diff --git a/apps/web/package.json b/apps/web/package.json
index df9adf8..12052bb 100644
--- a/apps/web/package.json
+++ b/apps/web/package.json
@@ -20,6 +20,7 @@
     "@simplewebauthn/browser": "^13.2.0",
     "hono": "^4.10.3",
     "@profullstack/nichedb": "workspace:*",
-    "@nichedb/enrichers": "workspace:*"
+    "@nichedb/enrichers": "workspace:*",
+    "@profullstack/leaderboard": "^0.3.0"
   }
 }
diff --git a/apps/web/src/app.js b/apps/web/src/app.js
index bfb67fa..e7929f5 100644
--- a/apps/web/src/app.js
+++ b/apps/web/src/app.js
@@ -1,6 +1,7 @@
 import { config } from '@nichedb/config';
 import { Hono } from 'hono';
 import { isProUser, loadUser, render, wantsJson } from './lib/http.js';
+import { leaderboard } from './lib/leaderboard.js';
 import { modulesFor, withModules } from './lib/modules.js';
 import { gateway, gatewayFor } from './lib/pricing.js';
 import { Denied } from './lib/service.js';
@@ -45,6 +46,16 @@ app.use('*', async (c, next) => {
 
 app.use('*', loadUser);
 
+/**
+ * The public board: partners earning on one side, agents spending on the
+ * other, kept apart. Serves its own pages, JSON, RSS, per-player share cards
+ * and the embed widget under /leaderboard.
+ */
+app.use('*', async (c, next) => {
+  const answer = await leaderboard.handle(c.req.raw);
+  return answer ?? next();
+});
+
 /** Ads and tracking: on for free, off for Pro, the buyer's choice with a pass. */
 app.use('*', async (c, next) => {
   const modules = await modulesFor(c, isProUser);
diff --git a/apps/web/src/lib/leaderboard.js b/apps/web/src/lib/leaderboard.js
new file mode 100644
index 0000000..17f28af
--- /dev/null
+++ b/apps/web/src/lib/leaderboard.js
@@ -0,0 +1,161 @@
+import { config } from '@nichedb/config';
+import { sql } from '@nichedb/db';
+import { createLeaderboard, projectionStore } from '@profullstack/leaderboard';
+
+/**
+ * The public board, over rows we already keep.
+ *
+ * Nothing here is written by the leaderboard. Crawl passes land in
+ * `crawl_sales` because an agent paid the gateway, and referral commissions
+ * land in `referral_usages` because someone's code was spent. Both are
+ * ledgers. A board that copied them would be a second ledger that disagrees
+ * with the first one the day a write fails, so we project instead.
+ *
+ * Badges are the exception. They are awarded at a moment rather than derived
+ * from a sum, so they get a table (`leaderboard_badges`, migration 0005).
+ */
+
+const ms = (v) => (v instanceof Date ? v.getTime() : new Date(v).getTime());
+
+/**
+ * Two methods, written against the tagged-template client we already use, so
+ * the board needs no second database handle and no string-built SQL.
+ */
+const badges = {
+  async awardBadge(player, badge) {
+    const rows = await sql`
+      insert into leaderboard_badges (player, badge) values (${player}, ${badge})
+      on conflict (player, badge) do nothing
+      returning player`;
+    return rows.length > 0;
+  },
+  async badges() {
+    const rows = await sql`select player, badge, awarded_at from leaderboard_badges`;
+    const out = {};
+    for (const r of rows) {
+      out[r.player] ??= {};
+      out[r.player][r.badge] = ms(r.awarded_at);
+    }
+    return out;
+  },
+};
+
+/**
+ * A buyer's identity is the wallet that paid; its display name is the agent,
+ * because "meta-externalagent" tells a reader something and `0x46E9…6C79`
+ * does not. A sale with neither is skipped rather than pooled into one
+ * "unknown" row, which would outrank every real buyer on the board.
+ */
+const KNOWN_AGENTS = [
+  'meta-externalagent',
+  'GPTBot',
+  'ClaudeBot',
+  'anthropic-ai',
+  'CCBot',
+  'Bytespider',
+  'Applebot',
+  'FacebookBot',
+  'Lightpanda',
+  'PerplexityBot',
+];
+function agentName(userAgent) {
+  const ua = String(userAgent ?? '');
+  const known = KNOWN_AGENTS.find((k) => ua.toLowerCase().includes(k.toLowerCase()));
+  return known ?? (ua.slice(0, 40).trim() || null);
+}
+
+/** A wallet address is long and all of it is public; show the ends. */
+const shortWallet = (p) => (p.length > 14 ? `${p.slice(0, 6)}…${p.slice(-4)}` : p);
+
+async function events({ since }) {
+  const from = new Date(since || 0);
+  const [sales, referrals] = await Promise.all([
+    sql`select payer, user_agent, total_cents, days, created_at
