Built-in support for Arbitrum gas fees

[cgewecke]

Proposed as part of #170. It's not clear how accurate fees would be when run on an Ethereum EVM (like HH or Anvil). Arbitrum has special precompiles with their own prices. (Assume the differences are microscopic but unsure.)

One approach is to create an option for an async hook for price resolution that the user can define. Whenever the plugin needs L1gasUsed it could call the relevant estimation endpoints at Arbitrum (as in the JS script linked below). This would be useful primarily for hardhat run, but might be ok for small test suites too. (This strategy Is lower effort but also general purpose)

Higher effort is feature parity with Optimism and would require that we emulate the estimation locally using Brotli compression etc. (Definitely wait till Atlas fork for this)

EIP 4844 Schedule

• ArbOS 20 “Atlas” Proposal (voting ends March 1 - impl TBD)
• testnet?

Resources

• JS gas estimation script (network call)
• Estimation code entrypoint in Nitro (local emulation)
• Gas and Fee documentation
• Gas Estimates documentation

[cgewecke]

Closed via #225. This is in the 2.1.0 release