MEV bot on VPS: gas optimization, RPC nodes, sandwich attacks

For the efficient operation of an MEV bot on a VPS, especially when implementing sandwich attacks and other strategies, a high-performance VPS with minimal latency to RPC nodes and builders is critically important, optimized for minimizing gas costs and fast transaction execution on the Ethereum blockchain.

What is MEV and why is it relevant for Ethereum bots on a VPS?

MEV (Maximal Extractable Value) represents the profit that miners (and now validators in Ethereum after The Merge) or other network participants can obtain by reordering, censoring, or inserting transactions into blocks. This is not necessarily an abuse; some forms of MEV, such as arbitrage, contribute to market efficiency, while others, like front-running, are controversial.

The relevance of MEV for an Ethereum bot VPS is due to several factors:

• Blockchain Predictability: All pending transactions (in the mempool) are publicly visible, allowing bots to analyze them and build strategies.
• High DeFi Liquidity: Decentralized exchanges (DEXs), lending protocols, and other DeFi applications create numerous opportunities for arbitrage, liquidations, and other MEV strategies.
• Competition: Thousands of bots constantly scan the mempool for opportunities, making the competition for MEV extremely intense. This requires maximum speed and minimal latency, which only a powerful VPS for an MEV bot can provide.

MEV Strategies: How do sandwich attacks, front-running, and back-running work?

MEV bots use various strategies to extract value, each requiring high reaction speed and precise calculation. For successful execution of these strategies, mev hosting must provide ultra-low latency.

Front-running

This strategy involves detecting a large pending transaction (e.g., a significant token purchase on a DEX) that is likely to affect the asset's price. The MEV bot sends its own transaction with a higher fee (gas price) before the target transaction, so it gets included in the block earlier. After the target transaction is executed and the price changes, the bot can sell the asset at the new, more favorable price. This requires extremely low latency and direct access to the mempool.

Sandwich Attacks

A sandwich attack is a more complex form of front-running, where the bot "sandwiches" a target transaction between two of its own transactions. First, the bot sends a transaction (e.g., a purchase) with a high gas price so that it gets into the block before the target transaction. Then, the target transaction is executed, which moves the price. Immediately after, the bot sends a second transaction (a sale) with an even higher gas price so that it gets into the same block or immediately after the target transaction, locking in profit from the price change. This is one of the most profitable, but also technically challenging strategies, requiring optimal sandwich bot hosting.

Back-running

Back-running involves detecting a transaction that will create an arbitrage opportunity or a liquidation opportunity, and immediately sending one's own transaction to take advantage of this opportunity right after the target transaction is executed. For example, if a large transaction on one DEX creates a price imbalance with another DEX, a back-run bot will instantly execute an arbitrage trade. This strategy is less aggressive than front-running but also requires speed and precision.

The Criticality of Latency for an MEV Bot on a VPS and the Role of Flashbots

In the world of MEV trading, every millisecond matters. Competition for transaction inclusion in blocks is fierce, and even minimal latency can lead to missed profits or, worse, losses. An Ethereum bot VPS must be located as close as possible to blockchain nodes and block builders.

Key aspects of latency criticality:

• Mempool Access: The faster your bot receives information about a new transaction in the mempool, the more time it has to analyze and formulate a response transaction.
• Transaction Submission: The speed at which your transaction reaches block builders determines its chances of being included in the next block.
• Competition: Thousands of bots worldwide compete for the same opportunities. The one who processes data and sends the transaction faster wins.

Flashbots is an initiative aimed at reducing the negative consequences of MEV and creating a fairer and more efficient market. Flashbots offers a private channel for sending transactions directly to builders (miners/validators), bypassing the public mempool. This allows for:

• Avoiding Front-running: Your transactions are not publicly visible until they are included in a block.
• Coordinating MEV: Builders can accept "bundles" of transactions, which guarantee a specific execution order, critically important for sandwich attacks and arbitrage.

Using a Flashbots VPS is becoming standard for serious MEV operators, as it provides more predictable and secure strategy execution, significantly reducing the risks associated with the public mempool.

Choosing an RPC Node for MEV Hosting: Alchemy, QuickNode, or your own?

Choosing an RPC (Remote Procedure Call) provider or deploying your own node is one of the most important decisions for an MEV bot. This determines the speed of data retrieval from the blockchain and the speed of transaction submission. For mev hosting, this is a fundamental component.

