ESDT tokens

Introduction

ESDT stands for Elrond Standard Digital Token.

Custom tokens at native speed and scalability, without ERC20

The Elrond network natively supports the issuance of custom tokens, without the need for contracts such as ERC20, but addressing the same use-cases. And due to the native in-protocol support, transactions with custom tokens do not require the VM at all. In effect, this means that custom tokens are as fast and as scalable as the native EGLD token itself.

Users also do not need to worry about sharding when transacting custom tokens, because the protocol employs the same handling mechanisms for ESDT transactions across shards as the mechanisms used for the EGLD token. Sharding is therefore automatically handled and invisible to the user.

Technically, the balances of ESDT tokens held by an Account are stored directly under the data trie of that Account. It also implies that an Account can hold balances of any number of custom tokens, in addition to the native EGLD balance. The protocol guarantees that no Account can modify the storage of ESDT tokens, neither its own nor of other Accounts.

ESDT tokens can be issued, owned and held by any Account on the Elrond network, which means that both users and smart contracts have the same functionality available to them. Due to the design of ESDT tokens, smart contracts can manage tokens with ease, and they can even react to an ESDT transfer.

Issuance of fungible ESDT tokens

ESDT tokens are issued via a request to the Metachain, which is a transaction submitted by the Account which will manage the tokens. When issuing a token, one must provide a token name, a ticker, the initial supply, the number of decimals for display purpose and optionally additional properties. This transaction has the form:

IssuanceTransaction {
    Sender: <account address of the token manager>
    Receiver: erd1qqqqqqqqqqqqqqqpqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqzllls8a5w6u
    Value: 50000000000000000 # (0.05 EGLD)
    GasLimit: 60000000
    Data: "issue" +
          "@" + <token name in hexadecimal encoding> +
          "@" + <token ticker in hexadecimal encoding> +
          "@" + <initial supply in hexadecimal encoding> +
          "@" + <number of decimals in hexadecimal encoding>
}

Our initial proposal is the issuance cost to be 0.05 EGLD. Feedback and suggestions from the community is more than welcome.

Optionally, the properties can be set when issuing a token. Example:

IssuanceTransaction {
    Sender: <account address of the token manager>
    Receiver: erd1qqqqqqqqqqqqqqqpqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqzllls8a5w6u
    Value: 50000000000000000 # (0.05 EGLD)
    GasLimit: 60000000
    Data: "issue" +
          "@" + <token name in hexadecimal encoding> +
          "@" + <token ticker in hexadecimal encoding> +
          "@" + <initial supply in hexadecimal encoding> +
          "@" + <number of decimals in hexadecimal encoding> +
          "@" + <"canFreeze" hexadecimal encoded> + "@" + <"true" or "false" hexadecimal encoded> +
          "@" + <"canWipe" hexadecimal encoded> + "@" + <"true" or "false" hexadecimal encoded> +
          "@" + <"canPause" hexadecimal encoded> + "@" + <"true" or "false" hexadecimal encoded> +
          "@" + <"canMint" hexadecimal encoded> + "@" + <"true" or "false" hexadecimal encoded> +
          "@" + <"canBurn" hexadecimal encoded> + "@" + <"true" or "false" hexadecimal encoded> +
          "@" + <"canChangeOwner" hexadecimal encoded> + "@" + <"true" or "false" hexadecimal encoded> +
          "@" + <"canUpgrade" hexadecimal encoded> + "@" + <"true" or "false" hexadecimal encoded> +
          "@" + <"canAddSpecialRoles" hexadecimal encoded> + "@" + <"true" or "false" hexadecimal encoded>
}

The receiver address erd1qqqqqqqqqqqqqqqpqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqzllls8a5w6u is a built-in system smart contract (not a VM-executable contract), which only handles token issuance and other token management operations, and does not handle any transfers. The contract will add a random string to the ticker thus creating the token identifier. The random string starts with “-” and has 6 more random characters. For example, a token identifier could look like ALC-6258d2.

Parameters format

Token Name:

  • length between 3 and 20 characters
  • alphanumeric characters only

Token Ticker:

  • length between 3 and 10 characters
  • alphanumeric UPPERCASE only

Number of decimals:

  • should be a numerical value between 0 and 18
  • hexadecimal encoded

Numerical values, such as initial supply or number of decimals, should be the hexadecimal encoding of the decimal numbers representing them. Additionally, they should have an even number of characters. Examples:

  • 10 decimal => 0a hex encoded
  • 48 decimal => 30 hex encoded
  • 1000000 decimal => 0f4240 hex encoded

Number of decimals usage

Front-end applications will use the number of decimals in order to display balances. Therefore, you must adapt the supply according to the number of decimals parameter.

