Send Transactions
Send gasless transactions and estimate fees.
This guide explains how to send a gasless transaction, estimate fees, reuse a recent quote, and use a custom paymaster token.
Send a Gasless Transaction
You can send a transaction with gas fees paid in the paymaster token using account.sendTransaction():
const result = await account.sendTransaction({
to: '0x742d35Cc6634C0532925a3b8D4C9db96C4b4d8b6',
value: 1000000000000000n // 0.001 ETH in wei
})
console.log('Transaction hash:', result.hash)
console.log('Fee paid in paymaster token:', result.fee)ERC-4337 transactions are gasless for the end user. Gas fees are paid through the configured paymaster using the specified paymaster token (e.g., USD₮).
Estimate Fees
You can estimate the fee for a transaction without broadcasting it using account.quoteSendTransaction():
const quote = await account.quoteSendTransaction({
to: '0x742d35Cc6634C0532925a3b8D4C9db96C4b4d8b6',
value: 1000000000000000n
})
console.log('Estimated fee:', quote.fee)Reuse a Recent Quote
Quotes are cached for up to 2 minutes. If you call sendTransaction() with the same transaction during that window, the account checks the current on-chain nonce before reusing the cached UserOperation. If the nonce has moved, it builds a fresh quote before sending.
const tx = {
to: '0x742d35Cc6634C0532925a3b8D4C9db96C4b4d8b6',
value: 1000000000000000n
}
const quote = await account.quoteSendTransaction(tx)
console.log('Estimated fee:', quote.fee)
const result = await account.sendTransaction(tx)
console.log('Transaction hash:', result.hash)Send with Custom Paymaster Token
You can override the default paymaster token for a specific transaction by passing a config object to account.sendTransaction():
const result = await account.sendTransaction({
to: '0x742d35Cc6634C0532925a3b8D4C9db96C4b4d8b6',
value: 1000000000000000n
}, {
paymasterToken: {
address: '0x68749665FF8D2d112Fa859AA293F07A622782F38' // XAUT
}
})Next Steps
Learn how to transfer ERC-20 tokens.