The Gelato Bundler is a versatile and production-ready solution for ERC-4337, supporting all major EVM networks and various paymaster models, including Verifying Paymasters and ERC20-based paymasters. However, the key difference between Gelato Bundler and traditional bundlers is that it introduces an additional way to sponsor gas—via Gas Tank. Unlike other bundlers that rely solely on on-chain paymasters per network, Gelato Bundler allows gas sponsorship through a unified gas tank deployed on Polygon, making multi-chain gas sponsorship seamless. Read more about Gas Tank here.
Important: When using Gelato Bundler for Sponsoring Transactions with Gas Tank, both maxFeePerGas and maxPriorityFeePerGas are set to 0. This allows transaction fees to be accurately settled post-execution, rather than upfront via the EntryPoint.
Additionally, when sending UserOperations through the Gelato Bundler, the returned userOpHash also offers enhanced features such as an efficient way to track the status of your operations. It also supports real-time WebSocket status updates. Learn more about features and how to use them here.

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Key Advantages

  1. Universal Sponsorship & Payment Options
    • Compatible with Verifying Paymasters & ERC20-based Paymasters
    • Allows users to pay gas with ERC-20 tokens directly from their smart accounts
    • Supports self-custodial native gas payments
  2. Precision & Efficiency
    • No overpayments – only the exact gas consumed is deducted
    • Eliminates the need for prefunding transactions
    • Allows predictable and efficient fee management
  3. Instant Inclusion & MEV Protection
    • No bundling delays – transactions are processed individually
    • Flashbots integration provides protection against front-running on Ethereum
  4. Unlimited Validation Logic
    • No opcode restrictions or gas limits
    • Supports advanced signature verification and authentication flows
  5. Built on Existing Relay Infrastructure Since Gelato Bundler is built on Gelato’s proven Relay infrastructure:
    • UserOp status can be easily checked
    • Debugging becomes more efficient using the Relay API
  6. Production-Ready & Scalable
    • Trusted by leading Web3 projects
    • Designed to scale seamlessly with your dApp’s growth