Cover Transaction Fees for Your Users

• Sponsoring the transaction fees on your behalf
• Maintaining a treasury to cover the gas costs
• Securely verifying and rate-limiting each transaction to prevent abuse
• Protecting against common attack vectors when sponsoring gas on chains like Solana
• Calculating optimal fees to ensure transactions land without overpaying

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Prerequisites

• A Crossmint project with wallets enabled
• Access to the Crossmint Console

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Change the Fee Payer

1

Navigate to Wallets Settings

Open the Crossmint Console and go to Wallets → Settings.

2

Choose the Fee Payer

Select who pays transaction fees:

• You — project-sponsored fees. Crossmint covers the gas with your project’s credits and bills your project, so your users never have gas friction.
  Enterprise feature. Contact us for access.
• Executing Wallet — the wallet that performs the transaction pays the gas

When the Executing Wallet is selected as the fee payer for Solana, you can choose whether it pays gas in SOL or USDC.

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Set Spending Limits

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Monitor Sponsored Transactions

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View usage in the Console

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Track transactions with webhooks

// Partial type showing fields used in this example.
// See /wallets/guides/webhooks for the full schema.
type TransferWebhookEvent = {
    type: string;
    data: {
        status: string;
        recipient: { address: string };
        token: { amount: string; symbol: string };
        onChain: { explorerLink: string };
    };
};

async function processTransferEvent(
    event: TransferWebhookEvent
) {
    const { type, data } = event;

    if (
        type === "wallets.transfer.out" &&
        data.status === "succeeded"
    ) {
        console.log("Sponsored transaction completed:");
        console.log(`  To: ${data.recipient.address}`);
        console.log(`  Amount: ${data.token.amount} ${data.token.symbol}`);
        console.log(`  Explorer: ${data.onChain.explorerLink}`);
    }
}

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Best Practices

• Review the default fee payer before launch: For Solana smart wallets, new production projects start with user-paid fees. Make sure the selected mode matches your user experience and budget.
• Monitor usage regularly: Keep track of your gas sponsorship costs to ensure they align with your budget
• Set appropriate limits: Once spending limits are enabled for your project, configure them based on your expected user behavior to prevent abuse
• Use webhooks for real-time tracking: Set up webhooks to monitor sponsored transactions and detect any unusual patterns

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Learn More