+        from crawl_sales
+        where created_at >= ${from}`,
+    // display_name or handle only. An email address is not a public name, and
+    // this page is public.
+    sql`select u.affiliate_id, u.commission_cents, u.applied_at,
+               coalesce(a.display_name, a.handle::text) as name
+        from referral_usages u
+        join users a on a.id = u.affiliate_id
+        where u.applied_at >= ${from}`,
+  ]);
+
+  const out = [];
+  for (const s of sales) {
+    const player = s.payer || agentName(s.user_agent);
+    if (!player) continue;
+    const at = ms(s.created_at);
+    const name = agentName(s.user_agent) ?? shortWallet(String(player));
+    const each = (metric, delta) => out.push({ player: String(player), name, metric, delta, at });
+    each('spent', Number(s.total_cents) || 0);
+    each('passes', 1);
+    each('days', Number(s.days) || 1);
+  }
+  for (const r of referrals) {
+    const at = ms(r.applied_at);
+    // A partner who set no display name is shown by a stable short id, never
+    // by the email they signed up with.
+    const name = r.name || `Partner ${String(r.affiliate_id).slice(0, 8)}`;
+    const each = (metric, delta) =>
+      out.push({ player: String(r.affiliate_id), name, metric, delta, at });
+    each('earned', Number(r.commission_cents) || 0);
+    each('referrals', 1);
+  }
+  return out;
+}
+
+export const leaderboard = createLeaderboard({
+  siteName: config.siteName,
+  siteUrl: config.siteUrl,
+  basePath: '/leaderboard',
+  store: projectionStore({ events, badges }),
+  // Two sides of one marketplace, never in one list: a partner earning $209
+  // and an agent spending $209 are not the same fact about NicheDB.
+  sides: { sell: 'Partners earning', buy: 'Agents spending', use: 'Crawl usage' },
+  boards: {
+    earners: {
+      label: 'Top earners',
+      metric: 'earned',
+      format: 'usd',
+      unit: 'Earned',
+      side: 'sell',
+      actor: 'Partner',
+    },
+    referrers: {
+      label: 'Most referrals',
+      metric: 'referrals',
+      format: 'integer',
+      unit: 'Referrals',
+      side: 'sell',
+      actor: 'Partner',
+    },
+    spenders: {
+      label: 'Biggest spenders',
+      metric: 'spent',
+      format: 'usd',
+      unit: 'Spent',
+      side: 'buy',
+      actor: 'Agent',
+    },
+    passes: {
+      label: 'Most passes bought',
+      metric: 'passes',
+      format: 'integer',
+      unit: 'Passes',
+      side: 'buy',
+      actor: 'Agent',
+    },
+    days: {
+      label: 'Most days of access',
+      metric: 'days',
+      format: 'integer',
+      unit: 'Days',
+      side: 'use',
+      actor: 'Agent',
+    },
+  },
+  ladder: true,
+  cacheMs: 60_000,
+});
diff --git a/apps/web/src/lib/pricing.js b/apps/web/src/lib/pricing.js
index 31c63ca..79f8b96 100644
--- a/apps/web/src/lib/pricing.js
+++ b/apps/web/src/lib/pricing.js
@@ -99,7 +99,20 @@ export function gatewayOptions(priceCents) {
     passMinutes: config.x402.passMinutes,
     maxDays: config.x402.maxDays,
     contact: config.x402.contact || undefined,
-    openPaths: ['/llms.txt', '/mcp', '/api/', '/healthz', '/manifest.webmanifest'],
+    // The leaderboard is open on purpose, and both spellings are needed: the
+    // gateway prefix-matches only entries ending in a slash, so '/leaderboard'
+    // alone would open the index and still charge for every board on it. It is
+    // the public record of who pays for this data, and an agent that hits a 402
+    // on the page ranking it cannot read the case for buying a pass.
+    openPaths: [
+      '/llms.txt',
+      '/mcp',
+      '/api/',
+      '/healthz',
+      '/manifest.webmanifest',
+      '/leaderboard',
+      '/leaderboard/',
+    ],
     onSale: async (sale) => {
       console.log('[x402] sold a pass', {
         payer: sale.payer,
diff --git a/bun.lock b/bun.lock
index fef83a1..79a9f8d 100644
--- a/bun.lock
+++ b/bun.lock
@@ -29,6 +29,7 @@
         "@nichedb/notify": "workspace:*",
         "@nichedb/payments": "workspace:*",
         "@nichedb/queue": "workspace:*",
+        "@profullstack/leaderboard": "^0.3.0",
         "@profullstack/nichedb": "workspace:*",
         "@profullstack/x402-gateway": "^0.1.0",
         "@simplewebauthn/browser": "^13.2.0",
@@ -296,6 +297,8 @@
 