For example, if you would like to create a token ALC with a total supply of 100 and number of decimals = 2, then you should set the initial supply to 10000 (100∗102100 * 10^2). Also, when transferring/burning/minting tokens, you should keep in mind there is also the denomination involved.

Therefore, if you own some above-mentioned ALC tokens, and you want to transfer 7.5 ALC, then the value argument of the transaction should be 750 (7.5∗1027.5 * 10^2). The same rule applies to burning or minting.

tip

This is only relevant when performing operations via manual transactions over ESDT tokens. The Web Wallet for example already has this feature in place, so you don't have to take care of the number of decimals.

Issuance examples

For example, a user named Alice wants to issue 4091 tokens called "AliceTokens" with the ticker "ALC". Also, the number of decimals is 6.

As stated above, if the user wants 4091 tokens with 6 decimals, then the initial supply has to be 4091∗1064091 * 10^6 tokens so a total of 4091000000.

IssuanceTransaction {
    Sender: erd1sg4u62lzvgkeu4grnlwn7h2s92rqf8a64z48pl9c7us37ajv9u8qj9w8xg
    Receiver: erd1qqqqqqqqqqqqqqqpqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqzllls8a5w6u
    Value: 50000000000000000 # (0.05 EGLD)
    GasLimit: 60000000
    Data: "issue" +
          "@416c696365546f6b656e73" +  // "AliceTokens" hex encoded
          "@414c43" +                  // "ALC" hex encoded
          "@f3d7b4c0" +                // 4091000000 hex encoded
          "@06"                        // 6 hex encoded  
}

Once this transaction is processed by the Metachain, Alice becomes the designated manager of AliceTokens, and is granted a balance of 4091000000 AliceTokens with 6 decimals (resulting in 4091 tokens). She can increase the total supply of tokens at a later time if needed. For more operations available to ESDT token managers, see Token management.

If the issue transaction is successful, a smart contract result will mint the requested token and supply in the account used for issuance, which is also the token manager. In that smart contract result, the data field will contain a transfer syntax which is explained below. What is important to note is that the token identifier can be fetched from here in order to use it for transfers. Alternatively, the token identifier can be fetched from the API (explained also below).

Transfers

Performing an ESDT transfer is done by sending a transaction directly to the desired receiver Account, but specifying some extra pieces of information in its Data field. An ESDT transfer transaction has the following form:

TransferTransaction {
    Sender: <account address of the sender>
    Receiver: <account address of the receiver>
    Value: 0
    GasLimit: 500000
    Data: "ESDTTransfer" +
          "@" + <token identifier in hexadecimal encoding> +
          "@" + <value to transfer in hexadecimal encoding>
}

While this transaction may superficially resemble a smart contract call, it is not. The differences are the following:

  • the receiver can be any account (which may or may not be a smart contract)
  • the GasLimit must be set to the value required by the protocol for ESDT transfers, namely 500000
  • the Data field contains what appears to be a smart contract method invocation with arguments, but this invocation never reaches the VM: the string ESDTTransfer is reserved by the protocol and is handled as a built-in function, not as a smart contract call

Following the example from earlier, assuming that the token identifier is 414c432d363235386432, a transfer from Alice to another user, Bob, would look like this:

TransferTransaction {
    Sender: erd1sg4u62lzvgkeu4grnlwn7h2s92rqf8a64z48pl9c7us37ajv9u8qj9w8xg
    Receiver: erd1spyavw0956vq68xj8y4tenjpq2wd5a9p2c6j8gsz7ztyrnpxrruqzu66jx
    Value: 0
    GasLimit: 500000
    Data: "ESDTTransfer" +
          "@414c432d363235386432" +
          "@0c"
}

Using the transaction in the example above, Alice will transfer 12 AliceTokens to Bob.

Transfers to a smart contract

Smart contracts may hold ESDT tokens and perform any kind of transaction with them, just like any Account. However, there are a few extra ESDT features dedicated to smart contracts:

Payable versus non-payable contract: upon deployment, a smart contract may be marked as payable, which means that it can receive either EGLD or ESDT tokens without calling any of its methods (i.e. a simple transfer). But by default, all contracts are non-payable, which means that simple transfers of EGLD or ESDT tokens will be rejected, unless they are method calls.

