: string,
   +pfp_url: string,
   ...
 };
 
 export type NeynarWebhookCastCreatedData = {
   +object: 'cast',
   +hash: string,
   +thread_hash: string,
   +text: string,
   +channel?: ?NeynarWebhookChannel,
   +parent_hash?: ?string,
   +author: NeynarWebhookCastAuthor,
   ...
 };
 
 export type NeynarWebhookChannel = {
   +id: string,
   +name: string,
   +image_url: string,
   ...
 };
 
 export type NeynarWebhookCastCreatedEvent = {
   +created_at: number,
   +type: 'cast.created',
   +data: NeynarWebhookCastCreatedData,
   ...
 };
+
+export type NeynarPostCastResponse = {
+  +success: boolean,
+  ...
+};
diff --git a/lib/utils/neynar-client.js b/lib/utils/neynar-client.js
index ebc74c6fe..a893fd073 100644
--- a/lib/utils/neynar-client.js
+++ b/lib/utils/neynar-client.js
@@ -1,362 +1,395 @@
 // @flow
 
 import invariant from 'invariant';
 
 import { getMessageForException } from './errors.js';
 import type {
   NeynarChannel,
   NeynarUser,
   NeynarCast,
+  NeynarPostCastResponse,
 } from '../types/farcaster-types.js';
 
 type FetchRelevantFollowersResponse = {
   +all_relevant_followers_dehydrated: $ReadOnlyArray<{
     +user: {
       +fid: number,
       ...
     },
     ...
   }>,
   ...
 };
 
 type FetchFarcasterChannelsResponse = {
   +channels: $ReadOnlyArray<NeynarChannel>,
   +next: {
     +cursor: ?string,
   },
 };
 
 type FetchUsersResponse = {
   +users: $ReadOnlyArray<NeynarUser>,
 };
 
 type FetchFarcasterChannelInfoResponse = {
   +channel: NeynarChannel,
 };
 
 type FetchFarcasterCastByHashResponse = {
   +cast: NeynarCast,
 };
 
 export type FarcasterUser = {
   +username: string,
   +pfpURL: string,
 };
 
 const neynarBaseURL = 'https://api.neynar.com/';
 const neynarURLs = {
   '1': `${neynarBaseURL}v1/farcaster/`,
   '2': `${neynarBaseURL}v2/farcaster/`,
 };
 function getNeynarURL(
   apiVersion: string,
   apiCall: string,
   params: { [string]: string },
 ): string {
   const neynarURL = neynarURLs[apiVersion];
   invariant(
     neynarURL,
     `could not find Neynar URL for apiVersion ${apiVersion}`,
   );
   return `${neynarURL}${apiCall}?${new URLSearchParams(params).toString()}`;
 }
 
 const fetchFollowedChannelsLimit = 100;
 const fetchChannelsLimit = 50;
 
 class NeynarClient {
   apiKey: string;
 
   constructor(apiKey: string) {
     this.apiKey = apiKey;
   }
 
   // We're using the term "friend" for a bidirectional follow
   async fetchFriendFIDs(fid: string): Promise<string[]> {
     const params: { [string]: string } = {
       target_fid: fid,
       viewer_fid: fid,
     };
 
     const url = getNeynarURL('2', 'followers/relevant', params);
 
     try {
       const response = await fetch(url, {
         method: 'GET',
         headers: {
           Accept: 'application/json',
           api_key: this.apiKey,
         },
       });
 
       const json: FetchRelevantFollowersResponse = await response.json();
       const { all_relevant_followers_dehydrated } = json;
 
       return all_relevant_followers_dehydrated.map(follower =>
         follower.user.fid.toString(),
       );
     } catch (error) {
       console.log(
         'Failed to fetch friend FIDs:',
         getMessageForException(error) ?? 'unknown',
       );
       throw error;
     }
   }
 
   async fetchFollowedFarcasterChannelsWithFilter(
     fid: string,
     filterFn: (channel: NeynarChannel) => boolean,
   ): Promise<NeynarChannel[]> {
     const farcasterChannels = [];
     let paginationCursor = null;
 
     do {
       const params: { [string]: string } = {
         fid,
         limit: fetchFollowedChannelsLimit.toString(),
         ...(paginationCursor ? { cursor: paginationCursor } : null),
       };
 
       const url = getNeynarURL('2', 'user/channels', params);
 
       try {
         const response = await fetch(url, {
           method: 'GET',
           headers: {
             Accept: 'application/json',
             api_key: this.apiKey,
           },
         });
 
         const json: FetchFarcasterChannelsResponse = await response.json();
 
         const { channels, next } = json;
 
         channels.forEach(channel => {
           if (filterFn(channel)) {
             farcasterChannels.push(channel);
           }
         });
 
         paginationCursor = next.cursor;
       } catch (error) {
         console.log(
           'Failed to fetch followed Farcaster channels:',
           getMessageForException(error) ?? 'unknown',
         );
         throw error;
       }
     } while (paginationCursor);
 
     return farcasterChannels;
   }
 
   fetchFollowedFarcasterChannels(fid: string): Promise<NeynarChannel[]> {
     return this.fetchFollowedFarcasterChannelsWithFilter(fid, () => true);
   }
 
   async fetchFarcasterChannelByID(channelID: string): Promise<?NeynarChannel> {
     const params: { [string]: string } = {
       q: channelID,
     };
 
     const url = getNeynarURL('2', 'channel/search', params);
 
     try {
       const response = await fetch(url, {
         method: 'GET',
         headers: {
           Accept: 'application/json',
           api_key: this.apiKey,
         },
       });
 
