Alto is a Typescript implementation of the ERC-4337 bundler specification developed by Pimlico, focused on transaction inclusion reliability.

For a full explanation of Alto, please visit our docs page

Run an instance of Alto with the following commands:

pnpm build
./alto

Run the test suite with the following commands:

pnpm build
pnpm test # note: foundry must be installed on the machine for this to work

• ⚙️ NodeJS (LTS)
• 🧰 Pnpm

• Run Geth node or any other node that support debug_traceCall
• Clone bundler-spec-tests repo.
• build & run bundler with --environment development --bundleMode manual --safeMode true

Distributed under the GPL-3.0 License. See LICENSE for more information.

Feel free to ask any questions in our Telegram group

• Eth-Infinitism bundler
• Lodestar