Gas Metering ERC20 Paymaster Script Sometimes Fails

[nlordell]

Description

Originally posted in #478 (review)

The ERC20 paymaster gas metering script does not always fund enough. In particular, it funds the account with 1.0 USDC, but in a recent run, the paymaster required a debit of ~1.8 USDC.

We should change the metering script to be more resilient to changing gas prices and potentially fund the contract more when needed.

[mmv08]

I wanted to do this the last time I worked on benchmarking, but there was no method in Pimlico API for this. I didn't want to spend much time on it and haven't looked into how exactly Pimlico calculates the fee, and they didn't get back to my question: https://5afe.slack.com/archives/C05JA2HFQ1J/p1716898280881779

This may be a little effort because you'll have to read the source code. (Also we don't really run benchmarks that often so maybe a configuration option is sufficient)

[remedcu]

(Also we don't really run benchmarks that often so maybe a configuration option is sufficient)

+1