ERC-20, short for Ethereum Request for Comment 20, is a technical standard used for creating and issuing fungible tokens on the Ethereum blockchain. It specifies a common set of rules that all tokens adhere to, ensuring they can interact seamlessly with each other, decentralised applications (dApps), and wallets within the Ethereum ecosystem.
How it works
The ERC-20 standard outlines six mandatory functions and three optional ones that any compliant token must implement. These functions include methods for transferring tokens between addresses (transfer), checking a user's token balance (balanceOf), and allowing other smart contracts to spend tokens on behalf of a user (approve and transferFrom). By defining these standard interfaces, any wallet or dApp built to interact with one ERC-20 token can automatically interact with all other ERC-20 tokens.
Essentially, ERC-20 acts like a blueprint for tokens. When a developer wants to create a new digital asset on Ethereum, instead of building everything from scratch, they can simply follow the ERC-20 standard. This significantly reduces development time and complexity, while also guaranteeing interoperability. The standard is maintained and updated by the Ethereum community, ensuring its continued relevance and security. This standardisation is why most stablecoins (like USDT or USDC) and the vast majority of tokens used in decentralised finance (DeFi) are built as ERC-20 tokens.
Why it matters for Australian investors
For Australian crypto investors, understanding ERC-20 is fundamental because it underpins a significant portion of the digital assets you'll encounter. Most of the popular altcoins, stablecoins, and DeFi tokens traded on Australian crypto exchanges are ERC-20 compliant. This standardisation means that transferring these tokens between wallets or using them in DeFi protocols is generally straightforward, assuming you're aware of the associated gas fees for Ethereum network transactions. Knowing a token is ERC-20 also provides a level of assurance regarding its interoperability within the broader Ethereum ecosystem, which is crucial for participating in decentralised finance or interacting with various dApps.
Common questions
Q: Is every token on the Ethereum blockchain an ERC-20 token?
A: No, not every token on the Ethereum blockchain is an ERC-20 token. WhileERC-20 is the most prevalent standard for fungible tokens, other standards exist for different purposes, such as ERC-721 for non-fungible tokens (NFTs) and ERC-1155 for multi-token standards handling both fungible and non-fungible assets.
Q: What is a "gas fee" in relation to ERC-20 tokens?
A: A "gas fee" is the transaction fee required to perform any operation on the Ethereum network, including sending or interacting with ERC-20 tokens. These fees are paid in Ether (ETH) to the network's validators to process and secure the transaction. The amount of gas required can fluctuate based on network congestion and the complexity of the operation.
Q: Can ERC-20 tokens be sent to any Ethereum address?
A: Yes, ERC-20 tokens can generally be sent to any valid Ethereum address. However, it's crucial to ensure that the receiving wallet or exchange supports the specific ERC-20 token you are sending. Attempting to send an ERC-20 token to a wallet that doesn't support it, or to an address on a different blockchain, could result in the permanent loss of your tokens.