diff --git a/app/main.py b/app/main.py
index c0472e1..a41397d 100644
--- a/app/main.py
+++ b/app/main.py
@@ -121,6 +121,22 @@ async def api_model_usage(request: Request):
         return JSONResponse({"error": e.detail}, status_code=e.status_code)
 
 
+@app.get("/api/metrics")
+async def api_metrics(request: Request, days: int = 730):
+    """Daily metrics series from the portal (members + usage history).
+
+    The portal owns this data (metrics_daily, refreshed 03:15 UTC); the panel
+    only reads it. Fetched once at the widest range and sliced client-side, so
+    the period toggle never refetches.
+    """
+    if not is_admin(request):
+        return JSONResponse({"error": "forbidden"}, status_code=403)
+    try:
+        return await portal_get(f"/admin/metrics/series?days={max(1, min(int(days), 730))}")
+    except HTTPException as e:
+        return JSONResponse({"error": e.detail}, status_code=e.status_code)
+
+
 @app.post("/api/set-balance")
 async def api_set_balance(request: Request):
     if not is_admin(request):
@@ -254,6 +270,18 @@ PAGE_HTML = """<!DOCTYPE html>
   .pill.inactive { background: #f6e9e5; color: var(--danger); }
   .pill.manual { background: #f1e8da; color: #a97a4a; }
   .pill.org { background: #e7edf5; color: #4a6a8a; }
+  /* Trends tab (charts). Colours come from the same vars as the rest of the
+     panel; the SVG is inline so there is no chart library and no CDN. */
+  .trend-controls { display: flex; gap: 22px; flex-wrap: wrap; margin: 14px 0 0; }
+  .trend-controls .range-group { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; }
+  .trend-card { background: #fff; border: 1px solid var(--border); border-radius: 12px; padding: 14px 16px 12px; margin-top: 12px; }
+  .trend-head { display: flex; align-items: baseline; gap: 10px; flex-wrap: wrap; margin-bottom: 8px; }
+  .trend-title { font-weight: 700; font-size: 14px; color: var(--ink); }
+  .trend-sub { color: var(--muted); font-size: 12px; }
+  .trend-body svg { display: block; width: 100%; height: auto; overflow: visible; }
+  .trend-note { color: var(--muted); font-size: 12px; margin: 6px 0 0; }
+  .trend-empty { color: var(--muted); font-size: 13px; margin: 28px 0; text-align: center; }
+  @media (max-width: 600px) { .trend-controls { gap: 10px; } .trend-card { padding: 12px 10px; } }
   .num { font-variant-numeric: tabular-nums; }
   .remaining-col { font-weight: 700; color: var(--green-deep); background: #eaf3ea; }
   .flash { padding: 12px 16px; border-radius: 8px; margin: 16px 0; font-size: 14px; display: none; }
@@ -306,6 +334,7 @@ PAGE_HTML = """<!DOCTYPE html>
     <h2 id="view-title">Members</h2>
     <button class="tab-btn active" id="tab-members" onclick="switchView('members')">Members</button>
     <button class="tab-btn" id="tab-models" onclick="switchView('models')">Model usage</button>
+    <button class="tab-btn" id="tab-trends" onclick="switchView('trends')">Trends</button>
     <span class="range-group" id="member-mode-group">
       <button class="range-btn active" id="mmode-balance" onclick="setMemberMode('balance')">Balance</button>
       <button class="range-btn" id="mmode-all" onclick="setMemberMode('all')">All time</button>
@@ -337,6 +366,31 @@ PAGE_HTML = """<!DOCTYPE html>
   </table>
   </div>
 
+  <div id="trends-section" style="display:none;">
+    <div class="trend-controls">
+      <span class="range-group">
+        <span class="range-label">Show</span>
+        <button class="range-btn active" id="tm-members" onclick="setTrendMetric('members')">Members</button>
+        <button class="range-btn" id="tm-spend" onclick="setTrendMetric('spend')">Spend</button>
+        <button class="range-btn" id="tm-requests" onclick="setTrendMetric('requests')">Requests</button>
+      </span>
+      <span class="range-group">
+        <span class="range-label">Period</span>
+        <button class="range-btn" id="tr-30" onclick="setTrendDays(30)">Last 30 days</button>
+        <button class="range-btn active" id="tr-90" onclick="setTrendDays(90)">Last 90 days</button>
+        <button class="range-btn" id="tr-all" onclick="setTrendDays(0)">All time</button>
+      </span>
+    </div>
+    <div class="trend-card">
+      <div class="trend-head">
+        <span class="trend-title" id="trend-title">Members</span>
+        <span class="trend-sub" id="trend-sub"></span>
+      </div>
+      <div id="trend-body" class="trend-body"><p class="trend-empty">Loading</p></div>
+      <p class="trend-note" id="trend-note"></p>
+    </div>
+  </div>
+
   <div id="admins-section" style="display:none;">
     <h3 style="margin:20px 0 8px;">Admin</h3>
     <p style="color:var(--muted);font-size:12px;margin:0 0 8px;">Operator accounts (SSO owner and bot). Not members — excluded from member counts; their usage is a collective expense.</p>
@@ -413,6 +467,141 @@ async function load() {
   }
 }
 
+// ---- Trends (members + usage over time) ----
+// Data comes from the portal, which owns it: metrics_daily is written by a
+// 03:15 UTC scheduler task inside the portal app. Fetched once at the widest
+// range; the metric and period toggles re-render client-side without refetching.
