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TRC20 Standard — TRON Token Development Guide

Complete guide to the TRC20 token standard on TRON. Learn the technical specification, required functions, and how to develop and deploy TRC20 tokens.

Updated: June 2024 ~10 min read Token Standard · Solidity · Development

🪙 TRC20 at a Glance

TypeFungible token standard

Based OnERC20 (Ethereum)

ImplementationSmart contract (Solidity)

Key TokensUSDT, USDC, BTT

DecimalsConfigurable (6 for USDT)

EventsTransfer, Approval

🪙What is the TRC20 Standard?

TRC20 is a technical standard for fungible tokens on the TRON blockchain. It defines a set of rules and functions that all TRC20 tokens must implement to ensure compatibility with wallets, exchanges, and decentralized applications (dApps).

TRC20 is similar to Ethereum's ERC20 standard — both define interfaces for token contracts. However, TRC20 is optimized for TRON's architecture and uses the TRON Virtual Machine (TVM) for execution.

💡 TRC20 vs ERC20

TRC20 is not a direct copy of ERC20. While the function signatures are similar, TRC20 uses TRON's specific features like Energy (instead of gas) and has different event structures. Most Solidity ERC20 contracts can be deployed on TRON with minimal modifications.

⚖️TRC20 vs TRC10

TRON has two token standards: TRC10 and TRC20. Here's how they compare:

Feature	TRC20	TRC10
Implementation	Smart contract (Solidity)	Native (built into protocol)
Flexibility	High — custom logic	Limited
Approvals	✅ Supported	❌ Not supported
Events	✅ Transfer, Approval	❌ Limited
Interoperability	High (wallets, dApps)	Medium
Examples	USDT TRC20, USDC TRC20	BTT (old), WIN

💡 Which One to Use?

For most modern token projects, TRC20 is the recommended standard. It offers more features, better compatibility, and is the standard used by major tokens like USDT TRC20.

📋TRC20 Technical Specification

A TRC20 token contract must implement the following functions and events:

Function/Event	Description	Return Type
totalSupply()	Returns the total token supply	uint256
balanceOf(address)	Returns token balance of an address	uint256
transfer(address to, uint256 amount)	Sends tokens to another address	bool
approve(address spender, uint256 amount)	Allows spender to withdraw tokens	bool
transferFrom(address from, address to, uint256 amount)	Transfers tokens on behalf of another	bool
allowance(address owner, address spender)	Returns remaining allowance	uint256
Transfer event	Emitted when tokens are transferred	—
Approval event	Emitted when allowance is set	—

🔧 Optional Extensions

TRC20 tokens can also implement optional extensions like name(), symbol(), and decimals() for better user experience. These are not required but highly recommended.

📝TRC20 Contract Example

Here's a minimal TRC20 token contract in Solidity:

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

contract MyTRC20 {
  // State variables
  string public name = "MyToken";
  string public symbol = "MTK";
  uint8 public decimals = 18;
  uint256 public totalSupply;
  mapping(address => uint256) public balanceOf;
  mapping(address => mapping(address => uint256)) public allowance;

  // Transfer event
  event Transfer(address indexed from, address indexed to, uint256 value);
  event Approval(address indexed owner, address indexed spender, uint256 value);

  // Constructor
  constructor(uint256 initialSupply) {
    totalSupply = initialSupply;
    balanceOf[msg.sender] = initialSupply;
  }

  // Transfer function
  function transfer(address to, uint256 amount) public returns (bool) {
    require(to != address(0), "Invalid address");
    require(balanceOf[msg.sender] >= amount, "Insufficient balance");
    balanceOf[msg.sender] -= amount;
    balanceOf[to] += amount;
    emit Transfer(msg.sender, to, amount);
    return true;
  }
}

💡 Key Points

This example includes the minimum required functions. A production contract should include approve(), transferFrom(), and allowance() for full TRC20 compliance, plus security checks and modifier patterns.

