Open Sourcing Rundler 🦀
By open sourcing Rundler we hope to spur innovation in the ERC-4337 ecosystem, accelerate the smart account transition, and achieve next level user experiences on EVM blockchains.
ERC-4337 Gas Estimation for L2s and Signature Aggregators
Learn how Alchemy's ERC-4337 Bundler handles gas estimation for gas fees that are not metered by the entry point contract including signature aggregators and layer 2 transactions including Optimism and Arbitrum.
ERC-4337 Dummy Signatures and Gas Token Transfers
Learn how to get preVerificationGas and verificationGasLimit fields during the user operation gas estimation process using a dummy signature and dummy paymasterAndData value.
How User Operation Fees are Estimated and Charged
Learn how bundlers are incentivized, how bundlers estimate user operation gas fees, and how senders estimate user op fees on Arbitrum and Optimism.
How ERC-4337 Gas Estimation Works
Learn how Alchemy engineers developed an ERC-4337 bundler in Rust that provides accurate user operation gas estimations, and explore suggested changes to the entry point contract to make the gas estimation process easier.