perf(seo): OG cache + SSR home ticker + fee-compare JSON-LD

src/app/api/og/[slug]/route.tsx

@@ -129,7 +129,18 @@ export async function GET(
         </div>
       </div>
     ),
-    size,
+    {
+      ...size,
+      // Every social/AI unfurl used to trigger a full satori render
+      // (max-age=0 → x-vercel-cache MISS on consecutive GETs). The
+      // underlying data moves every 60s but a 1h-old card is fine for
+      // an unfurl; s-maxage bounds renders to ~24/day/slug while SWR
+      // keeps scrapes instant.
+      headers: {
+        "cache-control":
+          "public, s-maxage=3600, stale-while-revalidate=86400",
+      },
+    },
   );
 }
 

src/app/benchmarks/[slug]/opengraph-image.tsx

@@ -153,6 +153,6 @@ export default async function OG({
         </div>
       </div>
     ),
-    { ...size }
+    { ...size, headers: { "cache-control": "public, s-maxage=3600, stale-while-revalidate=86400" } }
   );
 }

src/app/benchmarks/[slug]/twitter-image.tsx

@@ -162,6 +162,6 @@ export default async function TwitterImage({
         </div>
       </div>
     ),
-    { ...size }
+    { ...size, headers: { "cache-control": "public, s-maxage=3600, stale-while-revalidate=86400" } }
   );
 }

src/app/fee-compare/page.tsx

@@ -1,6 +1,8 @@
 import type { Metadata } from "next";
 import { pageMetadata } from "@/lib/page-metadata";
 import { FeeCompareClient } from "@/components/fee-compare-client";
+import { buildBreadcrumbJsonLd, safeJsonLd } from "@/lib/jsonld";
+import { SITE } from "@/data/site";
 
 export const metadata: Metadata = pageMetadata({
   path: "/fee-compare",
@@ -26,8 +28,38 @@ export default async function FeeComparePage({
   const rawDays = parseInt(params.days ?? "90", 10);
   const initialDays = isFinite(rawDays) ? Math.min(180, Math.max(7, rawDays)) : 90;
 
+  // Only page on the site without JSON-LD until 2026-09: emit the same
+  // BreadcrumbList shape every hub page ships, plus a WebApplication
+  // node describing the comparison tool itself.
+  const jsonLd = {
+    "@context": "https://schema.org",
+    "@graph": [
+      buildBreadcrumbJsonLd([
+        { name: "Home", item: SITE.url },
+        { name: "Perp DEX fee comparison", item: `${SITE.url}/fee-compare` },
+      ]),
+      {
+        "@type": "WebApplication",
+        "@id": `${SITE.url}/fee-compare#app`,
+        name: "Perp DEX fee comparison",
+        url: `${SITE.url}/fee-compare`,
+        applicationCategory: "FinanceApplication",
+        operatingSystem: "Web",
+        offers: { "@type": "Offer", price: "0", priceCurrency: "USD" },
+        description:
+          "Compare taker fees between any two perp DEXs. Paste a wallet to see what was actually paid on Hyperliquid or Gains and what the same trades would have cost elsewhere.",
+        publisher: { "@id": `${SITE.url}/#org` },
+      },
+    ],
+  };
+
   return (
     <article className="mx-auto max-w-[720px] px-4 sm:px-6 py-10 sm:py-14">
+      <script
+        type="application/ld+json"
+        // biome-ignore lint/security/noDangerouslySetInnerHtml: serialized via safeJsonLd
+        dangerouslySetInnerHTML={{ __html: safeJsonLd(jsonLd) }}
+      />
       <p className="font-sans text-[11px] uppercase tracking-[0.18em] text-ink-faint mb-3">
         Fee comparison
       </p>

src/app/page.tsx

@@ -10,6 +10,44 @@ import { safeJsonLd } from "@/lib/jsonld";
 
 export const revalidate = 3600;
 
+/**
+ * Seed the live ticker with a real snapshot at ISR-regeneration time so
+ * the numbers exist in the cached HTML (most AI crawlers don't run JS
+ * and used to see dashes). Cost-neutral on Vercel: the fetch runs once
+ * per Data-Cache window (60s) shared across ALL visitors, never
+ * per-request — the page stays fully static/ISR. The client WebSocket
+ * takes over within seconds of hydration.
+ */
+async function fetchRelayStats(): Promise<
+  import("@/lib/live/types").GlobalView | null
+> {
+  try {
+    const res = await fetch("https://stream.openchainbench.com/stats", {
+      next: { revalidate: 60 },
+      signal: AbortSignal.timeout(3_000),
+    });
+    if (!res.ok) return null;
+    const d = (await res.json()) as { global?: Record<string, number> };
+    const g = d.global;
+    if (!g || typeof g.vol24h !== "number") return null;
+    return {
+      vol24h: g.vol24h,
+      trades24h: g.trades24h ?? 0,
+      buys24h: g.buys24h ?? 0,
+      sells24h: g.sells24h ?? 0,
+      fees24h: g.fees24h ?? 0,
+      mcap: g.mcap ?? 0,
+      byChain: [],
+      lighthouseAt: g.lighthouseAt ?? 0,
+      mcapAt: g.mcapAt ?? 0,
+    };
+  } catch {
+    // Relay unreachable at regeneration time: render the pre-existing
+    // dashes rather than fail the page.
+    return null;
+  }
+}
+
 const DESCRIPTION =
   "Live benchmarks for crypto infrastructure: RPC latency, bridge fees, L2 finality and price feed accuracy. Open methodology, updated continuously.";
 
@@ -34,6 +72,7 @@ export const metadata: Metadata = {
 
 export default async function HomePage() {
   const benchmarks = await getBenchmarksSafe();
+  const initialStats = await fetchRelayStats();
 
   // Same timestamp source the bench pages use for Dataset.dateModified:
   // the harness lastRunAt (real data timestamp, not build time). The
@@ -104,7 +143,7 @@ export default async function HomePage() {
             supported chains.
           </p>
         </header>
-        <LiveDashboard />
+        <LiveDashboard initialStats={initialStats} />
       </section>
 
       {/* Latest deployed benchmarks */}

src/app/reports/[category]/[slug]/opengraph-image.tsx

@@ -114,6 +114,6 @@ export default async function OG({
         </div>
       </div>
     ),
-    { ...size }
+    { ...size, headers: { "cache-control": "public, s-maxage=3600, stale-while-revalidate=86400" } }
   );
 }

src/components/live/dashboard.tsx

@@ -108,8 +108,16 @@ function emptySeries(): SeriesByRange {
   };
 }
 
-export function LiveDashboard() {
-  const [stats, setStats] = useState<GlobalView | null>(null);
+export function LiveDashboard({
+  initialStats = null,
+}: {
+  /** Server-fetched snapshot of the relay's /stats global block, baked
+   *  into the ISR HTML so crawlers (most AI bots don't run JS) see real
+   *  ticker numbers instead of dashes. The WebSocket replaces it within
+   *  seconds of hydration. */
+  initialStats?: GlobalView | null;
+} = {}) {
+  const [stats, setStats] = useState<GlobalView | null>(initialStats);
   const [recent, setRecent] = useState<SwapEvent[]>([]);
   const [connected, setConnected] = useState(false);
   const [series, setSeries] = useState<SeriesByRange>(emptySeries);