ESDT transfer with method invocation: it is possible to send ESDT tokens to a contract as part of a method call, just like sending EGLD as part of a method call. A transaction that sends ESDT tokens to a contract while also calling one of its methods has the following form:

TransferWithCallTransaction {
    Sender: <account address of the sender>
    Receiver: <account address of the smart contract>
    Value: 0
    GasLimit: 500000 + <an appropriate amount for the method call>
    Data: "ESDTTransfer" +
          "@" + <token identifier in hexadecimal encoding> +
          "@" + <value to transfer in hexadecimal encoding> +
          "@" + <name of method to call in hexadecimal encoding> +
          "@" + <first argument of the method in hexadecimal encoding> +
          "@" + <second argument of the method in hexadecimal encoding> +
          <...>
}

Sending a transaction containing both an ESDT transfer and a method call allows non-payable smart contracts to receive tokens as part of the call, as if it were EGLD. The smart contract may use dedicated API functions to inspect the name of the received ESDT tokens and their amount, and react accordingly.

Multiple tokens transfer

There is also the possibility to perform multiple tokens transfers in a single bulk. This way, one can send (to a single receiver) multiple fungible, semi-fungible or non-fungible tokens via a single transaction.

A multi-token transfer transaction has the following form:

MultiTokensTransferTransaction {
    Sender: <account address of the sender>
    Receiver: <same as sender>
    Value: 0
    GasLimit: 1_100_000 * num tokens
    Data: "MultiESDTNFTTransfer" +
          "@" + <receiver bytes in hexadecimal encoding> +
          "@" + <number of tokens to transfer in hexadecimal encoding> +
          "@" + <token 0 identifier in hexadecimal encoding> +
          "@" + <token 0 nonce in hexadecimal encoding> +
          "@" + <token 0 quantity to transfer in hexadecimal encoding> +
          "@" + <token 1 identifier in hexadecimal encoding> +
          "@" + <token 1 nonce in hexadecimal encoding> +
          "@" + <token 1 quantity to transfer in hexadecimal encoding> +
          ...
}
tip

Each token requires the token identifier, the nonce and the quantity to transfer.

For fungible tokens (regular ESDT) the nonce has to be 0 (00 hex-encoded)

Example:

MultiTokensTransferTransaction {
    Sender: erd1sg4u62lzvgkeu4grnlwn7h2s92rqf8a64z48pl9c7us37ajv9u8qj9w8xg
    Receiver: erd1sg4u62lzvgkeu4grnlwn7h2s92rqf8a64z48pl9c7us37ajv9u8qj9w8xg
    Value: 0
    GasLimit: 2_200_000
    Data: "MultiESDTNFTTransfer" +
          "@8049d639e5a6980d1cd2392abcce41029cda74a1563523a202f09641cc2618f8" + // erd1spyavw0956vq68xj8y4tenjpq2wd5a9p2c6j8gsz7ztyrnpxrruqzu66jx
          "@02" +  // 2 tokens to transfer
          "@414c432d363235386432" +   // ALC-6258d2
          "@00" +  // 0 -> the nonce is 0 for regular ESDT tokens
          "@0c" +  // 12 -> value to transfer
          "@5346542d317134723869" +  // SFT-1q4r8i
          "@01" +  // 1 -> the nonce of the SFT
          "@03"   // 3 -> the quantity to transfer
}

Using the transaction in the example above, the receiver should be credited 12 ALC-6258d2 tokens and 3 SFT-1q4r8i tokens.

Transfers done programmatically

The Rust framework exposes several ways in which you can transfer ESDT tokens via SendApi. For example, in order to transfer amount of esdt_token_name to address, one would do the following:

self.send().direct_esdt(&address, &esdt_token_name, token_nonce: u64, &amount);

Token management

The Account which submitted the issuance request for a custom token automatically becomes the manager of the token (see Issuance of ESDT tokens). The manager of a token has the ability to manage the properties, the total supply and the availability of a token. Because smart contracts are Accounts as well, a smart contract can also issue and own ESDT tokens and perform management operations by sending the appropriate transactions, as shown below.

Configuration properties of an ESDT token

Every ESDT token has a set of properties which control what operations are possible with it. See Management operations below for the operations controlled by them. The properties are:

  • canMint - more units of this token can be minted by the token manager after initial issuance, increasing the supply
  • canBurn - users may "burn" some of their tokens, reducing the supply
  • canPause - the token manager may prevent all transactions of the token, apart from minting and burning
  • canFreeze - the token manager may freeze the token balance in a specific account, preventing transfers to and from that account
  • canWipe - the token manager may wipe out the tokens held by a frozen account, reducing the supply
  • canChangeOwner - token management can be transferred to a different account
  • canUpgrade - the token manager may change these properties
  • canAddSpecialRoles - the token manager can assign a specific role(s)

Management operations

The manager of an ESDT token has a number of operations at their disposal, which control how the token is used by other users. These operations can only be performed by the token manager - no other account may perform them. One special exception is the ESDTBurn operation, which is available to any Account which holds units of the token in cause.

