canSponsorUserOperation

canSponsorUserOperation

Checks if a user operation can be sponsored by the configured paymaster. Works for both single transactions and batch transactions. This is useful to determine if the user will need to pay gas fees or if the operation qualifies for gas sponsorship.

Usage

import { canSponsorUserOperation } from "@dynamic-labs-sdk/zerodev";
import { isEvmWalletAccount } from "@dynamic-labs-sdk/evm";
import { getPrimaryWalletAccount } from "@dynamic-labs-sdk/client";
import { parseEther } from "viem";

const walletAccount = getPrimaryWalletAccount();

if (walletAccount && isEvmWalletAccount(walletAccount)) {
  const canSponsor = await canSponsorUserOperation({
    walletAccount,
    calls: [
      {
        to: recipientAddress,
        value: parseEther("0.01"),
        data: "0x",
      },
    ],
  });

  if (canSponsor) {
    console.log("Operation will be sponsored - no gas fees required!");
  } else {
    console.log("Operation cannot be sponsored - user pays gas fees");
  }
}

Parameters

You must provide either a walletAccount or a kernelClient, but not both.

Parameter	Type	Description
calls	BatchCall[]	Array of calls to execute (single or multiple)
calls[].to	Hex	The recipient address for this call
calls[].value	bigint	The value to send in wei for this call
calls[].data	Hex (optional)	The transaction data for this call
walletAccount	EvmWalletAccount (optional)	The wallet account. Required if no kernelClient is provided
kernelClient	KernelClient (optional)	An existing kernel client. Required if no walletAccount is provided

Returns

Promise<boolean> - Returns true if the user operation can be sponsored, false otherwise.

Examples

Single transaction with wallet account

const canSponsor = await canSponsorUserOperation({
  walletAccount,
  calls: [
    {
      to: "0x...",
      value: parseEther("0.1"),
    },
  ],
});

Batch transaction

const canSponsor = await canSponsorUserOperation({
  walletAccount,
  calls: [
    { to: "0xRecipient1...", value: parseEther("0.1") },
    { to: "0xRecipient2...", value: parseEther("0.2") },
    { to: "0xRecipient3...", value: parseEther("0.3") },
  ],
});

Using existing kernel client

const kernelClient = await createKernelClientForWalletAccount({
  smartWalletAccount: walletAccount,
});

const canSponsor = await canSponsorUserOperation({
  kernelClient,
  calls: [
    {
      to: "0x...",
      value: parseEther("0.1"),
    },
  ],
});

Error handling

import { isGasSponsorshipError } from '@dynamic-labs-sdk/zerodev';

try {
  const canSponsor = await canSponsorUserOperation({ walletAccount, calls });
  console.log('Can sponsor:', canSponsor);
} catch (error) {
  if (isGasSponsorshipError(error)) {
    console.log('Sponsorship check failed - user will need to pay gas');
  }
}

React

Use canSponsorUserOperation inside a button handler to conditionally show a “gasless” badge or adjust UI before sending:

import { canSponsorUserOperation, sendUserOperation } from '@dynamic-labs-sdk/zerodev';
import { isEvmWalletAccount } from '@dynamic-labs-sdk/evm';
import { useWalletAccounts } from '@dynamic-labs-sdk/react-hooks';
import { useState } from 'react';
import { parseEther } from 'viem';

function SponsoredSendButton({ recipientAddress }) {
  const walletAccounts = useWalletAccounts();
  const walletAccount = walletAccounts.find(isEvmWalletAccount);
  const [sponsored, setSponsored] = useState(null);

  const calls = [{ to: recipientAddress, value: parseEther('0.01'), data: '0x' as const }];

  const handleSend = async () => {
    if (!walletAccount) return;
    const canSponsor = await canSponsorUserOperation({ walletAccount, calls });
    setSponsored(canSponsor);
    await sendUserOperation({ walletAccount, calls, withSponsorship: canSponsor });
  };

  return (
    <div>
      <button onClick={handleSend} disabled={!walletAccount}>
        Send {sponsored === true ? '(Gasless)' : ''}
      </button>
    </div>
  );
}

Related functions

• sendUserOperation - Send a user operation (single or batch)
• estimateUserOperationGas - Estimate gas for a user operation
• createKernelClientForWalletAccount - Create a ZeroDev Kernel client
• isGasSponsorshipError - Check if an error is a gas sponsorship error
• Migration guide (v0.9) - Upgrading from the previous transaction API