1. Public RPC Providers (Alchemy, QuickNode, Infura)

Pros:

• Simplicity: Easy to set up, requires no maintenance.
• Reliability: High availability and scalability, ready-made infrastructure.
• Speed (relative): Usually offer sufficiently low latency, especially paid plans with dedicated nodes.

Cons:

• Limitations: Free plans have request limits. Paid plans can be expensive.
• Latency: Even on paid plans, latency can be higher than with your own node, especially if your VPS is far from their servers.
• Censorship/Throttling: May apply restrictions or delays for high-frequency requests.

2. Your Own RPC Node on a VPS/Dedicated Server

Deploying your own Ethereum node (e.g., Geth or Erigon) on a powerful VPS or dedicated server provides maximum control and potentially minimal latency.

Pros:

• Minimal Latency: If the node is deployed on the same VPS as the bot, or on an adjacent server in the same data center, latency will be minimal (single-digit milliseconds).
• Full Control: You have complete control over configuration, resources, and access.
• No Limits: No restrictions on the number of requests.
• Privacy: Your requests do not pass through third-party providers.

Cons:

• Complexity: Requires significant technical knowledge for installation, configuration, and maintenance.
• Resources: An Ethereum node requires many resources:
  • CPU: 4+ vCPU (8+ recommended)
  • RAM: 16-32 GB (32+ GB for Erigon)
  • Disk: NVMe SSD, 1-2 TB for Geth (full history), 500 GB+ for Erigon (pruned). Read/write speed is critical.
  • Network: Stable gigabit channel.
• Synchronization Time: Initial node synchronization can take days or even weeks.

Comparison of RPC Providers and Your Own Node

For a serious mev bot vps with high-speed requirements, an own node on a powerful dedicated server or high-performance VPS is the optimal solution, despite the initial complexities.

Optimizing Gas Costs and Typical Software for Ethereum MEV Bots

Minimizing gas costs is a key factor in the profitability of an MEV bot. Even if a transaction is successful, high fees can eat up all the profit or make the operation unprofitable.

Gas Optimization Strategies:

• Precise Gas Price Calculation: Using advanced algorithms to predict the optimal gas price, ensuring the transaction goes through quickly enough without overpaying. Utilizing EIP-1559 with maxFeePerGas and maxPriorityFeePerGas.
• Contract Optimization: If you are using your own smart contract, ensure it is as gas-efficient as possible.
• Batching Transactions: Combining multiple operations into a single transaction, if possible, to save on base transaction costs.
• Using Flashbots: Sending bundles via Flashbots allows you to specify a preferred "tip" (minerTip) to the validator, which is included in the block, bypassing competition for gas price in the public mempool.

Typical Software for MEV Bots:

• Geth/Erigon: Ethereum clients for running your own node. Erigon is often chosen for its disk and RAM efficiency, as well as faster synchronization.
• Web3.js/Ethers.js: Libraries for interacting with the Ethereum blockchain from JavaScript/TypeScript.
• Python Libraries: Web3.py for Python bots.
• Flashbots MEV-Share: A protocol allowing users to share their transactions with builders to receive a portion of MEV. Bots can use it to find opportunities or send private transactions.
• MEV-Boost: A component used by validators to outsource block building to external builders who specialize in MEV search. This is part of the Flashbots infrastructure.
• Custom Scripts and Contracts: Most MEV bots use custom code written in Solidity (for smart contracts) and programming languages like Python, Go, Rust, or TypeScript for the bot's logic.

Example of a simple RPC node request to get the current gas price (pseudocode):

// Using ethers.js in Node.js
const { ethers } = require("ethers");
const provider = new ethers.JsonRpcProvider("YOUR_RPC_URL");

async function getGasPrice() {
    try {
        const feeData = await provider.getFeeData();
        console.log("Max Fee per Gas:", ethers.formatUnits(feeData.maxFeePerGas, "gwei"), "gwei");
        console.log("Max Priority Fee per Gas:", ethers.formatUnits(feeData.maxPriorityFeePerGas, "gwei"), "gwei");
        console.log("Gas Price (legacy):", ethers.formatUnits(feeData.gasPrice, "gwei"), "gwei");
    } catch (error) {
        console.error("Error fetching gas price:", error);
    }
}

getGasPrice();

Which VPS to Choose for an Effective MEV Bot?

Choosing the right VPS or dedicated server is critically important for the success of your MEV bot. Requirements depend on whether you will run your own node or use public RPC providers.

