Fungible Tokens

Fungible Token Standard

In Alephium, new tokens can be issued when deploying new contracts. The id of the newly issued token is the same as the id of the contract that issues it.

Tokens are usually associated with information such as name, decimals, totalSupply, etc. The goal of the token standard is to put constraints on token-issuing contract so it becomes easier for dApps and wallets to infer token types and fetch token information.

The standard fungible token interface defines methods to get the name, symbol, decimals as well as the totalSupply of the token. It is also annotated with the @std annotation with the id #0001:

// Standard interface for fungible tokens
@std(id = #0001)
@using(methodSelector = false)
Interface IFungibleToken {
  pub fn getSymbol() -> ByteVec
  pub fn getName() -> ByteVec
  pub fn getDecimals() -> U256
  pub fn getTotalSupply() -> U256
}

Token List

Other than the basic information such as name, symbol and decimals, etc. Fungible tokens usually contain other metadata such as description and logoURI so that dApps and wallets can properly display them.

The goal of the token list is to serve as a platform for token issuers to submit token metadata for proper display in wallets, explorers, and other ecosystem interfaces. Here is how extension wallet displays a token before and after it is added into the token list.

    

Currently, a pull request is needed to add the token metadata to token list.

caution

The token list serves as a platform for token issuers to submit token metadata for proper display in wallets, explorers, and other ecosystem interfaces. Entries are verified solely against required metadata formats. No due diligence or verification is performed on token issuers or associated projects. It is imperative to conduct your own research before engaging with any token. Inclusion on this list does not imply an endorsement, audit or any form of verification from Alephium's core contributors.

Wallet Support

Official wallets and explorer have native support for fungible tokens.

Following is an example of displaying and transfering the PACA token using extesion wallet: