diff --git a/docs/api/sponsorship-requests.md b/docs/api/sponsorship-requests.md
new file mode 100644
index 0000000..f1982a0
--- /dev/null
+++ b/docs/api/sponsorship-requests.md
@@ -0,0 +1,17 @@
+# Sponsorship config requests (#546)
+
+## Current behaviour
+
+- The dashboard home fetches sponsorship configs for the visible wallets in batches of five
+  (`SPONSORSHIP_CONCURRENCY`).
+- The global sponsorship page already batches its requests in groups of five
+  (`CONFIG_CONCURRENCY`).
+
+Both still send one request per wallet, so the count grows with the number of wallets. Batching
+only limits how many run at once.
+
+## Fix that needs the backend
+
+Return `sponsorship` with each wallet in the wallet list response, or add
+`GET /v1/sponsorship?wallet_ids=...`. The client then makes a constant number of requests per
+page.
diff --git a/src/app/dashboard/layout.tsx b/src/app/dashboard/layout.tsx
index eb3250a..34d9e92 100644
--- a/src/app/dashboard/layout.tsx
+++ b/src/app/dashboard/layout.tsx
@@ -1,4 +1,5 @@
 import type { Metadata } from "next";
+import { AuthProvider } from "@/lib/useAuth";
 
 export const dynamic = "force-dynamic";
 
@@ -14,5 +15,5 @@ export const metadata: Metadata = {
 };
 
 export default function DashboardLayout({ children }: { children: React.ReactNode }) {
-  return children;
+  return <AuthProvider>{children}</AuthProvider>;
 }
\ No newline at end of file
diff --git a/src/app/dashboard/page.tsx b/src/app/dashboard/page.tsx
index bc08db4..2ecfca8 100644
--- a/src/app/dashboard/page.tsx
+++ b/src/app/dashboard/page.tsx
@@ -18,6 +18,9 @@ import { ErrorState } from "@/components/dashboard/WalletUI";
 
 export const dynamic = "force-dynamic";
 
+// How many sponsorship configs to request at once for a page of wallets.
+const SPONSORSHIP_CONCURRENCY = 5;
+
 export default function DashboardHome() {
   const { user, token, loading, logout } = useAuth();
   const [wallets, setWallets] = useState<WalletView[] | null>(null);
@@ -49,9 +52,15 @@ export default function DashboardHome() {
           setWallets(page.data);
           setNextCursor(page.next_cursor);
           // Fetch sponsorship configs for the visible page in parallel.
-          const results = await Promise.allSettled(
-            page.data.map((w) => getSponsorshipConfig(asAuthToken(token), asWalletId(w.id))),
-          );
+          const results: PromiseSettledResult<SponsorshipConfig>[] = [];
+          for (let i = 0; i < page.data.length; i += SPONSORSHIP_CONCURRENCY) {
+            const batch = page.data.slice(i, i + SPONSORSHIP_CONCURRENCY);
+            results.push(
+              ...(await Promise.allSettled(
+                batch.map((w) => getSponsorshipConfig(asAuthToken(token), asWalletId(w.id))),
+              )),
+            );
+          }
           if (aborted) return;
           const map = new Map<string, SponsorshipConfig | null>();
           page.data.forEach((w, i) => {
diff --git a/src/components/dashboard/DashboardShell.tsx b/src/components/dashboard/DashboardShell.tsx
index 415a840..4397931 100644
--- a/src/components/dashboard/DashboardShell.tsx
+++ b/src/components/dashboard/DashboardShell.tsx
@@ -6,6 +6,8 @@ import { DashboardBackground } from "./DashboardBackground";
 import { IdleLock } from "./IdleLock";
 import { network } from "@/lib/network";
 import type { User } from "@/lib/auth";
+import { useEffect, useState } from "react";
+import { usePathname } from "next/navigation";
 
 /** Dashboard chrome: network banner, idle-warning banner, sidebar, topbar, content. */
 export function DashboardShell({
@@ -21,6 +23,14 @@ export function DashboardShell({
   blockNavigation?: (href: string) => boolean;
   children: React.ReactNode;
 }) {
+  const pathname = usePathname();
+  const [menuOpen, setMenuOpen] = useState(false);
+
+  // Close the mobile menu after navigating.
+  useEffect(() => {
+    setMenuOpen(false);
+  }, [pathname]);
+
   return (
     <div className="relative flex min-h-screen flex-col bg-background">
       <DashboardBackground />
@@ -37,12 +47,35 @@ export function DashboardShell({
       )}
 
       <div className="relative z-10 flex flex-1">
-        <Sidebar user={user} blockNavigation={blockNavigation} />
+        <Sidebar user={user} blockNavigation={blockNavigation} className="hidden lg:flex" />
+        {menuOpen && (
+          <>
+            <div
+              aria-hidden="true"
+              className="fixed inset-0 z-20 bg-black/40 lg:hidden"
+              onClick={() => setMenuOpen(false)}
+            />
+            <div className="fixed inset-y-0 left-0 z-30 lg:hidden">
+              <Sidebar user={user} blockNavigation={blockNavigation} className="h-full" />
+            </div>
+          </>
+        )}
 
