bitcoind json-rpc can do it, I think I saw this on blockchain.info but I don't see it now.


getmempoolentry does it. However this is restricted to txes currently in mempool.

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  • well, I was hoping there is online tool, where I can paste tx hash and see if my client who is sending coins to me actually can do bump fee, before asking him to do so – Pavel Niedoba Apr 30 at 21:41

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