Minting

tip

On Mainnet, starting with epoch 432, global mint is disabled so one has to use local mint instead.

The manager of an ESDT token can increase the total supply by sending to the Metachain a transaction of the following form:

MintTransaction {
    Sender: <account address of the token manager>
    Receiver: erd1qqqqqqqqqqqqqqqpqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqzllls8a5w6u
    Value: 0
    GasLimit: 60000000
    Data: "mint" +
          "@" + <token identifier in hexadecimal encoding> +
          "@" + <supply to mint in hexadecimal encoding>
}

Following this transaction, the total supply of tokens is increased by the new supply specified in the Data field, and the manager receives that amount of tokens into their balance.

This operation requires that the option canMint is set to true for the token.

Alternatively, an account with the ESDTRoleLocalMint role set can perform a local mint:

LocalMintTransaction {
    Sender: <account address of the token manager>
    Receiver: <same as sender>
    Value: 0
    GasLimit: 300000
    Data: "ESDTLocalMint" +
          "@" + <token identifier in hexadecimal encoding> +
          "@" + <supply to mint in hexadecimal encoding>
}

Burning

tip

On Mainnet, starting with epoch 432, global burn is disabled so one has to use local burn instead.

Anyone that holds an amount of ESDT tokens may burn it at their discretion, effectively losing them permanently. This operation reduces the total supply of tokens, and cannot be undone, unless the token manager mints more tokens. Burning is performed by sending a transaction to the Metachain, of the form:

BurnTransaction {
    Sender: <account address of a token holder>
    Receiver: erd1qqqqqqqqqqqqqqqpqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqzllls8a5w6u
    Value: 0
    GasLimit: 60000000
    Data: "ESDTBurn" +
          "@" + <token identifier in hexadecimal encoding> +
          "@" + <supply to burn in hexadecimal encoding>
}

Following this transaction, the token holder loses from the balance the amount of tokens specified by the Data.

This operation requires that the option canBurn is set to true for the token.

Alternatively, an account with the ESDTRoleLocalBurn role set can perform a local burn:

LocalBurnTransaction {
    Sender: <account address of the token manager>
    Receiver: <same as sender>
    Value: 0
    GasLimit: 300000
    Data: "ESDTLocalBurn" +
          "@" + <token identifier in hexadecimal encoding> +
          "@" + <supply to burn in hexadecimal encoding>
}

Pausing and Unpausing

The manager of an ESDT token may choose to suspend all transactions of the token, except minting, freezing/unfreezing and wiping. The transaction form is as follows:

PauseTransaction {
    Sender: <account address of the token manager>
    Receiver: erd1qqqqqqqqqqqqqqqpqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqzllls8a5w6u
    Value: 0
    GasLimit: 60000000
    Data: "pause" +
          "@" + <token identifier in hexadecimal encoding>
}

The reverse operation, unpausing, will allow transactions of the token again:

UnpauseTransaction {
    Sender: <account address of the token manager>
    Receiver: erd1qqqqqqqqqqqqqqqpqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqzllls8a5w6u
    Value: 0
    GasLimit: 60000000
    Data: "unPause" +
          "@" + <token identifier in hexadecimal encoding>
}

These two operations require that the option canPause is set to true.

Freezing and Unfreezing

The manager of an ESDT token may freeze the tokens held by a specific Account. As a consequence, no tokens may be transferred to or from the frozen Account. Freezing and unfreezing the tokens of an Account are operations designed to help token managers to comply with regulations. The transaction that freezes the tokens of an Account has the form:

FreezeTransaction {
    Sender: <account address of the token manager>
    Receiver: erd1qqqqqqqqqqqqqqqpqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqzllls8a5w6u
    Value: 0
    GasLimit: 60000000
    Data: "freeze" +
          "@" + <token identifier in hexadecimal encoding> +
          "@" + <account address to freeze in hexadecimal encoding>
}

The reverse operation, unfreezing, will allow further transfers to and from the Account:

UnfreezeTransaction {
    Sender: <account address of the token manager>
    Receiver: erd1qqqqqqqqqqqqqqqpqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqzllls8a5w6u
    Value: 0
    GasLimit: 60000000
    Data: "unFreeze" +
          "@" + <token identifier in hexadecimal encoding> +
          "@" + <account address to unfreeze in hexadecimal encoding>
}

These two operations require that the option canFreeze is set to true.