📊TRC20 Events

Events are crucial for TRC20 tokens as they allow off-chain applications (like wallets and explorers) to track token activity:

Transfer event: event Transfer(address indexed from, address indexed to, uint256 value) — emitted when tokens are transferred.
Approval event: event Approval(address indexed owner, address indexed spender, uint256 value) — emitted when an approval is set or changed.
Why events matter: Wallets use Transfer events to update balances. Explorers like TronScan use them to display token history.
Indexed parameters: Use indexed for parameters you want to filter by (like sender, receiver, owner).

💡 Event Logging

Events are not accessible from smart contracts. They are only for off-chain applications. This keeps gas costs low while still providing visibility.

💵USDT TRC20 — The Most Popular TRC20 Token

USDT TRC20 is the most widely used TRC20 token. Here are its key details:

Contract address: TR7NHqjeKQxGTCi8q8ZY4pL8otSzgjLj6t
Decimals: 6 (1 USDT = 1,000,000 units)
Symbol: USDT
Name: Tether USD
Why it's popular: Low fees (on TRON), fast transfers, and wide exchange support.

💡 Verifying USDT TRC20

Always verify the USDT TRC20 contract address on TronScan or the official Tether website before interacting with it. Scammers create fake tokens with similar names.

🚀Developing a TRC20 Token

Steps to create and deploy your own TRC20 token:

1
Write the contract
Use Solidity to write your TRC20 contract. Include all required functions and events. You can use OpenZeppelin's TRC20 implementation as a starting point.
2
Compile and test
Compile your contract using Hardhat, Truffle, or Remix. Test on TRON's Shasta testnet to ensure everything works correctly.
3
Deploy to mainnet
Deploy your contract to the TRON mainnet using TronWeb, TronLink, or Remix with TRON plugin. You'll need TRX to pay deployment fees.
4
Verify on TronScan
Verify your contract source code on TronScan so users can see and interact with your token.
5
Add to wallets
Users can add your token to wallets like TronLink and Trust Wallet using your contract address.

⚠️ Security First

TRC20 tokens can hold significant value. Audit your contract before deployment. Use established patterns like OpenZeppelin's SafeERC20. Consider a professional security audit for production tokens.

📋Common TRC20 Tokens

Token	Contract Address	Decimals	Purpose
USDT	TR7NHqjeKQxGTCi8q8ZY4pL8otSzgjLj6t	6	Stablecoin
USDC	TEkxiTehnzSmSe2XqrBj4w32RUN966rdz8	6	Stablecoin
BTT	TAFjULxiVgT4qWk6UZwjqwZXTSaGaqnVp4	18	BitTorrent
JST	TCFLL5dx5ZJdKnWuesXxi1VPwjLVmWZZy9	18	JustStable
SUN	TSSMHYeV2uE9qYH95DqyoCuNCzEL1NvU3S	18	Sun Token

💡 Verify Contracts

Always verify contract addresses on TronScan before interacting. Scammers create fake tokens with similar names and addresses.

❓Frequently Asked Questions

What is the TRC20 standard?

TRC20 is a technical standard for fungible tokens on the TRON blockchain. It defines a set of functions that all TRC20 tokens must implement to ensure compatibility with wallets, exchanges, and dApps. It's similar to Ethereum's ERC20 standard.

What is the difference between TRC10 and TRC20?

TRC10 is TRON's native token standard that does not require smart contracts. It's simpler but less flexible. TRC20 is a smart contract-based standard with more features, including approvals, allowances, and event logs. TRC20 is the standard used by USDT TRC20 and most modern tokens.

What is the USDT TRC20 contract address?

The official USDT TRC20 contract address is TR7NHqjeKQxGTCi8q8ZY4pL8otSzgjLj6t. Always verify this on TronScan or the official Tether website before interacting with it.

Can I create my own TRC20 token?

Yes. You can create a TRC20 token by writing a Solidity smart contract that implements the TRC20 interface, testing it on Shasta testnet, and deploying it to the TRON mainnet. Many token creation tools and templates are available.

What are TRC20 events used for?

TRC20 events (Transfer and Approval) are used by off-chain applications like wallets and block explorers to track token activity. They allow wallets to update balances and TronScan to display token transaction history without reading the entire contract state.

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