What are ERC-20 tokens?
Ever wondered how thousands of different cryptocurrencies exist on the Ethereum network without needing their own separate blockchains? The answer lies in the ERC-20 standard, a set of rules that allows developers to create compatible tokens with ease. This guide breaks down exactly how these digital assets work and what you need to know before you start trading.
What you need to know
- ERC-20 is a technical standard for creating tokens on the Ethereum blockchain.
- It ensures that all tokens are compatible with Ethereum wallets and exchanges.
- Tokens are not the same as coins; they rely on the Ethereum network to function.
- Smart contracts manage the transfer and balance tracking of these tokens.
- Gas fees are paid in ETH, even when you are moving ERC-20 tokens.
- ERC-20 tokens power most DeFi protocols and decentralized applications.
- Always verify a token's contract address to avoid scams.
- Not all tokens on Ethereum are ERC-20; some use different standards like ERC-721.
- You can store ERC-20 tokens in any wallet that supports Ethereum.
- The standard provides a uniform way for apps to interact with different tokens.
What is an ERC-20 token?
At its core, ERC-20 is a technical standard used for all smart contracts on the Ethereum blockchain for token implementation. Think of it as a blueprint or a set of rules that every token must follow to be considered an 'ERC-20 token.'
Because these tokens follow the same rules, they are easily interchangeable and compatible with various wallets, exchanges, and decentralized applications (dApps). Without this standard, every new token would require its own unique code for every wallet or exchange to recognize it, which would be incredibly inefficient.
How it works
ERC-20 tokens work through smart contracts. When a developer creates a new token, they deploy a smart contract to the Ethereum blockchain that defines the token's name, symbol, and total supply.
- Balance Tracking: The contract keeps a ledger of who owns how many tokens.
- Transferability: It defines how tokens are moved from one wallet address to another.
- Interoperability: Because the code follows the standard, your wallet automatically knows how to display your balance and send the tokens.
Risks
While the standard itself is secure, the ecosystem around it carries risks. The most common danger is the prevalence of scam tokens. Because it is cheap and easy to create an ERC-20 token, bad actors often create fake versions of popular projects to trick users.
Another risk involves smart contract vulnerabilities. If the code behind a specific token is poorly written, hackers might find a way to drain the supply or freeze user funds. Always do your own research and check the official contract address before buying.
Getting started
To start using ERC-20 tokens, you simply need an Ethereum-compatible wallet like MetaMask or a hardware wallet. You will also need a small amount of ETH in your wallet to pay for 'gas fees,' which are the transaction costs required to process your moves on the network.
When sending tokens, always double-check the recipient address. Unlike a bank transfer, blockchain transactions are irreversible. If you send tokens to the wrong address, they are usually lost forever.
Common questions
Are ERC-20 tokens the same as Ethereum (ETH)?
No. ETH is the native currency of the Ethereum blockchain, while ERC-20 tokens are assets built on top of that blockchain.
Do I need ETH to send ERC-20 tokens?
Yes. Since ERC-20 tokens live on the Ethereum network, you must pay transaction fees (gas) in ETH to move them.
Can I store ERC-20 tokens in a Bitcoin wallet?
No. You must use a wallet that supports the Ethereum network to store and manage your ERC-20 tokens.
How do I know if a token is a scam?
Check the official project website for the correct contract address. Avoid tokens that have no liquidity or are being promoted through suspicious social media accounts.
What is the difference between ERC-20 and ERC-721?
ERC-20 tokens are fungible, meaning each unit is identical to another. ERC-721 tokens are non-fungible (NFTs), meaning each one is unique.
Educational content from Crypto and Stocks News — not financial, legal or tax advice.