diff --git a/sundynix-gateway/internal/handler/admin.go b/sundynix-gateway/internal/handler/admin.go
index b91d5e2..989ae94 100644
--- a/sundynix-gateway/internal/handler/admin.go
+++ b/sundynix-gateway/internal/handler/admin.go
@@ -217,32 +217,56 @@ func (h *Handler) ListPricing(c *gin.Context) {
 	out := make([]gin.H, 0, len(rows))
 	for _, p := range rows {
 		out = append(out, gin.H{
-			"model_id": p.ModelID, "input_per_1k": p.InputPer1K, "output_per_1k": p.OutputPer1K, "currency": p.Currency,
+			"model_id": p.ModelID, "input_per_1k": p.InputPer1K, "output_per_1k": p.OutputPer1K,
+			"credit_weight": p.CreditWeight, "currency": p.Currency,
 		})
 	}
 	c.JSON(http.StatusOK, gin.H{"pricing": out})
 }
 
-// SavePricing: PUT /api/v1/admin/pricing —— 设置某模型的输入/输出单价（每 1K token）。
+// SavePricing: PUT /api/v1/admin/pricing —— 设置某模型的输入/输出单价（每 1K token）+ 积分权重。
 func (h *Handler) SavePricing(c *gin.Context) {
 	var b struct {
-		ModelID     string  `json:"model_id"`
-		InputPer1K  float64 `json:"input_per_1k"`
-		OutputPer1K float64 `json:"output_per_1k"`
-		Currency    string  `json:"currency"`
+		ModelID      string  `json:"model_id"`
+		InputPer1K   float64 `json:"input_per_1k"`
+		OutputPer1K  float64 `json:"output_per_1k"`
+		CreditWeight float64 `json:"credit_weight"`
+		Currency     string  `json:"currency"`
 	}
 	if err := c.ShouldBindJSON(&b); err != nil || b.ModelID == "" {
 		c.JSON(http.StatusBadRequest, gin.H{"error": "model_id required"})
 		return
 	}
-	if b.InputPer1K < 0 || b.OutputPer1K < 0 {
-		c.JSON(http.StatusBadRequest, gin.H{"error": "单价不能为负"})
+	if b.InputPer1K < 0 || b.OutputPer1K < 0 || b.CreditWeight < 0 {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "单价/权重不能为负"})
 		return
 	}
 	if b.Currency == "" {
 		b.Currency = "CNY"
 	}
-	if err := h.db.UpsertPricing(c.Request.Context(), b.ModelID, b.InputPer1K, b.OutputPer1K, b.Currency); err != nil {
+	if err := h.db.UpsertPricing(c.Request.Context(), b.ModelID, b.InputPer1K, b.OutputPer1K, b.CreditWeight, b.Currency); err != nil {
+		c.JSON(http.StatusBadGateway, gin.H{"error": err.Error()})
+		return
+	}
+	c.JSON(http.StatusOK, gin.H{"status": "ok"})
+}
+
+// BillingConfig: GET /api/v1/admin/billing-config —— 全局计费规则（当前仅 token→积分汇率）。
+func (h *Handler) BillingConfig(c *gin.Context) {
+	tpc := h.db.GetSetting(c.Request.Context(), store.SettingTokensPerCredit)
+	c.JSON(http.StatusOK, gin.H{"tokens_per_credit": tpc}) // 空串=未设，前端回退默认
+}
+
+// SaveBillingConfig: PUT /api/v1/admin/billing-config —— 设 token→积分汇率（>0）。
+func (h *Handler) SaveBillingConfig(c *gin.Context) {
+	var b struct {
+		TokensPerCredit float64 `json:"tokens_per_credit"`
+	}
+	if err := c.ShouldBindJSON(&b); err != nil || b.TokensPerCredit <= 0 {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "tokens_per_credit 必须 > 0"})
+		return
+	}
+	if err := h.db.SetSetting(c.Request.Context(), store.SettingTokensPerCredit, strconv.FormatFloat(b.TokensPerCredit, 'f', -1, 64)); err != nil {
 		c.JSON(http.StatusBadGateway, gin.H{"error": err.Error()})
 		return
 	}
diff --git a/sundynix-gateway/internal/router/router.go b/sundynix-gateway/internal/router/router.go
index 4b16458..7b377e7 100644
--- a/sundynix-gateway/internal/router/router.go
+++ b/sundynix-gateway/internal/router/router.go
@@ -96,8 +96,10 @@ func New(db *store.Postgres, cache *store.Redis, bus *nats.Bus, blobStore *blob.
 			admin.POST("/models/:id/active", h.SetActiveModel)
 			admin.DELETE("/models/:id", h.DeleteModel)
 			admin.POST("/models/test", h.TestModel)
-			admin.GET("/pricing", h.ListPricing) // 各模型计价（token↔真钱）
-			admin.PUT("/pricing", h.SavePricing) // 设置某模型输入/输出单价
+			admin.GET("/pricing", h.ListPricing) // 各模型计价（token↔真钱 + 积分权重）
+			admin.PUT("/pricing", h.SavePricing) // 设置某模型输入/输出单价 + 积分权重
+			admin.GET("/billing-config", h.BillingConfig)  // 全局计费规则（token→积分汇率）
+			admin.PUT("/billing-config", h.SaveBillingConfig)
 			admin.GET("/status", h.AdminStatus)      // 服务状态：基建/服务探活 + MCP 工具注册
 			admin.GET("/overview", h.AdminOverview)  // 系统级聚合：全平台用户/任务/评测/模型态/提示词态/健康
 			admin.GET("/usage", h.AdminUsage)        // 用量/积分/成本：全平台按天趋势 + 租户排行 / 单租户余额
diff --git a/sundynix-gateway/internal/store/model.go b/sundynix-gateway/internal/store/model.go
index 5698d42..806dd28 100644
--- a/sundynix-gateway/internal/store/model.go
+++ b/sundynix-gateway/internal/store/model.go
@@ -268,15 +268,16 @@ func (p *Postgres) ListPricing(ctx context.Context) ([]Pricing, error) {
 	return rows, err
 }
 
