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Using the ethers.js library, how can I determine the gas limit when sending a transaction to a contract or deploying a new contract?

  • Could you please elaborate on your use case? What are you building, what exactly is the commission for? – iamdefinitelyahuman Nov 9 at 8:11
  • For sending, I use npm ethers module – Артем Филиппов Nov 9 at 9:08
  • When you say commission, do you mean the fee paid to the miners? – iamdefinitelyahuman Nov 9 at 9:10
  • For sending, I use npm ethers module. To send all funds , the formula for receiving the value field is used tx.value = balance - gasLimit * gasPrcie. But when the tx.data field is added, the transaction is not sent due to lack of funds – Артем Филиппов Nov 9 at 9:16
  • Yes "commission" = transaction fee – Артем Филиппов Nov 9 at 9:17
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From the official documentation, see the deployment section from contracts module. The section provides an example of deploying a contract on ropsten. From the contract deployment hash, you can get the idea of different gas parameters:

Transaction Fee: 0.00181826 Ether ($0.000000)

Gas Limit: 363,652

Gas Used by Transaction: 363,652 (100%)

Gas Price: 0.000000005 Ether (5 Gwei)

You can read more about gas estimation from this issue and this issue.

hope it will help.

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