Questions tagged [flashbots]

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17 views

Solidity re-entrancy attacks and how to guard against them

I'm trying to understand re-entrancy attacks. Is tip1() below at risk of a re-entrancy attack (if the fallback function of the miner's contract invokes tip1() itself)? And if so, is tip2() safe? ...
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10 views

Will this DeFi bot work as is, given that there're front runing bots out there?

Will this bot https://extropy-io.medium.com/coding-a-defi-arbitrage-bot-45e550d85089 work as is, given that there’re front-run bots out there? Or will it necessitate some tweaks first to counter them?
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Best Way to Estimate Gas, Flashbots [duplicate]

I am writing an arbitrage bot that leverages the Flashbots bundle. For those who don't know, if you submit transaction through flashbots if the transaction revert, then you don't pay any gas. My ...
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16 views

Where do bot front bot runners get initial liquidity?

In order to pull off front running attacks or arbitrage, a person who runs a bot has to have enough liquidity, doesn't he? For instance, to beat a transaction of 100 ETH he'll have to do this amount ...
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17 views

Minting an NFT at a much lower gwei than standard

So I was exploring a recent NFT project that dropped the other night and found that a handfull of wallets succeeded in minting around 10% of the supply on a much lower gwei (1/7) than the standard ...
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1answer
61 views

Way to tackle arbitrage bots

I deployed a token ABC and created a liquidity pool in pancakeswap with pair ABC/BNB. But arbitraged bots attacked and stole a large sum of money. How to stop this and why is this occurring? I think ...
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1answer
36 views

MEV explore flashbots

What's the exact definition of Outlier MEV txs currently in review on Flashbot's MEV-explore dashboard? Does it mean that the transactions there are currently under review and the profit (MEV Tx ...
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1answer
348 views

How do frontrunners / sandwich bots work? How do they affect the price in the pool?

I'm trying to understand how frontrunners work in ERC20-Uniswap. Currently, I don't understand how they can "drain" ETH from a transaction. My understanding is that the price of the pool ...
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25 views

Flashbot bundle question

I would like to create a smart contract and place it in a bundle. In the same bundle, I would like to call it and execute it , paying the miner from the second transaction. Is there a simple answer ...
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1answer
992 views

How to conduct a flash loan on PancakeSwap?

Apparently it's possible to take a flash loan on PancakeSwap, being that it's a fork of Uniswap. However, I haven't found any examples anywhere of a flash loan on PancakeSwap, nor do the docs mention ...
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83 views

How do sophisticated generalized frontrunner bots work?

By sophisticated generalized frontrunner bots, I mean the bots that execute a pending mempool transaction and copy profitable internal transactions generated by its execution trace, as mentioned in ...
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427 views

What prevents miners from cooperating and causing intentional chain reorgs?

The top 5 ethereum mining pools currently have more than 60% of the network's hashrate. What prevents these pools from cooperating to cause planned reorgs? There could be many reasons to do it, like ...
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2answers
177 views

What decides the order of transactions in a block?

Transaction order in a block matters, since that's the order those transactions are executed and take effect on the state of the EVM. But what or who decides the order of transactions? Is it hard-...
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1answer
70 views

How do flash loans work?

I am quite new to flash loan and I don't fully understand it. I've been reading on flash loan attacks lately and notice often times it involves a huge dump on Uniswap to skew the price of a coin. I am ...
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1answer
199 views

How my tx become a flashbots / private transaction?

I did swap on Uniswap today, and realized that my tx is frontrunned and it become a flashbots / private transaction. Here is the tx https://etherscan.io/tx/...
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2answers
31 views

Would it be possible to integrate crypto with trading bot?

You can create a trading bot in trading view and see how well your crypto would perform in a given time frame. (I can see how much money would I make if I didn't sell or how much money I would make if ...
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134 views

Gas Error on Uniswap Bot

I'm new to all this and I'm trying to code a bot. The bot is picking up new listings on uniswap but when it goes to put through a transaction I'm getting a gas error. I'm getting.. (node:7820) ...
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1answer
2k views

How to create and send Flashbot transactions?

So far, I only understand flashbot bundles are signed raw transactions with one of them being a bribe to the miner for the mining fee, but : Is the bribing transaction special in the way it is valid ...
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1answer
169 views

Can a flash loan used to flash attack a smart contract?

I am new to flash loans. Let us say I have smart contract where people vote. Your voting power on this contract is based on how many token x you have. The votes are yes and no and the vote with more ...
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1answer
159 views

What decides about the position in the block? [duplicate]

All these transactions happened within the single block: Source: https://etherscan.io/defi?q=0x8a40c222996f9f3431f63bf80244c36822060f12#dextracker Right now it is still possible to get to the initial ...
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1answer
479 views

How are 0 gas price transactions getting mined?

Here's a transaction with a gas price of 0: https://etherscan.io/tx/0xbdda3e1d4d879590b5d21ce777a91573fb5bbb40fa0f6cbcc8420a6d3d208668 How is it getting mined? Is the miner mining it for free?