Wiping

The manager of an ESDT token may wipe out all the tokens held by a frozen Account. This operation is similar to burning the tokens, but the Account must have been frozen beforehand, and it must be done by the token manager. Wiping the tokens of an Account is an operation designed to help token managers to comply with regulations. Such a transaction has the form:

WipeTransaction {
    Sender: <account address of the token managers>
    Receiver: erd1qqqqqqqqqqqqqqqpqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqzllls8a5w6u
    Value: 0
    GasLimit: 60000000
    Data: "wipe" +
          "@" + <token identifier in hexadecimal encoding> +
          "@" + <account address to wipe in hexadecimal encoding>
}

Setting and unsetting special roles

The manager of an ESDT token can set and unset special roles for a given address. Only applicable if canAddSpecialRoles property is true. The special roles available for basic ESDT tokens are:

  • ESDTRoleLocalBurn: an address with this role can burn tokens

  • ESDTRoleLocalMint: an address with this role can mint new tokens

For NFTs, there are different roles that can be set. You can find them here.

Set special role

One or more roles for an address can be set by the owner by performing a transaction like:

RolesAssigningTransaction {
    Sender: <address of the ESDT manager>
    Receiver: erd1qqqqqqqqqqqqqqqpqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqzllls8a5w6u
    Value: 0
    GasLimit: 60000000
    Data: "setSpecialRole" +
          "@" + <token identifier in hexadecimal encoding> +
          "@" + <address to assign the role(s) in a hexadecimal encoding> +
          "@" + <role in hexadecimal encoding> +
          "@" + <role in hexadecimal encoding> +
          ...
}

Unset special role

One or more roles for an address can be unset by the owner by performing a transaction like:

RolesAssigningTransaction {
    Sender: <address of the ESDT manager>
    Receiver: erd1qqqqqqqqqqqqqqqpqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqzllls8a5w6u
    Value: 0
    GasLimit: 60000000
    Data: "unSetSpecialRole" +
          "@" + <token identifier in hexadecimal encoding> +
          "@" + <address to unset the role(s) in a hexadecimal encoding> +
          "@" + <role in hexadecimal encoding> +
          "@" + <role in hexadecimal encoding> +
          ...
}

Transferring token management rights

The manager of an ESDT token may transfer the management rights to another Account. This can be done with a transaction of the form:

TransferOwnershipTransaction {
    Sender: <account address of the token manager>
    Receiver: erd1qqqqqqqqqqqqqqqpqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqzllls8a5w6u
    Value: 0
    GasLimit: 60000000
    Data: "transferOwnership" +
          "@" + <token identifier in hexadecimal encoding> +
          "@" + <account address of the new token manager in hexadecimal encoding>
}

After this transaction is processed by the Metachain, any subsequent management operations will only be permitted to the new Account, as specified by the Data field of the transaction.

This operation requires that the option canChangeOwner is set to true.

Upgrading (changing properties)

tip

On Mainnet, starting with epoch 432, global mint and global burn are disabled so one has to use local mint/burn instead.

Therefore, properties canMint and canBurn aren't effective anymore after that epoch. For setting those properties, one has to set the ESDTRoleLocalMint and/or ESDTRoleLocalBurn instead.

The manager of an ESDT token may individually change any of the properties of the token, or multiple properties at once. Such an operation is performed by a transaction of the form:

UpgradingTransaction {
    Sender: <account address of the token manager>
    Receiver: erd1qqqqqqqqqqqqqqqpqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqzllls8a5w6u
    Value: 0
    GasLimit: 60000000
    Data: "controlChanges" +
          "@" + <token identifier in hexadecimal encoding> +
          "@" + <property name in hexadecimal encoding> +
          "@" + <"true" or "false" in hexadecimal encoding> +
          "@" + <property name in hexadecimal encoding> +
          "@" + <"true" or "false" in hexadecimal encoding> +
          <...>
}

As an example, assume that the "AliceTokens" discussed in earlier sections has the property canWipe set to true and the property canBurn set to false, but Alice, the token manager, wants to change these properties to false and true, respectively. The transaction that would achieve this change is:

