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Now that ethereum has switched to using a base and priority fee system, what does tx.gasprice represent in solidity? Would calculating tx.gasprice - block.basefee give me the priority fee for the transaction?

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  • Were you able to find the answer for this @jonah?
    – pbsh
    Commented Mar 4, 2022 at 17:19
  • yes. tx.gasprice - block.basefee does equal the priority fee per gas. At least that's what I concluded from sending test transactions to my solidity contract.
    – Jonah
    Commented Mar 5, 2022 at 19:17

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As specified by the EIP:

The GASPRICE (0x3a) opcode MUST return the effective_gas_price

priority_fee_per_gas = min(transaction.max_priority_fee_per_gas, transaction.max_fee_per_gas - block.base_fee_per_gas)
effective_gas_price = priority_fee_per_gas + block.base_fee_per_gas

So tx.gasprice returns the actual gas price of the transaction (even post -1559)

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