diff --git a/backend/src/lib/handlers/arsenal.ts b/backend/src/lib/handlers/arsenal.ts
new file mode 100644
index 0000000..22c92e1
--- /dev/null
+++ b/backend/src/lib/handlers/arsenal.ts
@@ -0,0 +1,81 @@
+import { route, HandlerContext, HttpError } from '@/lib/router';
+import { getDb } from '@/lib/db';
+
+route('player/:steamId/arsenal_loadouts', ['GET'], (ctx: HandlerContext) => {
+  const db = getDb();
+  const rows = db.prepare('SELECT * FROM arsenal_loadouts WHERE steam_id = ?').all(ctx.params.steamId);
+  const loadouts: Record<string, any> = {};
+  for (const r of rows as any[]) {
+    loadouts[r.hero_name] = JSON.parse(r.loadout);
+  }
+  return { arsenal_loadouts: loadouts };
+});
+
+route('player/:steamId/arsenal_loadouts', ['PUT'], (ctx: HandlerContext) => {
+  const { arsenal_loadouts } = ctx.body as any;
+  if (!arsenal_loadouts) throw new HttpError(400, 'arsenal_loadouts required');
+  const db = getDb();
+  const upsert = db.prepare(`
+    INSERT INTO arsenal_loadouts (steam_id, hero_name, loadout, updated_at) VALUES (?, ?, ?, datetime('now'))
+    ON CONFLICT(steam_id, hero_name) DO UPDATE SET loadout = ?, updated_at = datetime('now')
+  `);
+  const tx = db.transaction(() => {
+    for (const [hero, loadout] of Object.entries(arsenal_loadouts)) {
+      upsert.run(ctx.params.steamId, hero, JSON.stringify(loadout), JSON.stringify(loadout));
+    }
+  });
+  tx();
+  return { success: true };
+});
+
+route('player/:steamId/arsenal_inventory', ['GET'], (ctx: HandlerContext) => {
+  const db = getDb();
+  const items = db.prepare('SELECT * FROM arsenal_inventory WHERE steam_id = ?').all(ctx.params.steamId);
+  const instances: Record<string, any> = {};
+  for (const item of items as any[]) {
+    instances[item.instance_id] = {
+      instanceId: item.instance_id,
+      itemName: item.item_name,
+      quality: item.quality,
+      upgradeLevel: item.upgrade_level,
+      serial: item.serial,
+      globalSerial: item.global_serial,
+      ownerName: item.owner_name,
+      pinned: !!item.pinned,
+      favorite: !!item.favorite,
+      stats: JSON.parse(item.stats || '[]'),
+    };
+  }
+  return { arsenal_inventory: { instances } };
+});
+
+route('player/:steamId/arsenal_inventory', ['PUT'], (ctx: HandlerContext) => {
+  const { arsenal_inventory } = ctx.body as any;
+  if (!arsenal_inventory || !arsenal_inventory.instances) throw new HttpError(400, 'arsenal_inventory.instances required');
+  const db = getDb();
+  const upsert = db.prepare(`
+    INSERT INTO arsenal_inventory (steam_id, instance_id, item_name, quality, upgrade_level, serial, global_serial, owner_name, pinned, favorite, stats)
+    VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
+    ON CONFLICT(steam_id, instance_id) DO UPDATE SET
+      item_name = excluded.item_name, quality = excluded.quality, upgrade_level = excluded.upgrade_level,
+      serial = excluded.serial, global_serial = excluded.global_serial, owner_name = excluded.owner_name,
+      pinned = excluded.pinned, favorite = excluded.favorite, stats = excluded.stats
+  `);
+  const tx = db.transaction(() => {
+    for (const [instId, inst] of Object.entries(arsenal_inventory.instances)) {
+      const i = inst as any;
+      upsert.run(ctx.params.steamId, instId,
+        i.itemName || i.item_name || '',
+        i.quality || 'common',
+        i.upgradeLevel || i.upgrade_level || 0,
+        i.serial || 0,
+        i.globalSerial || i.global_serial || 0,
+        i.ownerName || i.owner_name || '',
+        i.pinned ? 1 : 0,
+        i.favorite ? 1 : 0,
+        JSON.stringify(i.stats || []));
+    }
+  });
+  tx();
+  return { success: true };
+});
diff --git a/backend/src/lib/handlers/contracts.ts b/backend/src/lib/handlers/contracts.ts
new file mode 100644
index 0000000..f8e7eb7
--- /dev/null
+++ b/backend/src/lib/handlers/contracts.ts
@@ -0,0 +1,18 @@
+import { route, HandlerContext, HttpError } from '@/lib/router';
+import { getDb } from '@/lib/db';
+
+route('player/:steamId/death_sentence_contracts', ['GET'], (ctx: HandlerContext) => {
