diff --git a/SVSim.EmulatedEntrypoint/Controllers/PackController.cs b/SVSim.EmulatedEntrypoint/Controllers/PackController.cs
index 98f7984..1f97f0c 100644
--- a/SVSim.EmulatedEntrypoint/Controllers/PackController.cs
+++ b/SVSim.EmulatedEntrypoint/Controllers/PackController.cs
@@ -9,6 +9,7 @@ using SVSim.EmulatedEntrypoint.Models.Dtos;
 using SVSim.EmulatedEntrypoint.Models.Dtos.Requests;
 using SVSim.EmulatedEntrypoint.Models.Dtos.Requests.Pack;
 using SVSim.EmulatedEntrypoint.Models.Dtos.Responses.Pack;
+using SVSim.Database.Services;
 using SVSim.EmulatedEntrypoint.Services;
 
 namespace SVSim.EmulatedEntrypoint.Controllers;
@@ -29,6 +30,8 @@ public class PackController : SVSimController
     private readonly SVSimDbContext _db;
     private readonly ICardAcquisitionService _acquisition;
     private readonly IGachaPointService _gachaPoint;
+    private readonly ICurrencySpendService _spend;
+    private readonly IViewerEntitlements _entitlements;
 
     public PackController(
         IPackRepository packs,
@@ -37,7 +40,9 @@ public class PackController : SVSimController
         IRandom rng,
         SVSimDbContext db,
         ICardAcquisitionService acquisition,
-        IGachaPointService gachaPoint)
+        IGachaPointService gachaPoint,
+        ICurrencySpendService spend,
+        IViewerEntitlements entitlements)
     {
         _packs = packs;
         _opener = opener;
@@ -46,6 +51,8 @@ public class PackController : SVSimController
         _db = db;
         _acquisition = acquisition;
         _gachaPoint = gachaPoint;
+        _spend = spend;
+        _entitlements = entitlements;
     }
 
     [HttpPost("info")]
@@ -292,18 +299,16 @@ public class PackController : SVSimController
             {
                 case 2:   // CRYSTAL_MULTI
                 {
-                    ulong cost = (ulong)child.Cost * (ulong)packNumber;
-                    if (viewer.Currency.Crystals < cost)
-                        return BadRequest(new { error = "insufficient_crystals" });
-                    viewer.Currency.Crystals -= cost;
+                    long cost = (long)child.Cost * packNumber;
+                    var r = await _spend.TrySpendAsync(viewer, SpendCurrency.Crystal, cost);
+                    if (!r.Success) return BadRequest(new { error = "insufficient_crystals" });
                     break;
                 }
                 case 7:   // RUPY_MULTI
                 {
-                    ulong cost = (ulong)child.Cost * (ulong)packNumber;
-                    if (viewer.Currency.Rupees < cost)
-                        return BadRequest(new { error = "insufficient_rupees" });
-                    viewer.Currency.Rupees -= cost;
+                    long cost = (long)child.Cost * packNumber;
+                    var r = await _spend.TrySpendAsync(viewer, SpendCurrency.Rupee, cost);
+                    if (!r.Success) return BadRequest(new { error = "insufficient_rupees" });
                     break;
                 }
                 case 3:   // DAILY single — once per UTC day
@@ -315,10 +320,9 @@ public class PackController : SVSimController
                     if (existing?.LastDailyFreeAt is DateTime last && last.Date == now.Date)
                         return BadRequest(new { error = "daily_free_already_claimed" });
 
-                    ulong cost = (ulong)child.Cost * (ulong)packNumber;
-                    if (cost > 0 && viewer.Currency.Rupees < cost)
-                        return BadRequest(new { error = "insufficient_rupees" });
-                    if (cost > 0) viewer.Currency.Rupees -= cost;
+                    long cost = (long)child.Cost * packNumber;
+                    var r = await _spend.TrySpendAsync(viewer, SpendCurrency.Rupee, cost);
+                    if (!r.Success) return BadRequest(new { error = "insufficient_rupees" });
                     break;
                 }
             }
@@ -359,14 +363,13 @@ public class PackController : SVSimController
         // Currency reward entries only apply to purchasable packs; tutorial path omits them.
         if (!isTutorialPath)
         {
-            var postViewer = await _db.Viewers.FirstAsync(v => v.Id == viewerId);
             if (child.TypeDetail == 2)
             {
-                rewardList.Add(new RewardListEntry { RewardType = 2, RewardId = 0, RewardNum = (int)postViewer.Currency.Crystals });
+                rewardList.Add(new RewardListEntry { RewardType = 2, RewardId = 0, RewardNum = (int)_entitlements.EffectiveBalance(viewer, SpendCurrency.Crystal) });
             }
             else if (child.TypeDetail == 7 || child.TypeDetail == 3)
             {
-                rewardList.Add(new RewardListEntry { RewardType = 9, RewardId = 0, RewardNum = (int)postViewer.Currency.Rupees });
+                rewardList.Add(new RewardListEntry { RewardType = 9, RewardId = 0, RewardNum = (int)_entitlements.EffectiveBalance(viewer, SpendCurrency.Rupee) });
             }
         }
         rewardList.AddRange(grant.RewardList);
diff --git a/SVSim.UnitTests/Controllers/PackControllerOpenTests.cs b/SVSim.UnitTests/Controllers/PackControllerOpenTests.cs
index 5c2f2b2..f0ca05d 100644
--- a/SVSim.UnitTests/Controllers/PackControllerOpenTests.cs
+++ b/SVSim.UnitTests/Controllers/PackControllerOpenTests.cs
@@ -524,6 +524,25 @@ public class PackControllerOpenTests
         Assert.That(v.GachaPointBalances.Single().Points, Is.EqualTo(3));
     }
 
+    [Test]
+    public async Task Open_freeplay_succeeds_with_zero_balance_and_no_deduction()
+    {
+        using var factory = new SVSimTestFactory();
+        long viewerId = await factory.SeedViewerAsync();
+        await SeedOpenablePack(factory, viewerId, rupees: 0);   // broke, but freeplay
+        await factory.EnableFreeplayAsync();
+
+        using var client = factory.CreateAuthenticatedClient(viewerId);
+        var json = """{"viewer_id":"0","steam_id":0,"steam_session_ticket":"","parent_gacha_id":10001,"gacha_id":400002,"gacha_type":1,"pack_number":1,"exclude_card_ids":[]}""";
+        var response = await client.PostAsync("/pack/open", JsonBody(json));
+        Assert.That(response.StatusCode, Is.EqualTo(HttpStatusCode.OK), await response.Content.ReadAsStringAsync());
+
+        using var scope = factory.Services.CreateScope();
+        var db = scope.ServiceProvider.GetRequiredService<SVSimDbContext>();
+        var v = await db.Viewers.FirstAsync(x => x.Id == viewerId);
+        Assert.That(v.Currency.Rupees, Is.EqualTo(0UL), "freeplay must not deduct real DB balance");
+    }
+
     [Test]
     public async Task TutorialPackOpen_does_not_accrue_gacha_points()
     {