Crypto news uses the words "coin" and "token" almost interchangeably. In casual conversation that is fine. In your wallet, though, the difference has real consequences: it decides what pays your fees, how a swap is built, and why some mistakes cost you money. This guide explains the distinction in plain terms and shows where it shows up on Base.
The short version
A coin is the native asset of a blockchain. It is built into the network itself. On Base, that asset is ETH.
A token is an asset created by a smart contract that lives on top of a blockchain. On Base, USDC, WETH, and almost everything else you can swap is a token.
The rule of thumb: a coin is part of the network, while a token is a contract running on the network.
What makes a coin special
A blockchain needs something to pay the people and machines that keep it running, and something to stop spam. The native coin does both jobs.
On Base, every transaction costs a fee, and that fee is paid in ETH. Even if you only want to move USDC, you need a small amount of ETH in the same wallet to cover the gas. A token cannot do this job, because the network's own rules do not know about it. Only the native coin is recognized at the lowest level.
Native coins also work differently under the hood. Your ETH balance is a number stored directly in the network's account data. Sending ETH is a built-in operation of the network, not a call to a separate contract.
Base is an Ethereum layer 2 network, and ETH on Base is the same asset as ETH on Ethereum, moved across through a bridge. If you want the background on how that works, see our guide to how to get ETH on Base and our explainer on how Base stays secure.
What makes a token different
A token is a smart contract that keeps a ledger. The contract stores a table that says "this address owns this many units." When you send a token, you are not moving something that lives in your wallet. You are asking the contract to update its table so that your balance goes down and someone else's goes up.
This has a few practical effects.
Tokens follow a shared standard. Most fungible tokens on Base follow ERC-20, a common rulebook for reporting balances and handling transfers. That is why a single wallet can display thousands of different tokens. We cover the standard in what is an ERC-20 token.
Anyone can create one. Deploying a token contract is cheap and needs no permission. That is why the ecosystem is full of legitimate projects and also full of copycats and scams. A coin has one canonical version. A token named "USDC" can be created by anyone, so you have to check that you are holding the real one. See spotting scam tokens on Base and how to research a token before you swap it.
The contract's rules apply to you. A token can have features such as the ability for its owner to pause transfers, mint more supply, or block specific addresses. A coin's rules are set by the network itself. A token's rules are set by whoever wrote the contract. Our article on token owner privileges explains what to look for.
Approvals exist. For a decentralized app to move your token, you usually have to grant it an approval. Native ETH does not use approvals in the same way, because you send it along with the transaction itself. This is why token approvals are something to manage carefully.
Where the difference shows up on Base
Paying fees
You always pay gas in ETH. If your wallet holds USDC and no ETH, you generally cannot send that USDC, because there is nothing to pay the fee with. Some setups sponsor fees on your behalf, which we describe in gasless transactions and paymasters, but by default you need ETH.
A practical habit follows from this: keep a small ETH balance for fees, separate from whatever you plan to swap.
Swapping ETH
Trading contracts are built around the token standard, and native ETH does not follow it. So when a swap involves ETH, the app often converts it into WETH, an ERC-20 token backed one to one by ETH, behind the scenes. You can read the details in why your swap sometimes wraps your ETH. From your point of view it is still a normal swap.
Sending to the wrong place
Because a coin lives in the network and a token lives in a contract, sending them to the wrong destination causes different problems. Sending tokens to a contract that cannot handle them can leave them stuck. Sending assets on the wrong network is a separate risk, covered in what happens if you send tokens to the wrong network.
Reading the block explorer
On a block explorer such as BaseScan, native ETH transfers and token transfers appear in different places. A plain ETH transfer shows up as a normal transaction with a value. A token transfer appears as an event log emitted by the token contract, listed under token transfers. If you send a token and only look at the ETH value field of the transaction, you might think nothing moved. Our guide to using a block explorer shows where to look.
A note on terminology
You will sometimes see people call every crypto asset a "coin," including tokens. The word "altcoin" is used the same way. The technical distinction is the one above: native to the network versus created by a contract on top of it. Different sources draw the line slightly differently, and a few assets sit in gray areas, such as wrapped versions of a coin that are technically tokens even though they represent the coin. When precision matters, the safest question to ask is: "Is this the network's own asset, or a contract's ledger entry?"
Quick reference
| Coin | Token | |
|---|---|---|
| Example on Base | ETH | USDC, WETH |
| Built into the network | Yes | No, it is a smart contract |
| Pays gas fees | Yes | No |
| Needs an approval to be spent by an app | Usually no | Usually yes |
| Who sets the rules | The network | The contract's author |
| Can anyone create one | No | Yes |
What to take away
- ETH is the coin on Base and pays for every transaction. Keep a little for gas.
- Almost everything else you hold is a token, which is a contract's record of who owns what.
- A token's name and symbol prove nothing. Anyone can create a token with any name, so verify the contract before you trust it.
- Tokens come with rules, approvals, and permissions that a coin does not have, so they deserve a little more caution.
Understanding this one distinction makes many other things click into place: why you need gas, why swaps wrap ETH, why approvals exist, and why scam tokens are so easy to make. It is not financial advice, just a mental model that helps you read what your wallet is actually showing you.