diff --git a/tests/SIGCM2.Api.Tests/Products/ProductPricesControllerTests.cs b/tests/SIGCM2.Api.Tests/Products/ProductPricesControllerTests.cs
index cad6079..1b111db 100644
--- a/tests/SIGCM2.Api.Tests/Products/ProductPricesControllerTests.cs
+++ b/tests/SIGCM2.Api.Tests/Products/ProductPricesControllerTests.cs
@@ -304,6 +304,102 @@ public sealed class ProductPricesControllerTests : IAsyncLifetime
         paged!.Page.Should().Be(1, "page=0 must be clamped to 1");
     }
 
+    /// <summary>§P.4 boundary — pageSize=100 exacto → no clamping, boundary inclusivo.</summary>
+    [Fact]
+    public async Task GetPrices_PageSize100_Exact_Returns200()
+    {
+        var productId = await SeedProductAsync();
+        // Seed 3 prices — all but the last have explicit PVT
+        for (var i = 1; i <= 3; i++)
+        {
+            var pvt = i < 3 ? (DateOnly?)new DateOnly(2026, 1, i) : null;
+            await SeedPriceDirectAsync(productId, i * 10m, new DateOnly(2026, 1, i), pvt);
+        }
+
+        var token = GetAdminToken();
+        using var req = BuildRequest(
+            HttpMethod.Get, $"/api/v1/products/{productId}/prices?pageSize=100", token: token);
+        var resp = await _client.SendAsync(req);
+
+        resp.StatusCode.Should().Be(HttpStatusCode.OK);
+        var paged = await resp.Content.ReadFromJsonAsync<PagedResult<ProductPriceDto>>();
+        paged.Should().NotBeNull();
+        paged!.PageSize.Should().Be(100, "pageSize=100 is the upper boundary — must NOT be clamped further");
+        paged.Items.Should().HaveCount(3);
+    }
+
+    /// <summary>§P.4 boundary — pageSize=101 → clamp to 100.</summary>
+    [Fact]
+    public async Task GetPrices_PageSize101_ClampsTo100()
+    {
+        var productId = await SeedProductAsync();
+        await SeedPriceDirectAsync(productId, 50m, new DateOnly(2026, 2, 1), null);
+
+        var token = GetAdminToken();
+        using var req = BuildRequest(
+            HttpMethod.Get, $"/api/v1/products/{productId}/prices?pageSize=101", token: token);
+        var resp = await _client.SendAsync(req);
+
+        resp.StatusCode.Should().Be(HttpStatusCode.OK);
+        var paged = await resp.Content.ReadFromJsonAsync<PagedResult<ProductPriceDto>>();
+        paged.Should().NotBeNull();
+        paged!.PageSize.Should().Be(100, "pageSize=101 must be clamped to 100");
+    }
+
+    /// <summary>§P.4 boundary — pageSize=1000 → clamp to 100.</summary>
+    [Fact]
+    public async Task GetPrices_PageSize1000_ClampsTo100()
+    {
+        var productId = await SeedProductAsync();
+        await SeedPriceDirectAsync(productId, 75m, new DateOnly(2026, 3, 1), null);
+
+        var token = GetAdminToken();
+        using var req = BuildRequest(
+            HttpMethod.Get, $"/api/v1/products/{productId}/prices?pageSize=1000", token: token);
+        var resp = await _client.SendAsync(req);
+
+        resp.StatusCode.Should().Be(HttpStatusCode.OK);
+        var paged = await resp.Content.ReadFromJsonAsync<PagedResult<ProductPriceDto>>();
+        paged.Should().NotBeNull();
+        paged!.PageSize.Should().Be(100, "pageSize=1000 must be clamped to max 100");
+    }
+
+    /// <summary>§P.5 boundary — page=-5 → clamp to 1.</summary>
+    [Fact]
+    public async Task GetPrices_PageNegative_ClampsToOne()
+    {
+        var productId = await SeedProductAsync();
+        await SeedPriceDirectAsync(productId, 120m, new DateOnly(2026, 4, 1), null);
+
+        var token = GetAdminToken();
+        using var req = BuildRequest(
+            HttpMethod.Get, $"/api/v1/products/{productId}/prices?page=-5", token: token);
+        var resp = await _client.SendAsync(req);
+
+        resp.StatusCode.Should().Be(HttpStatusCode.OK);
+        var paged = await resp.Content.ReadFromJsonAsync<PagedResult<ProductPriceDto>>();
+        paged.Should().NotBeNull();
+        paged!.Page.Should().Be(1, "page=-5 must be clamped to 1");
+    }
+
+    /// <summary>§P.4 boundary — pageSize=0 → clamp to 1 (minimum).</summary>
+    [Fact]
+    public async Task GetPrices_PageSizeZero_ClampsToOne()
+    {
+        var productId = await SeedProductAsync();
+        await SeedPriceDirectAsync(productId, 90m, new DateOnly(2026, 5, 1), null);
+
+        var token = GetAdminToken();
+        using var req = BuildRequest(
+            HttpMethod.Get, $"/api/v1/products/{productId}/prices?pageSize=0", token: token);
+        var resp = await _client.SendAsync(req);
+
+        resp.StatusCode.Should().Be(HttpStatusCode.OK);
+        var paged = await resp.Content.ReadFromJsonAsync<PagedResult<ProductPriceDto>>();
+        paged.Should().NotBeNull();
+        paged!.PageSize.Should().Be(1, "pageSize=0 must be clamped to minimum 1");
+    }
+
     /// <summary>§P.7 — Producto inexistente → 404.</summary>
     [Fact]
     public async Task GetPrices_ProductNotFound_Returns404()
diff --git a/tests/SIGCM2.Application.Tests/Products/Repository/ProductPriceRepositoryIntegrationTests.cs b/tests/SIGCM2.Application.Tests/Products/Repository/ProductPriceRepositoryIntegrationTests.cs
index e029c6e..215bd2c 100644
--- a/tests/SIGCM2.Application.Tests/Products/Repository/ProductPriceRepositoryIntegrationTests.cs
+++ b/tests/SIGCM2.Application.Tests/Products/Repository/ProductPriceRepositoryIntegrationTests.cs
@@ -440,6 +440,77 @@ public class ProductPriceRepositoryIntegrationTests : IAsyncLifetime
         page2.Total.Should().Be(6);
     }
 
+    // §B3.2 — 30 prices: page 1 and page 2 (pageSize=10) are fully disjoint,
+    // union = 20 distinct items, each page is ordered DESC by PriceValidFrom.