UpgradingTransaction {
    Sender: erd1sg4u62lzvgkeu4grnlwn7h2s92rqf8a64z48pl9c7us37ajv9u8qj9w8xg
    Receiver: erd1qqqqqqqqqqqqqqqpqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqzllls8a5w6u
    Value: 0
    GasLimit: 60000000
    Data: "controlChanges" +
          "@414c432d363235386432" + # ALC-6258d2
          "@63616e57697065" +       # canWipe
          "@66616c7365" +           # false
          "@63616e4275726e" +       # canBurn
          "@74727565"               # true
}

Branding

Anyone can create an ESDT token on Elrond Network. There are also no limits in tokens names or tickers. For example, one issues an AliceToken with the ticker ALC. Anyone else is free to create a new token with the same token name and the same token ticker. The only difference will be the random sequence of the token identifier. So the "original" token could have received the random sequence 1q2w3e resulting in the ALC-1q2w3e identifier, while the second token could have received the sequence 3e4r5t resulting in ALC-3e4r5t.

In order to differentiate between an original token and other tokens with the same name or ticker, we have introduced a branding mechanism that allows tokens owners to provide a logo, a description, a website, as well as social link for their tokens. An example of a branded token is MEX, the Maiar Exchange's token. Elrond products such as Explorer, Wallet and so on will display tokens in accordance to their branding, if any.

A token owner can submit a branding request by opening a Pull Request on https://github.com/ElrondNetwork/assets.

Submitting a branding request

Project owners can create a PR against https://github.com/ElrondNetwork/assets repository with the logo in .png and .svg format, as well as a .json file containing all the relevant information.

Here’s a prefilled template for the .json file to get you started:

{
  "website": "https://www.elrondtoken.com",
  "description": "The ERD token is the utility token of Elrond Token",
  "social": {
    "email": "[email protected]",
    "blog": "https://www.elrondtoken.com/ERD-token-blog",
    "twitter": "https://twitter.com/ERD-token-twitter",
    "whitepaper": "https://www.elrondtoken.com/ERD-token-whitepaper.pdf",
    "coinmarketcap": "https://coinmarketcap.com/currencies/ERD-token",
    "coingecko": "https://www.coingecko.com/en/coins/ERD-token"
  },
  "status": "active"
}

The ledgerSignature will be generated by Elrond. It will give your token “whitelist” status on the Ledger app and enable a more data rich flow for users storing your token on their Ledger hardware wallets. If one wants to set a Ledger signature, request it when opening a PR.

REST API

There are a number of API endpoints that one can use to interact with ESDT data. These are:

GET Get all ESDT tokens for an address

Returns an array of ESDT Tokens that the specified address has interacted with (issued, sent or received).

https://gateway.elrond.com/address/*bech32Address*/esdt
ParamRequiredTypeDescription
bech32AddressREQUIREDstringThe Address to query in bech32 format.
 
{
  "data": {
    "tokens": [
      "ABC-0d0060",
      "DEF-d00600"
    ]
  },
  "error": "",
  "code": "successful"
}

GET Get balance for an address and an ESDT token

Returns the balance of an address for specific ESDT Tokens.

https://gateway.elrond.com/address/*bech32Address*/esdt/*tokenIdentifier*
ParamRequiredTypeDescription
bech32AddressREQUIREDstringThe Address to query in bech32 format.
tokenIdentifierREQUIREDstringThe token identifier.
 
{
  "data": {
    "tokenData": {
      "balance": "99502603",
      "properties": "",
      "tokenIdentifier": "GLD-0d0060"
    }
  },
  "error": "",
  "code": "successful"
}

GET Get all roles for tokens of an address

This involves a basic request that contains the address to fetch all tokens and roles for. For example:

https://gateway.elrond.com/address/*bech32Address*/esdts/roles
{
  "data": {
    "roles": {
      "TCK-0cv5hj": [
        "ESDTRoleNFTAddQuantity",
        "ESDTRoleNFTBurn"
      ],
      "TCK-ft90kn": [
        "ESDTRoleLocalBurn"
       ] 
    }
  },
  "error": "",
  "code": "successful"
}

GET Get token's supply, burnt and minted values

This involves a basic request that contains the token name. It will gather data from all shards and compute the initial minted value, burnt value, minted value and total supply value.

