Definition
A bundler is a specialized network role in account abstraction–enabled blockchain environments that aggregates user operations into transaction bundles and submits them to the underlying chain. It monitors a dedicated mempool for user operations, constructs valid bundles according to protocol rules, and broadcasts them through an RPC interface, typically assuming responsibility for gas payment and transaction inclusion logistics on behalf of abstracted accounts.
In Simple Terms
A bundler is a network participant that collects many user operations, groups them together, and sends them to the blockchain as regular transactions. It acts as an intermediary between smart accounts and the base chain, handling the technical details of getting those operations included in blocks.
Context and Usage
The term bundler is primarily used in discussions of account abstraction architectures, where user operations are distinct from raw blockchain transactions. Bundlers interact closely with a specialized mempool and RPC endpoints that expose user-operation–specific methods. They are often mentioned alongside entities that enable gasless transaction flows or relaying models, since they occupy the role that bridges higher-level account abstractions with the chain’s native transaction layer.