Sandwich Detector

Introduction

Sandwich Detector provides projects(e.g. wallet, DEX, and trading bot) with a sandwich attack monitoring service for BSC transactions. Projects can subscribe to the sandwich attack transaction information on BSC in real time based on gRPC. The subscription endpoint is: bsc.sandwich-detector.blockrazor.xyz:80

Plan

	Tier 4	Tier 3	Tier 2	Tier 1	Tier 0
Sandwich Detector	-	-	-	-	✅

The Sandwich Detector service will open a whitelist to projects(e.g. wallet, DEX, and trading bot) subscribing to Tier 0 plan, who can monitor the sandwich attack information on BSC in real time. Please contact us after subscribing to the Tier 0 plan.

Request Parameter

Parameters	Mandatory	Format	Example	Remarks
from	optional	String	""0x3879……42d82a"	Filtering sandwich transactions by the "from" of the attacked transaction
to	optional	String	"0xda77……7098a2"	Filter sandwich transactions by the contract address that the attacked transaction has interacted with
method	optional	String	"0xac9650d8"	Filter sandwich transaction by the method called by the attacked transaction

Request Example

grpcurl

# without filter
grpcurl -plaintext=false -import-path /path/to/proto -proto bscstream.proto -d ''  bsc.sandwich-detector.blockrazor.xyz:443 bscstream.TxStreamService/SubscribeTxStream
# with filter
grpcurl -plaintext=false -import-path /path/to/proto -proto bscstream.proto -d '{"to":"0xaa..bb"}'  bsc.sandwich-detector.blockrazor.xyz:443 bscstream.TxStreamService/SubscribeTxStream

Go

package main

import (
	"context"
	"crypto/tls"
	"log"

	pb "bscstream/proto/bscstream"

	"google.golang.org/grpc"
	"google.golang.org/grpc/credentials"
)

func main() {
	for {
		conn, err := grpc.Dial("bsc.sandwich-detector.blockrazor.xyz:443", grpc.WithTransportCredentials(credentials.NewTLS(&tls.Config{})))
		if err != nil {
			log.Printf("Failed to connect: %v.\n", err)
			continue
		}

		client := pb.NewTxStreamServiceClient(conn)
		stream, err := client.SubscribeTxStream(context.Background(), &pb.TxFilter{
			// Empty for no filter
			From:   "",
			To:     "",
			Method: "",
		})
		if err != nil {
			conn.Close()
			continue
		}

		log.Println("Successfully subscribed to the stream.")

		for {
			resp, err := stream.Recv()
			if err != nil {
				log.Printf("Error receiving stream data: %v. Reconnecting...\n", err)
				conn.Close()
				break
			}

			log.Printf("+%v\n", resp)
		}
	}
}

Proto

// bscstream.proto
syntax = "proto3";

package bscstream;

option go_package = "proto/bscstream";

service TxStreamService {
  rpc SubscribeTxStream(TxFilter) returns (stream TxStreamResponse);
}

message TxFilter {
  string from = 1;   // (optional) from of victim tx to filter
  string to = 2;     // (optional) to of victim tx to filter
  string method = 3; // (optional) method of victim tx fo filter
}

message TxStreamResponse {
  repeated string txs = 1;         // all sandwich tx hash
  string victimtx = 2;             // victim tx hash
  repeated string attackertxs = 3; // frontrun and backrun tx hash
  string from = 4;                 // from of victim hash
  string to = 5;                   // to of victim hash
  string method = 6;               // method of victim hash
  repeated string tokens = 7;      // sandwiched token
  uint64 block = 8;                // block number of txs

  bool heartbeat = 9;              // if this resp is heartbeat, to keep stream alive if no sandwich data available
}

Response Example

{
  "txs": [
    "0xee5b2cfb7a5120206450b7edf2ac824ea810442d982b71923240115ef906acfa",
    "0xb2c9048de1af5be6733b3ed3d1ea4ac74c3d7a9e6c58a9e07ebdac7b8708399b",
    "0x046455f9207b5209489cfada58bfe593acdca58d4a730210e552e56199bfcfe8"
  ],
  "victimtx": "0xb2c9048de1af5be6733b3ed3d1ea4ac74c3d7a9e6c58a9e07ebdac7b8708399b",
  "attackertxs": [
    "0xee5b2cfb7a5120206450b7edf2ac824ea810442d982b71923240115ef906acfa",
    "0x046455f9207b5209489cfada58bfe593acdca58d4a730210e552e56199bfcfe8"
  ],
  "from": "0x387965d0b2dfbebb24aa02e0a068d79a0b42d82a",
  "to": "0xda77c035e4d5a748b4ab6674327fa446f17098a2",
  "method": "0xac9650d8",
  "tokens": [
    "0xdd1b2aaf66a030315a821e7588cf691d73b64444",
    "0xbb4cdb9cbd36b01bd1cbaebf2de08d9173bc095c"
  ],
  "block": "47993864"
}