+let trendsData = null;
+let trendMetric = "members";   // members | spend | requests
+let trendDays = 90;            // 0 = all time
+
+const TREND_CONF = {
+  members:  { kind: "line", title: "Members",          unit: "count",
+              note: "Cumulative members as of each day. A gap means days that were never measured, not zero members." },
+  spend:    { kind: "bar",  title: "Spend per day",     unit: "money",
+              note: "Spend charged to the co-op that day. Days with no recorded usage are gaps, not zeroes." },
+  requests: { kind: "bar",  title: "Requests per day",  unit: "count",
+              note: "Gateway requests served that day. Days with no recorded usage are gaps, not zeroes." }
+};
+
+async function loadMetrics() {
+  if (trendsData) { renderTrends(); return; }
+  const host = $("trend-body");
+  try {
+    const r = await fetch("/api/metrics?days=730");
+    if (r.status === 403) { host.innerHTML = "<p class=trend-empty>Forbidden</p>"; return; }
+    const d = await r.json();
+    if (d.error) { host.innerHTML = "<p class=trend-empty>" + d.error + "</p>"; return; }
+    trendsData = d.series || [];
+    renderTrends();
+  } catch (e) {
+    host.innerHTML = "<p class=trend-empty>Could not load trends</p>";
+  }
+}
+
+function setTrendMetric(m) {
+  trendMetric = m;
+  $("tm-members").className = "range-btn" + (m === "members" ? " active" : "");
+  $("tm-spend").className = "range-btn" + (m === "spend" ? " active" : "");
+  $("tm-requests").className = "range-btn" + (m === "requests" ? " active" : "");
+  renderTrends();
+}
+
+function setTrendDays(d) {
+  trendDays = d;
+  $("tr-30").className = "range-btn" + (d === 30 ? " active" : "");
+  $("tr-90").className = "range-btn" + (d === 90 ? " active" : "");
+  $("tr-all").className = "range-btn" + (d === 0 ? " active" : "");
+  renderTrends();
+}
+
+function trendVal(row) {
+  if (trendMetric === "members") return row.members_total;
+  if (trendMetric === "spend") return row.spend_usd;
+  return row.requests;
+}
+
+function trendLabel(v) {
+  if (v === null || v === undefined) return "not measured";
+  if (trendMetric === "spend") return fmt(v);
+  return Number(v).toLocaleString();
+}
+
+function renderTrends() {
+  const host = $("trend-body");
+  if (!host || !trendsData) return;
+  const conf = TREND_CONF[trendMetric];
+  const rows = trendDays === 0 ? trendsData : trendsData.slice(-trendDays);
+  $("trend-title").textContent = conf.title;
+  $("trend-note").textContent = conf.note;
+
+  const vals = rows.map(trendVal);
+  const have = vals.filter(v => v !== null && v !== undefined);
+  if (have.length < 2) {
+    host.innerHTML = "<p class=trend-empty>Not enough history yet.</p>";
+    $("trend-sub").textContent = "";
+    return;
+  }
+  const gaps = vals.length - have.length;
+  const maxV = Math.max.apply(null, have);
+  const top = maxV <= 0 ? 1 : maxV * 1.08;   // headroom so the peak clears the frame
+
+  const W = 1000, H = 250, padL = 62, padR = 14, padT = 14, padB = 30;
+  const plotW = W - padL - padR, plotH = H - padT - padB;
+  const baseY = padT + plotH;
+  const n = vals.length;
+  const xAt = i => padL + (n <= 1 ? plotW / 2 : (plotW * i) / (n - 1));
+  const yAt = v => baseY - (plotH * v) / top;
+  const parts = [];
+
+  parts.push('<svg viewBox="0 0 ' + W + ' ' + H + '" role="img" aria-label="' + conf.title + ' over time">');
+  for (let g = 0; g <= 4; g++) {
+    const yy = baseY - (plotH * g) / 4;
+    const lab = trendLabel((top * g) / 4);
+    parts.push('<line x1="' + padL + '" y1="' + yy + '" x2="' + (W - padR) + '" y2="' + yy + '" stroke="var(--border)"/>');
+    parts.push('<text x="' + (padL - 8) + '" y="' + (yy + 4) + '" text-anchor="end" font-size="11" fill="var(--muted)">' + lab + '</text>');
+  }
+
+  if (conf.kind === "bar") {
+    const bw = Math.max(1, plotW / n - 1);
+    for (let i = 0; i < n; i++) {
+      const v = vals[i];
+      if (v === null || v === undefined) continue;
+      const yy = yAt(v);
+      parts.push('<rect x="' + (xAt(i) - bw / 2) + '" y="' + yy + '" width="' + bw + '" height="' + Math.max(0.6, baseY - yy) + '" fill="var(--green-mid)"><title>' + rows[i].day + ": " + trendLabel(v) + "</title></rect>");
+    }
+  } else {
+    // Break the line into contiguous measured runs: a gap stays a gap.
