The ERC-20 Standard

ERC-20 is the standard interface for fungible tokens on Ethereum. Fungible means every unit is identical and interchangeable, like currency.

Because all ERC-20 tokens share the same interface, wallets and exchanges can support any of them automatically.

An ERC-20 token must implement six functions:

• totalSupply()
• balanceOf(account)
• transfer(to, amount)
• approve(spender, amount)
• allowance(owner, spender)
• transferFrom(from, to, amount)