Bundler
An ERC-4337 participant that packages UserOperations into transactions sent through an EntryPoint contract.
In more detail
A bundler connects smart-account requests to the chain by assembling operations and submitting a regular transaction. It's a service role, rather than automatically an Ethereum validator. Availability, validation rules and fee arrangements affect which operations it accepts; the underlying chain still has to include the resulting transaction.
How you might use it
A wallet sends your UserOperation to a bundler, which submits it with other operations in a transaction calling the EntryPoint.
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