-// UpsertPricing 写入/更新某模型的计价（model_id 唯一，重复即覆盖单价/币种）。
-func (p *Postgres) UpsertPricing(ctx context.Context, modelID string, inPer1K, outPer1K float64, currency string) error {
+// UpsertPricing 写入/更新某模型的计价（model_id 唯一，重复即覆盖单价/币种/积分权重）。
+// creditWeight 为每模型积分权重（0=按 1.0 计，即不加权）。
+func (p *Postgres) UpsertPricing(ctx context.Context, modelID string, inPer1K, outPer1K, creditWeight float64, currency string) error {
 	if p.db == nil {
 		return errStoreDisabled
 	}
 	return p.db.WithContext(ctx).Clauses(clause.OnConflict{
 		Columns:   []clause.Column{{Name: "model_id"}},
-		DoUpdates: clause.Assignments(map[string]any{"input_per_1k": inPer1K, "output_per_1k": outPer1K, "currency": currency, "updated_at": time.Now()}),
-	}).Create(&Pricing{ModelID: modelID, InputPer1K: inPer1K, OutputPer1K: outPer1K, Currency: currency}).Error
+		DoUpdates: clause.Assignments(map[string]any{"input_per_1k": inPer1K, "output_per_1k": outPer1K, "credit_weight": creditWeight, "currency": currency, "updated_at": time.Now()}),
+	}).Create(&Pricing{ModelID: modelID, InputPer1K: inPer1K, OutputPer1K: outPer1K, CreditWeight: creditWeight, Currency: currency}).Error
 }
 
 // LLMModel 是一个模型后端配置（控制面：管理员在此登记可用模型）。
diff --git a/sundynix-gateway/internal/store/pgsql.go b/sundynix-gateway/internal/store/pgsql.go
index 025ca14..36802f8 100644
--- a/sundynix-gateway/internal/store/pgsql.go
+++ b/sundynix-gateway/internal/store/pgsql.go
@@ -66,7 +66,7 @@ func OpenPostgres(dsn string) *Postgres {
 	migrateLegacyIntIDs(db)
 	migrateDocLinkToID(db)
 
