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Each time i see bot frontrun it's a contract address. Why it's a contract address ? People who use bot are not able to use their ethereum address directly ? or there is a benefit to use contract address maybe ?

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A contract can do some things that a regular address (EOA) cannot do:

  • decrease gas costs by taking advantage of gas refunds (self destruct calls, e.g. CHI gas token)
  • batch multiple contract calls into one transaction
  • take a flashloan, make profit, repay it within a single transaction

Frontrunners, arbitrageurs, etc. tend to employ such techniques. That's why most bots don't show EOA but contract addresses.

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