Voltaire is a modular, developer-friendly and lighting-fast Python Bundler for Ethereum EIP-4337 Account Abstraction. Voltaire is designed to operate within the peer-to-peer mempool of UserOperations, facilitating the inclusion of transactions on-chain more quickly and efficiently.

Voltaire presently has complete coverage of the compatibility test suites written by ERC-4337 team. These test suites ensure that different bundlers can communicate effectively and defend against DDoS attack vectors. While the specification is still under development, all upcoming updates will aim to sustain full compliance coverage.

Voltaire is open-source, meaning that anyone can launch Voltaire and start bundling user operations for a service fee. By enabling anyone to participate in the network, the mempool becomes more robust when facing censorship attacks.

A big of part of our inspiration for Voltaire is Trinity, a previous open-source Ethereum client implementation written in Python. We would like to thank the Trinity team, as well as all Python community members for their open-source contributors.

For a bit of background, EIP 4337 is the account abstraction standard for Ethereum & EVM equivalent chains that doesn't compromise on decentralisation and censorship resistance. In practical terms, this means smart contract wallets that don't depend on centralised relayers controlled by a single entity. The role of centralised relayers is replaced with a p2p network of new entities called Bundlers. As the p2p network is still in development, bundlers currently operate as standalone endpoints until they are able to participate in the unified mempool.