Key VPS Requirements for an MEV Bot:

1. Processor (CPU):
   • Without own node: 2-4 vCPU with a frequency of 3.0 GHz or higher. High core clock speed is important.
   • With own node (Geth/Erigon): 4-8+ vCPU with a high clock speed (3.5+ GHz recommended). Erigon can be more efficient but still requires power.
2. Random Access Memory (RAM):
   • Without own node: 4-8 GB RAM.
   • With own node: 16-32 GB RAM (32 GB or more for Erigon for optimal performance).
3. Disk Subsystem:
   • Type: EXCLUSIVELY NVMe SSD. Read/write speed is critical for node synchronization and fast data access.
   • Volume:
     • Without own node: 50-100 GB.
     • With own node (Geth): From 1.5-2 TB for a full node.
     • With own node (Erigon): From 500 GB for a pruned node.
4. Network Connection:
   • Speed: Gigabit port (1 Gbps) with unlimited or very high traffic volume.
   • Latency: Choose a data center located as close as possible to the main Ethereum traffic exchange points (builders, Flashbots relays, major RPC providers). Locations in Europe (Frankfurt, Amsterdam) or the USA (New York, Chicago) are often good choices.
5. Operating System: Linux (Ubuntu Server, Debian) — this is the standard for deploying bots and nodes.

Valebyte.com offers high-performance VPS and dedicated servers that are ideally suited for an mev bot vps. Our servers are equipped with NVMe drives, high-frequency processors, and stable network channels, ensuring minimal latency and maximum performance.

Practical Steps for Deploying and Configuring an MEV Bot on a VPS

Deploying an ethereum bot vps requires sequential steps. Here are general recommendations:

1. Choosing and Renting a VPS: Select a Valebyte plan that meets your requirements (minimum 4 vCPU, 16 GB RAM, 500 GB NVMe, 1 Gbps channel for your own node).
2. OS Installation: Deploy Ubuntu Server 22.04 LTS or Debian 12.
3. Security Configuration:
   • Update the system: sudo apt update && sudo apt upgrade -y
   • Install and configure a firewall (UFW): sudo ufw enable && sudo ufw allow ssh && sudo ufw allow 8545/tcp (for RPC)
   • Configure SSH keys, disable password login for root.
4. Installing Docker and Docker Compose: This will simplify node and bot deployment.

   
               sudo apt install apt-transport-https ca-certificates curl software-properties-common -y
               curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /usr/share/keyrings/docker-archive-keyring.gpg
               echo "deb [arch=$(dpkg --print-architecture) signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
               sudo apt update && sudo apt install docker-ce docker-ce-cli containerd.io docker-compose-plugin -y
               sudo usermod -aG docker $USER && newgrp docker
           

5. Deploying an Ethereum Node (optional, but recommended):
   • Use Erigon or Geth in Docker. Example docker-compose.yml for Erigon:

     
                         version: "3.8"
                         services:
                           erigon:
                             image: thorax/erigon:latest
                             container_name: erigon
                             restart: always
                             ports:
                               - "8545:8545" # RPC
                               - "8551:8551" # Engine API
                             volumes:
                               - ./erigon_data:/var/lib/erigon
                             command:
                               - --chain=mainnet
                               - --prune=htc
                               - --rpc.api=eth,web3,net,debug,trace,txpool,erigon
                               - --rpc.addr=0.0.0.0
                               - --autotune
                               - --datadir=/var/lib/erigon
                     

   • Run: docker compose up -d. Wait for full synchronization (may take several days).
6. MEV Bot Configuration:
   • Clone your bot's repository.
   • Install dependencies (Node.js, Python, Go, etc.).
   • Configure environment variables: RPC URL (http://localhost:8545 if the node is on the same VPS), private keys, gas limits, strategies.
   • Integrate with Flashbots (if used): configure Flashbots keys and use their API to send bundles.
7. Monitoring: Set up monitoring for VPS resources (CPU, RAM, Disk I/O, Network) and bot logs for prompt problem detection.

Conclusion

A successful MEV bot requires not only complex logic and algorithms but also flawless infrastructure. A high-performance VPS with NVMe drives, a powerful CPU, and low latency, offered by Valebyte.com, is the foundation for competitiveness in this high-speed game. Investments in quality hosting and your own RPC node pay off by minimizing gas costs and maximizing execution speed, which allows for effective implementation of strategies like sandwich attacks and profit extraction from MEV opportunities on Ethereum.