---
title: Why do I need ETH to Send digital assets that aren’t ETH?
description: Coins that are issued on the Ethereum blockchain are called ‘ERC-20’ tokens, including ETH, SHIB, USDC & USDT. ERC-20 tokens require Ethereum (ETH) to pay...
---
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# Why do I need ETH to Send digital assets that aren’t ETH?
## Sending digital assets with ETH gas fees
Some digital assets in RockWallet are built on the **Ethereum blockchain** and are known as **ERC-20 tokens**. These tokens rely on Ethereum (ETH) to pay for **gas (network) fees** that process and confirm transactions on the blockchain.
This means you’ll need a small amount of **ETH in your RockWallet** anytime you send, swap, or sell ERC-20 tokens.
---
💡 **Tip:** Gas fees vary based on network activity and speed settings, so it’s a good idea to keep **$5–$15 worth of ETH** in your wallet to cover future transactions.
You can easily **buy ETH** in the RockWallet app using a **debit card or credit card**, or **receive ETH** from another wallet to cover your gas costs.
---
The **$30 minimum ETH purchase** is set within the app (not by the network) to help make sure you have enough to cover these variable fees. This helps prevent your transactions from failing or getting stuck if network costs spike unexpectedly.
You can always check current Ethereum gas fees using a gas tracker before you transact.
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