diff --git a/src/api/exposeApi.ts b/src/api/exposeApi.ts
new file mode 100644
index 0000000..7ac57ea
--- /dev/null
+++ b/src/api/exposeApi.ts
@@ -0,0 +1,239 @@
+/**
+ * Expose API - Manage public exposure of Tlon content via %expose agent
+ *
+ * The %expose agent allows publishing Tlon posts to the clearweb.
+ * Posts can be exposed at URLs like: https://ship.tlon.network/expose/chan/diary/~host/channel/note/123
+ */
+
+import { poke, scry } from './urbit';
+
+/** Channel kind for cite paths */
+export type ChannelKind = 'chat' | 'diary' | 'heap';
+
+/** Content type mapping for each channel kind */
+const CONTENT_TYPE_MAP: Record<ChannelKind, string> = {
+  chat: 'msg',
+  diary: 'note',
+  heap: 'curio',
+};
+
+/** A cite reference to a post */
+export interface Cite {
+  chan?: {
+    nest: [string, [string, string]]; // [kind, [ship, name]]
+    wer: string[]; // [type, id, ...]
+  };
+  group?: [string, string]; // [ship, name]
+  desk?: {
+    flag: [string, string];
+    wer: string[];
+  };
+}
+
+/**
+ * Expand a simplified cite path to full format
+ *
+ * @example
+ * expandCitePath('chat/~host/channel/170.141...')
+ * // Returns: '/1/chan/chat/~host/channel/msg/170.141...'
+ *
+ * expandCitePath('diary/~host/blog/170.141...')
+ * // Returns: '/1/chan/diary/~host/blog/note/170.141...'
+ */
+export function expandCitePath(input: string): string {
+  // Already in full format
+  if (input.startsWith('/1/')) {
+    return input;
+  }
+
+  // Handle simplified format: kind/~host/channel/post-id
+  const parts = input.split('/');
+  if (parts.length < 4) {
+    throw new Error(
+      `Invalid cite path. Expected format: chat/~host/channel/post-id or /1/chan/chat/~host/channel/msg/post-id`
+    );
+  }
+
+  const kind = parts[0] as ChannelKind;
+  const host = parts[1]; // ~ship
+  const channel = parts[2]; // channel-name
+  const postId = parts.slice(3).join('/'); // post-id (may have dots)
+
+  const contentType = CONTENT_TYPE_MAP[kind];
+  if (!contentType) {
+    throw new Error(
+      `Unknown channel kind: ${kind}. Expected chat, diary, or heap.`
+    );
+  }
+
+  return `/1/chan/${kind}/${host}/${channel}/${contentType}/${postId}`;
+}
+
+/**
+ * Convert a cite path to a URL path for the public endpoint
+ *
+ * @example
+ * citePathToUrlPath('/1/chan/chat/~host/channel/msg/123')
+ * // Returns: '/chan/chat/~host/channel/msg/123'
+ */
+export function citePathToUrlPath(citePath: string): string {
+  // Remove leading /1/ version prefix for URL
+  if (citePath.startsWith('/1/')) {
+    return citePath.slice(2);
+  }
+  return citePath;
+}
+
+/**
+ * Get the public URL for an exposed post
+ *
+ * @param citePath - The cite path (simplified or full format)
+ * @param shipUrl - The ship's base URL (e.g., 'https://ship.tlon.network')
+ * @returns The full public URL
+ *
+ * @example
+ * getExposedPostUrl('diary/~host/blog/170.141...', 'https://zod.tlon.network')
+ * // Returns: 'https://zod.tlon.network/expose/chan/diary/~host/blog/note/170.141...'
