What are these settings for?

This website relies on a JSON RPC connection and an Etherscan API token. For more reliable operation, consider specifying your own. You can get yours by visiting the links below.

Ethereum nodes:
Etherscan api key:

What does “Use built-in ABIs” parameter?

This website includes pre-loaded ABIs for script parsing. If you are having trouble viewing the action items, uncheck this box to load ABIs from Etherscan.