ticker: defensive ceiling on live-number values

src/components/live/live-number.tsx

@@ -28,11 +28,19 @@ export function LiveNumber({
   value,
   format,
   monotonic = false,
+  maxValue,
   className,
 }: {
   value: number | undefined;
   format: (n: number | undefined) => string;
   monotonic?: boolean;
+  /** Defensive ceiling. A single garbage push from the upstream relay
+   *  (observed: onchain vol24h briefly returning 8e79) would otherwise
+   *  latch into `lastRef` and, under `monotonic`, stick as the
+   *  displayed value forever because every subsequent healthy push is
+   *  smaller and gets rejected as a "down tick". Reject any incoming
+   *  value above the ceiling before it can pollute the snapshot pair. */
+  maxValue?: number;
   className?: string;
 }) {
   const [display, setDisplay] = useState<number | undefined>(value);
@@ -42,6 +50,16 @@ export function LiveNumber({
 
   useEffect(() => {
     if (value == null || !Number.isFinite(value)) return;
+    if (maxValue != null && value > maxValue) {
+      // Also flush a poisoned lastRef so a healthy value can seed the
+      // pair on the next push instead of being rejected by the
+      // monotonic guard against the stale garbage.
+      if (lastRef.current && lastRef.current.value > maxValue) {
+        lastRef.current = null;
+        prevRef.current = null;
+      }
+      return;
+    }
     const now = performance.now();
     // Only advance the snapshot pair on DISTINCT values. Consecutive pushes
     // with the same value (relay 1 Hz tick × lighthouse 1-5 min poll) would
@@ -53,7 +71,7 @@ export function LiveNumber({
     if (lastRef.current.value === value) return;
     prevRef.current = lastRef.current;
     lastRef.current = { value, ts: now };
-  }, [value]);
+  }, [value, maxValue]);
 
   useEffect(() => {
     let cancelled = false;

src/components/live/ticker.tsx

@@ -56,22 +56,30 @@ export const LiveTicker = memo(function LiveTicker({
         </span>
       </div>
 
+      {/* maxValue: defensive ceilings against upstream corruption. Real
+          world highs (crypto ATH): vol24h ~$500B, trades24h ~50M,
+          mcap ~$4T. Ceilings sit 20-100x above those to leave room for
+          plausible growth while catching the 10^20+ garbage tick that
+          latched the ticker at 8e79 on the home page on 2026-07-17. */}
       <Stat
         label="Onchain volume · 24h"
         value={stats?.vol24h}
         format={fmtMoneyFull}
         monotonic
+        maxValue={1e13}
       />
       <Stat
         label="Onchain txs · 24h"
         value={stats?.trades24h}
         format={fmtCountFull}
         monotonic
+        maxValue={1e10}
       />
       <Stat
         label="Total crypto mcap"
         value={stats?.mcap}
         format={fmtMoneyFull}
+        maxValue={1e14}
       />
 
       <button
@@ -90,11 +98,13 @@ function Stat({
   value,
   format,
   monotonic,
+  maxValue,
 }: {
   label: string;
   value: number | undefined;
   format: (n: number | undefined) => string;
   monotonic?: boolean;
+  maxValue?: number;
 }) {
   return (
     <div className="flex items-baseline gap-2 min-w-0">
@@ -103,6 +113,7 @@ function Stat({
         value={value}
         format={format}
         monotonic={monotonic}
+        maxValue={maxValue}
         className="font-sans tabular text-[12px] text-ink-soft"
       />
     </div>