diff --git a/src/components/benchmark-body.tsx b/src/components/benchmark-body.tsx
index 0798befe..5c32bac5 100644
--- a/src/components/benchmark-body.tsx
+++ b/src/components/benchmark-body.tsx
@@ -1,7 +1,7 @@
 "use client";
 
 import { useSearchParams } from "next/navigation";
-import { useEffect, useMemo, useState } from "react";
+import { useCallback, useEffect, useMemo, useState } from "react";
 import type { Benchmark } from "@/types/benchmark";
 import { liveResults } from "@/lib/provider-filters";
 import { matchesChainSlug } from "@/lib/chain-aliases";
@@ -29,6 +29,7 @@ import { computeFieldStats } from "@/lib/stats";
 import { defaultViewFor, viewsForBenchmark } from "@/lib/views";
 import { useViewPreference } from "@/hooks/use-view-preference";
 import type { ChainMeta } from "@/components/chain-tabs";
+import { FileText, Check } from "lucide-react";
 
 type ChainOption = { value: string; label: string };
 
@@ -136,6 +137,50 @@ const REGION_DISPLAY: Record<string, string> = {
   global: "Global",
 };
 
+function CsvButton({ benchmark }: { benchmark: Benchmark }) {
+  const [done, setDone] = useState(false);
+
+  const onClick = useCallback(() => {
+    const series = benchmark.extras?.series24h;
+    if (!series || Object.keys(series).length === 0) return;
+    const slugs = benchmark.results.map((r) => r.slug);
+    const nPoints = 72;
+    const stepMs = (24 * 3_600_000) / nPoints;
+    const now = Date.now();
+    const header = ["timestamp", ...slugs].join(",");
+    const rows = Array.from({ length: nPoints }, (_, i) => {
+      const ts = new Date(now - 24 * 3_600_000 + (i + 1) * stepMs).toISOString();
+      return [ts, ...slugs.map((s) => { const v = series[s]?.[i]; return v == null ? "" : String(v); })].join(",");
+    });
+    const blob = new Blob([[header, ...rows].join("\n")], { type: "text/csv" });
+    const url = URL.createObjectURL(blob);
+    const a = document.createElement("a");
+    a.href = url;
+    a.download = `openchainbench-${benchmark.slug}-24h.csv`;
+    a.rel = "noopener";
+    document.body.appendChild(a);
+    a.click();
+    document.body.removeChild(a);
+    setTimeout(() => URL.revokeObjectURL(url), 4000);
+    setDone(true);
+    setTimeout(() => setDone(false), 1600);
+  }, [benchmark]);
+
+  if (!benchmark.extras?.series24h || Object.keys(benchmark.extras.series24h).length === 0) return null;
+
+  return (
+    <button
+      type="button"
+      onClick={onClick}
+      className="inline-flex items-center gap-1.5 rounded-md border border-ink/15 bg-paper px-2 py-1 text-ink shadow-sm transition-colors hover:bg-paper-soft"
+      title="Download chart data as CSV (24 h)"
+      aria-label="Download CSV"
+    >
+      {done ? <Check size={11} strokeWidth={2.4} /> : <FileText size={11} strokeWidth={2} />}
+    </button>
+  );
+}
+
 export function BenchmarkBody({
   variants,
   chainOptions,
@@ -578,6 +623,14 @@ export function BenchmarkBody({
     };
   }, [viewBenchmark, activePanel]);
 
+  const sharedHeaderActions = (
+    <>
+      <CsvButton benchmark={viewBenchmark ?? benchmark} />
+      {pageActions}
+      <ViewSwitcher allowed={allowedViews} value={view} onChange={setView} />
+    </>
+  );
+
   return (
     <>
       {(hasLayerSplit ||
@@ -733,7 +786,7 @@ export function BenchmarkBody({
               {view === "countLeaderboard" && (
                 <CountLeaderboard
                   benchmark={viewBenchmark}
-                  headerActions={<>{pageActions}<ViewSwitcher allowed={allowedViews} value={view} onChange={setView} /></>}
+                  headerActions={<>{sharedHeaderActions}</>}
                 />
               )}
               {view === "rankedBar" && (
@@ -758,7 +811,7 @@ export function BenchmarkBody({
                   onResetExcluded={resetExcluded}
                   disableTopN={hasLayerSplit}
                   topNControl={topNControl}
-                  headerActions={<>{pageActions}<ViewSwitcher allowed={allowedViews} value={view} onChange={setView} /></>}
+                  headerActions={<>{sharedHeaderActions}</>}
                 />
                 </>
               )}
@@ -770,7 +823,7 @@ export function BenchmarkBody({
                   onResetExcluded={resetExcluded}
                   disableTopN={hasLayerSplit}
                   topNControl={topNControl}
-                  headerActions={<>{pageActions}<ViewSwitcher allowed={allowedViews} value={view} onChange={setView} /></>}
+                  headerActions={<>{sharedHeaderActions}</>}
                 />
               )}
               {view === "donut" && (
@@ -780,7 +833,7 @@ export function BenchmarkBody({
                   onToggleExclude={toggleExclude}
                   disableTopN={hasLayerSplit}
                   topNControl={topNControl}
-                  headerActions={<>{pageActions}<ViewSwitcher allowed={allowedViews} value={view} onChange={setView} /></>}
+                  headerActions={<>{sharedHeaderActions}</>}
                 />
               )}
               {view === "timeseries" && (
@@ -813,7 +866,7 @@ export function BenchmarkBody({
                     onResetExcluded={resetExcluded}
                     disableTopN={hasLayerSplit}
                   topNControl={topNControl}
-                    headerActions={<>{pageActions}<ViewSwitcher allowed={allowedViews} value={view} onChange={setView} /></>}
+                    headerActions={<>{sharedHeaderActions}</>}
                     seriesOverride={activePanel?.seriesByProvider}
                     seriesOverride7d={activePanel?.seriesByProvider7d}
                     seriesOverride30d={activePanel?.seriesByProvider30d}
diff --git a/src/components/chart-export-button.tsx b/src/components/chart-export-button.tsx
index 47478bdc..5705f3c0 100644
--- a/src/components/chart-export-button.tsx
+++ b/src/components/chart-export-button.tsx
@@ -19,9 +19,11 @@
  */
 
