GasFee Calculation

[BitOrdev]

{
  sender: '0x21Bb1F7E04d86E341B9E0Bcd13bB9EBB02d00411',
  nonce: 1n,
  callData: '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',
  callGasLimit: 312864n,
  verificationGasLimit: 89578n,
  preVerificationGas: 55184n,
  maxFeePerGas: 8231087885n,
  maxPriorityFeePerGas: 902400n,
  signature: '0xd2614025fc173b86704caf37b2fb447f7618101a0d31f5f304c777024cef38a060a29ee43fcf0c46f9107d4f670b8a85c2c017a1fe9e4af891f24f0be6ba5d671c',
  factory: '0x7702',
  factoryData: null,
  paymaster: null,
  paymasterVerificationGasLimit: null,
  paymasterPostOpGasLimit: null,
  paymasterData: null,
  eip7702Auth: {
    chainId: '0x01',
    address: '0xe6Cae83BdE06E4c305530e199D7217f42808555B',
    nonce: '0x9e',
    yParity: '0x0',
    r: '0x4277ba564d2c138823415df0ec8e8f97f30825056d54ec5128a8b29ec2dd81b2',
    s: '0x1075a1bec7f59848cca899ece93075199cd2aabceb0654b9ae00b881a30044cd'
  }
}

How much will it cost to make this transaction? in Eth ?

[Sednaoui]

I am assuming you are looking to calculate the cost of this UserOp using a Paymaster on Ethereum Mainnet to sponsor its gas given your previous discussions. To sponsor this UserOperation given the current gas prices, the final estimated max cost is approximately 0.0096 ETH.

This total includes a standard safety multiplier applied by the paymaster. Here's a clear breakdown of the calculation.

---

Calculation Breakdown

The total cost is determined by first calculating a base cost from the UserOperation's gas values and then applying the paymaster's sponsorship policy.

Step 1: Calculate the Total Gas Limit

The total gas limit is the sum of all gas-related fields in the operation. This includes estimates for the paymaster's own gas usage.

• callGasLimit: 312,864
• verificationGasLimit: 89,578
• preVerificationGas: 55,184
• paymasterVerificationGasLimit: 60,000 (Assumed)
• paymasterPostOpGasLimit: 65,000 (Assumed)

Formula:
$$\text{Total Gas Limit} = 312,864 + 89,578 + 55,184 + 60,000 + 65,000 = \mathbf{582,626}$$

Step 2: Calculate the Base Cost

The base cost is the total gas limit multiplied by the maxFeePerGas. This gives the maximum potential cost of the operation itself, before any additional paymaster logic.

Formula:
$$582,626 \times 8,231,087,885 \text{ wei} = 4,795,645,810,086,010 \text{ wei}$$
$$\frac{4,795,645,810,086,010}{10^{18}} \approx \mathbf{0.0048 \text{ ETH}}$$

---

Paymaster Safety Multiplier

To protect against network gas price volatility and ensure a transaction is mined successfully, paymasters often charge for more gas than the strict base cost. For sponsoring a single transaction on Ethereum Mainnet, Candide's Paymaster roughly applies a 2x safety multiplier.

---

Final Estimated Cost

Applying this 2x multiplier to the base cost gives the final amount needed to sponsor the UserOperation.

Formula:
$$\text{Final Cost} = \text{Base Cost} \times 2$$
$$0.00479564581008601 \text{ ETH} \times 2 = \mathbf{0.00959129162017202 \text{ ETH}}$$

The calculations we've been doing are for the maximum potential cost. This is the amount your account must be able to cover for the transaction to be considered valid by the network.

However, the final charge is based only on the gas actually consumed during execution, which is almost always lower than the limit. The unused portion of the gas cost is never spent.