diff --git a/.github/workflows/deploy.yml b/.github/workflows/deploy.yml
index f40b2a4..0794a43 100644
--- a/.github/workflows/deploy.yml
+++ b/.github/workflows/deploy.yml
@@ -11,7 +11,8 @@ concurrency:
   cancel-in-progress: false
 
 permissions:
-  contents: read
+  # write so the IndexNow step can commit the updated sitemap snapshot back.
+  contents: write
 
 jobs:
   deploy-production:
@@ -20,6 +21,12 @@ jobs:
     steps:
       - name: Checkout code
         uses: actions/checkout@v4
+        with:
+          # Full history so the IndexNow step can diff this deploy's commit range.
+          fetch-depth: 0
+          # Don't leave a write-capable token in git config for the build /
+          # deploy steps. The snapshot push below supplies its own scoped token.
+          persist-credentials: false
 
       - name: Setup Node.js
         uses: actions/setup-node@v4
@@ -52,3 +59,42 @@ jobs:
           CLOUDFLARE_API_TOKEN: ${{ secrets.CLOUDFLARE_API_TOKEN }}
           CLOUDFLARE_ACCOUNT_ID: ${{ vars.CLOUDFLARE_ACCOUNT_ID }}
         run: npx wrangler deploy
+
+      # Ping IndexNow (Bing/Yandex/Seznam/Naver/DuckDuckGo — not Google) with the
+      # pages new or changed in this deploy. Diffs the freshly deployed sitemap
+      # against the committed snapshot (web/indexnow-state.json) for new pages
+      # and the git range for content edits — never the whole site. Production
+      # only; never runs on PR previews. The key is intentionally public (it is
+      # served at /<key>.txt for IndexNow to verify), so it lives inline. It is
+      # fixed to match the committed web/public/<key>.txt — overriding it would
+      # point keyLocation at a .txt this repo doesn't publish, failing validation.
+      - name: Notify IndexNow of changed pages
+        # Best-effort SEO ping after a successful deploy — never fail the deploy
+        # over a search-engine notification.
+        continue-on-error: true
+        working-directory: web
+        env:
+          INDEXNOW_KEY: d15f21b935684761ad607fb06b70b3d5
+          SITE_URL: https://agentrelay.com
+        run: node scripts/indexnow-submit.mjs "${{ github.event.before }}" "${{ github.sha }}"
+
+      # Persist the updated sitemap snapshot so the next deploy diffs against it.
+      # [skip ci] keeps this commit from re-triggering the deploy workflow. Guard
+      # to main so a workflow_dispatch from another ref can't fast-forward main
+      # with that ref's commits. Auth is a scoped token here, not persisted creds.
+      - name: Commit updated IndexNow snapshot
+        if: github.ref == 'refs/heads/main'
+        continue-on-error: true
+        working-directory: web
+        env:
+          GH_TOKEN: ${{ github.token }}
+        run: |
+          if git diff --quiet -- indexnow-state.json; then
+            echo "indexnow: snapshot unchanged — nothing to commit."
+            exit 0
+          fi
+          git config user.name  "github-actions[bot]"
+          git config user.email "github-actions[bot]@users.noreply.github.com"
+          git add indexnow-state.json
+          git commit -m "chore(seo): update IndexNow sitemap snapshot [skip ci]"
+          git push "https://x-access-token:${GH_TOKEN}@github.com/${{ github.repository }}.git" HEAD:main
diff --git a/web/indexnow-state.json b/web/indexnow-state.json
new file mode 100644
index 0000000..f87a444
--- /dev/null
+++ b/web/indexnow-state.json
@@ -0,0 +1,5 @@
+{
+  "host": "agentrelay.com",
+  "count": 0,
+  "urls": []
+}
diff --git a/web/public/d15f21b935684761ad607fb06b70b3d5.txt b/web/public/d15f21b935684761ad607fb06b70b3d5.txt
new file mode 100644
index 0000000..b4e1664
--- /dev/null
+++ b/web/public/d15f21b935684761ad607fb06b70b3d5.txt
@@ -0,0 +1 @@
+d15f21b935684761ad607fb06b70b3d5
\ No newline at end of file
diff --git a/web/scripts/indexnow-submit.mjs b/web/scripts/indexnow-submit.mjs
new file mode 100644
index 0000000..36ec367
--- /dev/null
+++ b/web/scripts/indexnow-submit.mjs
@@ -0,0 +1,212 @@
+#!/usr/bin/env node
+// Submit changed URLs to IndexNow (Bing, Yandex, Seznam, Naver, DuckDuckGo).
+//
+// IndexNow is a "this changed, please recrawl" ping — NOT a sitemap replacement
+// and NOT used by Google. We therefore submit only the delta for a deploy.