+  const db = getDb();
+  const row = db.prepare('SELECT contracts FROM death_sentence_contracts WHERE steam_id = ?').get(ctx.params.steamId) as any;
+  return { death_sentence_contracts: row ? JSON.parse(row.contracts) : { roster: [] } };
+});
+
+route('player/:steamId/death_sentence_contracts', ['PUT'], (ctx: HandlerContext) => {
+  const { death_sentence_contracts } = ctx.body as any;
+  const db = getDb();
+  db.prepare(`
+    INSERT INTO death_sentence_contracts (steam_id, contracts, updated_at) VALUES (?, ?, datetime('now'))
+    ON CONFLICT(steam_id) DO UPDATE SET contracts = ?, updated_at = datetime('now')
+  `).run(ctx.params.steamId, JSON.stringify(death_sentence_contracts || {}), JSON.stringify(death_sentence_contracts || {}));
+  return { success: true };
+});
diff --git a/backend/src/lib/handlers/marketplace.ts b/backend/src/lib/handlers/marketplace.ts
new file mode 100644
index 0000000..7dca778
--- /dev/null
+++ b/backend/src/lib/handlers/marketplace.ts
@@ -0,0 +1,56 @@
+import { route, HandlerContext, HttpError } from '@/lib/router';
+import { getDb } from '@/lib/db';
+
+route('arsenal_market/listings', ['GET'], (ctx: HandlerContext) => {
+  const db = getDb();
+  return db.prepare("SELECT * FROM arsenal_market_listings WHERE status = 'active' ORDER BY created_at DESC").all();
+});
+
+route('player/:steamId/arsenal_market/my_listings', ['GET'], (ctx: HandlerContext) => {
+  const db = getDb();
+  return db.prepare("SELECT * FROM arsenal_market_listings WHERE steam_id = ? AND status = 'active' ORDER BY created_at DESC").all(ctx.params.steamId);
+});
+
+route('player/:steamId/arsenal_market/slots', ['GET'], (ctx: HandlerContext) => {
+  return { slots: 5, used: 0 };
+});
+
+route('player/:steamId/arsenal_market/sales', ['GET'], (ctx: HandlerContext) => {
+  const db = getDb();
+  return db.prepare('SELECT * FROM arsenal_market_sales WHERE seller_steam_id = ? ORDER BY created_at DESC').all(ctx.params.steamId);
+});
+
+route('player/:steamId/arsenal_market/create', ['POST'], (ctx: HandlerContext) => {
+  const { instance_id, item_name, quality, upgrade_level, serial, global_serial, price_free } = ctx.body as any;
+  const listingId = `list_${Date.now()}_${Math.floor(Math.random() * 1000)}`;
+  const db = getDb();
+  db.prepare(`
+    INSERT INTO arsenal_market_listings (listing_id, steam_id, instance_id, item_name, quality, upgrade_level, serial, global_serial, price_free, status)
+    VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, 'active')
+  `).run(listingId, ctx.params.steamId, instance_id || '', item_name || 'Unknown', quality || 'common',
+    upgrade_level || 0, serial || 0, global_serial || 0, price_free || 0);
+  return { success: true, listing_id: listingId };
+});
+
+route('player/:steamId/arsenal_market/buy', ['POST'], (ctx: HandlerContext) => {
+  const { listing_id } = ctx.body as any;
+  if (!listing_id) throw new HttpError(400, 'listing_id required');
+  const db = getDb();
+  const listing = db.prepare('SELECT * FROM arsenal_market_listings WHERE listing_id = ?').get(listing_id) as any;
+  if (!listing) throw new HttpError(404, 'Listing not found');
+  if (listing.status !== 'active') throw new HttpError(400, 'Listing not active');
+
+  db.prepare("UPDATE arsenal_market_listings SET status = 'sold' WHERE listing_id = ?").run(listing_id);
+  db.prepare('INSERT INTO arsenal_market_sales (listing_id, seller_steam_id, buyer_steam_id, item_name, price_free) VALUES (?, ?, ?, ?, ?)')
+    .run(listing_id, listing.steam_id, ctx.params.steamId, listing.item_name, listing.price_free);
+  return { success: true };
+});
+
+route('player/:steamId/arsenal_market/cancel', ['POST'], (ctx: HandlerContext) => {
+  const { listing_id } = ctx.body as any;
+  if (!listing_id) throw new HttpError(400, 'listing_id required');
+  const db = getDb();
+  db.prepare("UPDATE arsenal_market_listings SET status = 'cancelled' WHERE listing_id = ? AND steam_id = ?")
+    .run(listing_id, ctx.params.steamId);
+  return { success: true };
+});