diff --git a/src/app/api/posts/route.ts b/src/app/api/posts/route.ts
index 0926fb4..0a79060 100644
--- a/src/app/api/posts/route.ts
+++ b/src/app/api/posts/route.ts
@@ -161,6 +161,27 @@ export async function POST(request: Request) {
         // Federate the post to remote followers (non-blocking)
         (async () => {
             try {
+                // SWARM-FIRST: Deliver to swarm followers directly
+                const { deliverPostToSwarmFollowers } = await import('@/lib/swarm/interactions');
+                
+                const swarmResult = await deliverPostToSwarmFollowers(
+                    user.id,
+                    post,
+                    {
+                        handle: user.handle,
+                        displayName: user.displayName,
+                        avatarUrl: user.avatarUrl,
+                        isNsfw: user.isNsfw,
+                    },
+                    attachedMedia,
+                    nodeDomain
+                );
+                
+                if (swarmResult.delivered > 0) {
+                    console.log(`[Swarm] Post ${post.id} delivered to ${swarmResult.delivered} swarm nodes (${swarmResult.failed} failed)`);
+                }
+
+                // FALLBACK: Deliver to ActivityPub followers
                 const { createCreateActivity } = await import('@/lib/activitypub/activities');
                 const { getFollowerInboxes, deliverToFollowers } = await import('@/lib/activitypub/outbox');
 
diff --git a/src/app/api/swarm/inbox/route.ts b/src/app/api/swarm/inbox/route.ts
new file mode 100644
index 0000000..ff8e2af
--- /dev/null
+++ b/src/app/api/swarm/inbox/route.ts
@@ -0,0 +1,156 @@
+/**
+ * Swarm Inbox Endpoint
+ * 
+ * POST: Receive posts from users on other swarm nodes that local users follow
+ * 
+ * This is the swarm equivalent of ActivityPub inbox - when a user on another
+ * Synapsis node creates a post, it gets pushed here for their followers.
+ */
+
+import { NextRequest, NextResponse } from 'next/server';
+import { db, posts, users, media, remoteFollowers } from '@/db';
+import { eq, and } from 'drizzle-orm';
+import { z } from 'zod';
+
+const swarmPostSchema = z.object({
+  post: z.object({
+    id: z.string(),
+    content: z.string(),
+    createdAt: z.string(),
+    isNsfw: z.boolean(),
+    replyToId: z.string().optional(),
+    repostOfId: z.string().optional(),
+    media: z.array(z.object({
+      url: z.string(),
+      mimeType: z.string().optional(),
+      altText: z.string().optional(),
+    })).optional(),
+    linkPreviewUrl: z.string().optional(),
+    linkPreviewTitle: z.string().optional(),
+    linkPreviewDescription: z.string().optional(),
+    linkPreviewImage: z.string().optional(),
+  }),
+  author: z.object({
+    handle: z.string(),
+    displayName: z.string(),
+    avatarUrl: z.string().optional(),
+    isNsfw: z.boolean(),
+  }),
+  nodeDomain: z.string(),
+  timestamp: z.string(),
+});
+
+/**
+ * POST /api/swarm/inbox
+ * 
+ * Receives a post from another swarm node.
+ * Stores it for local users who follow the author.
