Mint Tokens

Mints TIP-20 tokens to an address. Requires the ISSUER role. Learn more about roles

Usage

import { client } from './viem.config'
 
const { receipt } = await client.token.mintSync({
  amount: { formatted: '10.5' },
  to: '0x742d35Cc6634C0532925a3b844Bc9e7595f0bEbb',
  token: '0x20c0000000000000000000000000000000000000',
})
 
console.log('Transaction hash:', receipt.transactionHash)
Transaction hash: 0x1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef

import { Account, Client } from 'viem/tempo'
 
export const client = Client.create({
  account: Account.fromSecp256k1('0x...'),
})

Undeclared Tokens

Formatted amounts resolve decimals from the Client's declared tokens (the pathUSD address above is declared on the default token set). For a token not declared on the Client, include amount.decimals so the formatted amount can be parsed.

import { client } from './viem.config'
 
const { receipt } = await client.token.mintSync({
  amount: { decimals: 6, formatted: '10.5' },
  to: '0x742d35Cc6634C0532925a3b844Bc9e7595f0bEbb',
  token: '0x20c0000000000000000000000000000000000001',
})

import { Account, Client } from 'viem/tempo'
 
export const client = Client.create({
  account: Account.fromSecp256k1('0x...'),
})

Base Amounts

Pass a bigint to use the token's base unit amount directly.

import { client } from './viem.config'
 
const { receipt } = await client.token.mintSync({
  amount: 10500000n,
  to: '0x742d35Cc6634C0532925a3b844Bc9e7595f0bEbb',
  token: '0x20c0000000000000000000000000000000000000',
})

import { Account, Client } from 'viem/tempo'
 
export const client = Client.create({
  account: Account.fromSecp256k1('0x...'),
})

Asynchronous Usage

The examples above use a *Sync variant of the action, that will wait for the transaction to be included before returning.

If you are optimizing for performance, you should use the non-sync token.mint action and wait for inclusion manually:

import { Actions } from 'viem/tempo'
import { client } from './viem.config'
 
const hash = await client.token.mint({
  amount: { formatted: '10.5' },
  to: '0x742d35Cc6634C0532925a3b844Bc9e7595f0bEbb',
  token: '0x20c0000000000000000000000000000000000000',
})
const receipt = await client.transaction.waitForReceipt({ hash }).receipt
 
const { args } = Actions.token.mint.extractEvent(receipt.logs)

Recipes

Reconcile Fiat Deposits with a Mint Memo

Pass memo to tag each mint with the fiat deposit reference it backs (for example, deposit_8421 hex-encoded), so onchain issuance reconciles against your banking records.

import { client } from './viem.config'
 
const { receipt } = await client.token.mintSync({
  amount: { formatted: '1000' },
  memo: '0x6465706f7369745f38343231',
  to: '0x742d35Cc6634C0532925a3b844Bc9e7595f0bEbb',
  token: '0x20c0000000000000000000000000000000000000',
})

import { Account, Client } from 'viem/tempo'
 
export const client = Client.create({
  account: Account.fromSecp256k1('0x...'),
})

Guard Large Mints Against the Supply Cap

Combine token.getMetadata with token.mintSync to reject a mint that would exceed the token's supply cap before submitting a transaction that reverts.

import { client } from './viem.config'
 
const amount = 250_000_000_000n
const token = '0x20c0000000000000000000000000000000000000'
 
const { supplyCap, totalSupply } = await client.token.getMetadata({ token })
if (supplyCap && totalSupply + amount > supplyCap)
  throw new Error('mint would exceed the supply cap')
 
const { receipt } = await client.token.mintSync({
  amount,
  to: '0x742d35Cc6634C0532925a3b844Bc9e7595f0bEbb',
  token,
})

import { Account, Client } from 'viem/tempo'
 
export const client = Client.create({
  account: Account.fromSecp256k1('0x...'),
})

Return Value

type ReturnType = {
  /** Address that received the minted tokens. */
  to: Address
  /** Minted amount, in base units. */
  amount: bigint
  /** Token decimals used to derive `formatted`, if known. */
  decimals?: number | undefined
  /** Minted amount formatted with the token's `decimals`, if known. */
  formatted?: string | undefined
  /** Transaction receipt. */
  receipt: TransactionReceipt
}

Parameters

amount

• Type: bigint | { decimals?: number, formatted: string }

Amount of tokens to mint, in base units or formatted decimal form. Include amount.decimals when the token is not declared on the Client's tokens.

memo

• Type: Hex

Memo to include in the mint.

to

• Type: Address

Address to mint tokens to.

token

• Type: Address | bigint

Token to operate on: a TIP-20 token id or a contract address.

account (optional)

• Type: Account | Address

Account that will be used to send the transaction.

feePayer (optional)

• Type: Account | boolean

Fee payer for the transaction (TIP-1 gas sponsorship).

Pass true to defer the fee token to an external fee payer (e.g. a relay), or a local Account to co-sign the transaction as the fee payer.

feeToken (optional)

• Type: Address | bigint

Fee token for the transaction.

Can be an unpaused USD-denominated TIP-20 token address or ID.

gas (optional)

• Type: bigint

Gas limit for the transaction.

keyAuthorization (optional)

• Type: KeyAuthorization

Signed key authorization to include with the transaction, authorizing an access key to act for the sending account.

maxFeePerGas (optional)

• Type: bigint

Max fee per gas for the transaction.

maxPriorityFeePerGas (optional)

• Type: bigint

Max priority fee per gas for the transaction.

nonce (optional)

• Type: number

Nonce for the transaction.

nonceKey (optional)

• Type: 'expiring' | 'random' | bigint

Nonce key for the transaction (TIP-1009 2D nonces).

Use 'expiring' to select an expiring nonce, which enables concurrent transaction submission without nonce ordering. Use 'random' to select a random key.

throwOnReceiptRevert (optional)

• Type: boolean
• Default: true

Whether a Sync action throws when the receipt reports a revert.

validAfter (optional)

• Type: number

Unix timestamp after which the transaction can be included.

validBefore (optional)

• Type: number

Unix timestamp before which the transaction must be included.