Module sponsored 

Sponsored transaction helpers.

This module provides high-level utilities for creating and managing sponsored (fee payer) transactions, where one account pays the gas fees on behalf of another account.

Overview

Sponsored transactions allow a “fee payer” account to pay the gas fees for a transaction initiated by a different “sender” account. This is useful for:

• Onboarding new users - Users without APT can still execute transactions
• dApp subsidization - Applications can pay gas fees for their users
• Gasless experiences - Create seamless UX without exposing gas costs

Example

use aptos_sdk::transaction::{SponsoredTransactionBuilder, EntryFunction};

// Build a sponsored transaction
let fee_payer_txn = SponsoredTransactionBuilder::new()
    .sender(user_account.address())
    .sequence_number(0)
    .fee_payer(sponsor_account.address())
    .payload(payload)
    .chain_id(ChainId::testnet())
    .build()?;

// Sign with all parties
let signed = sign_sponsored_transaction(
    &fee_payer_txn,
    &user_account,
    &[],
    &sponsor_account,
)?;

Structs

PartiallySigned

A partially signed sponsored transaction.

SponsoredTransactionBuilder

A builder for constructing sponsored (fee payer) transactions.

Traits

Sponsor

Extension trait that adds sponsorship capabilities to accounts.

Functions

sign_sponsored_transaction

Signs a sponsored (fee payer) transaction with all required signatures.

sponsor_transaction

Creates a simple sponsored transaction with minimal configuration.