diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5dfa7fd5..20ca374c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,11 @@
 
 ## [Unreleased]
 
+## [v0.51.323] — 2026-06-07 — Release KM (7-day provider spend chart)
+
+### Added
+- **The Active Provider Quota card now shows a 7-day spend bar chart with a projected monthly pace** (OpenRouter). Daily spend deltas render as a small bar chart with a "Monthly pace" estimate; a graceful "not enough data yet" message shows until two daily snapshots exist. (#3600, @rodboev)
+
 ## [v0.51.322] — 2026-06-07 — Release KL (sortable + filterable markdown tables)
 
 ### Added
diff --git a/static/panels.js b/static/panels.js
index 87ab6080..6cc0abf6 100644
--- a/static/panels.js
+++ b/static/panels.js
@@ -6863,7 +6863,10 @@ async function loadProvidersPanel(){
     list.innerHTML='';
     _providerCardEls.clear();
     const quotaCard=_buildProviderQuotaCard(quota);
-    if(quotaCard) list.appendChild(quotaCard);
+    if(quotaCard){
+      list.appendChild(quotaCard);
+      renderProviderCostChart(quotaCard); // async, fire-and-forget
+    }
     if(providers.length===0){
       list.style.display='none';
       if(empty) empty.style.display='';
@@ -6899,6 +6902,10 @@ async function _refreshProviderQuota(card,button){
     const fresh=_buildProviderQuotaCard(next);
     if(fresh){
       card.replaceWith(fresh);
+      // Re-render the 7-day spend chart onto the rebuilt card — the quota
+      // refresh replaces the whole card, which would otherwise drop the chart
+      // until the next full panel reload (#3600).
+      renderProviderCostChart(fresh); // async, fire-and-forget
       if(typeof showToast==='function') showToast(failed?t('provider_quota_refresh_failed'):t('provider_quota_refresh_succeeded'));
       return;
     }
@@ -7125,6 +7132,43 @@ function _buildProviderQuotaCard(status){
   return card;
 }
 
+async function renderProviderCostChart(card){
+  let history;
+  try{
+    history=await api('/api/provider/cost-history?provider=openrouter');
+  }catch(e){
+    return; // silently skip if endpoint unavailable
+  }
+  const body=card.querySelector('.provider-quota-body');
+  if(!body||body.querySelector('.provider-cost-chart-wrap')) return;
+  if(!history||history.ok===false) return;
+  const snaps=Array.isArray(history.snapshots)?history.snapshots:[];
+  // need at least 2 snapshots to have one non-null delta
+  const hasData=snaps.filter(s=>s.delta!=null).length>=1;
+  if(!hasData){
+    const empty=document.createElement('div');
+    empty.className='provider-cost-chart-wrap';
+    empty.innerHTML='<div class="provider-cost-chart-title">7-day spend</div><div class="provider-quota-message">Not enough data yet. Cost chart builds after 2 daily snapshots.</div>';
+    body.appendChild(empty);
+    return;
+  }
+  const maxDelta=Math.max(...snaps.map(s=>s.delta!=null?Number(s.delta):0),1e-9);
+  const nonNull=snaps.filter(s=>s.delta!=null).map(s=>Number(s.delta));
+  const avg=nonNull.length?nonNull.reduce((a,b)=>a+b,0)/nonNull.length:0;
+  const pace='$'+(avg*30).toFixed(2);
+  const bars=snaps.map(s=>{
+    const delta=s.delta!=null?Number(s.delta):null;
+    const pct=delta!=null?Math.max((delta/maxDelta)*100,delta>0?2:0).toFixed(1):'0';
+    const label=String(s.date||'').slice(5);
+    const tip=delta!=null?`${s.date} · $${delta.toFixed(4)}`:`${s.date} · no baseline`;
+    return `<div class="insights-daily-bar" title="${esc(tip)}"><div class="insights-daily-stack" aria-label="${esc(tip)}"><div class="insights-daily-bar-input" style="height:${pct}%"></div></div><span>${esc(label)}</span></div>`;
+  }).join('');
+  const wrap=document.createElement('div');
+  wrap.className='provider-cost-chart-wrap';
+  wrap.innerHTML=`<div class="provider-cost-chart-title">7-day spend <span class="provider-cost-chart-pace">Monthly pace: ${esc(pace)}</span></div><div class="provider-cost-chart-bars insights-daily-token-chart">${bars}</div>`;
+  body.appendChild(wrap);
+}
+
 function _buildProviderCard(p){
   const card=document.createElement('div');
   card.className='provider-card';
diff --git a/static/style.css b/static/style.css
index aab17bd8..103c06a1 100644
--- a/static/style.css
+++ b/static/style.css
@@ -3853,6 +3853,10 @@ main.main > #mainPlugin{display:none;}
   .provider-quota-pool-row-head span{white-space:normal;}
   .provider-quota-pool-windows{grid-template-columns:1fr;}
 }
+.provider-cost-chart-wrap{width:100%;margin-top:12px;}
+.provider-cost-chart-title{font-size:11px;font-weight:650;color:var(--muted);margin-bottom:6px;display:flex;align-items:center;justify-content:space-between;gap:8px;}
+.provider-cost-chart-pace{font-weight:400;color:var(--text);}
+.provider-cost-chart-bars{height:80px;}
 .provider-card{
   border:1px solid var(--border);
   border-radius:12px;
diff --git a/tests/test_provider_cost_chart_ui.py b/tests/test_provider_cost_chart_ui.py
new file mode 100644
index 00000000..e41b6aed
--- /dev/null
+++ b/tests/test_provider_cost_chart_ui.py
@@ -0,0 +1,30 @@
+from __future__ import annotations
+
+from pathlib import Path
+
+
+REPO_ROOT = Path(__file__).resolve().parents[1]
+
+
+def test_provider_cost_chart_ui_guards_are_present():
+    panels_js = (REPO_ROOT / "static" / "panels.js").read_text(encoding="utf-8")
+    style_css = (REPO_ROOT / "static" / "style.css").read_text(encoding="utf-8")
+
+    # function is defined
+    assert "async function renderProviderCostChart(card)" in panels_js
+
+    # function is wired up inside loadProvidersPanel (fire-and-forget)
+    assert "renderProviderCostChart(quotaCard)" in panels_js
+
+    # fetch target is correct
+    assert "/api/provider/cost-history?provider=openrouter" in panels_js
+
+    # CSS container class present in both JS and CSS
+    assert "provider-cost-chart-wrap" in panels_js
+    assert "provider-cost-chart-wrap" in style_css
+
+    # monthly pace projection annotation
+    assert "Monthly pace" in panels_js
+
+    # null delta guard for the oldest snapshot
+    assert "s.delta!=null" in panels_js