         <div className="flex flex-1 flex-col">
           {/* topbar */}
-          <header className="flex items-center justify-between border-b border-border px-8 py-4">
-            <h1 className="text-lg font-semibold text-foreground">{title}</h1>
+          <header className="flex items-center justify-between gap-3 border-b border-border px-4 py-4 sm:px-8">
+            <div className="flex min-w-0 items-center gap-3">
+              <button
+                type="button"
+                onClick={() => setMenuOpen(true)}
+                aria-label="Open menu"
+                aria-expanded={menuOpen}
+                className="rounded-md p-2 text-muted hover:bg-hover hover:text-foreground lg:hidden"
+              >
+                <span aria-hidden="true">☰</span>
+              </button>
+              <h1 className="truncate text-lg font-semibold text-foreground">{title}</h1>
+            </div>
             <div className="flex items-center gap-4">
               <button
                 onClick={onLogout}
@@ -54,7 +87,7 @@ export function DashboardShell({
             </div>
           </header>
 
-          <main className="flex-1 px-8 py-8">
+          <main className="flex-1 px-4 py-8 sm:px-8">
             <div className="mx-auto w-full max-w-6xl">
               <Parallax speed={28}>{children}</Parallax>
             </div>
diff --git a/src/components/dashboard/Sidebar.tsx b/src/components/dashboard/Sidebar.tsx
index 47b2ccf..40d64f1 100644
--- a/src/components/dashboard/Sidebar.tsx
+++ b/src/components/dashboard/Sidebar.tsx
@@ -33,15 +33,18 @@ const NAV: {
 export function Sidebar({
   user,
   blockNavigation,
+  className,
 }: {
   user?: User | null;
   /** Returns true to cancel a nav click (e.g. while unsaved one-time secrets are shown). */
   blockNavigation?: (href: string) => boolean;
+  /** Extra classes, e.g. to hide the sidebar on small screens. */
+  className?: string;
 }) {
   const pathname = usePathname();
 
   return (
-    <aside className="flex w-64 shrink-0 flex-col border-r border-border bg-surface-sunken px-3 py-5">
+    <aside className={`flex w-64 shrink-0 flex-col border-r border-border bg-surface-sunken px-3 py-5 ${className ?? ""}`}>
       <div className="px-3">
         <Logo />
         <p className="mt-5 text-sm font-medium text-foreground">
diff --git a/src/lib/api.ts b/src/lib/api.ts
index 09fa8e8..b5feafc 100644
--- a/src/lib/api.ts
+++ b/src/lib/api.ts
@@ -71,7 +71,7 @@ export async function apiFetch<T>(
       ...rest,
       signal,
       headers: {
-        "content-type": "application/json",
+        ...(rest.body !== undefined ? { "content-type": "application/json" } : {}),
         ...(token ? { authorization: `Bearer ${token}` } : {}),
         ...headers,
       },
diff --git a/src/lib/useAuth.ts b/src/lib/useAuth.ts
index 259478d..4446e18 100644
--- a/src/lib/useAuth.ts
+++ b/src/lib/useAuth.ts
@@ -1,6 +1,6 @@
 "use client";
 
-import { useEffect, useRef, useState } from "react";
+import { createContext, createElement, useContext, useEffect, useRef, useState, type ReactNode } from "react";
 import { useRouter, usePathname } from "next/navigation";
 import { toast } from "sonner";
 import { ApiError } from "./api";
@@ -25,7 +25,7 @@ const MIN_LOADING_MS = 700;
  *  2. 401 from any apiFetch → "session-expired" CustomEvent.
  *  3. Another tab removing octo_token → storage event.
  */
-export function useAuth() {
+function useAuthSession() {
   const router = useRouter();
   const pathname = usePathname();
   const [user, setUser] = useState<User | null>(null);
@@ -139,6 +139,26 @@ export function useAuth() {
   return { user, token, loading, authError, retrySessionCheck, logout };
 }
 
+type AuthSession = ReturnType<typeof useAuthSession>;
+
+const AuthContext = createContext<AuthSession | null>(null);
+
+/**
+ * Runs the session check once for the dashboard. Mounted in the dashboard layout, so
+ * navigating between pages reuses the result instead of calling `me()` again.
+ */
+export function AuthProvider({ children }: { children: ReactNode }) {
+  const session = useAuthSession();
+  return createElement(AuthContext.Provider, { value: session }, children);
+}
+
+/** The shared session from AuthProvider. Dashboard pages always render inside it. */
+export function useAuth(): AuthSession {
+  const session = useContext(AuthContext);
+  if (!session) throw new Error("useAuth must be used inside AuthProvider");
+  return session;
+}
+
 export function isAuthenticationFailure(err: unknown): boolean {
   return err instanceof ApiError && (err.status === 401 || err.status === 403);
 }