Table of Contents
Introduction
The ERC-20 token standard revolutionized Ethereum by establishing a universal framework for token creation. This guide explores its specifications, use cases, and impact on decentralized applications.
What is ERC-20?
ERC-20 (Ethereum Request for Comments 20) is a technical standard for fungible tokens on the Ethereum blockchain. It defines a common set of rules that all Ethereum tokens must follow, ensuring interoperability across wallets, exchanges, and dApps.
👉 Discover how ERC-20 tokens power DeFi ecosystems
Key Features of ERC-20 Tokens
- Standardized Interface: Uniform functions like
transfer()andbalanceOf() - Interoperability: Works seamlessly with Ethereum-based services
- Flexibility: Supports optional metadata (token names, symbols)
- Security: Built-in approval system for third-party spending
Technical Specifications
Methods
| Function | Description | Optional |
|---|---|---|
totalSupply() | Returns total token supply | No |
balanceOf() | Checks account balance | No |
transfer() | Sends tokens to address | No |
approve() | Authorizes third-party withdrawals | No |
allowance() | Checks remaining approved amount | No |
Events
- Transfer: Logs token movements between addresses
- Approval: Records authorization of spending limits
👉 Explore top ERC-20 token use cases
Implementations
Popular implementations include:
- OpenZeppelin's audited contracts
- ConsenSys' gas-optimized version
Historical Context
Proposed in 2015 by Fabian Vogelsteller and Vitalik Buterin, ERC-20 became the foundation for:
- ICO boom (2017-2018)
- DeFi tokenization
- NFT wrapper standards
FAQs
What makes ERC-20 tokens different from Bitcoin?
ERC-20 tokens are smart contract-based assets on Ethereum, while Bitcoin is a standalone blockchain currency.
Can ERC-20 tokens be mined?
No - they're minted through smart contracts with predetermined supply rules.
Why do some tokens have 18 decimals?
This convention allows flexible representation of values, similar to ETH's divisibility.
How do wallets detect ERC-20 tokens?
Wallets scan the blockchain for contracts implementing standard ERC-20 functions.
What's the gas cost for ERC-20 transfers?
Typically 40,000-60,000 gas, depending on contract complexity.
Can ERC-20 tokens be upgraded?
Yes, through proxy patterns or migration contracts, though this requires careful design.
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