> ## 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.

# Wrap Native Tokens

> Wrap native blockchain assets into token contracts before Utexo Swap execution.

## Overview

Utexo Swap interacts with token contracts rather than native blockchain assets. Wrap the native asset before execution—for example, wrap ETH into WETH on Ethereum—and use the wrapped-token contract address as `sourceToken`.

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

const WETH_ABI = ["function deposit() external payable"];

async function wrapNative(
  wrappedTokenAddress: string,
  amount: bigint,
  signer: ethers.Signer,
): Promise<ethers.TransactionReceipt> {
  const wrappedToken = new ethers.Contract(
    wrappedTokenAddress,
    WETH_ABI,
    signer,
  );

  const transaction = await wrappedToken.deposit({ value: amount });
  const receipt = await transaction.wait();

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

  return receipt;
}
```

Confirm the wrapped-token contract address for the selected network. The wrapping transaction requires enough native currency for both the wrapped amount and network fees.