> ## Documentation Index
> Fetch the complete documentation index at: https://docs.utexo.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Approve for Permit2

> Grant the Permit2 contract sufficient ERC-20 allowance before submitting a signed intent approval.

## Overview

Before submitting an off-chain Permit2 signature, grant the Permit2 contract sufficient allowance on the source ERC-20 token. The on-chain allowance transaction is separate from the signed approval submitted to the Utexo API.

```ts theme={null}
import { ethers } from "ethers";

const ERC20_ABI = [
  "function approve(address spender, uint256 value) external returns (bool)",
];

async function approvePermit2(
  tokenAddress: string,
  permit2Address: string,
  signer: ethers.Signer,
): Promise<ethers.TransactionReceipt> {
  const token = new ethers.Contract(tokenAddress, ERC20_ABI, signer);
  const transaction = await token.approve(permit2Address, ethers.MaxUint256);
  const receipt = await transaction.wait();

  if (!receipt) {
    throw new Error("The Permit2 approval transaction did not produce a receipt");
  }

  return receipt;
}
```

Check the existing allowance before submitting a new approval transaction and wait for confirmation before signing the Permit2 payload.