> ## Documentation Index
> Fetch the complete documentation index at: https://developers.fireblocks.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Gas Management Overview

> Stop funding each vault account with gas by hand. Compare gasless transactions, where a relay pays the fee, with Gas Station, which auto-fuels vault accounts.

## Overview

Every on-chain transaction pays a network fee in the chain's native asset, such as ETH on Ethereum or SOL on Solana. By default, the source vault account pays that fee, so it must hold the native asset alongside the tokens it sends. Funding many vault accounts with gas by hand is slow and error-prone. Fireblocks gives you two ways to remove that work.

| Tool                                                   | What it does                                                                          | Use it when                                                          |
| ------------------------------------------------------ | ------------------------------------------------------------------------------------- | -------------------------------------------------------------------- |
| [**Gasless transactions**](/docs/gasless-transactions) | A relay vault account pays the fee, so the source vault account holds no native asset | You send tokens on EVM or Solana                                     |
| [**Gas Station**](/docs/work-with-gas-station)         | Automatically tops up vault accounts with the native asset                            | Vault accounts need to hold the native asset, for example to send it |

## Gasless transactions or Gas Station?

They differ in whether the native asset ever reaches the source vault account.

|                                       | Gasless transactions                                                               | Gas Station                                      |
| ------------------------------------- | ---------------------------------------------------------------------------------- | ------------------------------------------------ |
| How the fee is paid                   | A relay vault account pays it on the source's behalf                               | The source pays it, after Gas Station tops it up |
| Native asset in source vault accounts | Not needed                                                                         | Needed, and refilled automatically               |
| Native asset transfers                | Not covered                                                                        | Covered                                          |
| Chains                                | [EVM](/docs/evm-gasless) (EIP-7702) and [Solana](/docs/solana-gasless) (fee payer) | EVM and TRON                                     |
| Setup                                 | **Settings** > **Initiate gasless transactions**                                   | **Settings** > **Gas Station tank**              |

You can use both: gasless transactions for token transfers, and Gas Station for the vault accounts that also send the native asset.

## Scale the account that pays

A gasless relay and a Gas Station tank are each a single vault account that pays for many others. On EVM, each vault account has one nonce stream, so that account becomes a bottleneck during traffic spikes. To spread the load, select a [Wallet Pool](/docs/wallet-pools#use-cases) as the relay or as the Gas Station tank.

## In this section

* [Gasless Transactions Overview](/docs/gasless-transactions): how gasless works and which mechanism each chain uses.
* [EVM Gasless (Universal Gasless)](/docs/evm-gasless): set up a relay and Policy rules, then send gasless on EVM chains.
* [Solana Gasless](/docs/solana-gasless): set a fee payer and send SPL tokens without SOL.
* [Work with Fireblocks Gas Station](/docs/work-with-gas-station): how Gas Station fuels vault accounts, and its use cases.

## Related

* [Estimate Transaction Fee](/reference/estimate-transaction-fee): estimate fees and set custom fees through the API.
* [Boost Transactions](/docs/boost-transactions): speed up a transaction that is stuck because its fee is too low.