diff --git a/lib/types/farcaster-types.js b/lib/types/farcaster-types.js
--- a/lib/types/farcaster-types.js
+++ b/lib/types/farcaster-types.js
@@ -84,3 +84,8 @@
   +data: NeynarWebhookCastCreatedData,
   ...
 };
+
+export type NeynarPostCastResponse = {
+  +success: boolean,
+  ...
+};
diff --git a/lib/utils/neynar-client.js b/lib/utils/neynar-client.js
--- a/lib/utils/neynar-client.js
+++ b/lib/utils/neynar-client.js
@@ -7,6 +7,7 @@
   NeynarChannel,
   NeynarUser,
   NeynarCast,
+  NeynarPostCastResponse,
 } from '../types/farcaster-types.js';
 
 type FetchRelevantFollowersResponse = {
@@ -357,6 +358,40 @@
       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),
+      });
+
+      const json = await response.json();
+
+      return json;
+    } catch (error) {
+      console.log(
+        'Failed to post Farcaster cast:',
+        getMessageForException(error) ?? 'unknown',
+      );
+      throw error;
+    }
+  }
 }
 
 export { NeynarClient };