Sui Move Coin Protocol: A Comprehensive Guide to ERC20-like Tokens

Introduction to Coin & ERC20 in Sui Move

Many developers familiar with other smart contract languages or Ethereum often ask: "How does Sui Move implement ERC20-like functionality? Is it simple?" This section explores Sui Move's equivalent to Ethereum's ERC20 standard.

Understanding ERC20 Fundamentals

ERC-20 represents a standardized token protocol on the Ethereum network, where:

• ERC stands for "Ethereum Request for Comment"
• It provides a framework for creating interoperable tokens efficiently
• Enables seamless integration across different projects

👉 Discover more about token standards

Sui Move Coin: Key Innovations

While influenced by ERC20, Sui Move introduces significant innovations through:

1. Native asset-oriented programming model
2. Unique object-based architecture
3. Simplified usage patterns
4. Enhanced generic functionality

The Sui Move Coin protocol offers greater flexibility while maintaining compatibility with familiar token concepts.

Creating Your First Sui Move Coin

Let's examine a basic implementation:

module examples::mycoin {
    use std::option;
    use sui::coin;
    use sui::transfer;
    use sui::tx_context::{Self, TxContext};
    
    public struct MYCOIN has drop {}
    
    fun init(witness: MYCOIN, ctx: &mut TxContext) {
        let (treasury, metadata) = coin::create_currency(
            witness, 
            6, 
            b"MYCOIN", 
            b"", 
            b"", 
            option::none(), 
            ctx
        );
        transfer::public_freeze_object(metadata);
        transfer::public_transfer(treasury, tx_context::sender(ctx))
    }
}

Key components:

• create_currency establishes the token properties
• Metadata becomes immutable through freezing
• Treasury cap controls minting/burning capabilities

Core Protocol Components

The Coin Module Structure

module sui::coin {
    struct Coin has key, store {
        id: UID,
        balance: Balance
    }
    
    public struct CoinMetadata has key, store {
        id: UID,
        decimals: u8,
        name: string::String,
        symbol: ascii::String,
        description: string::String,
        icon_url: Option<String>
    }
    
    public struct TreasuryCap has key, store {
        id: UID,
        total_supply: Supply
    }
    
    public fun create_currency(
        witness: T,
        decimals: u8,
        symbol: vector<u8>,
        name: vector<u8>,
        description: vector<u8>,
        icon_url: Option<String>,
        ctx: &mut TxContext
    ): (TreasuryCap, CoinMetadata) {
        // Implementation details
    }
}

Balance Management

module sui::balance {
    public struct Supply has store {
        value: u64
    }
    
    public struct Balance has store {
        value: u64
    }
    
    public fun create_supply(_: T): Supply {
        Supply { value: 0 }
    }
    
    public fun increase_supply(self: &mut Supply, value: u64): Balance {
        Balance { value }
    }
}

👉 Explore advanced token economics

Advanced Token Management

Single-Address Controlled Coin

Initialization:

fun init(witness: MYCOIN, ctx: &mut TxContext) {
    let (treasury, metadata) = coin::create_currency(...);
    transfer::public_transfer(treasury, tx_context::sender(ctx))
}

Minting Function:

public entry fun mint(
    treasury_cap: &mut TreasuryCap,
    amount: u64,
    recipient: address,
    ctx: &mut TxContext
) {
    let coin = coin::mint(treasury_cap, amount, ctx);
    transfer::public_transfer(coin, recipient)
}

Burning Mechanism:

public entry fun burn(cap: &mut TreasuryCap, c: Coin): u64 {
    let Coin { id, balance } = c;
    object::delete(id);
    balance::decrease_supply(&mut cap.total_supply, balance)
}

Faucet Coin Implementation

fun init(witness: MYCOIN, ctx: &mut TxContext) {
    let (treasury, metadata) = coin::create_currency(...);
    transfer::public_share_object(treasury)
}

Token Economics Control

Supply Limitation Example

const TOTAL_SUPPLY_MIST: u64 = 10_000_000_000_000_000_000;

fun new(ctx: &mut TxContext): Balance {
    let total_sui = balance::increase_supply(&mut supply, TOTAL_SUPPLY_MIST);
    balance::destroy_supply(supply);
    total_sui
}

Vesting Mechanism Implementation

Common patterns include:

1. Converting Coin to Balance for storage
2. Locking Supply within smart contracts
3. Implementing time-based release schedules

FAQ Section

What makes Sui Move Coin different from ERC20?

Sui Move Coin integrates natively with Sui's object model, offering better security and simpler development patterns while maintaining similar functionality.

How do I control token minting?

The TreasuryCap object controls minting rights. Transfer it to a designated address during initialization for controlled minting.

Can I implement custom token economics?

Yes, Sui Move's flexible architecture allows for complex token models including vesting, supply caps, and dynamic minting rules.

Is metadata mandatory for Sui Move Coins?

While technically optional, including complete metadata (name, symbol, decimals) ensures proper interoperability and display in wallets.

How do I handle token upgrades?

Sui's object model allows for flexible upgrade patterns, though careful design is needed to maintain backward compatibility.

👉 Learn more about token design best practices