diff --git a/lib/hooks/input-state-container-hooks.js b/lib/hooks/input-state-container-hooks.js
--- a/lib/hooks/input-state-container-hooks.js
+++ b/lib/hooks/input-state-container-hooks.js
@@ -10,6 +10,7 @@
 import { useMediaMetadataReassignment } from './upload-hooks.js';
 import { useProcessBlobHolders } from '../actions/holder-actions.js';
 import { useSendComposableDMOperation } from '../shared/dm-ops/process-dm-ops.js';
+import { useSendFarcasterTextMessage } from '../shared/farcaster/farcaster-api.js';
 import { useMessageCreationSideEffectsFunc } from '../shared/message-utils.js';
 import { threadSpecs } from '../shared/threads/thread-specs.js';
 import { messageTypes } from '../types/message-types-enum.js';
@@ -20,6 +21,7 @@
 } from '../types/message-types.js';
 import type { RawTextMessageInfo } from '../types/messages/text.js';
 import type { ThreadInfo } from '../types/minimally-encoded-thread-permissions-types.js';
+import { useCurrentUserFID } from '../utils/farcaster-utils.js';
 import { useSelector, useDispatch } from '../utils/redux-utils.js';
 
 function useInputStateContainerSendTextMessage(): (
@@ -30,8 +32,10 @@
 ) => Promise<SendMessagePayload> {
   const sendKeyserverTextMessage = useSendTextMessage();
   const sendComposableDMOperation = useSendComposableDMOperation();
+  const sendFarcasterTextMessage = useSendFarcasterTextMessage();
   const sideEffectsFunction =
     useMessageCreationSideEffectsFunc<RawTextMessageInfo>(messageTypes.TEXT);
+  const currentUserFID = useCurrentUserFID();
 
   return React.useCallback(
     (
@@ -51,9 +55,17 @@
           sendKeyserverTextMessage,
           sendComposableDMOperation,
           sideEffectsFunction,
+          sendFarcasterTextMessage,
+          currentUserFID,
         },
       ),
-    [sendComposableDMOperation, sendKeyserverTextMessage, sideEffectsFunction],
+    [
+      sendComposableDMOperation,
+      sendKeyserverTextMessage,
+      sideEffectsFunction,
+      sendFarcasterTextMessage,
+      currentUserFID,
+    ],
   );
 }
 
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
@@ -36,7 +36,7 @@
     messageId: t.String,
   });
 
-type SendFarcasterMessageResult = {
+export type SendFarcasterMessageResult = {
   +result: SendFarcasterMessageResultData,
   ...
 };
diff --git a/lib/shared/id-utils.js b/lib/shared/id-utils.js
--- a/lib/shared/id-utils.js
+++ b/lib/shared/id-utils.js
@@ -138,6 +138,16 @@
   return localID.replace(localIDPrefix, '');
 }
 
+const farcasterIDPrefix = 'FARCASTER#';
+
+function farcasterThreadIDFromConversationID(conversationID: string): string {
+  return `${farcasterIDPrefix}${conversationID}`;
+}
+
+function conversationIDFromFarcasterThreadID(threadID: string): string {
+  return threadID.replace(farcasterIDPrefix, '');
+}
+
 export {
   getNextLocalID,
   getOldestNonLocalMessageID,
@@ -149,4 +159,7 @@
   messageKey,
   localIDPrefix,
   getIDFromLocalID,
+  farcasterIDPrefix,
+  farcasterThreadIDFromConversationID,
+  conversationIDFromFarcasterThreadID,
 };
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
@@ -1,5 +1,7 @@
 // @flow
 
+import invariant from 'invariant';
+
 import { getFarcasterRolePermissionsBlobs } from '../../../permissions/farcaster-permissions.js';
 import type { RolePermissionBlobs } from '../../../permissions/thread-permissions.js';
 import type { SetThreadUnreadStatusPayload } from '../../../types/activity-types.js';
@@ -32,12 +34,59 @@
   ThreadJoinPayload,
 } from '../../../types/thread-types.js';
 import { farcasterThreadIDRegExp } from '../../../utils/validation-utils.js';
+import { conversationIDFromFarcasterThreadID } from '../../id-utils.js';
 import { messageNotifyTypes } from '../../messages/message-spec.js';
-import type { ThreadProtocol } from '../thread-spec.js';
+import { getSingleOtherUser } from '../../thread-utils.js';
+import type {
+  ProtocolSendTextMessageInput,
+  SendTextMessageUtils,
+  ThreadProtocol,
+} from '../thread-spec.js';
 
 const farcasterThreadProtocol: ThreadProtocol<MemberInfoSansPermissions> = {
-  sendTextMessage: async (): Promise<SendMessagePayload> => {
-    throw new Error('sendTextMessage method is not yet implemented');
+  sendTextMessage: async (
+    message: ProtocolSendTextMessageInput,
+    utils: SendTextMessageUtils,
+  ): Promise<SendMessagePayload> => {
+    const { sendFarcasterTextMessage, currentUserFID } = utils;
+    const { messageInfo, threadInfo } = message;
+    const { localID } = messageInfo;
+    invariant(
+      localID !== null && localID !== undefined,
+      'localID should be set',
+    );
+
+    const time = Date.now();
+
+    let request;
+    if (threadInfo.type === farcasterThreadTypes.FARCASTER_PERSONAL) {
+      const otherUser = getSingleOtherUser(threadInfo, currentUserFID);
+      invariant(
+        otherUser,
+        `Farcaster 1:1 conversation should have one more member except ${
+          currentUserFID ?? 'null'
+        }`,
+      );
+      request = {
+        recipientFid: otherUser,
+        message: messageInfo.text,
+      };
+    } else {
+      const conversationID = conversationIDFromFarcasterThreadID(threadInfo.id);
+      request = {
+        groupId: conversationID,
+        message: messageInfo.text,
+      };
+    }
+
+    const result = await sendFarcasterTextMessage(request);
+
+    return {
+      localID,
+      serverID: result.result.messageId,
+      threadID: messageInfo.threadID,
+      time: time,
+    };
   },
 
