InvalidTransactionException: The input UTxOs cannot cover the transaction outputs and tx fee.

[Jcruzsalaverri]

Hi everyone

First of all thanks for this awesome package. Im trying to use Transaction builder in order to submit automatic transactions JIT for the snapshots. Im following the example linked above but when I execute

builder.build_and_sign([psk.to_cbor()], change_address=address)

I get the following error

pycardano.exception.InvalidTransactionException: The input UTxOs cannot cover the transaction outputs and tx fee. 

Here is the complete script Im using:

from pycardano import PaymentSigningKey, PaymentVerificationKey, Address, BlockFrostChainContext, Network
network = Network.MAINNET
context = BlockFrostChainContext("my_blockfrost_project_id", network)

psk = PaymentSigningKey.load("payment.skey")

pvk = PaymentVerificationKey.load("payment.vkey")

svk = StakeVerificationKey.load("stake.vkey")

address = Address(pvk.hash(), svk.hash(), network)

builder = TransactionBuilder(context)

builder.add_input_address(str(address))

builder.add_output(TransactionOutput.from_primitive(["Addres I want to send funds to", 100]))

signed_tx = builder.build_and_sign([psk.to_cbor()], change_address=address)

The input account has enough balance since running

context.utxos(str(address))

outputs

[{'input': {'index': ...h': None}}]
    0: {'input': {'index': 0,
 'transaction_id': TransactionId(hex='some hex value')},
 'output': {'address': address,
 'amount': {'coin': 10000000, 'multi_asset': {}},
 'datum_hash': None}}
    len(): 1

What ever value I use as value for the transaction gets rejected with the same error. Any idea?

[cffls]

Hi @Jcruzsalaverri , could you confirm if there is enough balance in the input address? This usually happens when the balance of the input address is lower than specified output.

[Jcruzsalaverri]

Hi @cffls Thanks for the quick response. As I mentioned above the input address used on

builder.add_input_address(str(address))

is the same as the one I show under

context.utxos(str(address))

That outputs

[{'input': {'index': ...h': None}}]
    0: {'input': {'index': 0,
 'transaction_id': TransactionId(hex='some hex value')},
 'output': {'address': address,
 'amount': {'coin': 10000000, 'multi_asset': {}},
 'datum_hash': None}}
    len(): 1

As far as I understand, i have 10 ADA on "address" since that is the output of context.utxos on that specific address and I'm trying to send out 1,5 ADA just like in the example so:

builder.add_input_address(str(address))
utxos = context.utxos(str(address))
builder.add_input(utxos[0])
builder.add_output(TransactionOutput(Address.from_primitive("output_address"),Value.from_primitive([1500000]))) #1,5 ADA < 10 ADA
context.submit_tx(builder.build_and_sign([psk.to_cbor()], change_address=address).to_cbor())

I receive the following output:

Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "C:\ProgramData\Anaconda3\lib\site-packages\pycardano\txbuilder.py", line 929, in build_and_sign
    tx_body = self.build(change_address=change_address, merge_change=merge_change)
  File "C:\ProgramData\Anaconda3\lib\site-packages\pycardano\txbuilder.py", line 865, in build
    self._add_change_and_fee(change_address, merge_change=merge_change)
  File "C:\ProgramData\Anaconda3\lib\site-packages\pycardano\txbuilder.py", line 422, in _add_change_and_fee
    changes = self._calc_change(
  File "C:\ProgramData\Anaconda3\lib\site-packages\pycardano\txbuilder.py", line 336, in _calc_change
    raise InvalidTransactionException(
pycardano.exception.InvalidTransactionException: The input UTxOs cannot cover the transaction outputs and tx fee. 
Inputs: [{'input': {'index': 0,
 'transaction_id': TransactionId(hex='95b5d314c1548fc0217904ee3bf5497985923f2c6d59c986392f8d68b3a1fe73')},
 'output': {'address': addr1qxdvxvx9m2h6gpcmjfzlm6gg3k4jtdjuuex24e7yzc97hjwecx3x7t7ng30pfwfs5zp0uhur655uwddn5vlh7yd3zc6scseh30,
 'amount': {'coin': 10000000, 'multi_asset': {}},
 'datum_hash': None}}] 
Outputs: [{'address': addr1p92t9n34y66c7vkuq6r2x8l7wn7x5fsafxq3vvnj9ec6u5xecx3x7t7ng32pfwfs5zp0uhur655uwddn5vlh7yd3zc6sxk03gn,
 'amount': {'coin': 1500000, 'multi_asset': {}},
 'datum_hash': None}, {'address': addr1qxdvxvx9m2h6gpcmjfzlm6gg3k4jtdjuuex24e7yzc97hjwecx3x7t7ng30pfwfs5zp0uhur655uwddn5vlh7yd3zc6scseh30,
 'amount': {'coin': 8332123, 'multi_asset': {}},
 'datum_hash': None}] 
fee: 167877

Please correct me if im doing some basic math wrongly but I think 10000000 = 8332123+167877+1500000

[cffls]

