Overview ​

Introduction ​

FA2 is the Tezos standard for a unified token contract interface.

It caters to a diverse range of token types and implementations, including but not limited to fungible tokens and NFTs.

The standards relevant for FA2 are TZIP-12 and TZIP-16. They are functionality equivalent to Ethereum's ERC-20, ERC-721, and ERC-1155.

Library ​

SmartPy provides a modular FA2 library that can be configured and adapted with custom logic to support a very wide range of needs.

import smartpy as sp
from templates import fa2_lib as fa2

Resources ​

Here are some key resources to help you navigate the FA2 library:

• Library template: view, download
• Library tests: NFT view, download; Fungible: view, download; Single asset: view, download

Token identification ​

A token is uniquely identified on the chain by:

• its contract address and
• a token id, which is a natural number (sp.nat).

If a contract supports only a single token, the token ID must be 0. Although the contract is responsible for managing and assigning token ids, the FA2 library simplifies this process by automatically incrementing token ids.