🏃‍♂️NFT Mempool Frontrunner

Frontrunning mempool transactions

Introduction

The frontrunner is a mempool explorer with functionality built in to:

• Copy transaction data

• Filter transactions

• Frontrun gas

• Rotate through your wallets on each click - sniping transactions

• Monitor the current block and time until next block

Examples

Token ID Claim Frontrunning

Leverage the work of other bots to find the unclaimed token IDs for you - and frontrun them, costing them gas, and bagging you a shiny new token.

An example of this is the Worms mint:

https://etherscan.io/tx/0x779edc5fcddc3e1d380d21eeb5752e6e364d37399ce220eb5dc3488e9825f0ee

Signature Frontrunning

Following an almost identical principle as above, certain signature-gated mints have signatures that can be easily copied for another sender address. A good example that we intentionally didn't share (since we had a working module) but people could have exploited, was frontrunning Chewz mint transactions.

https://etherscan.io/tx/0xa37b80dc3419b3b85f07093d3073f4ea43bfae749d0cc478e226a615ce42c5ff

Functionality

Prerequisites

You must have an Alchemy API key added to your Settings. You can get a key once you sign up and create an app here.

Step 1. Open Frontrunner

The frontrunner can be accessed from the Mint Bot tab. It is adjacent to the "Drops" section.

Step 2. Set Contract Address

Step 3. Configure Behaviour

Frontrun Gas

This setting lets you choose how much Priority Fee to add to the transaction's gas that you are copying. If the transaction you're frontrunning uses 10 Priority Fee, and you have "Frontrun Gas" set to 5, then the task created via the mint bot will use 15 Priority Fee (10 + 5).

Validate

Some mints may have a "mint to" parameter which sends tokens to a specific address. This will do an extra check that will try to detect this behaviour, and block the copy attempt if the transaction contains this.

If you are aware of the contract beforehand not having this parameter, it is better to turn this off, or you may have issues frontrunning fresh pending transactions.

Immediate

By default, the bot will not execute the frontrun task unless you tick this. Ensure you are aware of what you are doing before you enable this option.

Rotate

Quite often, you will want to snipe multiple transactions but need to use a different wallet. The bot will choose the next highest balance wallet

Disclaimer

The frontrunner is a powerful tool that relies on external data (mempool transactions). Mempool transactions don't stay in there forever, and end up getting confirmed into blocks! From the time the transaction hits the mempool, you will have 6 seconds on average until it ends up in a block.

However, transactions may appear 1 second before the next block, and get confirmed before you even have a chance to frontrun at all. Follow these general tips:

🤓 Read the target contract or ensure you know the frontrunning opportunity well

✍ Filter for the method name or hex that you wish to target

💰 Ensure your wallets have been chosen and they have sufficient balance

⌛ Try to execute as far away from the next block as possible.

• Trying to frontrun 12 seconds away from the next block is infinitely better than 1 second until the next block!

Internal Competition

We have mechanisms in place to attempt to mitigate the chances of frontrunning other Sensei users transactions.