ParamRequiredTypeDescription
tokenIdentifierREQUIREDstringThe token identifier (example: WEGLD-bd4d79)
 
https://gateway.elrond.com/network/esdt/supply/*token name*
{
 "data": {
  "supply": "95000000000000000000",
  "minted": "5000000000000000000",
  "burned": "10000000000000000000",
  "initialMinted": "100000000000000000000"
 },
 "error": "",
 "code": "successful"
}

GET Get all issued ESDT tokens

  1. All ESDT tokens

For example:

https://gateway.elrond.com/network/esdts
{
  "data": {
    "tokens": [
      "token1",
      "token2",
      ...
    ],
  "error": "",
  "code": "successful"
}
  1. Fungible tokens
https://gateway.elrond.com/network/esdt/fungible-tokens
{
  "data": {
    "tokens": [
      "token1",
      "token2",
      ...
    ],
  "error": "",
  "code": "successful"
}
  1. Semi-fungible tokens
https://gateway.elrond.com/network/esdt/semi-fungible-tokens
{
  "data": {
    "tokens": [
      "token1",
      "token2",
      ...
    ],
  "error": "",
  "code": "successful"
}
  1. Non-fungible tokens
https://gateway.elrond.com/network/esdt/non-fungible-tokens
{
  "data": {
    "tokens": [
      "token1",
      "token2",
      ...
    ],
  "error": "",
  "code": "successful"
}

GET Parse fungible tokens transfer logs

Each successful ESDT transfer generates logs and events that can be used to parse all the details about a transfer (token identifier, sent amount and receiver). In order to get the logs and events generated by the transfer, one should know the transaction's hash.

ParamRequiredTypeDescription
txHashREQUIREDstringThe hash of the transaction
 
https://gateway.elrond.com/transaction/*txHash*?withResults=true
{
 "data": {
  "transaction": {
   ...
   "logs": {
    "address": "...",
    "events": [
     {
      "address": "...",
      "identifier": "ESDTTransfer",
      "topics": [
       "TUVYLTQ1NWM1Nw==",                              // MEX-455c57
       "",                                              // N/A
       "CKxyMEiegAAA",                                  // 160000000000000000000
       "givNK+JiLZ5VA5/dP11QKoYEn7qoqnD8uPchH3ZMLw4="   // erd1sg4u62lzvgkeu4grnlwn7h2s92rqf8a64z48pl9c7us37ajv9u8qj9w8xg
      ],
      "data": null
     },
   }
 }
 "error": "",
 "code": "successful"
}

The event with the identifier ESDTTransfer will have the following topics:

  • 1st topic: token identifier (decoding: base64 to string)
  • 2nd topic: token nonce (used for NFTs only, not applicable here)
  • 3rd topic: the amount to be sent (decoding: base64 to hex string + hex string to big number)
  • 4th topic: the recipient of the tokens (decoding: base64 to hex string + hex string to bech32 address)

In this example, erd1sg4u62lzvgkeu4grnlwn7h2s92rqf8a64z48pl9c7us37ajv9u8qj9w8xg received 160 MEX-455c57 (MEX-455c57 has 18 decimals)

POST Get ESDT token properties

This involves a vm query request to the ESDT address. For example:

https://gateway.elrond.com/vm-values/query
{
    "scAddress": "erd1qqqqqqqqqqqqqqqpqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqzllls8a5w6u",
    "funcName": "getTokenProperties",
    "args": ["474c442d306430303630"]
}

The argument must be the token identifier, hexadecimal encoded. In the example, 474c442d306430303630 = GLD-0d0060.

{
  "data": {
    "data": {
      "returnData": [
        "QWxpY2VUb2tlbnM=",
        "RnVuZ2libGVFU0RU",
        "2DSJxJNAmou8TU9f4WQo7rpyJ822eZVUQYwnabJM5hk=",
        "MTAwMDAwMDAwMDA=",
        "MA==",
        "TnVtRGVjaW1hbHMtNg==",
        "SXNQYXVzZWQtZmFsc2U=",
        "Q2FuVXBncmFkZS10cnVl",
        "Q2FuTWludC10cnVl",
        "Q2FuQnVybi10cnVl",
        "Q2FuQ2hhbmdlT3duZXItZmFsc2U=",
        "Q2FuUGF1c2UtdHJ1ZQ==",
        "Q2FuRnJlZXplLXRydWU=",
        "Q2FuV2lwZS10cnVl",
        "Q2FuQWRkU3BlY2lhbFJvbGVzLXRydWU=",
        "Q2FuVHJhbnNmZXJORlRDcmVhdGVSb2xlLWZhbHNl",
        "TkZUQ3JlYXRlU3RvcHBlZC1mYWxzZQ==",
        "TnVtV2lwZWQtMA=="
      ],
      "returnCode": "ok",
      "returnMessage": "",
      "gasRemaining": 18446744073659551615,
      "gasRefund": 0,
      "outputAccounts": {
        "000000000000000000010000000000000000000000000000000000000002ffff": {
          "address": "erd1qqqqqqqqqqqqqqqpqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqzllls8a5w6u",
          "nonce": 0,
          "balance": null,
          "balanceDelta": 0,
          "storageUpdates": {},
          "code": null,
          "codeMetaData": null,
          "outputTransfers": [],
          "callType": 0
        }
      },
      "deletedAccounts": null,
      "touchedAccounts": null,
      "logs": []
    }
  },
  "error": "",
  "code": "successful"
}

