For an overview of transfer fees head over to: GMP Transfer Fees

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Estimating Fees

To estimate both fees, use estimateTransferRemoteFees: 
const { interchainQuote, localQuote } =
  await warpCore.estimateTransferRemoteFees({
    originToken,
    destination,
    sender,
  });
  • interchainQuote: Fee to route the message to the destination chain (via IGP)
  • localQuote: Gas cost to send the tx on the origin chain
Each is returned as a TokenAmount which includes:
  • amount: The quantity of tokens required
  • token: The token metadata (including chain, decimals, and symbol)

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Using the Fee in Transfers

When making a transfer, you can provide the pre-computed fee quote: 
const txs = await warpCore.getTransferRemoteTxs({
  originTokenAmount,
  destination,
  sender,
  recipient,
});
Important Considerations:
  • Fees may vary between different chain types
  • Some chains require additional parameters
  • Missing or underpaying fees will cause the transaction to revert
  • Fee tokens may differ from the transfer token

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How It Works

Under the hood, the SDK uses Mailbox.quoteDispatch() to compute the interchain fee. This is the same value that must be passed to dispatch.