I would like to be able to simulate transactions with smart contracts based on their solidity source code. The process should be entirely automated.

While I am aware that some tools allow forking the chain at a given point in time, this generally requires me to start local nodes. It also does not scale well if I need information from many contracts at random block numbers.

Would there be some tool (ideally usable with Python) that allows mimicking a smart contract's state locally (and offline) based on its solidity source code? The idea would be that I can recreate transactions submitted to it and "roll-forward" its state to any point of time that I need it to without the need of forking and node providers. E.g., something like a local EVM runtime may do the trick but I am not sure how to set one up without also needing to run a node.

NOTE: Upon researching this question I came across py-evm, which seems to offer something in the direction I am looking for. The project looks solid, but it seems to still be under development and the documentation is a little sparse. Is there possibly a more mature tool around?

  • tenderly.co might be what you're looking for
    – Foxxxey
    Commented Jun 18, 2023 at 16:09

1 Answer 1


There are dump and dump-restore commands in 0xweb CLI tool. Depending on the local setup, here is an example for hardhat:

$ npm i 0xweb -g
$ 0xweb c dump 0x... --sources ./contracts/DumpDemo.sol --output ./dump/data/DumpDemo --chain hardhat

This generates two files:

  1. ./dump/data/DumpDemo.json - the key-value json of all contract's state variables
  2. ./dump/data/DumpDemo.csv - raw slot-value csv of contract's storage

Now, when you have deployed same contract under another address, you can populate the contracts storage with the dump back on-chain:

$ 0xweb c dump-restore 0x... --sources ./contracts/DumpDemo.sol --file ./dump/data/DumpDemo.csv --chain hardhat

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