Front-Running Protection & Transaction Bundle

Trader API provides two advanced features: Front-Running Protection and Transaction Bundling.

Features

1. Front-Running Protection

   • Protects your transactions from MEV attacks when calling the Submit endpoint.

   • Two modes:

     • Fast Best Effort: Sends transactions to Jito and low-risk validators for a balance of protection and speed.

     • Jito Only: Uses Jito exclusively for maximum protection.

2. Transaction Bundling

   • Executes multiple transactions together as a single, atomic bundle when calling the Batch Submit endpoint:

     • Sequential: Transactions execute in the provided order.

     • Atomic: All transactions succeed or none are included.

     • All-or-Nothing: If one transaction fails, the entire bundle is rejected.

Fees

• A service fee will be charged for Front-Running Protection. It will be 2–5% of the tip (based on your account tier).

• Transaction Bundles: 5% of the total tip per transaction in the bundle.

  • Example: A bundle with 2 transactions incurs a 10% tip fee (Introductory tier).

  • Maximum of 4 transactions in a bundle.

• Minimum Tip: 0.001 SOL (1,000,000 lamports).

Account Tier	Tip Service Fee
Ultra	2%
Enterprise-Elite	2%
Enterprise	4%
Professional	5%
Introductory	5%

Custom Transaction Construction

If you’re not using Trader API endpoints, include a tip instruction manually in your transactions to enable these features.

Go

import (
	"github.com/gagliardetto/solana-go"
	"github.com/gagliardetto/solana-go/programs/system"
)

const (
	// BloxrouteTipAddress is from here and may fall out of date from time to time. Check our docs:
	// https://docs.bloxroute.com/solana/trader-api-v2/front-running-protection-and-transaction-bundle
	BloxrouteTipAddress = "HWEoBxYs7ssKuudEjzjmpfJVX7Dvi7wescFsVx2L5yoY"
)

// CreateBloxrouteTipTransactionToUseBundles creates a transaction you can use to when using PostSubmitBundle endpoints.
// This transaction should be the LAST transaction in your submission bundle
func CreateBloxrouteTipTransactionToUseBundles(privateKey solana.PrivateKey, tipAmount uint64, recentBlockHash solana.Hash) (*solana.Transaction, error) {
	recipient := solana.MustPublicKeyFromBase58(BloxrouteTipAddress)

	tx, err := solana.NewTransaction([]solana.Instruction{
		system.NewTransferInstruction(tipAmount, privateKey.PublicKey(), recipient).Build()}, recentBlockHash)
	if err != nil {
		return nil, err
	}

	signatures, err := tx.Sign(func(key solana.PublicKey) *solana.PrivateKey {
		if key.Equals(privateKey.PublicKey()) {
			return &privateKey
		}
		return nil
	})
	if err != nil {
		return nil, err
	}

	tx.Signatures = signatures

	return tx, nil
}

TypeScript

import {
    Keypair,
    PublicKey,
    Transaction,
    TransactionInstruction,
    MessageCompiledInstruction,
    VersionedTransaction,
    SystemProgram,
} from "@solana/web3.js"
// check documentation for latest tip wallet, and how to send tip transactions
// https://docs.bloxroute.com/solana/trader-api-v2/front-running-protection-and-transaction-bundle
const TRADER_API_TIP_WALLET = "HWEoBxYs7ssKuudEjzjmpfJVX7Dvi7wescFsVx2L5yoY"

// createTraderAPIMemoInstruction generates a transaction instruction that places a memo in the transaction log
// Having a memo instruction with signals Trader-API usage is required
export function CreateTraderAPITipInstruction(
    senderAddress: PublicKey,
    tipAmount: number
): TransactionInstruction {
    const tipAddress = new PublicKey(TRADER_API_TIP_WALLET)

    return SystemProgram.transfer({
        fromPubkey: senderAddress,
        toPubkey: tipAddress,
        lamports: tipAmount,
    })
}

Python

from numpy import uint64
from solders import pubkey as pk
from solders import instruction as inst
from solders import transaction as solders_tx
from solders.hash import Hash
from solders.keypair import Keypair
from solders.message import Message
from solders.pubkey import Pubkey
from solders.system_program import transfer, TransferParams
from solders.transaction import Transaction

# as of 2/12/2024, this is the bloxRoute tip wallet... check docs to see latest up to date tip wallet:
# https://docs.bloxroute.com/solana/trader-api-v2/front-running-protection-and-transaction-bundle
BloxrouteTipWallet = pk.Pubkey.from_string(
    "HWEoBxYs7ssKuudEjzjmpfJVX7Dvi7wescFsVx2L5yoY"
)


# create_trader_api_tip_instruction creates a tip instruction to send to bloxRoute. This is used if a user wants to send
# bundles or wants front running protection. If using bloXroute API, this instruction must be included in the last
# transaction sent to the API
def create_trader_api_tip_instruction(
    tip_amount: uint64,
    sender_address: Pubkey,
) -> inst.Instruction:
    instruction = transfer(
        TransferParams(
            from_pubkey=sender_address,
            to_pubkey=BloxrouteTipWallet,
            lamports=int(tip_amount),
        )
    )

    return instruction

If your language of choice is not included above, you can create an instruction referencing our tip-receiving addresses:

➡️ Next Steps: Submit a transaction or submit a bundle of transactions