When you think of Ethereum, you probably think of smart contracts, NFTs, or DeFi apps. But beneath all that innovation lies a simple standard that keeps everything running smoothly: ERC-20. If you’ve ever bought or traded an Ethereum-based token, chances are it was ERC-20 compliant.
ERC-20 in a Nutshell
ERC-20 stands for Ethereum Request for Comments 20. It’s a technical standard that defines how fungible tokens (tokens that are interchangeable, like ETH or USDC) should behave on the Ethereum blockchain.
Instead of reinventing the wheel for every new project, developers can follow the ERC-20 framework to ensure their tokens will work seamlessly with wallets, exchanges, and other dapps.
What Does “ERC” Mean?
“ERC” is short for Ethereum Request for Comments, a type of proposal developers use to suggest improvements to the Ethereum network. Each proposal is given a unique ID number—ERC-20 just happens to be the twentieth one.
Here’s how it works:
- A developer submits a proposal outlining rules or functions.
- The Ethereum community reviews and debates it.
- If the proposal is accepted, it becomes a standard.
That’s how ERC-20 became the go-to standard for fungible tokens on Ethereum.
Why ERC-20 Matters
Before ERC-20, every token on Ethereum worked differently. Wallets and exchanges had to build custom integrations for each new asset—a messy and time-consuming process.
ERC-20 solved this by introducing a common set of rules for tokens. Those rules define basic functions like:
- How tokens are transferred between accounts
- How balances are tracked
- How tokens can be approved for use by third-party apps
The result? Consistency. An ERC-20 token created today will work with a wallet built years ago—as long as both follow the same standard.
This interoperability is why most initial coin offerings (ICOs) and many of today’s stablecoins, governance tokens, and DeFi assets are ERC-20 tokens.
How ERC-20 Tokens Are Created
ERC-20 tokens are built using smart contracts—self-executing pieces of code deployed on the Ethereum blockchain.
To qualify as ERC-20, a token contract must implement specific functions (such as transfer, balanceOf, and approve). Once deployed, these functions govern how tokens are issued, moved, and managed.
Because all ERC-20 tokens follow the same rules, they’re fungible. One USDC is worth the same as another USDC, just as one dollar bill equals another.
Using ERC-20 Tokens
If you’ve interacted with Ethereum at all, you’ve likely used ERC-20 tokens. They can be:
- Traded on decentralized exchanges like Uniswap
- Stored in any ERC-20 compatible wallet (including MetaMask, Phantom, and Ledger devices)
- Staked or lent in DeFi protocols
- Paid with for goods and services that accept crypto
Transactions involving ERC-20 tokens require gas fees, which are paid in ETH, Ethereum’s native currency.
Key Takeaways
- ERC-20 = Ethereum Request for Comments 20, a technical standard for fungible tokens.
- It provides a shared set of rules for token creation and transfer.
- It solved early compatibility issues, enabling wallets and exchanges to support thousands of tokens without custom code.
- Most major Ethereum tokens—stablecoins, governance tokens, and DeFi assets—are ERC-20.
Why It’s Still Relevant
ERC-20 may sound like an old standard (it dates back to 2015), but it remains the backbone of Ethereum’s token economy. Without it, Ethereum wouldn’t have become the home of DeFi, ICOs, or the countless tokens that drive today’s Web3 economy.
In short: if Ethereum is a global computer, ERC-20 is one of its most important operating rules.
