I've been playing around with cardano-serialization-lib and building different types of transactions with TransactionBuilder. However, when I calculate fee and change using add_change_if_needed(addr) for a transaction, that interacts with a plutus script (in my case - the alwayssucceeds script, deployed on Testnet), I get the FeeTooSmallUtxo error, when submitting the transaction via Yoroi or Typhon wallet. At the same time, Nami wallet submits the tx without a problem. I am very confused as to why it is so.

Can anybody help me figure this out?

Here is a code snippet from a function that builds a transaction to send ADA to the contract address:


let txBody = txBuilder.build();
let txHash = CardanoWasm.hash_transaction(txBody);

let witnesses = CardanoWasm.TransactionWitnessSet.new();
let transaction = CardanoWasm.Transaction.new(txBody, witnesses, undefined);

let witnessCBOR = await walletconnected.signTx(buf2hex(transaction.to_bytes()), true);
witnesses = CardanoWasm.TransactionWitnessSet.from_bytes(hex2buf(witnessCBOR));

transaction = CardanoWasm.Transaction.new(txBody, witnesses, undefined);
let trHash = await walletconnected.submitTx(buf2hex(transaction.to_bytes()));

And here is the error I get from Yoroi:

transaction submit error ShelleyTxValidationError ShelleyBasedEraBabbage 
(ApplyTxError [UtxowFailure (UtxoFailure (FromAlonzoUtxoFail 
(FeeTooSmallUTxO (Coin 174125) (Coin 169901))))])

1 Answer 1


This could be related to the underlying version of cardano-node to which the transaction is being submitted. There was a recent bug on Testnet which looks to be related: https://github.com/input-output-hk/cardano-node/issues/4236

So this might not be related to your own code.

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