+//
+// Certainty comes from a committed snapshot of the last deploy's published URL
+// set (indexnow-state.json). Each run:
+//   1. current = the URL set from the freshly deployed sitemap.xml (authoritative)
+//   2. added   = current − snapshot                         (new pages — certain)
+//   3. changed = URLs from this deploy's git diff that already existed
+//                (content edits don't change the URL set, so the snapshot diff
+//                 alone can't see them)
+//   4. submit added ∪ changed, then rewrite the snapshot for the workflow to
+//      commit back. Anything submitted is always intersected with `current`, so
+//      we never ping a 404 / unpublished / dynamic route.
+//
+// Usage:
+//   node scripts/indexnow-submit.mjs <beforeSha> <afterSha>
+//
+// Env:
+//   INDEXNOW_KEY   (required) the key, also hosted at /<key>.txt
+//   SITE_URL       (optional) defaults to https://agentrelay.com
+//   STATE_FILE     (optional) defaults to ./indexnow-state.json (cwd = web/)
+//   DRY_RUN        (optional) "1"/"true" → log the payload, don't POST or write
+
+import { execFileSync } from 'node:child_process';
+import { readFileSync, writeFileSync, existsSync } from 'node:fs';
+
+const SITE_URL = (process.env.SITE_URL || 'https://agentrelay.com').replace(/\/$/, '');
+const HOST = new URL(SITE_URL).host;
+const KEY = process.env.INDEXNOW_KEY;
+const STATE_FILE = process.env.STATE_FILE || 'indexnow-state.json';
+const DRY_RUN = /^(1|true)$/i.test(process.env.DRY_RUN || '');
+const ENDPOINT = 'https://api.indexnow.org/indexnow';
+// IndexNow caps a single submission at 10k URLs.
+const MAX_URLS = 10000;
+
+function fail(msg) {
+  console.error(`indexnow: ${msg}`);
+  process.exit(1);
+}
+
+if (!KEY) {
+  // Expected on forks / non-production runs where the var isn't exposed. Exit 0
+  // so the (continue-on-error) step stays green rather than showing a red X.
+  console.log('indexnow: INDEXNOW_KEY is not set — skipping.');
+  process.exit(0);
+}
+
+const [, , beforeArg, afterArg] = process.argv;
+const after = afterArg || 'HEAD';
+// On the first push to a branch GitHub passes an all-zero "before" SHA; fall
+// back to the single-commit diff so we still catch that deploy's content edits.
+const ZERO = '0000000000000000000000000000000000000000';
+const before = !beforeArg || beforeArg === ZERO ? `${after}~1` : beforeArg;
+
+function changedFiles() {
+  try {
+    return execFileSync('git', ['diff', '--name-only', `${before}..${after}`], {
+      encoding: 'utf8',
+    })
+      .split('\n')
+      .map((l) => l.trim())
+      .filter(Boolean);
+  } catch (err) {
+    // A missing range (shallow clone, rewritten history) shouldn't break the
+    // run — the snapshot diff still catches new pages. Just skip "changed".
+    console.warn(`indexnow: git diff ${before}..${after} failed (${err.message}); skipping changed-page detection.`);
+    return [];
+  }
+}
+
+// Map a repo-relative changed file to the public path(s) it affects. Paths are
+// relative to the repo root (git diff emits root-relative paths from any cwd).
+function pathsForFile(file) {
+  // Blog + docs content mirror the route tree: content/<x>.mdx -> /<x>
+  let m = file.match(/^web\/content\/(blog\/.+|docs\/.+)\.mdx$/);
+  if (m) return [`/${m[1]}`];
+
+  // Static app routes: app/<route>/page.(tsx|mdx) -> /<route>. Skip dynamic
+  // segments ([slug]) — those are covered by their content files above.
+  m = file.match(/^web\/app\/(.+)\/page\.(tsx|mdx)$/);
+  if (m && !m[1].includes('[')) return [`/${m[1]}`];
+
+  if (/^web\/app\/page\.tsx$/.test(file)) return ['/'];
+
+  // The /agents catalog is data-driven (lib/agents.ts): a change there can
+  // touch every agent page. Signal "all /agents URLs"; the intersection with
+  // the live sitemap below narrows it to what's actually published.
