diff --git a/common/util/billing.go b/common/util/billing.go
index 1e8eb71..c3a09ca 100644
--- a/common/util/billing.go
+++ b/common/util/billing.go
@@ -22,6 +22,8 @@ func CalculateBilling(config map[string]any, billingData map[string]any) map[str
 		return calculateInferenceTierBilling(config, billingData)
 	case "video_resolution": //视频模型计费
 		return calculateVideoResolutionBilling(config, billingData)
+	case "tts":
+		return calculateTTSBilling(config, billingData)
 	}
 	return nil
 }
@@ -116,6 +118,40 @@ func calculateVideoResolutionBilling(config map[string]any, data map[string]any)
 	}
 }
 
+func calculateTTSBilling(config map[string]any, data map[string]any) map[string]any {
+	unit, _ := config["unit"].(string)
+	usage := gconv.Float64(data["usage"])
+
+	tiers := config["pricing"].(map[string]any)["tiers"].([]any)
+	var matched map[string]any
+	for _, t := range tiers {
+		tier := t.(map[string]any)
+		if usage >= gconv.Float64(tier["min"]) && usage <= gconv.Float64(tier["max"]) {
+			matched = tier
+			break
+		}
+	}
+	if matched == nil {
+		return nil
+	}
+
+	unitPrice := gconv.Float64(matched["unit_price"])
+	totalFee := usage * unitPrice
+
+	return map[string]any{
+		"model_name":   data["model_name"],
+		"total_tokens": int64(usage),
+		"total_fee":    totalFee,
+		// 明细
+		"prompt_tokens":     0,
+		"completion_tokens": int64(usage),
+		"usage":             usage,
+		"unit":              unit,
+		"unit_price":        unitPrice,
+		"tier":              fmt.Sprintf("[%v, %v]", matched["min"], matched["max"]),
+	}
+}
+
 // ======================== 数据提取 ========================
 
 func ExtractRequestBilling(ctx context.Context, config map[string]any, requestPayload map[string]any) map[string]any {