EIP4337 reference modules

Bundler

A basic eip4337 "bundler"

• expose a node with a minimal RPC calls:
  • eth_sendUserOperation to send a user operation
  • eth_supportedEntryPoints to report the bundler's supported entry points
  • eth_chainId

Usage:

1. run yarn && yarn preprocess
2. start hardhat-node with yarn hardhat-node (or local geth)

In another Window:

3. deploy contracts with yarn hardhat-deploy --network localhost
4. run yarn run bundler so it will listen on port 3000

To run a simple test, do yarn run runop --deployDeployer --network localhost

The runop script:

• deploys a wallet deployer (if not already there)
• creates a random signer (owner for wallet)
• determines the wallet address, and funds it
• sends a transaction (which also creates the wallet)
• sends another transaction, on this existing wallet
• (uses account[0] or mnemonic file for funding, and creating deployer if needed)

NOTE: if running on a testnet, you need to supply the bundler (and runop) the network and mnemonic file, e.g.

yarn run bundler --network localhost --mnemonic file.txt

sdk

SDK to create and send UserOperations see SDK Readme

utils

internal utility methods/test contracts, used by other packages.