       const json: FetchFarcasterChannelsResponse = await response.json();
       const { channels } = json;
 
       for (const channel of channels) {
         if (channel.id.toLowerCase() === channelID.toLowerCase()) {
           return channel;
         }
       }
 
       return null;
     } catch (error) {
       console.log(
         `Failed to search Farcaster channel by ID:`,
         getMessageForException(error) ?? 'unknown',
       );
       throw error;
     }
   }
 
   async getFarcasterUsers(
     fids: $ReadOnlyArray<string>,
   ): Promise<Array<?FarcasterUser>> {
     const fidsLeft = [...fids];
     const results: Array<?FarcasterUser> = [];
     do {
       // Neynar API allows querying 100 at a time
       const batch = fidsLeft.splice(0, 100);
       const url = getNeynarURL('2', 'user/bulk', { fids: batch.join(',') });
       try {
         const response = await fetch(url, {
           method: 'GET',
           headers: {
             Accept: 'application/json',
             api_key: this.apiKey,
           },
         });
 
         const json: FetchUsersResponse = await response.json();
         const { users } = json;
 
         const neynarUserMap = new Map<number, NeynarUser>();
         for (const neynarUser of users) {
           neynarUserMap.set(neynarUser.fid, neynarUser);
         }
 
         for (const fid of batch) {
           const neynarUser = neynarUserMap.get(parseInt(fid));
           results.push(
             neynarUser
               ? { username: neynarUser.username, pfpURL: neynarUser.pfp_url }
               : null,
           );
         }
       } catch (error) {
         console.log(
           'Failed to fetch Farcaster usernames:',
           getMessageForException(error) ?? 'unknown',
         );
         throw error;
       }
     } while (fidsLeft.length > 0);
     return results;
   }
 
   async getAllChannels(): Promise<Array<NeynarChannel>> {
     const farcasterChannels = [];
     let paginationCursor = null;
 
     do {
       const params: { [string]: string } = {
         limit: fetchChannelsLimit.toString(),
         ...(paginationCursor ? { cursor: paginationCursor } : null),
       };
 
       const url = getNeynarURL('2', 'channel/list', params);
 
       try {
         const response = await fetch(url, {
           method: 'GET',
           headers: {
             Accept: 'application/json',
             api_key: this.apiKey,
           },
         });
 
         const json: FetchFarcasterChannelsResponse = await response.json();
 
         const { channels, next } = json;
 
         channels.forEach(channel => {
           farcasterChannels.push(channel);
         });
 
         paginationCursor = next.cursor;
       } catch (error) {
         console.log(
           'Failed to fetch all Farcaster channels:',
           getMessageForException(error) ?? 'unknown',
         );
         throw error;
       }
     } while (paginationCursor);
 
     return farcasterChannels;
   }
 
   async fetchFarcasterChannelInfo(
     channelID: string,
     viewerFID: string,
   ): Promise<NeynarChannel> {
     const params: { [string]: string } = {
       id: channelID,
       type: 'id',
       viewer_fid: viewerFID,
     };
 
     const url = getNeynarURL('2', 'channel', params);
 
     try {
       const response = await fetch(url, {
         method: 'GET',
         headers: {
           Accept: 'application/json',
           api_key: this.apiKey,
         },
       });
 
       const json: FetchFarcasterChannelInfoResponse = await response.json();
 
       return json.channel;
     } catch (error) {
       console.log(
         'Failed to fetch Farcaster channel info:',
         getMessageForException(error) ?? 'unknown',
       );
       throw error;
     }
   }
 
   async checkIfCurrentUserFIDIsValid(fid: string): Promise<boolean> {
     const url = getNeynarURL('2', 'user/bulk', { fids: fid });
 
     try {
       const response = await fetch(url, {
         method: 'GET',
         headers: {
           Accept: 'application/json',
           api_key: this.apiKey,
         },
       });
 
       return response.ok;
     } catch (error) {
       console.log(
         'Failed to check if current user FID is valid:',
         getMessageForException(error) ?? 'unknown',
       );
       throw error;
     }
   }
 
   async fetchFarcasterCastByHash(hash: string): Promise<NeynarCast> {
     const url = getNeynarURL('2', 'cast', { identifier: hash, type: 'hash' });
 
     try {
       const response = await fetch(url, {
         method: 'GET',
         headers: {
           Accept: 'application/json',
           api_key: this.apiKey,
         },
       });
 
       const json: FetchFarcasterCastByHashResponse = await response.json();
 
       return json.cast;
     } catch (error) {
       console.log(
         'Failed to fetch Farcaster cast:',
         getMessageForException(error) ?? 'unknown',
       );
       throw error;
     }
   }
+
+  async postCast(
+    signerUUID: string,
+    parent: string,
+    text: string,
+  ): Promise<NeynarPostCastResponse> {
+    const url = getNeynarURL('2', 'cast', {});
+    const body = {
+      signer_uuid: signerUUID,
+      parent,
+      text,
+    };
+    try {
+      const response = await fetch(url, {
+        method: 'POST',
+        headers: {
+          'Accept': 'application/json',
+          'api_key': this.apiKey,
+          'Content-Type': 'application/json',
+        },
+        body: JSON.stringify(body),
+      });
+
+      return await response.json();
+    } catch (error) {
+      console.log(
+        'Failed to post Farcaster cast:',
+        getMessageForException(error) ?? 'unknown',
+      );
+      throw error;
+    }
+  }
 }
 
 export { NeynarClient };