How to detect a spent transaction?

[Activaris]

I have many low-value incoming transactions in my wallet. Some have been spent in outgoing transactions, they have no value anymore. Some are unspent, and represent my bitcoin balance.
I want to know the number of incoming transactions with value required for one outgoing transaction in order to estimate the transaction costs.
How can I detect when a transaction has been spent and has become valueless?

Regards!

[Sarzy15]

Try using etherscan to detect your transaction you can also see the worths of your tokens there.

[mocacinno]

I have many low-value incoming transactions in my wallet. Some have been spent in outgoing transactions, they have no value anymore. Some are unspent, and represent my bitcoin balance.
I want to know the number of incoming transactions with value required for one outgoing transaction in order to estimate the transaction costs.
How can I detect when a transaction has been spent and has become valueless?

Regards!

Which wallet software are you using? Without knowing this information, it's not really possible to give a conclusive answer to your question.

You can always lookup the receiving addresses generated by your wallet on blockchain.info... However, if you used unspent outputs to create a new transaction, it's possible your wallet generated change addresses, so you might have change addresses you did not manually create, but still belonging to your wallet containing unspent outputs.

[SFR10]

I want to know the number of incoming transactions with value required for one outgoing transaction in order to estimate the transaction costs.
How can I detect when a transaction has been spent and has become valueless?

Use the following format:

https://blockchain.info/unspent?active=TYPE YOUR BITCOIN ADDRESS HERE&format=html

If you don't see the outputs there, then it's spent (valueless according to your words) and at the same time, you can estimate the needed inputs for your "outgoing transaction".
Don't forget to factor in transaction fee as well.
Take note that what "mocacinno" mentioned earlier still applies:

it's possible your wallet generated change addresses, so you might have change addresses you did not manually create, but still belonging to your wallet containing unspent outputs.