Can I get the timestamp for a transaction added to mempool?

Question

Can I get the time stamp on when a transaction was added to the mempool and when it was successfully added to a block?

Is there an API to do this?

Answer 1

You cannot get a timestamp for the transaction when it was added to the mempool because transactions do not have a concept of time, only blockNumber. While in the mempool, the transaction's blockNumber parameter is None.

Once a miner has included a transaction into a block, the transaction will update with the appropriate blockNumber that it was included in. That block also has a timestamp associated with it, so you can now get a time that the transaction was included in the blockchain.