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token.approve

Approves a spender to transfer TIP-20 tokens on behalf of the caller.

Usage

example.ts
import { parseUnits } from 'viem'
import { client } from './viem.config'
 
const { receipt } = await client.token.approveSync({
  amount: parseUnits('10.5', 6),
  spender: '0x742d35Cc6634C0532925a3b844Bc9e7595f0bEbb',
  token: '0x20c0000000000000000000000000000000000000',
})
 
console.log('Transaction hash:', receipt.transactionHash)

Transaction hash: 0x1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef

Asynchronous Usage

The example above uses 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.approve action and wait for inclusion manually:

import { Actions } from 'tempo.ts/viem'
import { parseUnits } from 'viem'
import { client } from './viem.config'
 
const hash = await client.token.approve({
  amount: parseUnits('10.5', 6),
  spender: '0x742d35Cc6634C0532925a3b844Bc9e7595f0bEbb',
  token: '0x20c0000000000000000000000000000000000000',
})
const receipt = await client.waitForTransactionReceipt({ hash })
 
const { args } 
  = Actions.token.approve.extractEvent(receipt.logs)

Return Type

type ReturnType = {
  /** Address of the token owner */
  owner: Address
  /** Address of the spender */
  spender: Address
  /** Amount of tokens approved */
  amount: bigint
  /** Transaction receipt */
  receipt: TransactionReceipt
}

Parameters

amount

  • Type: bigint

Amount of tokens to approve.

spender

  • Type: Address

Address of the spender.

token

  • Type: Address | bigint

Address or ID of the TIP-20 token.

account (optional)

  • Type: Account | Address

Account that will be used to send the transaction.

feeToken (optional)

  • Type: Address | bigint

Fee token for the transaction.

Can be a TIP-20 token address or ID.

feePayer (optional)

  • Type: Account | true

Fee payer for the transaction.

Can be a Viem Account, or true if a Fee Payer Service will be used.

gas (optional)

  • Type: bigint

Gas limit for the transaction.

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: 'random' | bigint

Nonce key for the transaction. Use 'random' to generate a random nonce key.

validBefore (optional)

  • Type: number

Unix timestamp before which the transaction must be included.

validAfter (optional)

  • Type: number

Unix timestamp after which the transaction can be included.

throwOnReceiptRevert (optional)

  • Type: boolean
  • Default: true

Whether to throw an error if the transaction receipt indicates a revert. Only applicable to *Sync actions.