Hedera
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  • Getting Started
    • Environment Setup
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      • Transfer HBAR
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    • EVM Developers
      • Deploy a Contract
  • Tutorials
    • Smart Contracts
      • How to Mint & Burn an ERC-721 Token Using Hardhat and Ethers (Part 1)
      • How to Set Access Control, a Token URI, Pause, and Transfer an ERC-721 Token Using Hardhat (Part 2)
      • How to Upgrade an ERC-721 Token with OpenZeppelin UUPS Proxies and Hardhat (Part 3)
      • How to Verify a Smart Contract on HashScan
      • Deploy a Smart Contract Using Remix
      • Deploy a Smart Contract Using Hardhat and Hiero JSON-RPC Relay
      • Deploy Your First Smart Contract
      • Deploy a Contract Using the Hedera Token Service
      • Send and Receive HBAR Using Solidity Smart Contracts
      • Deploy By Leveraging Ethereum Developer Tools On Hedera
      • Deploy a Subgraph Using The Graph and Hedera JSON-RPC Relay
      • Deploy Smart Contracts on Hedera Using Truffle
      • The Power of Native Hedera Tokens as ERC-20 Tokens: A step-by-step guide
      • HTS x EVM - Part 1: How to Mint NFTs
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      • HTS x EVM - Part 3: How to Pause, Freeze, Wipe, and Delete NFTs
      • Hedera Smart Contracts Workshop
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        • Outro
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        • How to Fork Testnet on Latest Block
    • Consensus
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    • Tokens
      • Create and Transfer Your First NFT
      • Create and Transfer Your First Fungible Token
      • Create and Transfer an NFT using a Solidity Contract
      • Structure Your Token Metadata Using JSON Schema V2
      • Hedera Token Service - Part 1: How to Mint NFTs
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      • Hedera Token Service - Part 3: How to Pause, Freeze, Wipe, and Delete NFTs
      • Create Your First Frictionless Airdrop Campaign
    • Local Node
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      • How to Create a Personal Access Token (API Key) on the Hedera Portal
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      • Understanding Hedera's EVM Differences and Compatibility
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      • Creating Smart Contracts
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INTRODUCTION

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RESOURCES

  • Status
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On this page
  • Supported Functions
  • Additional References

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  1. Core Concepts
  2. Smart Contracts
  3. Tokens Managed by Smart Contracts

ERC-20 (Fungible Tokens)

PreviousTokens Managed by Smart ContractsNextERC-721 (Non-Fungible Token)

Last updated 6 months ago

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The standard defines a set of functions and events that a token contract on the Ethereum blockchain should implement. ERC-20 tokens are fungible, meaning each token is identical and can be exchanged one-to-one.

Note: ERC-20 Token addresses refer to full Hedera Token Service (HTS) fungible token entities. These tokens can be fully managed by HTS API calls. Additionally, by utilizing interfaces or system contract functions, these tokens can also be managed by smart contracts on Hedera.

Supported Functions

From Interface ERC-20

name
function name() public view returns (string)

Returns the name of the token.

symbol
function symbol() public view returns (string)

Returns the symbol of the token.

decimals
function decimals() public view returns (uint8)

Returns the number of decimals the token uses.

totalSupply
function totalSupply() external view returns (uint256)

Returns the total supply of the token.

balanceOf
function balanceOf(address account) external view returns (uint256)

Returns of the balance of the token in the specified account. The account is the Hedera account ID 0.0.x in Solidity address format or the evm address of a contract that has been created via the CREATE2 operation.

allowance
function allowance(address owner, address spender) external view returns (uint256)

Returns the remaining number of tokens that spender will be allowed to spend on behalf of owner through transferFrom. This is zero by default. This value changes when approve or transferFrom are called. This works by loading the owner FUNGIBLE_TOKEN_ALLOWANCES from the accounts ledger and returning the allowance approved for spender The owner and spender address are the account IDs (0.0.num) in solidity format.

transfer
function transfer(address recipient, uint256 amount) external returns (bool)

Transfer tokens from your account to a recipient account. The recipient is the Hedera account ID 0.0.x in Solidity format or the EVM address of a contract that has been created via CREATE2 operation.

transferFrom
function transferFrom(address sender, address recipient, uint256 amount) external returns (bool)

Moves amount tokens from from to to using the allowance mechanism. amount is then deducted from the caller's allowance.

This works by creating a synthetic CryptoTransferTransaction with fungible token transfers with the is_approval property set to true.

approve
function approve(address spender, uint256 amount) external returns (bool)

Sets amount as the allowance of spender over the caller's tokens.

This works by creating a synthetic CryptoApproveAllowanceTransaction with payer - the account that called the precompile (the message sender property of the message frame in the EVM).

Fires an approval event with the following signature when executed: event Approval(address indexed owner, address indexed spender, uint256 value);


Additional References

ERC-20
IERC20
HIP-376
HIP-218
EIP-20