 import { useCallback, useState } from "react";
-import { Copy, Download, Check, Loader2 } from "lucide-react";
+import { Copy, Download, Check, Loader2, FileText } from "lucide-react";
 import { toBlob } from "html-to-image";
 
+type CsvLine = { slug: string; name: string; values: (number | null)[] };
+
 type Props = {
   /** Ref to the element to capture. Should include chart + watermark. */
   targetRef: import("react").RefObject<HTMLElement | null>;
@@ -29,6 +31,12 @@ type Props = {
   filename?: string;
   /** Optional class to tweak wrapper size. */
   className?: string;
+  /** When provided, shows a CSV download button. */
+  csvLines?: CsvLine[];
+  /** Total hours the series spans (used to back-fill timestamps). */
+  rangeHours?: number;
+  /** Expected number of points in each series. */
+  rangePoints?: number;
 };
 
 const PIXEL_RATIO = 2; // Retina-quality PNG for legible screenshots.
@@ -37,10 +45,14 @@ export function ChartExportButton({
   targetRef,
   filename = "openchainbench-chart",
   className = "",
+  csvLines,
+  rangeHours = 24,
+  rangePoints,
 }: Props) {
   const [state, setState] = useState<
     "idle" | "working" | "copied" | "downloaded" | "error"
   >("idle");
+  const [csvState, setCsvState] = useState<"idle" | "done">("idle");
 
   const capture = useCallback(async (): Promise<Blob | null> => {
     const el = targetRef.current;
@@ -121,6 +133,35 @@ export function ChartExportButton({
     }
   }, [capture, filename]);
 
+  const onDownloadCsv = useCallback(() => {
+    if (!csvLines || csvLines.length === 0) return;
+    const now = Date.now();
+    const rangeMs = rangeHours * 3_600_000;
+    const nPoints = rangePoints ?? csvLines[0]?.values.length ?? 72;
+    const stepMs = rangeMs / nPoints;
+    const header = ["timestamp", ...csvLines.map((l) => l.name)].join(",");
+    const rows = (csvLines[0]?.values ?? []).map((_, i) => {
+      const ts = new Date(now - rangeMs + (i + 1) * stepMs).toISOString();
+      const vals = csvLines.map((l) => {
+        const v = l.values[i];
+        return v == null ? "" : String(v);
+      });
+      return [ts, ...vals].join(",");
+    });
+    const blob = new Blob([[header, ...rows].join("\n")], { type: "text/csv" });
+    const url = URL.createObjectURL(blob);
+    const a = document.createElement("a");
+    a.href = url;
+    a.download = `${filename}.csv`;
+    a.rel = "noopener";
+    document.body.appendChild(a);
+    a.click();
+    document.body.removeChild(a);
+    setTimeout(() => URL.revokeObjectURL(url), 4000);
+    setCsvState("done");
+    setTimeout(() => setCsvState("idle"), 1600);
+  }, [csvLines, rangeHours, rangePoints, filename]);
+
   return (
     <span
       data-chart-export-button="true"
@@ -154,7 +195,7 @@ export function ChartExportButton({
         type="button"
         onClick={onDownload}
         disabled={state === "working"}
-        className="inline-flex items-center gap-1.5 rounded-r-md px-2 py-1 text-ink transition-colors hover:bg-paper-soft disabled:opacity-60"
+        className={`inline-flex items-center gap-1.5 px-2 py-1 text-ink transition-colors hover:bg-paper-soft disabled:opacity-60 ${csvLines && csvLines.length > 0 ? "" : "rounded-r-md"}`}
         title="Download chart as PNG"
         aria-label="Download chart as PNG"
       >
@@ -164,6 +205,24 @@ export function ChartExportButton({
           <Download size={11} strokeWidth={2} />
         )}
       </button>
+      {csvLines && csvLines.length > 0 && (
+        <>
+          <span aria-hidden className="h-4 w-px bg-ink/15" />
+          <button
+            type="button"
+            onClick={onDownloadCsv}
+            className="inline-flex items-center gap-1.5 rounded-r-md px-2 py-1 text-ink transition-colors hover:bg-paper-soft"
+            title="Download chart data as CSV"
+            aria-label="Download chart data as CSV"
+          >
+            {csvState === "done" ? (
+              <Check size={11} strokeWidth={2.4} />
+            ) : (
+              <FileText size={11} strokeWidth={2} />
+            )}
+          </button>
+        </>
+      )}
     </span>
   );
 }