+  if (file === 'web/lib/agents.ts') return ['__AGENTS__'];
+
+  return [];
+}
+
+async function fetchSitemapUrls() {
+  let res;
+  try {
+    res = await fetch(`${SITE_URL}/sitemap.xml`, {
+      headers: { 'user-agent': 'agentrelay-indexnow/1.0' },
+    });
+  } catch (err) {
+    fail(`could not reach ${SITE_URL}/sitemap.xml: ${err.message}`);
+  }
+  if (!res.ok) fail(`could not fetch sitemap.xml (${res.status})`);
+  const xml = await res.text();
+  const urls = new Set();
+  for (const match of xml.matchAll(/<loc>\s*([^<\s]+)\s*<\/loc>/g)) {
+    urls.add(match[1].trim());
+  }
+  if (urls.size === 0) fail('sitemap.xml contained no <loc> entries');
+  return urls;
+}
+
+function readSnapshot() {
+  if (!existsSync(STATE_FILE)) return new Set();
+  try {
+    const data = JSON.parse(readFileSync(STATE_FILE, 'utf8'));
+    return new Set(Array.isArray(data.urls) ? data.urls : []);
+  } catch (err) {
+    fail(`could not parse ${STATE_FILE}: ${err.message}`);
+  }
+}
+
+function writeSnapshot(urls) {
+  const data = {
+    host: HOST,
+    count: urls.length,
+    // Sorted for stable diffs / clean review of the committed file.
+    urls: [...urls].sort(),
+  };
+  writeFileSync(STATE_FILE, `${JSON.stringify(data, null, 2)}\n`);
+}
+
+// ── 1. authoritative current set ────────────────────────────────────────────
+const current = await fetchSitemapUrls();
+
+// ── 2. new pages: certain, from the committed snapshot ───────────────────────
+const snapshot = readSnapshot();
+const bootstrap = snapshot.size === 0;
+const added = [...current].filter((u) => !snapshot.has(u));
+
+// ── 3. edited existing pages: from this deploy's git diff ─────────────────────
+const files = changedFiles();
+const wantAllAgents = files.some((f) => pathsForFile(f).includes('__AGENTS__'));
+const changedCandidates = new Set(
+  files
+    .flatMap(pathsForFile)
+    .filter((p) => p && p !== '__AGENTS__')
+    // Build URLs the same way sitemap.ts does (new URL against the origin) so
+    // they match the sitemap exactly — including the homepage's trailing slash.
+    .map((p) => new URL(p, SITE_URL).toString()),
+);
+if (wantAllAgents) {
+  for (const u of current) if (u.startsWith(`${SITE_URL}/agents/`)) changedCandidates.add(u);
+}
+// Only existing, still-published URLs (added ones are already covered above).
+const changed = [...changedCandidates].filter((u) => current.has(u) && snapshot.has(u));
+
+// ── 4. submit the union, then persist the new snapshot ───────────────────────
+const removed = [...snapshot].filter((u) => !current.has(u));
+if (removed.length) console.log(`indexnow: ${removed.length} URL(s) no longer in sitemap (not auto-submitted): ${removed.join(', ')}`);
+
+const urlList = [...new Set([...added, ...changed])];
+
+if (bootstrap) {
+  console.log(`indexnow: no prior snapshot — bootstrapping. Announcing all ${urlList.length} published URL(s) once; future deploys submit only the delta.`);
+}
+
+if (urlList.length === 0) {
+  console.log('indexnow: no new or changed URLs to submit.');
+  // Snapshot already matches current (no added/removed) — nothing to persist.
+  if (removed.length && !DRY_RUN) writeSnapshot([...current]);
+  process.exit(0);
+}
+
+console.log(`indexnow: submitting ${urlList.length} URL(s):`);
+for (const u of urlList) console.log(`  ${u}`);
+
+if (DRY_RUN) {
+  console.log('indexnow: DRY_RUN set — not posting or writing snapshot.');
+  process.exit(0);
+}
+
+// Split into IndexNow's per-request limit so nothing is silently dropped (and
+// never recorded as submitted when it wasn't).
+const batches = [];
+for (let i = 0; i < urlList.length; i += MAX_URLS) batches.push(urlList.slice(i, i + MAX_URLS));
+
+for (let i = 0; i < batches.length; i++) {
+  const batch = batches[i];
+  let res;
+  try {
+    res = await fetch(ENDPOINT, {
+      method: 'POST',
+      headers: { 'content-type': 'application/json; charset=utf-8' },
+      body: JSON.stringify({ host: HOST, key: KEY, keyLocation: `${SITE_URL}/${KEY}.txt`, urlList: batch }),
+    });
+  } catch (err) {
+    fail(`could not reach IndexNow endpoint: ${err.message}`);
+  }
+  // 200 = accepted, 202 = accepted/validation pending. Both are success.
+  if (res.status !== 200 && res.status !== 202) {
+    const body = await res.text().catch(() => '');
+    fail(`endpoint returned ${res.status}: ${body}`);
+  }
+  console.log(`indexnow: batch ${i + 1}/${batches.length} ok (${res.status}, ${batch.length} URL(s)).`);
+}
+
+// Persist the authoritative current set only after every batch was accepted, so
+// nothing is marked submitted unless it actually was.
+writeSnapshot([...current]);