Bundler Client actions reference

The following actions are related to the Viem Bundler Client used to execute on a MetaMask user's behalf.

sendUserOperationWithDelegation

Sends a user operation with redeem permissions according to the ERC-7710 specifications.

info

To use sendUserOperationWithDelegation, the Viem Bundler Client must be extended with erc7710BundlerActions.

Parameters

See the Viem sendUserOperation parameters. This function has the same parameters, except it does not accept callData.

Objects in the calls array also require the following parameters:

Name	Type	Required	Description
delegationManager	Address	Yes	The address of Delegation Manager.
permissionsContext	Hex	Yes	Encoded calldata for redeeming permissions. If you're not using ERC-7715, you can use the redeemDelegations utility function to generate the calldata manually.

Example

• example.ts
• client.ts

import { sessionAccount, bundlerClient, publicClient } from "./client.ts";

// These properties must be extracted from the permission response.
const permissionsContext = permissionsResponse[0].context;
const delegationManager = permissionsResponse[0].signerMeta.delegationManager;

// Calls without permissionsContext and delegationManager will be executed 
// as a normal user operation.
const userOperationHash = await bundlerClient.sendUserOperationWithDelegation({
  publicClient,
  account: sessionAccount,
  calls: [
    {
      to: sessionAccount.address,
      data: "0x",
      value: 1n,
      permissionsContext,
      delegationManager,
    },
  ],
  // Appropriate values must be used for fee-per-gas. 
  maxFeePerGas: 1n,
  maxPriorityFeePerGas: 1n
});

import { createPublicClient, http, createBundlerClient } from "viem";
import { generatePrivateKey, privateKeyToAccount } from "viem/accounts";
import { sepolia as chain } from "viem/chains";
import { createBundlerClient } from "viem/account-abstraction";
import { erc7710BundlerActions } from "@metamask/delegation-toolkit/experimental";
import { toMetaMaskSmartAccount, Implementation } from "@metamask/delegation-toolkit";

export const publicClient = createPublicClient({
  chain: chain,
  transport: http(),
});

// Your session account for requesting and redeeming should be the same.
const privateKey = "0x...";
const account = privateKeyToAccount(privateKey);

export const sessionAccount = await toMetaMaskSmartAccount({
  client: publicClient,
  implementation: Implementation.Hybrid,
  deployParams: [account.address, [], [], []],
  deploySalt: "0x",
  signer: { account },
});

export const bundlerClient = createBundlerClient({
  transport: http(
    `https://your-bundler-url`
  ),
  // Allows you to use the same Bundler Client as paymaster.
  paymaster: true
}).extend(erc7710BundlerActions());