Using ZeroDev with Gelato

Gelato's has a unique approach to handling transaction fees without the need for an EntryPoint deposit or an on-chain paymaster. Instead, transaction fees are settled post-execution via 1Balance across all supported networks, ensuring accurate charging of gas consumed without necessitating per-chain user deposits. This method relies on setting maxFeePerGas=0, thereby eliminating the need for upfront fee payments (requiredPrefund=0).

For a deeper understanding of Gelato's capabilities, refer to their comprehensive documentation.

ZeroDev SDK with Gelato

Integrating Gelato with our SDK necessitates specific configurations, diverging from conventional bundler setups due to Gelato's distinct fee management mechanism.

Essentail Configurations

• Omit Paymaster: Unlike other services, Gelato's transactions are sponsored without specifying a paymaster. Thus, your account will directly bear the gas fees incurred through Gelato's operations.

Initialization with Preset Options

const kernelClient = await createEcdsaKernelAccountClient({
  // Mandatory fields
  chain,
  projectId,
  signer,
 
  // Gelato-specific optional fields
  provider: "GELATO",
  paymaster: 'NONE',  // Explicitly omit the use of a paymaster
})

Manual Setup without Presets

If opting for a manual configuration, ensure the sponsorUserOperation middleware is not used, as illustrated below (commented out for clarity):

const kernelClient = createKernelAccountClient({
  account,
  chain,
  transport: http(process.env.BUNDLER_RPC),
  // The following is omitted for Gelato integration:
  // sponsorUserOperation: async ({ userOperation }): Promise<UserOperation> => {
  //   const paymasterClient = createZeroDevPaymasterClient({
  //     chain,
  //     transport: http(process.env.PAYMASTER_RPC),
  //   })
  //   return paymasterClient.sponsorUserOperation({
  //     userOperation,
  //  })
  // },
})

Transaction Configuration

When dispatching transactions or user operations through Gelato, it's crucial to set both maxFeePerGas and maxPriorityFeePerGas to 0x0. This ensures compatibility with Gelato's fee settlement approach.

• Sending a Transaction

const txnHash = await kernelClient.sendTransaction({
  to: zeroAddress,
  value: BigInt(0),
  data: "0x",
  // Gelato-specific configurations (you may need to ignore typescript errors)
  maxFeePerGas: "0x0",
  maxPriorityFeePerGas: "0x0",
})

• Dispatching a User Operation

const userOpHash = await kernelClient.sendUserOperation({
  userOperation: {
    callData: await account.encodeCallData({
      to: zeroAddress,
      value: BigInt(0),
      data: "0x",
    }),
    // Gelato-specific configurations (you may need to ignore typescript errors)
    maxFeePerGas: "0x0",
    maxPriorityFeePerGas: "0x0",
  },
})