fix(api): estimating transaction fees when inactive

api/src/feat/transactions/transactions.service.ts

@@ -169,19 +169,29 @@ export class TransactionsService {
  const network = this.networks.get(chain);
  const paymaster = this.paymasters.for(chain);
 
+ const isActive = !!(await network.getCode({ address: asAddress(account) }))?.length;
+
  const getGas = async () =>
  gasInput ??
  (
  await network.estimateFee({
  type: 'eip712',
  account: asAddress(account),
- paymaster,
- paymasterInput: encodePaymasterInput({
- token: feeToken,
- amount: 0n,
- maxAmount: 0n,
- }),
  ...encodeOperations(operations),
+ // Only active accounts can estimate paymaster fees. Inactive accounts use EOA account code and throw 'Unsupported paymaster flow'
+ ...(isActive
+ ? {
+ paymaster,
+ paymasterInput: encodePaymasterInput({
+ token: feeToken,
+ amount: 0n,
+ maxAmount: 0n,
+ }),
+ }
+ : {
+ paymaster: undefined,
+ paymasterInput: undefined,
+ }),
  })
  ).gasLimit;