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You can choose what asset to use as a fee token (i.e., to cover gas and bridging fees): 
const transaction = await rhinestoneAccount.prepareTransaction({
  sourceChains: [base],
  targetChain: arbitrum,
  calls: [
    // …
  ],
  tokenRequests: [
    // …
  ],
  feeAsset: 'USDC',
})