Getting balance changes from a transfer dry run

[singhparshant]

I want to see balance changes (including the gas fees) for a transfer request. From the docs of dryRun method - The dryRun method should be used to dry-run a contract call.
How can i get the balance changes for transfer requests ?

[dapkns]

Hi dear,
as you can see there is no option for that in fuel wallet at the moment

[dapkns]

2. But in the fulet wallet you can see it saying it is coming soon.
   
   

Therefore we can see this feature future in this network !

[singhparshant]

@dapkns Thanks for the reply.
But we do have a method called dry run in the typescript sdk right ?

FuelLabs/fuels-ts/blob/e165e37307d65deda99f675723ea26470bf807d8/packages/account/src/providers/provider.ts#L973

Can’t we use this to get the balance changes ?

[Torres-ssf]

@singhparshant To get the estimated balance difference from a contract call

// the maxFee (Big Number) here will be the estimated balance to be deducted. 
const { maxFee } = await contract.functions.xyz().getTransactionCost()

For a simple transfer with the base asset ID:

const transferAmount = 1000;

const transactionRequest = await myWallet.createTransfer(
  receiverWallet.address,
  transferAmount,
  baseAssetId,
);

const { maxFee } = await provider.getTransactionCost(transactionRequest)

// When the transfer amount is from the base asset ID, the transfer amount should be part of the calculation
const estimatedBalanceToBeDeducted: BN = maxFee.add(transferAmount)

However, this is just an estimation. This happens because the VM calculates the fee using the gas price which is a value that fluctuates and it can change on every new block.