SCA UserOperation Gas Estimation calculation

[AbhishekCDN]

Description

We are using the buildUserOperation function of the modular account client to fetch the Gas Estimation for a UserOperation.

We get three fields

1. callGasLimit
2. verificationGasLimit
3. preVerificationGas

What calculations should we perform on these to get a single-value network fee estimate for UO to show on UI?

Current Implementation

We add up all three
let network_fee = (callGasLimit + verificationGasLimit + preVerificationGas) * gasPrice

Inference

Sometimes using the above method gives a much lower value, than what we get when sending the UO.

[avarobinson]

Hi @AbhishekCDN - you should not need to do any additional estimates.

What do you mean by "show on UI"? You can use the sendUserOperation call directly to estimate gas and send the UO. The values will fluctuate each time estimates are run depending on network activity.

[AbhishekCDN]

Hey @avarobinson ,
Well if you have used any wallet app like Trust Wallet, or Metamask
These show network fee estimates before sending any transaction right? That is what I mean for show on UI

like in this image the estimated fee is shown