diff --git a/api_v1.go b/api_v1.go
index b683725..f1be4ed 100644
--- a/api_v1.go
+++ b/api_v1.go
@@ -2,6 +2,8 @@ package main
 
 import (
 	"context"
+	"encoding/json"
+	"errors"
 	"fmt"
 	"strconv"
 	"time"
@@ -194,6 +196,127 @@ func v1_update_task(c *gin.Context) {
 	})
 }
 
+type Item struct {
+	Item_id          string `json:"item_id"`
+	Item_id_type     string `json:"item_id_type"`
+	Item_status      string `json:"item_status"`
+	Item_status_type string `json:"item_status_type"`
+	Payload          string `json:"payload"`
+}
+
+func v1_insert_many(c *gin.Context) {
+	identifier := c.Param("identifier")
+	client_version := c.Param("client_version")
+	archivist := c.Param("archivist")
+	top_items_rawString := c.PostForm("items")
+
+	if is_safe_sting(identifier) && is_safe_sting(archivist) {
+		// OK
+	} else {
+		c.JSON(400, gin.H{"error": "Invalid parameter or query string"})
+		return
+	}
+
+	project := GetProject(identifier)
+	if project == nil {
+		c.JSON(404, gin.H{
+			"error": fmt.Sprintf("Project %s not found", identifier),
+		})
+		return
+	}
+	if client_version != project.Client.Version {
+		c.JSON(400, gin.H{
+			"error": "Client version not supported",
+			"msg":   fmt.Sprintf("Please update to version %s", project.Client.Version),
+		})
+		return
+	}
+
+	db := mongoClient.Database(project.Mongodb.DbName)
+	item_collection := db.Collection(project.Mongodb.ItemCollection)
+
+	topItems := []Item{}
+	err := json.Unmarshal([]byte(top_items_rawString), &topItems)
+	if err != nil {
+		c.JSON(400, gin.H{"error": "Invalid JSON items"})
+		panic(err)
+	}
+
+	var doc_id_name string
+	if project.Mongodb.CustomDocIDName != "" {
+		doc_id_name = project.Mongodb.CustomDocIDName
+	} else {
+		doc_id_name = DEFAULT_DOC_ID_NAME
+	}
+
+	documents := []interface{}{}
+
+	for _, item := range topItems {
+		document := bson.M{}
+		// id
+		if item.Item_id_type == "str" {
+			document[doc_id_name] = item.Item_id
+		} else if item.Item_id_type == "int" {
+			item_id_int, err := strconv.ParseInt(item.Item_id, 10, 64)
+			if err != nil {
+				c.JSON(400, gin.H{"error": "Invalid item_id"})
+				return
+			}
+			document[doc_id_name] = item_id_int
+		} else {
+			c.JSON(400, gin.H{"error": "Invalid task_id_type"})
+			return
+		}
+		// status
+		if item.Item_status_type == "str" {
+			document["status"] = item.Item_status
+		} else if item.Item_status_type == "int" {
+			status, err := strconv.ParseInt(item.Item_status, 10, 64)
+			if err != nil {
+				c.JSON(400, gin.H{"error": "Invalid item_status"})
+				return
+			}
+			document["status"] = status
+		} else if item.Item_status_type == "None" {
+			document["status"] = nil
+		} else {
+			c.JSON(400, gin.H{"error": "Invalid status_type"})
+			return
+		}
+		// payload
+		var payload_BSON primitive.M
+		err := bson.UnmarshalExtJSON([]byte(item.Payload), true, &payload_BSON)
+		if err != nil {
+			c.JSON(400, gin.H{"error": "Invalid JSON payload"})
+			panic(err)
+		}
+		document["payload"] = payload_BSON
+
+		documents = append(documents, document)
+	}
+
+	// do insert, sorted=false
+	opt := options.InsertMany().SetOrdered(false)
+	result, err := item_collection.InsertMany(context.TODO(), documents, opt)
+	// if err is BulkWriteException
+	if err != nil {
+		if !errors.As(err, &mongo.BulkWriteException{}) {
+			c.JSON(500, gin.H{"error": "Failed to insert items"})
+			panic(err)
+		}
+		// BulkWriteException is expected
+	}
+
+	bulkWriteException, _ := err.(mongo.BulkWriteException)
+	c.JSON(200, gin.H{
+		"InsertedIDs":       result.InsertedIDs,
+		"msg":               "Items bulk insert actions done successfully",
+		"WriteErrors":       len(bulkWriteException.WriteErrors),
+		"Labels":            len(bulkWriteException.Labels),
+		"WriteConcernError": bulkWriteException.WriteConcernError,
+	})
+}
+
 func v1_insert_item(c *gin.Context) {
 	identifier := c.Param("identifier")
 	client_version := c.Param("client_version")
diff --git a/main.go b/main.go
index e11d5d6..6455924 100644
--- a/main.go
+++ b/main.go
@@ -56,6 +56,7 @@ func main() {
 		v1_tracker.POST("/project/:identifier/:client_version/:archivist/claim_task", v1_claim_task)
 		v1_tracker.POST("/project/:identifier/:client_version/:archivist/update_task/:task_id", v1_update_task)
 		v1_tracker.POST("/project/:identifier/:client_version/:archivist/insert_item/:item_id", v1_insert_item)
+		v1_tracker.POST("/project/:identifier/:client_version/:archivist/insert_many/:size", v1_insert_many) // :size unused
 	}
 	r.Run()
 }