diff --git a/keyserver/src/responders/farcaster-webhook-responders.js b/keyserver/src/responders/farcaster-webhook-responders.js
--- a/keyserver/src/responders/farcaster-webhook-responders.js
+++ b/keyserver/src/responders/farcaster-webhook-responders.js
@@ -323,11 +323,11 @@
     throw new ServerError('missing_signer_uuid');
   }
 
-  const postCastResponse = await neynarClient?.postCast(
-    neynarConfig.signerUUID,
-    castHash,
-    replyText,
-  );
+  const postCastResponse = await neynarClient?.postCast({
+    signerUUID: neynarConfig.signerUUID,
+    parent: castHash,
+    text: replyText,
+  });
 
   if (!postCastResponse?.success) {
     throw new ServerError('post_cast_failed');
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
@@ -345,17 +345,29 @@
     }
   }
 
-  async postCast(
-    signerUUID: string,
-    parent: string,
-    text: string,
-  ): Promise<NeynarPostCastResponse> {
+  async postCast(params: {
+    +signerUUID: string,
+    +parent: string,
+    +text?: ?string,
+    +embeds?: ?$ReadOnlyArray<{ +url: string }>,
+  }): Promise<NeynarPostCastResponse> {
     const url = getNeynarURL('2', 'cast', {});
-    const body = {
-      signer_uuid: signerUUID,
+    const body: {
+      signer_uuid: string,
+      parent: string,
+      text?: string,
+      embeds?: $ReadOnlyArray<{ +url: string }>,
+    } = {
+      signer_uuid: params.signerUUID,
       parent,
-      text,
     };
+
+    if (params.embeds) {
+      body.embeds = params.embeds;
+    }
+    if (params.text) {
+      body.text = params.text;
+    }
     try {
       const response = await fetch(url, {
         method: 'POST',