diff --git a/src/app/(dashboard)/dashboard/usage/components/ProviderLimits/index.js b/src/app/(dashboard)/dashboard/usage/components/ProviderLimits/index.js
index 0090b7c6..45785c6f 100644
--- a/src/app/(dashboard)/dashboard/usage/components/ProviderLimits/index.js
+++ b/src/app/(dashboard)/dashboard/usage/components/ProviderLimits/index.js
@@ -1,6 +1,7 @@
 "use client";
 
 import { useState, useEffect, useCallback, useRef, useMemo } from "react";
+import { useSearchParams, useRouter, usePathname } from "next/navigation";
 import ProviderIcon from "@/shared/components/ProviderIcon";
 import QuotaTable from "./QuotaTable";
 import Toggle from "@/shared/components/Toggle";
@@ -152,6 +153,9 @@ function formatTimeRemaining(value) {
 
 export default function ProviderLimits() {
   const { copied, copy } = useCopyToClipboard();
+  const searchParams = useSearchParams();
+  const router = useRouter();
+  const pathname = usePathname();
   const [connections, setConnections] = useState([]);
   const [quotaData, setQuotaData] = useState({});
   const [loading, setLoading] = useState({});
@@ -171,7 +175,26 @@ export default function ProviderLimits() {
   const [showEditModal, setShowEditModal] = useState(false);
   const [selectedConnection, setSelectedConnection] = useState(null);
   const [proxyPools, setProxyPools] = useState([]);
-  const [providerFilter, setProviderFilter] = useState("all");
+  // Initialize providerFilter from URL ?provider= param so the page
+  // can be bookmarked / deep-linked to a specific provider (#4217).
+  const [providerFilter, _setProviderFilter] = useState(
+    () => searchParams?.get("provider") || "all"
+  );
+  // Wrapper: keeps URL in sync with the selected provider so the view can be
+  // bookmarked. Replaces the URL without adding to browser history.
+  const setProviderFilter = useCallback((value) => {
+    _setProviderFilter(value);
+    try {
+      const params = new URLSearchParams(searchParams?.toString() || "");
+      if (value === "all") {
+        params.delete("provider");
+      } else {
+        params.set("provider", value);
+      }
+      const newUrl = params.toString() ? `${pathname}?${params.toString()}` : pathname;
+      router.replace(newUrl, { scroll: false });
+    } catch { /* non-fatal: URL sync is best-effort */ }
+  }, [pathname, router, searchParams]);
   const [providerOptions, setProviderOptions] = useState([]);
   const [accountFilter, setAccountFilter] = useState("all");
   const [quotaSortMode, setQuotaSortMode] = useState("default");
diff --git a/tests/unit/quota-tracker-url-param.test.js b/tests/unit/quota-tracker-url-param.test.js
new file mode 100644
index 00000000..9baa5605
--- /dev/null
+++ b/tests/unit/quota-tracker-url-param.test.js
@@ -0,0 +1,53 @@
+/**
+ * Tests for #4217 — Quota Tracker URL ?provider= parameter support.
+ *
+ * Before this fix, visiting /dashboard/quota?provider=codex ignored the query
+ * parameter and always defaulted to "All providers". The dropdown selection
+ * updated only local state and did not update the URL.
+ *
+ * Fix: ProviderLimits initializes providerFilter from useSearchParams and
+ * wraps setProviderFilter to call router.replace when the filter changes.
+ *
+ * Because ProviderLimits is a JSX file we cannot import it in Vitest without
+ * a full Next.js setup. We verify the source text instead.
+ */
+
+import { describe, it, expect } from "vitest";
+import fs from "fs";
+import path from "path";
+
+const src = fs.readFileSync(
+  path.resolve("../src/app/(dashboard)/dashboard/usage/components/ProviderLimits/index.js"),
+  "utf-8"
+);
+
+describe("ProviderLimits — URL ?provider= sync (#4217)", () => {
+  it("imports useSearchParams from next/navigation", () => {
+    expect(src).toContain("useSearchParams");
+    expect(src).toContain("next/navigation");
+  });
+
+  it("imports useRouter from next/navigation", () => {
+    expect(src).toContain("useRouter");
+  });
+
+  it("imports usePathname from next/navigation", () => {
+    expect(src).toContain("usePathname");
+  });
+
+  it("initializes providerFilter from searchParams.get('provider')", () => {
+    expect(src).toMatch(/searchParams.*get.*provider/);
+  });
+
+  it("calls router.replace when provider filter changes", () => {
+    expect(src).toContain("router.replace");
+  });
+
+  it("removes ?provider from URL when 'all' is selected", () => {
+    expect(src).toContain("params.delete");
+  });
+
+  it("sets ?provider in URL when a specific provider is selected", () => {
+    expect(src).toContain('params.set("provider"');
+  });
+});
\ No newline at end of file