Hi @Jcruzsalaverri , could you trying using the latest version of pycardano in main branch? I am able to build this transaction correctly:

builder = TransactionBuilder(context)
builder.add_input_address("addr1qxdvxvx9m2h6gpcmjfzlm6gg3k4jtdjauux24e6yzc87hjwecx3x7t7ng30pfwfs5zp0uhur655uwddn5vlh7yd3zc6scseh30")
builder.add_output(TransactionOutput(Address.from_primitive("addr1q92t9n33y66c7vkuq6r2x8l9wn7x5fsafxq3vvnj93c6u5xecx3x7t7ng30pfwfs5zp0uhur655uwddn5vlh7yd3zc6sxk03gn"),Value.from_primitive([1500000])))
address = Address.from_primitive("addr1qxdvxvx9m2h6gpcmjfzlm6gg3k4jtdjauux24e6yzc87hjwecx3x7t7ng30pfwfs5zp0uhur655uwddn5vlh7yd3zc6scseh30")
tx_body = builder.build(change_address=address)
tx_body
{
  'auxiliary_data_hash': None,
  'certificates': None,
  'collateral': None,
  'collateral_return': None,
  'fee': 167877,
  'inputs': [
    {
      'index': 0,
      'transaction_id': TransactionId(hex='c7202e3c4a2c17a245eab0a053c9ade03aa90887b422aa6b9f9719f8886c3d94'),
    },
  ],
  'mint': None,
  'network_id': None,
  'outputs': [
    {
      'address': addr1q92t9n33y66c7vkuq6r2x8l9wn7x5fsafxq3vvnj93c6u5xecx3x7t7ng30pfwfs5zp0uhur655uwddn5vlh7yd3zc6sxk03gn,
      'amount': {'coin': 1500000, 'multi_asset': {}},
      'datum': None,
      'datum_hash': None,
      'script': None,
    },
    {
      'address': addr1qxdvxvx9m2h6gpcmjfzlm6gg3k4jtdjauux24e6yzc87hjwecx3x7t7ng30pfwfs5zp0uhur655uwddn5vlh7yd3zc6scseh30,
      'amount': {'coin': 8332123, 'multi_asset': {}},
      'datum': None,
      'datum_hash': None,
      'script': None,
    },
  ],
  'reference_inputs': None,
  'required_signers': None,
  'script_data_hash': None,
  'total_collateral': None,
  'ttl': None,
  'update': None,
  'validity_start': None,
  'withdraws': None,
}

[Jcruzsalaverri]

Thanks @cffls It worked seamlessly. Thanks again for this awesome package and all the features it brings to Python users I hope to be able to make some contribution in the future! Also thanks for the awesome and quick answer.

[mateusap1]

TransactionOutput.from_primitive(["Addres I want to send funds to", 100])

This looks weird to me. Are you trying to send only 100 lovelace to that address?

[Jcruzsalaverri]

I also tried with different values like

builder.add_output(TransactionOutput(Address.from_primitive("output_address"),Value.from_primitive([1500000]))) #1,5 ADA < 10 ADA

But still got the same output

Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "C:\ProgramData\Anaconda3\lib\site-packages\pycardano\txbuilder.py", line 929, in build_and_sign
    tx_body = self.build(change_address=change_address, merge_change=merge_change)
  File "C:\ProgramData\Anaconda3\lib\site-packages\pycardano\txbuilder.py", line 865, in build
    self._add_change_and_fee(change_address, merge_change=merge_change)
  File "C:\ProgramData\Anaconda3\lib\site-packages\pycardano\txbuilder.py", line 422, in _add_change_and_fee
    changes = self._calc_change(
  File "C:\ProgramData\Anaconda3\lib\site-packages\pycardano\txbuilder.py", line 336, in _calc_change
    raise InvalidTransactionException(
pycardano.exception.InvalidTransactionException: The input UTxOs cannot cover the transaction outputs and tx fee. 
Inputs: [{'input': {'index': 0,
 'transaction_id': TransactionId(hex='95b5d314c1548fc0217904ee3bf5497985923f2c6d59c986392f8d68b3a1fe73')},
 'output': {'address': addr1qxdvxvx9m2h6gpcmjfzlm6gg3k4jtdjuuex24e7yzc97hjwecx3x7t7ng30pfwfs5zp0uhur655uwddn5vlh7yd3zc6scseh30,
 'amount': {'coin': 10000000, 'multi_asset': {}},
 'datum_hash': None}}] 
Outputs: [{'address': addr1p92t9n34y66c7vkuq6r2x8l7wn7x5fsafxq3vvnj9ec6u5xecx3x7t7ng32pfwfs5zp0uhur655uwddn5vlh7yd3zc6sxk03gn,
 'amount': {'coin': 1500000, 'multi_asset': {}},
 'datum_hash': None}, {'address': addr1qxdvxvx9m2h6gpcmjfzlm6gg3k4jtdjuuex24e7yzc97hjwecx3x7t7ng30pfwfs5zp0uhur655uwddn5vlh7yd3zc6scseh30,
 'amount': {'coin': 8332123, 'multi_asset': {}},
 'datum_hash': None}] 
fee: 167877