+ */
+export async function POST(request: NextRequest) {
+  try {
+    if (!db) {
+      return NextResponse.json({ error: 'Database not available' }, { status: 503 });
+    }
+
+    const body = await request.json();
+    const data = swarmPostSchema.parse(body);
+
+    // Construct the swarm post ID
+    const swarmPostId = `swarm:${data.nodeDomain}:${data.post.id}`;
+    
+    // Check if we already have this post
+    const existingPost = await db.query.posts.findFirst({
+      where: eq(posts.apId, swarmPostId),
+    });
+
+    if (existingPost) {
+      return NextResponse.json({
+        success: true,
+        message: 'Post already exists',
+      });
+    }
+
+    // Check if anyone on this node follows the author
+    const authorActorUrl = `swarm://${data.nodeDomain}/${data.author.handle}`;
+    const hasFollowers = await db.query.remoteFollowers.findFirst({
+      where: eq(remoteFollowers.actorUrl, authorActorUrl),
+    });
+
+    // Even if no one follows, we might want to cache for timeline
+    // For now, only store if someone follows
+    if (!hasFollowers) {
+      return NextResponse.json({
+        success: true,
+        message: 'No local followers',
+      });
+    }
+
+    // Get or create placeholder user for the remote author
+    const remoteHandle = `${data.author.handle}@${data.nodeDomain}`;
+    let remoteUser = await db.query.users.findFirst({
+      where: eq(users.handle, remoteHandle),
+    });
+
+    if (!remoteUser) {
+      const [newUser] = await db.insert(users).values({
+        did: `did:swarm:${data.nodeDomain}:${data.author.handle}`,
+        handle: remoteHandle,
+        displayName: data.author.displayName,
+        avatarUrl: data.author.avatarUrl || null,
+        isNsfw: data.author.isNsfw,
+        publicKey: 'swarm-remote-user',
+      }).returning();
+      remoteUser = newUser;
+    } else {
+      // Update profile info if changed
+      await db.update(users)
+        .set({
+          displayName: data.author.displayName,
+          avatarUrl: data.author.avatarUrl || remoteUser.avatarUrl,
+          isNsfw: data.author.isNsfw,
+        })
+        .where(eq(users.id, remoteUser.id));
+    }
+
+    // Create the post
+    const [newPost] = await db.insert(posts).values({
+      userId: remoteUser.id,
+      content: data.post.content,
+      isNsfw: data.post.isNsfw || data.author.isNsfw,
+      apId: swarmPostId,
+      apUrl: `https://${data.nodeDomain}/${data.author.handle}/posts/${data.post.id}`,
+      createdAt: new Date(data.post.createdAt),
+      linkPreviewUrl: data.post.linkPreviewUrl || null,
+      linkPreviewTitle: data.post.linkPreviewTitle || null,
+      linkPreviewDescription: data.post.linkPreviewDescription || null,
+      linkPreviewImage: data.post.linkPreviewImage || null,
+    }).returning();
+
+    // Store media attachments
+    if (data.post.media && data.post.media.length > 0) {
+      for (const m of data.post.media) {
+        await db.insert(media).values({
+          userId: remoteUser.id,
+          postId: newPost.id,
+          url: m.url,
+          mimeType: m.mimeType || null,
+          altText: m.altText || null,
+        });
+      }
+    }
+
+    console.log(`[Swarm] Received post from ${remoteHandle}: ${newPost.id}`);
+
+    return NextResponse.json({
+      success: true,
+      message: 'Post received',
+      postId: newPost.id,
+    });
+  } catch (error) {
+    if (error instanceof z.ZodError) {
+      return NextResponse.json({ error: 'Invalid request', details: error.issues }, { status: 400 });
+    }
+    console.error('[Swarm] Inbox error:', error);
+    return NextResponse.json({ error: 'Failed to process post' }, { status: 500 });
+  }
+}
diff --git a/src/lib/swarm/interactions.ts b/src/lib/swarm/interactions.ts
index 3e5fae0..6b72815 100644
--- a/src/lib/swarm/interactions.ts
+++ b/src/lib/swarm/interactions.ts
@@ -472,3 +472,153 @@ export async function deliverSwarmMentions(
   
   return { delivered, failed };
 }
+
+
+// ============================================
+// POST DELIVERY TO SWARM FOLLOWERS
+// ============================================
+
+export interface SwarmPostDeliveryPayload {
