diff --git a/examples/webhooks/main.go b/examples/webhooks/main.go
index a466301..5d5986b 100644
--- a/examples/webhooks/main.go
+++ b/examples/webhooks/main.go
@@ -1,9 +1,12 @@
 package main
 
 import (
+	"crypto/sha256"
+	"encoding/hex"
 	"encoding/json"
 	"fmt"
 	"net/http"
+	"sync"
 )
 
 type AccountTxPayload struct {
@@ -12,20 +15,53 @@ type AccountTxPayload struct {
 	TxHash    string `json:"tx_hash"`
 }
 
+type MempoolEvent struct {
+	EventType string `json:"event_type"`
+	Boc       string `json:"boc"`
+}
+
+var (
+	mu     sync.Mutex
+	hashes = make(map[string]int)
+)
+
 func webhook(w http.ResponseWriter, req *http.Request) {
 	defer req.Body.Close()
 
-	var payload AccountTxPayload
+	fmt.Printf("req: %v\n", req.Method)
+	for name, header := range req.Header {
+		fmt.Printf("header: %v -> %#v\n", name, header)
+
+	}
+	var payload MempoolEvent
 	if err := json.NewDecoder(req.Body).Decode(&payload); err != nil {
 		w.WriteHeader(http.StatusBadRequest)
 		return
 	}
 
-	fmt.Printf("%v\n", payload)
+	hash := sha256.New()
+	hash.Write([]byte(payload.Boc))
+	payloadHash := hash.Sum(nil)
+	payloadHex := hex.EncodeToString(payloadHash)
+
 	w.WriteHeader(http.StatusOK)
+
+	mu.Lock()
+	defer mu.Unlock()
+
+	hashes[payloadHex] += 1
+
+	value := hashes[payloadHex]
+	if value > 2 {
+		fmt.Printf("payload hex %v -> %v\n", payloadHex, value)
+	}
+
+	if len(hashes) > 100_000 {
+		hashes = make(map[string]int)
+	}
 }
 
 func main() {
-	http.HandleFunc("/", webhook)
-	http.ListenAndServe(":8092", nil)
+	http.HandleFunc("/webhook", webhook)
+	http.ListenAndServe(":8030", nil)
 }