diff --git a/server/internal/pay/catalog.go b/server/internal/pay/catalog.go
index 73d9b69..872c25f 100644
--- a/server/internal/pay/catalog.go
+++ b/server/internal/pay/catalog.go
@@ -14,11 +14,15 @@ type CatalogItem struct {
 	PriceMinor     int64  `json:"price_minor"`      // CNY 分(展示)
 	Currency       string `json:"currency"`         // CNY
 	PriceUsdtMicro int64  `json:"price_usdt_micro"` // USDT 微元(展示;各币种一口价、非汇率换算)
+	Promo          bool   `json:"promo,omitempty"`  // true=优惠档,客户端用特殊卡片展示(全员可见)
 }
 
-// Catalog 三档单源。时长取宽松口径(31/92/366 覆盖大月与最长季)。
-// USDT 展示价与 pay 侧 products 一口价对齐($4.99/$12.99/$34.99),不做实时汇率换算。
+// Catalog 单源。时长取宽松口径(31/92/366 覆盖大月与最长季)。
+// USDT 展示价与 pay 侧 products 一口价对齐,不做实时汇率换算。
+// pro_month_promo 是全员优惠月付(¥6/$1);**pay 侧需种同 biz_code 商品后方可真下单**,
+// 未种前下单 pay 回 product_not_found → 404(UI 先就绪)。
 var Catalog = []CatalogItem{
+	{SKU: "pro_month_promo", Plan: string(codes.PlanPro), Days: 31, PriceMinor: 600, Currency: "CNY", PriceUsdtMicro: 1000000, Promo: true},
 	{SKU: "pro_month", Plan: string(codes.PlanPro), Days: 31, PriceMinor: 2999, Currency: "CNY", PriceUsdtMicro: 4990000},
 	{SKU: "pro_quarter", Plan: string(codes.PlanPro), Days: 92, PriceMinor: 6888, Currency: "CNY", PriceUsdtMicro: 12990000},
 	{SKU: "pro_year", Plan: string(codes.PlanPro), Days: 366, PriceMinor: 19999, Currency: "CNY", PriceUsdtMicro: 34990000},
diff --git a/server/internal/pay/handler_test.go b/server/internal/pay/handler_test.go
index cc65913..99f1ff6 100644
--- a/server/internal/pay/handler_test.go
+++ b/server/internal/pay/handler_test.go
@@ -286,9 +286,14 @@ func TestCatalog(t *testing.T) {
 		Items []CatalogItem `json:"items"`
 	}
 	_ = json.Unmarshal(w.Body.Bytes(), &resp)
-	if len(resp.Items) != 3 || resp.Items[0].SKU != "pro_month" {
+	if len(resp.Items) != 4 || resp.Items[0].SKU != "pro_month_promo" {
 		t.Fatalf("catalog = %+v", resp.Items)
 	}
+	// 优惠档:全员可见,promo 标记 + ¥6/$1 展示价。
+	promo := resp.Items[0]
+	if !promo.Promo || promo.PriceMinor != 600 || promo.PriceUsdtMicro != 1000000 {
+		t.Fatalf("promo item 不符: %+v", promo)
+	}
 }
 
 // 老 created 单超 TTL → 列表视图显 expired；近期 created → 仍 created。