Swap Tokens

Swap Tokens

To exchange one token for another, use the swapTokens() method. This method swaps the token with the contract address specified in the inputToken parameter for the token with the contract address specified in the outputToken parameter at the current market price.

Additionally, this method relays the transaction and covers the gas fees for the user, so they don't need to worry about those fees.

The method requires a TradeRequest parameter with the following properties:

Parameter	Type	Description
inputToken	address	The contract address of the token to be swapped.
outputToken	address	The contract address of the token to swap for.
inputAmount	number	The amount of the input token to be traded.
exactIn	boolean	Determines the type of trade (exact input or exact output).

To ensure your transfer request is successful, subscribe to the transactionStarted, transactionHash, transactionSucceeded, and transactionFailed events of the FuseWalletSDK instance. This will allow you to monitor the transaction as it progresses through the network and handle any errors that may occur.

Web

const nativeTokenAddress = "0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE";
const usdcTokenAddress = "0x28C3d1cD466Ba22f6cae51b1a4692a831696391A";
const res = await fuseSDK.swapTokens(
  new TradeRequest(
    nativeTokenAddress,
    usdcTokenAddress,
    parseUnits('1', 18),
    true,
  ),
);

console.log(`UserOpHash: ${res?.userOpHash}`);
console.log("Waiting for transaction...");
const ev = await res?.wait();
console.log(
  `Transaction hash: https://explorer.fuse.io/tx/${ev?.transactionHash}`
);

Flutter

final nativeTokenAddress = "0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE";
final usdcTokenAddress = "0x28C3d1cD466Ba22f6cae51b1a4692a831696391A";

final res = await fuseSDK.swapTokens(
  TradeRequest(
    inputToken: nativeTokenAddress,
    outputToken: usdcTokenAddress,
    inputAmount: BigInt.parse('100000000000000000'),
    exactIn: true,
  ),
);

print('UserOpHash: ${res.userOpHash}');

print('Waiting for transaction...');
final ev = await res.wait();
print('Transaction hash: ${ev?.transactionHash}');