   sendMultimediaMessage: async (): Promise<SendMultimediaMessagePayload> => {
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
@@ -84,6 +84,10 @@
   OutboundComposableDMOperationSpecification,
   OutboundDMOperationSpecification,
 } from '../dm-ops/dm-op-types.js';
+import type {
+  SendFarcasterMessageResult,
+  SendFarcasterTextMessageInput,
+} from '../farcaster/farcaster-api.js';
 import type { FetchThickMessagesType } from '../message-utils.js';
 import type {
   CreationSideEffectsFunc,
@@ -108,6 +112,8 @@
 export type SendTextMessageUtils = {
   +sendKeyserverTextMessage: SendTextMessageInput => Promise<SendMessageResult>,
   +sendComposableDMOperation: OutboundComposableDMOperationSpecification => Promise<ProcessOutboundP2PMessagesResult>,
+  +sendFarcasterTextMessage: SendFarcasterTextMessageInput => Promise<SendFarcasterMessageResult>,
+  +currentUserFID: ?string,
   +sideEffectsFunction: CreationSideEffectsFunc<RawTextMessageInfo>,
 };
 
diff --git a/lib/utils/farcaster-utils.js b/lib/utils/farcaster-utils.js
--- a/lib/utils/farcaster-utils.js
+++ b/lib/utils/farcaster-utils.js
@@ -7,7 +7,6 @@
 import { getConfig } from './config.js';
 import { getContentSigningKey } from './crypto-utils.js';
 import { useSelector, useDispatch } from './redux-utils.js';
-import { farcasterIDPrefix } from './validation-utils.js';
 import { setSyncedMetadataEntryActionType } from '../actions/synced-metadata-actions.js';
 import { useUserIdentityCache } from '../components/user-identity-cache.react.js';
 import { getFarcasterRolePermissionsBlobsFromConversation } from '../permissions/farcaster-permissions.js';
@@ -20,6 +19,7 @@
 import { generatePendingThreadColor } from '../shared/color-utils.js';
 import type { FarcasterConversation } from '../shared/farcaster/farcaster-conversation-types.js';
 import type { FarcasterMessage } from '../shared/farcaster/farcaster-messages-types.js';
+import { farcasterThreadIDFromConversationID } from '../shared/id-utils.js';
 import { IdentityClientContext } from '../shared/identity-client-context.js';
 import { PeerToPeerContext } from '../tunnelbroker/peer-to-peer-context.js';
 import type { ClientAvatar } from '../types/avatar-types.js';
@@ -269,10 +269,6 @@
   );
 }
 
-function farcasterThreadIDFromConversationID(conversationID: string): string {
-  return `${farcasterIDPrefix}${conversationID}`;
-}
-
 function createPermissionsInfo(
   permissionsBlob: ThreadRolePermissionsBlob,
   threadID: string,
@@ -329,14 +325,14 @@
     .map(p => `${p.fid}`);
   const adminIDs = new Set(conversation.adminFids.map(fid => `${fid}`));
 
-  const members = userIDs.map(id => ({
-    id,
+  const members = userIDs.map(fid => ({
+    id: fid,
     // This flag was introduced for sidebars to show who replied to a thread.
     // Now it doesn't seem to be used anywhere. Regardless, for Farcaster
     // threads its value doesn't matter.
     isSender: true,
     minimallyEncoded: true,
-    role: adminIDs.has(id) && adminsRole ? adminsRole.id : membersRole.id,
+    role: adminIDs.has(fid) && adminsRole ? adminsRole.id : membersRole.id,
   }));
 
   const currentUserRole =
diff --git a/lib/utils/validation-utils.js b/lib/utils/validation-utils.js
--- a/lib/utils/validation-utils.js
+++ b/lib/utils/validation-utils.js
@@ -17,6 +17,7 @@
   oldValidUsernameRegex,
   validHexColorRegex,
 } from '../shared/account-utils.js';
+import { farcasterIDPrefix } from '../shared/id-utils.js';
 import type { PlatformDetails } from '../types/device-types';
 import type {
   MediaMessageServerDBContent,
@@ -125,7 +126,6 @@
   '[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{12}';
 const thickIDRegExp: RegExp = new RegExp(`^${uuidRegex}$`);
 
-const farcasterIDPrefix = 'FARCASTER#';
 const farcasterThreadIDRegex = `${farcasterIDPrefix}(?:(?:[0-9a-z]+)|(?:[0-9]+-[0-9]+))`;
 const farcasterThreadIDRegExp: RegExp = new RegExp(
   `^${farcasterThreadIDRegex}$`,
@@ -189,5 +189,4 @@
   idSchemaRegExp,
   farcasterThreadIDRegExp,
   isKeyserverThreadID,
-  farcasterIDPrefix,
 };