-	if err := db.AutoMigrate(&User{}, &Task{}, &Eval{}, &LLMModel{}, &KB{}, &Doc{}, &Agent{}, &DocLink{}, &Pricing{}, &Prompt{}, &AuditLog{}, &GuardrailEvent{}, &Tenant{}, &TenantMember{}, &UsageEvent{}, &CreditLedger{}, &UsageRollup{}); err != nil {
+	if err := db.AutoMigrate(&User{}, &Task{}, &Eval{}, &LLMModel{}, &KB{}, &Doc{}, &Agent{}, &DocLink{}, &Pricing{}, &Prompt{}, &AuditLog{}, &GuardrailEvent{}, &Tenant{}, &TenantMember{}, &UsageEvent{}, &CreditLedger{}, &UsageRollup{}, &Setting{}); err != nil {
 		log.Printf("[store] postgres AutoMigrate 失败，降级运行: %v", err)
 		return &Postgres{}
 	}
diff --git a/sundynix-gateway/internal/store/setting.go b/sundynix-gateway/internal/store/setting.go
new file mode 100644
index 0000000..566947c
--- /dev/null
+++ b/sundynix-gateway/internal/store/setting.go
@@ -0,0 +1,43 @@
+package store
+
+import (
+	"context"
+
+	"gorm.io/gorm/clause"
+)
+
+// Setting 是平台级键值配置（全局，非租户作用域）——如 token→积分汇率 等可后台热调的计费规则。
+// 表名 sundynix_setting。Key 唯一。
+type Setting struct {
+	BaseModel
+	Key   string `gorm:"size:64;uniqueIndex"`
+	Value string `gorm:"size:255"`
+}
+
+func (Setting) TableName() string { return "sundynix_setting" }
+
+// 平台设置键。
+const SettingTokensPerCredit = "tokens_per_credit"
+
+// GetSetting 读一个平台设置；不存在返回空串（调用方回退默认）。
+func (p *Postgres) GetSetting(ctx context.Context, key string) string {
+	if p.db == nil {
+		return ""
+	}
+	var s Setting
+	if err := p.db.WithContext(ctx).Select("value").Where("key = ?", key).First(&s).Error; err != nil {
+		return ""
+	}
+	return s.Value
+}
+
+// SetSetting 幂等写一个平台设置（key 唯一，重复即覆盖 value）。
+func (p *Postgres) SetSetting(ctx context.Context, key, value string) error {
+	if p.db == nil {
+		return errStoreDisabled
+	}
+	return p.db.WithContext(ctx).Clauses(clause.OnConflict{
+		Columns:   []clause.Column{{Name: "key"}},
+		DoUpdates: clause.AssignmentColumns([]string{"value", "updated_at"}),
+	}).Create(&Setting{Key: key, Value: value}).Error
+}
diff --git a/sundynix-gateway/internal/store/usage.go b/sundynix-gateway/internal/store/usage.go
index 7e04e73..eadf7ff 100644
--- a/sundynix-gateway/internal/store/usage.go
+++ b/sundynix-gateway/internal/store/usage.go
@@ -34,8 +34,21 @@ type UsageEvent struct {
 func (UsageEvent) TableName() string { return "sundynix_usage_event" }
 func (UsageEvent) isTenantScoped()   {}
 
-// TokensPerCredit 读 token→积分 汇率（env TOKENS_PER_CREDIT，缺省/非法=1000）。设 1 即 token 直计。
-func TokensPerCredit() float64 {
+// tokensPerCredit 读 token→积分 汇率：优先 DB 平台设置（后台可热调），回退 env，再回退 1000。
+// 设 1 即 token 直计。
+func (p *Postgres) tokensPerCredit(ctx context.Context) float64 {
+	if p.db != nil {
+		if v := p.GetSetting(ctx, SettingTokensPerCredit); v != "" {
+			if n, err := strconv.ParseFloat(v, 64); err == nil && n > 0 {
+				return n
+			}
+		}
+	}
+	return tokensPerCreditEnv()
+}
+
+// tokensPerCreditEnv 是 DB 未设时的缺省来源（env TOKENS_PER_CREDIT，非法=1000）。
+func tokensPerCreditEnv() float64 {
 	if v := os.Getenv("TOKENS_PER_CREDIT"); v != "" {
 		if n, err := strconv.ParseFloat(v, 64); err == nil && n > 0 {
 			return n
@@ -71,7 +84,7 @@ func (p *Postgres) SaveUsageEvent(ctx context.Context, ev *contract.UsageEvent)
 		costMicros = int64(cost * 1e6)
 	}
 	// credits_micro = total_tok / tokensPerCredit * weight，×10⁶ 存微积分。
-	creditsMicro := int64(float64(ev.TotalTok) / TokensPerCredit() * weight * 1e6)
+	creditsMicro := int64(float64(ev.TotalTok) / p.tokensPerCredit(ctx) * weight * 1e6)
 
 	row := &UsageEvent{
 		TenantID: ev.TenantID, Owner: ev.UserID, TaskID: ev.TaskID, Model: model,