@biconomy/bundler

Biconomy Bundler is a TypeScript library for interacting with ERC-4337 bundler nodes. It provides methods to estimate gas, send UserOperations, and fetch receipts/hashes. Current version 4.6.2 (actively maintained, frequent releases). Key differentiator: part of the Biconomy Smart Account ecosystem, integrates seamlessly with Biconomy paymasters and relayer services. Supports multiple EVM chains and provides a standardized IBundler interface.