Sui Framework

The Sui Framework provides core modules for building Move applications on Sui. These modules are published at address 0x2 and provide fundamental functionality.

Core Modules

object.move

Defines Sui’s object model and provides functions for object operations. Key Types:

UID - Unique identifier for objects
ID - Reference to an object’s UID

Key Functions:

// Create new UID
public fun new(ctx: &mut TxContext): UID

// Delete UID (consumes the object)
public fun delete(id: UID)

// Get object ID
public fun uid_to_inner(uid: &UID): ID

// Get object address
public fun uid_to_address(uid: &UID): address

// Borrow UID mutably
public fun borrow_id<T: key>(obj: &T): &ID

Example:

use sui::object::{Self, UID};
use sui::tx_context::TxContext;

struct MyObject has key {
    id: UID,
    value: u64,
}

public fun create(ctx: &mut TxContext): MyObject {
    MyObject {
        id: object::new(ctx),
        value: 0,
    }
}

coin.move

Defines the Coin type and provides functions for working with fungible tokens. Key Types:

Coin<T> - A coin of type T
TreasuryCap<T> - Capability to mint/burn coins
CoinMetadata<T> - Metadata for a coin type

Key Functions:

// Get coin value
public fun value<T>(coin: &Coin<T>): u64

// Split coin
public fun split<T>(coin: &mut Coin<T>, amount: u64, ctx: &mut TxContext): Coin<T>

// Join coins
public fun join<T>(coin: &mut Coin<T>, other: Coin<T>)

// Take from coin
public fun take<T>(balance: &mut Balance<T>, value: u64, ctx: &mut TxContext): Coin<T>

// Put coin into balance
public fun put<T>(balance: &mut Balance<T>, coin: Coin<T>)

// Mint new coins (requires TreasuryCap)
public fun mint<T>(cap: &mut TreasuryCap<T>, value: u64, ctx: &mut TxContext): Coin<T>

// Burn coins (requires TreasuryCap)
public fun burn<T>(cap: &mut TreasuryCap<T>, coin: Coin<T>): u64

Example:

use sui::coin::{Self, Coin};
use sui::sui::SUI;

public fun split_and_transfer(
    coin: &mut Coin<SUI>,
    amount: u64,
    recipient: address,
    ctx: &mut TxContext
) {
    let split_coin = coin::split(coin, amount, ctx);
    transfer::public_transfer(split_coin, recipient);
}

transfer.move

Provides functions for transferring objects between addresses. Key Functions:

// Transfer object with public transfer
public fun public_transfer<T: key + store>(obj: T, recipient: address)

// Transfer object (requires custom transfer policy)
public fun transfer<T: key>(obj: T, recipient: address)

// Share object (make it shared)
public fun public_share_object<T: key>(obj: T)

// Share object with initial version tracking
public fun share_object<T: key>(obj: T)

// Freeze object (make it immutable)
public fun public_freeze_object<T: key>(obj: T)

// Freeze object
public fun freeze_object<T: key>(obj: T)

Example:

use sui::transfer;

public fun create_and_transfer(recipient: address, ctx: &mut TxContext) {
    let obj = MyObject {
        id: object::new(ctx),
        value: 100,
    };
    transfer::transfer(obj, recipient);
}

public fun create_shared(ctx: &mut TxContext) {
    let shared_obj = SharedObject {
        id: object::new(ctx),
        counter: 0,
    };
    transfer::share_object(shared_obj);
}

tx_context.move

Provides transaction context information. Key Functions:

// Get transaction sender
public fun sender(ctx: &TxContext): address

// Get transaction digest
public fun digest(ctx: &TxContext): &vector<u8>

// Get current epoch
public fun epoch(ctx: &TxContext): u64

// Get epoch timestamp (milliseconds)
public fun epoch_timestamp_ms(ctx: &TxContext): u64

// Derive fresh ID (for creating objects)
public(package) fun fresh_object_address(ctx: &mut TxContext): address

balance.move

Defines the Balance type for managing fungible token amounts. Key Types:

Balance<T> - A balance of type T (not an object)

Key Functions:

// Get balance value
public fun value<T>(balance: &Balance<T>): u64

// Create zero balance
public fun zero<T>(): Balance<T>

// Split balance
public fun split<T>(balance: &mut Balance<T>, value: u64): Balance<T>

// Join balances
public fun join<T>(balance: &mut Balance<T>, other: Balance<T>)

// Destroy zero balance
public fun destroy_zero<T>(balance: Balance<T>)

event.move

Provides functions for emitting on-chain events. Key Functions:

// Emit event
public fun emit<T: copy + drop>(event: T)

Example:

use sui::event;

struct ItemPurchased has copy, drop {
    item_id: ID,
    buyer: address,
    price: u64,
}

public fun purchase(item: Item, payment: Coin<SUI>, ctx: &TxContext) {
    // ... purchase logic ...
    
    event::emit(ItemPurchased {
        item_id: object::id(&item),
        buyer: tx_context::sender(ctx),
        price: coin::value(&payment),
    });
}

table.move

Provides a key-value store (dynamic fields that are objects). Key Types:

Table<K, V> - A table with key type K and value type V

Key Functions:

// Create new table
public fun new<K: copy + drop + store, V: store>(ctx: &mut TxContext): Table<K, V>

// Add entry
public fun add<K: copy + drop + store, V: store>(table: &mut Table<K, V>, key: K, value: V)

// Borrow entry
public fun borrow<K: copy + drop + store, V: store>(table: &Table<K, V>, key: K): &V

// Borrow mutable
public fun borrow_mut<K: copy + drop + store, V: store>(table: &mut Table<K, V>, key: K): &mut V

