๐ Token Standard Token Standard
A shared set of rules โ a blueprint โ that a smart contract follows when it creates a token, so the token behaves predictably and fits into any wallet, exchange, or app that knows the same rules.
๐ The simple version โ a USB plug for tokens
Think of a USB plug. Because everyone agreed on one shape, any USB device fits any USB port โ no special adapter needed. A token standard is that agreed shape for crypto tokens. When a developer creates a token, they have its smart contract follow the standard's rulebook: a fixed list of functions for things like sending tokens, checking a balance, and approving a spend. Once a wallet or exchange learns those rules once, it can handle any token that follows them.
โป๏ธ Why it matters โ one integration, thousands of tokens
Without a shared standard, every wallet would need custom code for every single token. With a standard, apps write the integration once and it works for everything compliant. This property is called interoperability. It's the reason you can send many different tokens to the same wallet address and trade them on the same exchange without any special setup โ and it's why thousands of tokens could be launched so quickly.
๐ Fungible vs non-fungible
The first thing a beginner meets is that not all tokens are the same kind. That split decides which standard a token uses.
| Type | What it means | Common standard |
|---|---|---|
| ๐ต Fungible | Every unit is identical and interchangeable, like dollar bills | ERC-20 |
| ๐ผ๏ธ Non-fungible (NFT) | Each token is unique and not interchangeable, like a specific painting | ERC-721 |
๐ The main Ethereum standards
| Standard | What it's for | Real examples |
|---|---|---|
| ERC-20 | Fungible tokens โ the most widely used standard; the blueprint for most stablecoins and project tokens | USDT, LINK |
| ERC-721 | Non-fungible tokens (NFTs) โ each token has a unique ID for one asset | Art, collectibles |
| ERC-1155 | 'Multi-token' โ one contract can hold both fungible and non-fungible tokens for efficient, bundled transfers | Game items |
๐ 'ERC' stands for Ethereum Request for Comments โ the public proposal process. Numbers like 20 and 721 are just the proposal IDs.
๐ Other blockchains, other standards
Ethereum isn't the only network with token standards. Other chains have their own:
- ๐ก BEP-20 โ BNB Smart Chain (modeled on ERC-20)
- ๐ฃ SPL โ Solana
- ๐ด TRC-20 โ Tron
๐จ Things beginners should know
- ๐ก๏ธ Standard โ safe โ Following a standard only means a token plugs in correctly; it says nothing about whether the project is honest or the code is bug-free
- ๐ It's not a coin or a network โ A standard is a rulebook; many tokens share one, and one blockchain can support several
- ๐ฌ Right network matters โ A token's standard is tied to its blockchain; sending it on the wrong network can lose your funds
โ FAQ
- Is a token standard the same thing as a coin or a blockchain?
- No. It's a rulebook, not a coin and not a network. Many different tokens can share one standard โ thousands of tokens are all ERC-20 โ and a single blockchain can support several standards at once.
- Does following a token standard mean a token is safe?
- No. A standard only guarantees that the token plugs into wallets and apps the same way as others. It says nothing about whether the project is honest or the code is free of bugs. A scam token can still be a perfectly valid ERC-20.
- Why can I send many different tokens to the same wallet address?
- Because those tokens follow the same standard. The wallet knows the shared rules once, so it can hold and display any token that speaks the same language โ no special setup per token.