+ */
+export function getExposedPostUrl(citePath: string, shipUrl: string): string {
+  const fullPath = expandCitePath(citePath);
+  const urlPath = citePathToUrlPath(fullPath);
+  return `${shipUrl}/expose${urlPath}`;
+}
+
+/**
+ * Format a cite object (from scry) to a readable path string
+ */
+export function formatCite(cite: Cite | string): string {
+  if (typeof cite === 'string') {
+    return cite;
+  }
+
+  // Handle structured cite format from Urbit
+  if (cite.chan) {
+    const { nest, wer } = cite.chan;
+    const [kind, [ship, name]] = nest;
+    const werPath = Array.isArray(wer) ? wer.join('/') : wer;
+    return `/1/chan/${kind}/~${ship}/${name}/${werPath}`;
+  }
+
+  // Fallback: JSON stringify
+  return JSON.stringify(cite);
+}
+
+/**
+ * List all currently exposed content
+ *
+ * @returns Array of cite paths for all exposed posts
+ */
+export async function listExposedContent(): Promise<string[]> {
+  try {
+    const result = await scry<unknown>({
+      app: 'expose',
+      path: '/show',
+    });
+
+    // Result is a set of cites
+    if (Array.isArray(result)) {
+      return result.map((cite: Cite | string) => formatCite(cite));
+    }
+
+    // Handle set representation (object with values)
+    if (result && typeof result === 'object') {
+      const values = Object.values(result);
+      return values.map((cite: Cite | string) => formatCite(cite));
+    }
+
+    return [];
+  } catch (err: any) {
+    if (
+      err?.message?.includes('404') ||
+      err?.message?.includes('not found')
+    ) {
+      return [];
+    }
+    throw err;
+  }
+}
+
+/**
+ * Check if a specific post is currently exposed
+ *
+ * @param citePath - The cite path (simplified or full format)
+ * @returns true if the post is exposed, false otherwise
+ */
+export async function checkPostExposed(citePath: string): Promise<boolean> {
+  const fullPath = expandCitePath(citePath);
+
+  try {
+    const result = await scry<boolean>({
+      app: 'expose',
+      path: `/show${fullPath}`,
+    });
+    return !!result;
+  } catch (err: any) {
+    // 404 means not exposed
+    if (
+      err?.message?.includes('404') ||
+      err?.message?.includes('not found')
+    ) {
+      return false;
+    }
+    throw err;
+  }
+}
+
+/**
+ * Expose a post publicly on the clearweb
+ *
+ * @param citePath - The cite path (simplified or full format)
+ *
+ * @example
+ * await exposePost('diary/~zod/blog/170.141.184.507...')
+ */
+export async function exposePost(citePath: string): Promise<void> {
+  const fullPath = expandCitePath(citePath);
+
+  await poke({
+    app: 'expose',
+    mark: 'json',
+    json: {
+      show: fullPath,
+    },
+  });
+}
+
+/**
+ * Hide a previously exposed post
+ *
+ * @param citePath - The cite path (simplified or full format)
+ */
+export async function hideExposedPost(citePath: string): Promise<void> {
+  const fullPath = expandCitePath(citePath);
+
+  await poke({
+    app: 'expose',
+    mark: 'json',
+    json: {
+      hide: fullPath,
+    },
+  });
+}
+
+/**
+ * Set eager mode for expose agent
+ *
+ * When eager mode is enabled, the agent will pre-fetch pinned posts
+ * from other ships to prime the cache.
+ *
+ * @param eager - Whether to enable eager mode
+ */
+export async function setExposeEagerMode(eager: boolean): Promise<void> {
+  await poke({
+    app: 'expose',
+    mark: 'noun',
+    json: {
+      eager,
+    },
+  });
+}
diff --git a/src/api/index.ts b/src/api/index.ts
index 047a727..736c239 100644
--- a/src/api/index.ts
+++ b/src/api/index.ts
@@ -238,6 +238,23 @@ export {
   getHostingHeartBeat,
 } from './hostingApi';
 
+// =============================================================================
+// PUBLIC API - Expose (Clearweb Publishing)
+// =============================================================================
+export {
+  listExposedContent,
+  checkPostExposed,
+  exposePost,
+  hideExposedPost,
+  setExposeEagerMode,
+  expandCitePath,
+  citePathToUrlPath,
+  getExposedPostUrl,
+  formatCite,
+  type ChannelKind,
+  type Cite,
+} from './exposeApi';
+
 // =============================================================================
 // PUBLIC API - AI Summarization
 // =============================================================================