The returnData member will contain an array of the properties in a fixed order (base64 encoded). For the example response, the meaning is:

"returnData": [
  "QWxpY2VUb2tlbnM=",                             | token name                   | AliceTokens
  "RnVuZ2libGVFU0RU",                             | token type                   | FungibleESDT
  "2DSJxJNAmou8TU9f4WQo7rpyJ822eZVUQYwnabJM5hk=", | bytes of a bech32 addres     | erd1mq6gn3yngzdgh0zdfa07zepga6a8yf7dkeue24zp3snknvjvucvs37hmrq after decoding
  "MTAwMDAwMDAwMDA=",                             | total supply                 | 10000000000
  "MA==",                                         | burnt value                  | 0
  "TnVtRGVjaW1hbHMtNg==",                         | number of decimals           | NumDecimals-6
  "SXNQYXVzZWQtZmFsc2U=",                         | is paused                    | IsPaused-false
  "Q2FuVXBncmFkZS10cnVl",                         | can upgrade                  | CanUpgrade-true
  "Q2FuTWludC10cnVl",                             | can mint                     | CanMint-true
  "Q2FuQnVybi10cnVl",                             | can burn                     | CanBurn-true
  "Q2FuQ2hhbmdlT3duZXItZmFsc2U=",                 | can change token management address  | CanChangeOwner-true
  "Q2FuUGF1c2UtdHJ1ZQ==",                         | can pause                    | CanPause-true
  "Q2FuRnJlZXplLXRydWU=",                         | can freeze                   | CanFreeze-true
  "Q2FuV2lwZS10cnVl",                             | can wipe                     | CanWipe-true
  "Q2FuQWRkU3BlY2lhbFJvbGVzLXRydWU=",             | can add special roles        | CanAddSpecialRoles-true
  "Q2FuVHJhbnNmZXJORlRDcmVhdGVSb2xlLWZhbHNl",     | can transfer nft create role | CanTransferNFTCreateRole-false
  "TkZUQ3JlYXRlU3RvcHBlZC1mYWxzZQ==",             | nft creation stopped         | NFTCreateStopped-false  
  "TnVtV2lwZWQtMA=="                              | number of wiped quantity     | NumWiped-0                              
],

POST Get special roles for a token

This involves a vm query request to the ESDT address. It will return all addresses that have roles assigned for the token with the provided identifier. For example:

https://gateway.elrond.com/vm-values/query
{
    "scAddress": "erd1qqqqqqqqqqqqqqqpqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqzllls8a5w6u",
    "funcName": "getSpecialRoles",
    "args": ["474c442d306430303630"]
}

The argument must be the token identifier, hexadecimal encoded. In the example, 474c442d306430303630 = GLD-0d0060.

{
  "data": {
    "data": {
      "returnData": [
        "ZXJkMTM2cmw4NzhqMDltZXYyNGd6cHk3MGsyd2ZtM3htdmo1dWN3eGZmczl2NXQ1c2sza3NodHN6ejI1ejk6RVNEVFJvbGVMb2NhbEJ1cm4=",
        "ZXJkMWt6enYydXc5N3E1azltdDQ1OHFrM3E5dTNjd2h3cXlrdnlrNTk4cTJmNnd3eDdndnJkOXM4a3N6eGs6RVNEVFJvbGVORlRBZGRRdWFudGl0eSxFU0RUUm9sZU5GVEJ1cm4="
      ],
      "returnCode": "ok",
      ........
}

In this example, converting the 2 messages from base64 to string would result in:

  • erd136rl878j09mev24gzpy70k2wfm3xmvj5ucwxffs9v5t5sk3kshtszz25z9:ESDTRoleLocalBurn
  • erd1kzzv2uw97q5k9mt458qk3q9u3cwhwqykvyk598q2f6wwx7gvrd9s8kszxk:ESDTRoleNFTAddQuantity,ESDTRoleNFTBurn
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