+    [Fact]
+    public async Task GetByProductIdAsync_ThirtyPrices_TwoPages_AreDisjointAndOrderedDesc()
+    {
+        await using var seedConn = new SqlConnection(TestConnectionStrings.AppTestDb);
+        await seedConn.OpenAsync();
+
+        // Insert 30 prices directly (bypass SP to avoid forward-only complexity).
+        // All rows get an explicit PriceValidTo so no unique-index violation.
+        // PVF: 2026-01-01 to 2026-01-30 (ascending), all closed (PVT = PVF + 1 day).
+        // Except row 30 which has PVT = NULL (the single active row).
+        for (var i = 1; i <= 30; i++)
+        {
+            DateTime? pvt = i < 30
+                ? (DateTime?)new DateTime(2026, 1, i + 1)
+                : null;
+
+            await seedConn.ExecuteAsync("""
+                INSERT INTO dbo.ProductPrices (ProductId, Price, PriceValidFrom, PriceValidTo, FechaCreacion)
+                VALUES (@ProductId, @Price, @PriceValidFrom, @PriceValidTo, SYSUTCDATETIME())
+                """,
+                new
+                {
+                    ProductId   = _defaultProductId,
+                    Price       = (decimal)(i * 10),
+                    PriceValidFrom = new DateTime(2026, 1, i),
+                    PriceValidTo   = pvt
+                });
+        }
+
+        var repo = BuildRepository();
+
+        var page1 = await repo.GetByProductIdAsync(_defaultProductId, page: 1, pageSize: 10);
+        var page2 = await repo.GetByProductIdAsync(_defaultProductId, page: 2, pageSize: 10);
+
+        // Both pages must reflect the full dataset
+        page1.Total.Should().Be(30);
+        page2.Total.Should().Be(30);
+
+        // Each page must have exactly 10 items
+        page1.Items.Should().HaveCount(10);
+        page2.Items.Should().HaveCount(10);
+
+        // Page meta
+        page1.Page.Should().Be(1);
+        page1.PageSize.Should().Be(10);
+        page2.Page.Should().Be(2);
+        page2.PageSize.Should().Be(10);
+
+        // The two ID sets must be fully disjoint
+        var ids1 = page1.Items.Select(p => p.PriceValidFrom).ToHashSet();
+        var ids2 = page2.Items.Select(p => p.PriceValidFrom).ToHashSet();
+        ids1.Intersect(ids2).Should().BeEmpty("pages must not share any items");
+
+        // Union covers exactly 20 distinct items
+        ids1.Union(ids2).Should().HaveCount(20, "union of two pages of 10 must yield 20 distinct items");
+
+        // Page 1 must be ordered DESC — first item is PVF Jan 30 (most recent)
+        page1.Items[0].PriceValidFrom.Should().Be(new DateOnly(2026, 1, 30),
+            "page 1 rank-1 must be the most recent price (DESC)");
+        page1.Items[9].PriceValidFrom.Should().Be(new DateOnly(2026, 1, 21),
+            "page 1 rank-10 must be Jan 21");
+
+        // Page 2 must continue DESC — first item is PVF Jan 20
+        page2.Items[0].PriceValidFrom.Should().Be(new DateOnly(2026, 1, 20),
+            "page 2 rank-1 must be Jan 20 (rank 11 globally in DESC order)");
+        page2.Items[9].PriceValidFrom.Should().Be(new DateOnly(2026, 1, 11),
+            "page 2 rank-10 must be Jan 11");
+    }
+
     // §REQ-4.4 — GetActiveAsync: exact boundary PriceValidFrom = query date → returns row
     [Fact]
     public async Task GetActiveAsync_ExactBoundaryPvf_ReturnsRow()