     "@profullstack/favicon-generator": ["@profullstack/favicon-generator@1.2.1", "", { "dependencies": { "inquirer": "^10.2.2", "sharp": "^0.33.5" }, "bin": { "fav": "bin/cli.js" } }, "sha512-1w+EcoEmi60TXXQd97Brs7kN/BmlaoOcNvE39ZombUWSCBFBNe6fFm2mA7HORXb7TM39mHklNTIoG20glLsgVA=="],
 
+    "@profullstack/leaderboard": ["@profullstack/leaderboard@0.3.0", "", {}, "sha512-SKPmIqhmrAhFQqHl9wJHV1NzJHUCNBsqWc1F6M5AeFfphXWGfKSmgeCC3QN37JH/cQ1NxS8kYC/DqbjQqNBoaQ=="],
+
     "@profullstack/nichedb": ["@profullstack/nichedb@workspace:apps/cli"],
 
     "@profullstack/referrals": ["@profullstack/referrals@0.1.0", "", { "peerDependencies": { "react": ">=18" }, "optionalPeers": ["react"] }, "sha512-u66SdBVpsv3kc0N+NWISPoYD5vjCERyv5wfD07iSkZwQeC2IA+ihX5jNA4e7Xr+Y4AUvxLycG+3b4VaROqzgRg=="],
diff --git a/packages/db/migrations/0005_leaderboard_badges.sql b/packages/db/migrations/0005_leaderboard_badges.sql
new file mode 100644
index 0000000..7b2d2ba
--- /dev/null
+++ b/packages/db/migrations/0005_leaderboard_badges.sql
@@ -0,0 +1,12 @@
+-- Badges for the public leaderboard (@profullstack/leaderboard).
+--
+-- Everything else the board shows is projected live out of crawl_sales and
+-- referral_usages, so it has no tables of its own. Badges are the exception:
+-- they are awarded at a moment and then kept, so "top ten this week" still
+-- reads as earned after the week ends. That fact lives nowhere else.
+create table if not exists leaderboard_badges (
+  player     text        not null,
+  badge      text        not null,
+  awarded_at timestamptz not null default now(),
+  primary key (player, badge)
+);