// Remove entry
public fun remove<K: copy + drop + store, V: store>(table: &mut Table<K, V>, key: K): V

// Check if contains
public fun contains<K: copy + drop + store, V: store>(table: &Table<K, V>, key: K): bool

// Destroy empty table
public fun destroy_empty<K: copy + drop + store, V: store>(table: Table<K, V>)

Example:

use sui::table::{Self, Table};

struct Registry has key {
    id: UID,
    names: Table<address, vector<u8>>,
}

public fun register(registry: &mut Registry, name: vector<u8>, ctx: &TxContext) {
    table::add(&mut registry.names, tx_context::sender(ctx), name);
}

dynamic_field.move

Provides dynamic fields (fields added at runtime). Key Functions:

// Add dynamic field
public fun add<Name: copy + drop + store, Value: store>(
    object: &mut UID,
    name: Name,
    value: Value
)

// Borrow dynamic field
public fun borrow<Name: copy + drop + store, Value: store>(
    object: &UID,
    name: Name
): &Value

// Borrow mutable
public fun borrow_mut<Name: copy + drop + store, Value: store>(
    object: &mut UID,
    name: Name
): &mut Value

// Remove dynamic field
public fun remove<Name: copy + drop + store, Value: store>(
    object: &mut UID,
    name: Name
): Value

// Check if exists
public fun exists_<Name: copy + drop + store>(
    object: &UID,
    name: Name
): bool

bag.move

Provides a heterogeneous collection (like Table but can store different value types). Key Types:

Bag - A heterogeneous map

Key Functions:

// Create new bag
public fun new(ctx: &mut TxContext): Bag

// Add entry
public fun add<K: copy + drop + store, V: store>(bag: &mut Bag, key: K, value: V)

// Borrow entry
public fun borrow<K: copy + drop + store, V: store>(bag: &Bag, key: K): &V

// Remove entry
public fun remove<K: copy + drop + store, V: store>(bag: &mut Bag, key: K): V

clock.move

Provides access to on-chain time. Key Functions:

// Get current timestamp in milliseconds
public fun timestamp_ms(clock: &Clock): u64

Example:

use sui::clock::{Self, Clock};

public fun check_deadline(clock: &Clock, deadline: u64) {
    assert!(clock::timestamp_ms(clock) <= deadline, EDeadlinePassed);
}

package.move

Provides package publishing capabilities. Key Types:

Publisher - Capability proving package authorship
UpgradeCap - Capability to upgrade a package

Key Functions:

// Claim publisher object (call in module initializer)
public fun claim<OTW: drop>(otw: OTW, ctx: &mut TxContext): Publisher

// Check if address published the package
public fun from_package<T>(publisher: &Publisher): bool

Common Patterns

Creating Custom Coins

module my_coin::usdc {
    use sui::coin;
    
    struct USDC has drop {}
    
    fun init(witness: USDC, ctx: &mut TxContext) {
        let (treasury, metadata) = coin::create_currency(
            witness,
            6, // decimals
            b"USDC",
            b"USD Coin",
            b"Stablecoin pegged to USD",
            option::none(),
            ctx
        );
        transfer::public_freeze_object(metadata);
        transfer::public_transfer(treasury, tx_context::sender(ctx));
    }
}

Using Display

use sui::display;
use sui::package;

fun init(otw: OTW, ctx: &mut TxContext) {
    let publisher = package::claim(otw, ctx);
    let display = display::new<MyNFT>(&publisher, ctx);
    
    display::add(&mut display, string::utf8(b"name"), string::utf8(b"{name}"));
    display::add(&mut display, string::utf8(b"image_url"), string::utf8(b"{image_url}"));
    
    display::update_version(&mut display);
    
    transfer::public_transfer(publisher, tx_context::sender(ctx));
    transfer::public_transfer(display, tx_context::sender(ctx));
}

Full Module List

The Sui Framework at 0x2 includes:

object - Object model
coin - Fungible tokens
balance - Token balances
transfer - Object transfers
tx_context - Transaction context
event - Event emission
table - Key-value store
bag - Heterogeneous map
object_table - Table with object values
object_bag - Bag with object values
dynamic_field - Dynamic fields
dynamic_object_field - Dynamic object fields
vec_map - Vector-based map
vec_set - Vector-based set
linked_table - Linked list table
table_vec - Vector-like table
priority_queue - Priority queue
display - Object display metadata
package - Package publishing
clock - On-chain time
bcs - Binary serialization
address - Address utilities
hex - Hex encoding
math - Math utilities
sui - SUI coin module
token - Token standard (new)
random - Randomness API
crypto - Cryptographic primitives
authenticator_state - zkLogin state
deny_list - Address deny listing
kiosk - Kiosk trading protocol

JSON-RPC API

Rust SDK

GraphQL API

Framework

Sui Framework

Core Modules

object.move

coin.move

transfer.move

tx_context.move

balance.move

event.move

table.move

dynamic_field.move

bag.move

clock.move

package.move

Common Patterns

Creating Custom Coins

Using Display

Full Module List

Build docs developers (and LLMs) love

JSON-RPC API

Rust SDK

GraphQL API

Framework

​Core Modules

​object.move

​coin.move

​transfer.move

​tx_context.move

​balance.move

​event.move

​table.move

​dynamic_field.move

​bag.move

​clock.move

​package.move

​Common Patterns

​Creating Custom Coins

​Using Display

​Full Module List

Build docs developers (and LLMs) love

Core Modules

object.move

coin.move

transfer.move

tx_context.move

balance.move

event.move

table.move

dynamic_field.move

bag.move

clock.move

package.move

Common Patterns

Creating Custom Coins

Using Display

Full Module List