+    const runs = [];
+    let run = [];
+    for (let i = 0; i < n; i++) {
+      if (vals[i] === null || vals[i] === undefined) { if (run.length) runs.push(run); run = []; }
+      else run.push(i);
+    }
+    if (run.length) runs.push(run);
+    for (let s = 0; s < runs.length; s++) {
+      const r0 = runs[s];
+      const pts = r0.map(i => xAt(i) + "," + yAt(vals[i])).join(" ");
+      parts.push('<path d="M' + xAt(r0[0]) + "," + baseY + " L" + r0.map(i => xAt(i) + "," + yAt(vals[i])).join(" L") + " L" + xAt(r0[r0.length - 1]) + "," + baseY + ' Z" fill="var(--green-deep)" fill-opacity="0.10"/>');
+      parts.push('<polyline points="' + pts + '" fill="none" stroke="var(--green-deep)" stroke-width="2" stroke-linejoin="round"/>');
+    }
+    for (let i = 0; i < n; i++) {
+      if (vals[i] === null || vals[i] === undefined) continue;
+      parts.push('<circle cx="' + xAt(i) + '" cy="' + yAt(vals[i]) + '" r="7" fill="transparent"><title>' + rows[i].day + ": " + trendLabel(vals[i]) + "</title></circle>");
+    }
+  }
+
+  const marks = n > 2 ? [0, Math.floor((n - 1) / 2), n - 1] : [0, n - 1];
+  for (let mi = 0; mi < marks.length; mi++) {
+    const i = marks[mi];
+    const anchor = mi === 0 ? "start" : (mi === marks.length - 1 ? "end" : "middle");
+    parts.push('<text x="' + xAt(i) + '" y="' + (H - 9) + '" text-anchor="' + anchor + '" font-size="11" fill="var(--muted)">' + String(rows[i].day).slice(5) + '</text>');
+  }
+  parts.push("</svg>");
+  host.innerHTML = parts.join("");
+  $("trend-sub").textContent = rows.length + " days" + (gaps > 0 ? " - " + gaps + " not measured" : "");
+}
+
 // ---- shared state ----
 let membersData = [];
 let adminsData = [];
@@ -445,12 +634,16 @@ function switchView(view) {
   // The Admin section is a members-view category; hide it in the Models view
   // (model usage already integrates admin spend into the totals).
   $('admins-section').style.display = view === 'members' ? '' : 'none';
+  $('trends-section').style.display = view === 'trends' ? '' : 'none';
   $('tab-members').className = 'tab-btn' + (view === 'members' ? ' active' : '');
   $('tab-models').className = 'tab-btn' + (view === 'models' ? ' active' : '');
-  $('view-title').textContent = view === 'members' ? 'Members' : 'Model usage';
+  $('tab-trends').className = 'tab-btn' + (view === 'trends' ? ' active' : '');
+  $('view-title').textContent = view === 'members' ? 'Members' : (view === 'models' ? 'Model usage' : 'Trends');
   // Mode groups: Balance/All-time for members; Period for models.
   $('range-group').style.display = view === 'models' ? '' : 'none';
   $('member-mode-group').style.display = view === 'members' ? '' : 'none';
+  // Trends renders on first visit only, so the panel's initial load stays fast.
+  if (view === 'trends') loadMetrics();
   render();
 }