+  post: {
+    id: string;
+    content: string;
+    createdAt: string;
+    isNsfw: boolean;
+    replyToId?: string;
+    repostOfId?: string;
+    media?: { url: string; mimeType?: string; altText?: string }[];
+    linkPreviewUrl?: string;
+    linkPreviewTitle?: string;
+    linkPreviewDescription?: string;
+    linkPreviewImage?: string;
+  };
+  author: {
+    handle: string;
+    displayName: string;
+    avatarUrl?: string;
+    isNsfw: boolean;
+  };
+  nodeDomain: string;
+  timestamp: string;
+}
+
+/**
+ * Deliver a new post to a swarm node's inbox
+ * This is used to push posts to followers on other swarm nodes
+ */
+export async function deliverSwarmPost(
+  targetDomain: string,
+  payload: SwarmPostDeliveryPayload
+): Promise<SwarmInteractionResponse> {
+  return deliverSwarmInteraction(targetDomain, '/api/swarm/inbox', payload);
+}
+
+/**
+ * Get swarm follower domains from remote followers
+ * Returns domains of swarm nodes that have followers for this user
+ */
+export async function getSwarmFollowerDomains(userId: string): Promise<string[]> {
+  try {
+    const { db, remoteFollowers } = await import('@/db');
+    const { eq } = await import('drizzle-orm');
+
+    if (!db) return [];
+
+    const followers = await db.query.remoteFollowers.findMany({
+      where: eq(remoteFollowers.userId, userId),
+    });
+
+    // Filter for swarm followers (actorUrl starts with swarm://)
+    const swarmFollowers = followers.filter(f => f.actorUrl.startsWith('swarm://'));
+    
+    // Extract unique domains
+    const domains = swarmFollowers.map(f => {
+      const match = f.actorUrl.match(/^swarm:\/\/([^\/]+)/);
+      return match ? match[1] : null;
+    }).filter((d): d is string => d !== null);
+
+    return [...new Set(domains)];
+  } catch (error) {
+    console.error('[Swarm] Error getting swarm follower domains:', error);
+    return [];
+  }
+}
+
+/**
+ * Deliver a post to all swarm followers
+ */
+export async function deliverPostToSwarmFollowers(
+  userId: string,
+  post: {
+    id: string;
+    content: string;
+    createdAt: Date;
+    isNsfw: boolean;
+    replyToId?: string | null;
+    repostOfId?: string | null;
+    linkPreviewUrl?: string | null;
+    linkPreviewTitle?: string | null;
+    linkPreviewDescription?: string | null;
+    linkPreviewImage?: string | null;
+  },
+  author: {
+    handle: string;
+    displayName: string | null;
+    avatarUrl: string | null;
+    isNsfw: boolean;
+  },
+  media: { url: string; mimeType: string | null; altText: string | null }[],
+  nodeDomain: string
+): Promise<{ delivered: number; failed: number }> {
+  const swarmDomains = await getSwarmFollowerDomains(userId);
+  
+  if (swarmDomains.length === 0) {
+    return { delivered: 0, failed: 0 };
+  }
+
+  const payload: SwarmPostDeliveryPayload = {
+    post: {
+      id: post.id,
+      content: post.content,
+      createdAt: post.createdAt.toISOString(),
+      isNsfw: post.isNsfw,
+      replyToId: post.replyToId || undefined,
+      repostOfId: post.repostOfId || undefined,
+      media: media.length > 0 ? media.map(m => ({
+        url: m.url,
+        mimeType: m.mimeType || undefined,
+        altText: m.altText || undefined,
+      })) : undefined,
+      linkPreviewUrl: post.linkPreviewUrl || undefined,
+      linkPreviewTitle: post.linkPreviewTitle || undefined,
+      linkPreviewDescription: post.linkPreviewDescription || undefined,
+      linkPreviewImage: post.linkPreviewImage || undefined,
+    },
+    author: {
+      handle: author.handle,
+      displayName: author.displayName || author.handle,
+      avatarUrl: author.avatarUrl || undefined,
+      isNsfw: author.isNsfw,
+    },
+    nodeDomain,
+    timestamp: new Date().toISOString(),
+  };
+
+  let delivered = 0;
+  let failed = 0;
+
+  // Deliver to all swarm domains in parallel
+  const results = await Promise.allSettled(
+    swarmDomains.map(domain => deliverSwarmPost(domain, payload))
+  );
+
+  for (const result of results) {
+    if (result.status === 'fulfilled' && result.value.success) {
+      delivered++;
+    } else {
+      failed++;
+    }
+  }
+
+  return { delivered, failed };
+}